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Cathodic Corrosion of Metal Electrodes—How to Prevent It in Electroorganic Synthesis

“…The beneficial effect of the latter was assigned to the reduction of ZnO to Zn. Oxygen also has detrimental effects on cathodes in acidic media at low negative potentials and, for example, cathodes such as Ag and Cu − can corrode to some extent. With Cu cathodes, the initial rate of dissolution was high, but later the produced metal cations started to electrodeposit back onto the cathode and the corrosion reached a steady state. , However, this type of corrosion could have important consequences when these cathode materials are used in flow cells and the solution is not deareated.…”

“…Oxygen also has detrimental effects on cathodes in acidic media at low negative potentials and, for example, cathodes such as Ag and Cu − can corrode to some extent. With Cu cathodes, the initial rate of dissolution was high, but later the produced metal cations started to electrodeposit back onto the cathode and the corrosion reached a steady state. , However, this type of corrosion could have important consequences when these cathode materials are used in flow cells and the solution is not deareated. There, the electrodeposition could be effectively inhibited, and, in addition, this type of corrosion-redeposit process could affect the Faradaic efficiency as well.…”

Real‐time Monitoring Reveals Dissolution/Redeposition Mechanism in Copper Nanocatalysts during the Initial Stages of the CO2 Reduction Reaction

“…[32,34,40] As imilar process of anomalous dissolution of Cu under cathodic polarization in acidic media has been studied and its chemical conjugation to oxygen reduction reaction was suggested as an explanation. [41,42] Another possibility is the migration of negatively charged transient Cu À species in awater depletion layer close to the electrode surface;aprocess referred to as cathodic corrosion. [43] This process was observed on Pt electrodes at potentials as high as À0.5 Vvs.…”

Растворение Меди В Персульфатных Средахпри Катодных Потенциалах

“…В этих условиях скорость их окисления обычно невелика, часто она даже не зависит от самого катодного потенциала. Такое явление получило название «химического растворения», «аномального растворения» или «растворения при катодных потенциалах» [1][2][3][4][5][6][7].…”

“…В иной ситуации, при стадийном восстановлении окислителя, образующем высокоактивные промежуточные ионы или свободные радикалы, возможна передача части энергии поверхностным атомам металла Me S . Такое химическое сопряжение создает возможность для ионизации атомов металла и в катодной области потенциалов [2][3][4][5][6][7]. (2) Между связанными реакциями (1) и (2) происходит перераспределение электрохимической энергии, что вызывает кажущиеся отклонения от термодинамических законов [13].…”