ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Synthesis of micro-and nano-sized crystalline BaFeO 4 particles by precipitation from the electro... more Synthesis of micro-and nano-sized crystalline BaFeO 4 particles by precipitation from the electrochemically synthesized potassium ferrate(VI) solution by means of barium hydroxide and its encapsulation in paraffin wax were explored using scanning electron microscopy, X-ray diffraction spectroscopy and FTIR spectroscopy. Experimental results showed effective synthesis of the micro-sized and nano-sized BaFeO 4 particles and their coating by the paraffin wax layer. The encapsulated micro-and nano-sized particles of BaFeO 4 were applied in investigating the possibility of degradation of pesticide clomazone in water. The removal of clomazone from water by oxidation using encapsulated BaFeO 4 could be almost 95%.
The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 ... more The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 M KOH electrolytes on a boron-doped diamond electrode was examined by cyclic voltammetry between the potentials of the hydrogen evolution reaction and the oxygen evolution reaction. It was shown that the anodic current peak that appeared in iron-free electrolyte at a less positive potential than the potential of the oxygen evolution probably coincides with oxidation of hydrogen in >CH 2 groups and C-sp 2 graphite impurities with formation of >C=O groups in a C-sp 3 diamond structure. Addition of Fe(III) compounds to the electrolyte provoked the formation of an anodic wave on the cyclic voltammograms in the potential region that correlates with the generation of ferrate(VI). It is concluded that the direct electrochemical synthesis of Fe(VI) at a boron-doped diamond anode is possible because of the less positive potential of ferrate(VI), 2-4 FeO , formation with respect to the potential of the oxygen evolution reaction. The presence of ferrate(VI) in the electrolyte, formed after anodic polarization of the boron electrode in 10 M KOH electrolyte saturated with Fe(III) at 0.9 V against Hg/HgO electrode, was proven by UV-Vis spectrometry.
A possible mechanism of the formation of spongy zinc electrodeposits is considered. The confirmat... more A possible mechanism of the formation of spongy zinc electrodeposits is considered. The confirmation of the proposed semiquantitative mathematical model is performed in zinc electrodeposition onto copper wire from a 0.1 M zincate solution in 1.0 M KOH at room temperature. It was shown by SEM analysis of the deposit that the spongy growth was caused by mass transfer limitations under low nucleation rate conditions. In this situation, amplification of the surface inequalities on the independently growing grains takes place leading to the formation of the spherical agglomerate of filaments, which form a spongy deposit. Also, it was shown that in the case of a square-wave pulsating overpotential regime, the deposits are less agglomerated than the ones obtained in the case of a direct overpotential regime. This effect is more pronounced at a higher pulse-to-pulse ratio. This is explained by dissolution of filaments, based on the mathematical model of pulsating overpotential.
The solid salts of the ferrate anion might offer significant advantages over conventional materia... more The solid salts of the ferrate anion might offer significant advantages over conventional materials used as cathodes because of the three electron transfer associated with the reduction of Fe(VI) to Fe(III). In the present study, we try to improve the performance of the electrochemically synthesized barium ferrate cathode using non-stoichiometric binary titanium oxides: titanium monoxide (TiO x) and Magnèli phases (Ti n O 2n-1) addition performed throughout fabrication of plastic bonded cathode. It is shown that the addition of conductive Magnèli phase materials into active material improves the performance of a cathode in terms of specific capacity, reversibility, and more positive equilibrium potential compared to BaFeO 4 À based cathodes. It is believed that Magnèli phase material enhances connectivity of the active BaFeO 4 material and acts as reinforcement to the active mass thereby aiding retention of feature and porosity during cycling improving the reaction kinetics of the electrode. Also, our preliminary results demonstrate that the porous plastic bonded thin foil electrodes based on electrochemically synthesized barium ferrate can be considered in spiral wound battery geometry for higher rate capability.
