Surface Electrochemical Modification of a Nickel Substrate to Prepare a NiFe-based Electrode for Water Oxidation

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• 作者：Dingyi Guo ; Jing Qi ; Prof. Wei Zhang and Prof. Rui Cao
• 刊名：ChemSusChem
• 出版年：2017
• 出版时间：January 20, 2017
• 年：2017
• 卷：10
• 期：2
• 页码：394-400
• 全文大小：1412K
• ISSN：1864-564X

文摘

The slow kinetics of water oxidation greatly jeopardizes the efficiency of water electrolysis for H₂ production. Developing highly active water oxidation electrodes with affordable fabrication costs is thus of great importance. Herein, a Ni^IIFe^III surface species on Ni metal substrate was generated by electrochemical modification of Ni in a ferrous solution by a fast, simple, and cost-effective procedure. In the prepared Ni^IIFe^III catalyst film, Fe^III was incorporated uniformly through controlled oxidation of Fe^II cations on the electrode surface. The catalytically active Ni^II originated from the Ni foam substrate, which ensured the close contact between the catalyst and the support toward improved charge-transfer efficiency. The as-prepared electrode exhibited high activity and long-term stability for electrocatalytic water oxidation. The overpotentials required to reach water oxidation current densities of 50, 100, and 500 mA cm⁻² are 276, 290, and 329 mV, respectively.