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Nickel iron carbonate hydroxide hydrate decorated with CeO x for highly efficient oxygen evolution reaction
Journal of Solid State Electrochemistry ( IF 2.5 ) Pub Date : 2019-11-23 , DOI: 10.1007/s10008-019-04445-9
Jinhua Cai , Jiangen Huang , Shichen Xu , Ling Yuan , Xueren Huang , Zhipeng Huang , Chi Zhang

Highly active, durable, and inexpensive nanostructured catalysts are crucial for achieving efficiently and economically electrochemical water splitting. In recent years, the introduction of cerium (Ce) into electrocatalysts is an effective way to improve the performance of oxygen evolution reaction (OER). Herein, we report a cerium oxide deposited nickel iron carbonate hydroxide hydrate (NiFeCH(Ce)) on the carbon fiber paper through two-step hydrothermal/electrodeposition approach. The NiFeCH(Ce) not only exhibits a remarkably improved OER performance with an overpotential of 252 mV at a current density of 100 mA cm−2, but also possesses a small Tafel slope of 59 mV dec−1, the both values superior to the most non-noblemetal-based OER electrocatalysts reported. X-ray photoelectron spectroscopy analysis shows that the super OER electrocatalysis performance of the NiFeCH(Ce) was related intensely with the introduction of Ce ions, which not only richer surface defects and higher oxygen adsorption capacity, but also provide more effective charge and mass transfer between intermediates and catalysts, making a great contribution to the OER enhancement.

中文翻译:

CeO x修饰的氢氧化镍碳酸铁镍水合物,用于高效放氧反应

高活性,耐用和廉价的纳米结构催化剂对于实现高效和经济的电化学水分解至关重要。近年来,将铈(Ce)引入电催化剂是提高氧析出反应(OER)性能的有效途径。本文中,我们通过两步水热/电沉积方法在碳纤维纸上报告了氧化铈沉积的氢氧化镍碳酸氢铁镍水合物(NiFeCH(Ce))。NiFeCH(Ce)不仅具有显着改善的OER性能,在100 mA cm -2的电流密度下具有252 mV的过电势,而且具有59 mV dec -1的小Tafel斜率,这两个值均优于报道的大多数非贵金属基OER电催化剂。X射线光电子能谱分析表明,NiFeCH(Ce)的超级OER电催化性能与Ce离子的引入密切相关,Ce离子不仅具有更丰富的表面缺陷和更高的氧吸附能力,而且还提供了更有效的电荷和质量转移在中间体和催化剂之间,为提高OER做出了巨大贡献。
更新日期:2019-12-11
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