The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 ... more The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 M KOH electrolytes on a boron-doped diamond electrode was examined by cyclic voltammetry between the potentials of the hydrogen evolution reaction and the oxygen evolution reaction. It was shown that the anodic current peak that appeared in iron-free electrolyte at a less positive potential than the potential of the oxygen evolution probably coincides with oxidation of hydrogen in >CH 2 groups and C-sp 2 graphite impurities with formation of >C=O groups in a C-sp 3 diamond structure. Addition of Fe(III) compounds to the electrolyte provoked the formation of an anodic wave on the cyclic voltammograms in the potential region that correlates with the generation of ferrate(VI). It is concluded that the direct electrochemical synthesis of Fe(VI) at a boron-doped diamond anode is possible because of the less positive potential of ferrate(VI), 2-4 FeO , formation with respect to the potential of the oxygen evolution reaction. The presence of ferrate(VI) in the electrolyte, formed after anodic polarization of the boron electrode in 10 M KOH electrolyte saturated with Fe(III) at 0.9 V against Hg/HgO electrode, was proven by UV-Vis spectrometry.
... It can be seen that the average equilibrium plateau pressure of 0.035 bar is prominent compar... more ... It can be seen that the average equilibrium plateau pressure of 0.035 bar is prominent compared with LaNi 5 [5 and 15], La 0.9 Zr 0.1 Ni 4.5 Al 0.5 [6], LaNi 4 Cu [15] and in the same order asLaNi 4 Al [15]. ... 9. W. Zhang, A. Visintin, S. Srinivasan, AJ Appleby and HS Lim. ...
Internal corrosion of carbon steel pipelines is a major problem encountered in water service. In ... more Internal corrosion of carbon steel pipelines is a major problem encountered in water service. In terms of prediction of the remaining lifetime for water pipelines based on the corrosion allowance, the three main approaches are corrosion modelling, corrosion inhibitor availability, and corrosion monitoring. In this study we used two theoretical corrosion models, CASSANDRA and NORSOK M-506 of quite different origin in order to predict uniform corrosivity of hot aquifers in eight different pipelines. Because of the varying calculation criteria for the different models, these can give very different corrosion rate predictions for the same data input. This is especially true under conditions where the formation of protective films may occur, such as at elevated temperatures. The evaluation of models was conducted by comparison using weight-loss coupons and three corrosion inhibitors were obtained from commercial suppliers. The tests were performed during the 60-day period. Even though in...
Several samples of oxygen deficient titanium oxides (TiO, Ti4O7, Ti5O9, Ti6O11) or their mixtures... more Several samples of oxygen deficient titanium oxides (TiO, Ti4O7, Ti5O9, Ti6O11) or their mixtures were prepared using mechanochemical procedure followed, in some cases, by thermal treatment. The prepared oxides, mixtures identical or similar to Ebonex powder, and original Ebonex powder have proceeded into plastic–bonded foil electrodes using a low density polyethylene. The electrodes were tested for corrosion stability in real Pb-acid battery conditions and their conductivities were compared. If contact resistance to cathode and anode active mass can be overcome, some investigated samples are very promising for application as current collector in extremely aggressive H2SO4 surrounding.
Silver is a known disinfectant from ancient times, and it has been widely used for various purpos... more Silver is a known disinfectant from ancient times, and it has been widely used for various purposes: for food and water disinfection, curing of wounds and as a universal antibiotic for a wide spectrum of diseases - until the Second World War and the discovery of penicillin. Until recently, it was assumed that silver, being a heavy metal, was toxic for humans and living beings. However, the newest research provides facts that the usage of silver, even for drinking water disinfection, is benign if it is added in small concentrations (in parts per billion). It has been shown in the newer scientific and technical literature that silver in colloidal form is a powerful (secondary) disinfectant for drinking water, that it can be effectively used for the disinfection of water containers including swimming pools, installations in food industry, medicine, etc. Particularly, it has been shown that colloidal silver combined with hydrogen peroxide shows synergism having strong bactericidal and a...
The electrochemical methodologies for synthesis of BaFeO4 and Ag2FeO4 are presented in this artic... more The electrochemical methodologies for synthesis of BaFeO4 and Ag2FeO4 are presented in this article. The first step was to prepare a solution of the K2FeO4 as starting reagent by anodic dissolution in the transpassive potential region of the electrical steel in 10M KOH. The current density applied was fixed at 20 mA/cm2 at 55?C. Solid BaFeO4 and Ag2FeO4 were precipitated from K2FeO4 solution by the addition of Ba(OH)2 8H2O and AgNO3 solutions, respectively. The yield of solid salt synthesized was calculated by the hromitne titration, while their phase composition was determined by XRD analysis. Significant decomposition for BaFeO4 stored in dry conditions was not observed. Solid phase synthesized Ag2FeO4 is less stable than BaFeO4 due to its high sensitivity to light and susceptibility in such conditions to degradation to Ag2O, and AgO.
