A novel silver oxides oxygen evolving catalyst for water splitting

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• 作者：Wei Wang^a ; Qiang Zhao^a ; Jinxiang Dong^a ; Jinping Li ; ^a ; ^{jpli211@hotmail.com"" rel=""nofollow}
• 关键词：Electrochemistry ; Oxygen evolving catalyst ; Silver oxides ; Water splitting ; Energy storage
• 刊名：International Journal of Hydrogen Energy
• 出版年：2011
• 出版时间：July 2011
• 年：2011
• 卷：36
• 期：13
• 页码：7374-7380
• 全文大小：1086 K

文摘

A novel silver oxides oxygen evolving catalyst (Ag-OEC) for hydrogen production by water splitting was formed in situ on an indium tin oxide anode, in a near-neutral potassium tetraborate (K₂B₄O₇) electrolyte. The catalyst exhibited high activity and low overpotential for O₂ evolution under mild conditions. The main functional composition of the catalyst was a redox couple of Ag₂O/AgO. Catalytic activity during oxygen evolution was evaluated by cyclic voltammetry and Tafel plot. The effects of the concentration, temperature, and pH of K₂B₄O₇ solution on the catalyst, and the Faradaic efficiency of the oxygen evolving reaction were examined. The results show that the Ag-OEC exhibits excellent oxygen evolution properties, with an oxygen evolving overpotential of 318 mV at a current density of 1 mA/cm².