From Water Oxidation to Reduction: Transformation from NixCo3–xO4 Nanowires to NiCo/NiCoOx Heterostructures

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• 作者：Xiaodong Yan ; KeXue Li ; Lu Lyu ; Fang Song ; Jun He ; Dongmei Niu ; Lei Liu ; Xile Hu ; Xiaobo Chen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：February 10, 2016
• 年：2016
• 卷：8
• 期：5
• 页码：3208-3214
• 全文大小：451K
• ISSN：1944-8252

文摘

A homologous Ni–Co based nanowire catalyst pair, composed of Ni_xCo_3–xO₄ nanowires and NiCo/NiCoO_x nanohybrid, is developed for efficient overall water splitting. Ni_xCo_3–xO₄ nanowires are found as a highly active oxygen evolution reaction (OER) catalyst, and they are converted into a highly active hydrogen evolution reaction (HER) catalyst through hydrogenation treatment as NiCo/NiCoO_x heteronanostructures. An OER current density of 10 mA cm^–2 is obtained with the Ni_xCo_3–xO₄ nanowires under an overpotential of 337 mV in 1.0 M KOH, and an HER current density of 10 mA cm^–2 is obtained with the NiCo/NiCoO_x heteronanostructures at an overpotential of 155 mV. When integrated in an electrolyzer, these catalysts demonstrate a stable performance in water splitting.