Mg 2 Ni-type alloys, i.e., Mg 2 Ni, Mg 2 Ni 0.75 Cu 0.25 , Mg 2 Ni 0.6 Cu 0.4 and Mg 2 Ni 0.75 V ... more Mg 2 Ni-type alloys, i.e., Mg 2 Ni, Mg 2 Ni 0.75 Cu 0.25 , Mg 2 Ni 0.6 Cu 0.4 and Mg 2 Ni 0.75 V 0.25 were synthesized by mechanical alloying and subsequent thermal treatment starting from a corresponding elemental powder mixture. The kinetics of hydrogen absorption and desorption of annealed materials were measured using a manually controlled Sieverts apparatus. The electrochemical characteristics of Mg 2 Ni-type alloys were tested for their ability to store hydrogen at room temperature by using constant current to charge and discharge the electrode. The partial substitutions of Cu and V for Ni increased hydrogen absorption and desorption at 200 • C and improved the electrochemical storage capacity and cycle life at room temperature.
Testing of Disinfectants. This agent is exceptionally effective and it is completely biodegradabl... more Testing of Disinfectants. This agent is exceptionally effective and it is completely biodegradable breaking down into water and oxygen. Since it does not contain chlorine, aldehydes nor phenol it is quite acceptable to be applied in the food industry, industry of water and industry of all other agents that are directly related to people. Besides, the effects are far stronger and longer lasting, even at elevated temperatures, than those of other agents available on our market. Our disinfecting agent is even more times effective than H 2 O 2. Apart from the above mentioned bacteria and fungi it also destroys viruses and protozoa. Except from it being an extremely effective disinfectant as described above, the composition of the agent described in this work is completely non-toxic to humans, animals and plants.
ABSTRACT The effect of sulphate and silicate addition in a 10 M KOH electrolyte on the anodic cor... more ABSTRACT The effect of sulphate and silicate addition in a 10 M KOH electrolyte on the anodic corrosion and transpassivity of iron and steel rich in silicon are explored by cyclic and linear sweep voltammetry. Formation of ferrate(VI) in the iron transpassivity region is noticed in all explored electrolytes. The electrochemical sulphato- and silico-ferrate(VI) formation is discussed as a possible result of Fe3III(Si1.32Fe0.68)O5(OH)4 and [Fe(II)4Fe(III)2(OH)12]SO4 oxidation in the 10 M KOH electrolytes with silicate and sulphate, respectively. The presence of Fe3(Si1.32Fe0.68)O5(OH)4 in the anodic layer of silicon steel and the crystal structure of electrochemically synthesised Ba(Fe, S)O4 have been revealed by XRD.
The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 ... more The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 M KOH electrolytes on a boron-doped diamond electrode was examined by cyclic voltammetry between the potentials of the hydrogen evolution reaction and the oxygen evolution reaction. It was shown that the anodic current peak that appeared in iron-free electrolyte at a less positive potential than the potential of the oxygen evolution probably coincides with oxidation of hydrogen in >CH 2 groups and C-sp 2 graphite impurities with formation of >C=O groups in a C-sp 3 diamond structure. Addition of Fe(III) compounds to the electrolyte provoked the formation of an anodic wave on the cyclic voltammograms in the potential region that correlates with the generation of ferrate(VI). It is concluded that the direct electrochemical synthesis of Fe(VI) at a boron-doped diamond anode is possible because of the less positive potential of ferrate(VI), 2-4 FeO , formation with respect to the potential of the oxygen evolution reaction. The presence of ferrate(VI) in the electrolyte, formed after anodic polarization of the boron electrode in 10 M KOH electrolyte saturated with Fe(III) at 0.9 V against Hg/HgO electrode, was proven by UV-Vis spectrometry.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Synthesis of micro-and nano-sized crystalline BaFeO 4 particles by precipitation from the electro... more Synthesis of micro-and nano-sized crystalline BaFeO 4 particles by precipitation from the electrochemically synthesized potassium ferrate(VI) solution by means of barium hydroxide and its encapsulation in paraffin wax were explored using scanning electron microscopy, X-ray diffraction spectroscopy and FTIR spectroscopy. Experimental results showed effective synthesis of the micro-sized and nano-sized BaFeO 4 particles and their coating by the paraffin wax layer. The encapsulated micro-and nano-sized particles of BaFeO 4 were applied in investigating the possibility of degradation of pesticide clomazone in water. The removal of clomazone from water by oxidation using encapsulated BaFeO 4 could be almost 95%.
The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 ... more The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 M KOH electrolytes on a boron-doped diamond electrode was examined by cyclic voltammetry between the potentials of the hydrogen evolution reaction and the oxygen evolution reaction. It was shown that the anodic current peak that appeared in iron-free electrolyte at a less positive potential than the potential of the oxygen evolution probably coincides with oxidation of hydrogen in >CH 2 groups and C-sp 2 graphite impurities with formation of >C=O groups in a C-sp 3 diamond structure. Addition of Fe(III) compounds to the electrolyte provoked the formation of an anodic wave on the cyclic voltammograms in the potential region that correlates with the generation of ferrate(VI). It is concluded that the direct electrochemical synthesis of Fe(VI) at a boron-doped diamond anode is possible because of the less positive potential of ferrate(VI), 2-4 FeO , formation with respect to the potential of the oxygen evolution reaction. The presence of ferrate(VI) in the electrolyte, formed after anodic polarization of the boron electrode in 10 M KOH electrolyte saturated with Fe(III) at 0.9 V against Hg/HgO electrode, was proven by UV-Vis spectrometry.
A possible mechanism of the formation of spongy zinc electrodeposits is considered. The confirmat... more A possible mechanism of the formation of spongy zinc electrodeposits is considered. The confirmation of the proposed semiquantitative mathematical model is performed in zinc electrodeposition onto copper wire from a 0.1 M zincate solution in 1.0 M KOH at room temperature. It was shown by SEM analysis of the deposit that the spongy growth was caused by mass transfer limitations under low nucleation rate conditions. In this situation, amplification of the surface inequalities on the independently growing grains takes place leading to the formation of the spherical agglomerate of filaments, which form a spongy deposit. Also, it was shown that in the case of a square-wave pulsating overpotential regime, the deposits are less agglomerated than the ones obtained in the case of a direct overpotential regime. This effect is more pronounced at a higher pulse-to-pulse ratio. This is explained by dissolution of filaments, based on the mathematical model of pulsating overpotential.
The solid salts of the ferrate anion might offer significant advantages over conventional materia... more The solid salts of the ferrate anion might offer significant advantages over conventional materials used as cathodes because of the three electron transfer associated with the reduction of Fe(VI) to Fe(III). In the present study, we try to improve the performance of the electrochemically synthesized barium ferrate cathode using non-stoichiometric binary titanium oxides: titanium monoxide (TiO x) and Magnèli phases (Ti n O 2n-1) addition performed throughout fabrication of plastic bonded cathode. It is shown that the addition of conductive Magnèli phase materials into active material improves the performance of a cathode in terms of specific capacity, reversibility, and more positive equilibrium potential compared to BaFeO 4 À based cathodes. It is believed that Magnèli phase material enhances connectivity of the active BaFeO 4 material and acts as reinforcement to the active mass thereby aiding retention of feature and porosity during cycling improving the reaction kinetics of the electrode. Also, our preliminary results demonstrate that the porous plastic bonded thin foil electrodes based on electrochemically synthesized barium ferrate can be considered in spiral wound battery geometry for higher rate capability.
The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 ... more The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 M KOH electrolytes on a boron-doped diamond electrode was examined by cyclic voltammetry between the potentials of the hydrogen evolution reaction and the oxygen evolution reaction. It was shown that the anodic current peak that appeared in iron-free electrolyte at a less positive potential than the potential of the oxygen evolution probably coincides with oxidation of hydrogen in >CH 2 groups and C-sp 2 graphite impurities with formation of >C=O groups in a C-sp 3 diamond structure. Addition of Fe(III) compounds to the electrolyte provoked the formation of an anodic wave on the cyclic voltammograms in the potential region that correlates with the generation of ferrate(VI). It is concluded that the direct electrochemical synthesis of Fe(VI) at a boron-doped diamond anode is possible because of the less positive potential of ferrate(VI), 2-4 FeO , formation with respect to the potential of the oxygen evolution reaction. The presence of ferrate(VI) in the electrolyte, formed after anodic polarization of the boron electrode in 10 M KOH electrolyte saturated with Fe(III) at 0.9 V against Hg/HgO electrode, was proven by UV-Vis spectrometry.
... It can be seen that the average equilibrium plateau pressure of 0.035 bar is prominent compar... more ... It can be seen that the average equilibrium plateau pressure of 0.035 bar is prominent compared with LaNi 5 [5 and 15], La 0.9 Zr 0.1 Ni 4.5 Al 0.5 [6], LaNi 4 Cu [15] and in the same order asLaNi 4 Al [15]. ... 9. W. Zhang, A. Visintin, S. Srinivasan, AJ Appleby and HS Lim. ...
Internal corrosion of carbon steel pipelines is a major problem encountered in water service. In ... more Internal corrosion of carbon steel pipelines is a major problem encountered in water service. In terms of prediction of the remaining lifetime for water pipelines based on the corrosion allowance, the three main approaches are corrosion modelling, corrosion inhibitor availability, and corrosion monitoring. In this study we used two theoretical corrosion models, CASSANDRA and NORSOK M-506 of quite different origin in order to predict uniform corrosivity of hot aquifers in eight different pipelines. Because of the varying calculation criteria for the different models, these can give very different corrosion rate predictions for the same data input. This is especially true under conditions where the formation of protective films may occur, such as at elevated temperatures. The evaluation of models was conducted by comparison using weight-loss coupons and three corrosion inhibitors were obtained from commercial suppliers. The tests were performed during the 60-day period. Even though in...
Several samples of oxygen deficient titanium oxides (TiO, Ti4O7, Ti5O9, Ti6O11) or their mixtures... more Several samples of oxygen deficient titanium oxides (TiO, Ti4O7, Ti5O9, Ti6O11) or their mixtures were prepared using mechanochemical procedure followed, in some cases, by thermal treatment. The prepared oxides, mixtures identical or similar to Ebonex powder, and original Ebonex powder have proceeded into plastic–bonded foil electrodes using a low density polyethylene. The electrodes were tested for corrosion stability in real Pb-acid battery conditions and their conductivities were compared. If contact resistance to cathode and anode active mass can be overcome, some investigated samples are very promising for application as current collector in extremely aggressive H2SO4 surrounding.
Silver is a known disinfectant from ancient times, and it has been widely used for various purpos... more Silver is a known disinfectant from ancient times, and it has been widely used for various purposes: for food and water disinfection, curing of wounds and as a universal antibiotic for a wide spectrum of diseases - until the Second World War and the discovery of penicillin. Until recently, it was assumed that silver, being a heavy metal, was toxic for humans and living beings. However, the newest research provides facts that the usage of silver, even for drinking water disinfection, is benign if it is added in small concentrations (in parts per billion). It has been shown in the newer scientific and technical literature that silver in colloidal form is a powerful (secondary) disinfectant for drinking water, that it can be effectively used for the disinfection of water containers including swimming pools, installations in food industry, medicine, etc. Particularly, it has been shown that colloidal silver combined with hydrogen peroxide shows synergism having strong bactericidal and a...
The electrochemical methodologies for synthesis of BaFeO4 and Ag2FeO4 are presented in this artic... more The electrochemical methodologies for synthesis of BaFeO4 and Ag2FeO4 are presented in this article. The first step was to prepare a solution of the K2FeO4 as starting reagent by anodic dissolution in the transpassive potential region of the electrical steel in 10M KOH. The current density applied was fixed at 20 mA/cm2 at 55?C. Solid BaFeO4 and Ag2FeO4 were precipitated from K2FeO4 solution by the addition of Ba(OH)2 8H2O and AgNO3 solutions, respectively. The yield of solid salt synthesized was calculated by the hromitne titration, while their phase composition was determined by XRD analysis. Significant decomposition for BaFeO4 stored in dry conditions was not observed. Solid phase synthesized Ag2FeO4 is less stable than BaFeO4 due to its high sensitivity to light and susceptibility in such conditions to degradation to Ag2O, and AgO.
Mg 2 Ni-type alloys, i.e., Mg 2 Ni, Mg 2 Ni 0.75 Cu 0.25 , Mg 2 Ni 0.6 Cu 0.4 and Mg 2 Ni 0.75 V ... more Mg 2 Ni-type alloys, i.e., Mg 2 Ni, Mg 2 Ni 0.75 Cu 0.25 , Mg 2 Ni 0.6 Cu 0.4 and Mg 2 Ni 0.75 V 0.25 were synthesized by mechanical alloying and subsequent thermal treatment starting from a corresponding elemental powder mixture. The kinetics of hydrogen absorption and desorption of annealed materials were measured using a manually controlled Sieverts apparatus. The electrochemical characteristics of Mg 2 Ni-type alloys were tested for their ability to store hydrogen at room temperature by using constant current to charge and discharge the electrode. The partial substitutions of Cu and V for Ni increased hydrogen absorption and desorption at 200 • C and improved the electrochemical storage capacity and cycle life at room temperature.
Testing of Disinfectants. This agent is exceptionally effective and it is completely biodegradabl... more Testing of Disinfectants. This agent is exceptionally effective and it is completely biodegradable breaking down into water and oxygen. Since it does not contain chlorine, aldehydes nor phenol it is quite acceptable to be applied in the food industry, industry of water and industry of all other agents that are directly related to people. Besides, the effects are far stronger and longer lasting, even at elevated temperatures, than those of other agents available on our market. Our disinfecting agent is even more times effective than H 2 O 2. Apart from the above mentioned bacteria and fungi it also destroys viruses and protozoa. Except from it being an extremely effective disinfectant as described above, the composition of the agent described in this work is completely non-toxic to humans, animals and plants.
ABSTRACT The effect of sulphate and silicate addition in a 10 M KOH electrolyte on the anodic cor... more ABSTRACT The effect of sulphate and silicate addition in a 10 M KOH electrolyte on the anodic corrosion and transpassivity of iron and steel rich in silicon are explored by cyclic and linear sweep voltammetry. Formation of ferrate(VI) in the iron transpassivity region is noticed in all explored electrolytes. The electrochemical sulphato- and silico-ferrate(VI) formation is discussed as a possible result of Fe3III(Si1.32Fe0.68)O5(OH)4 and [Fe(II)4Fe(III)2(OH)12]SO4 oxidation in the 10 M KOH electrolytes with silicate and sulphate, respectively. The presence of Fe3(Si1.32Fe0.68)O5(OH)4 in the anodic layer of silicon steel and the crystal structure of electrochemically synthesised Ba(Fe, S)O4 have been revealed by XRD.
The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 ... more The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 M KOH electrolytes on a boron-doped diamond electrode was examined by cyclic voltammetry between the potentials of the hydrogen evolution reaction and the oxygen evolution reaction. It was shown that the anodic current peak that appeared in iron-free electrolyte at a less positive potential than the potential of the oxygen evolution probably coincides with oxidation of hydrogen in >CH 2 groups and C-sp 2 graphite impurities with formation of >C=O groups in a C-sp 3 diamond structure. Addition of Fe(III) compounds to the electrolyte provoked the formation of an anodic wave on the cyclic voltammograms in the potential region that correlates with the generation of ferrate(VI). It is concluded that the direct electrochemical synthesis of Fe(VI) at a boron-doped diamond anode is possible because of the less positive potential of ferrate(VI), 2-4 FeO , formation with respect to the potential of the oxygen evolution reaction. The presence of ferrate(VI) in the electrolyte, formed after anodic polarization of the boron electrode in 10 M KOH electrolyte saturated with Fe(III) at 0.9 V against Hg/HgO electrode, was proven by UV-Vis spectrometry.
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