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Promoting Oxygen Evolution Reactions through Introduction of Oxygen Vacancies to Benchmark NiFe–OOH Catalysts
ACS Energy Letters ( IF 22.0 ) Pub Date : 2018-05-30 00:00:00 , DOI: 10.1021/acsenergylett.8b00696
Majid Asnavandi 1 , Yichun Yin 2 , Yibing Li 1 , Chenghua Sun 3 , Chuan Zhao 1
Affiliation  

Advanced electrocatalysts toward oxygen evolution reaction (OER) at high current density with low overpotential remain a significant challenge for electrochemical water splitting. Herein, NiFe-based catalysts with appropriate electronic conductivity and catalytic activity have been obtained through introduction of oxygen vacancies by a facile and economic NaBH4 reduction approach. The combined density functional theory calculations, physical characterization, and electrochemical studies disclose that the reductive treatment creates a high amount of oxygen vacancies, high active sites, and a low energy barrier for OER. The oxygen vacancy-rich catalyst yields a more than 2-fold increased current density (from 100 to 240 mA cm–2) at a low overpotential of 270 mV, accompanied by good stability under OER conditions. The approach is also broadly applicable for NiFe compounds synthesized via different methods or substrates.

中文翻译:

通过引入氧空位作为基准NiFe–OOH催化剂来促进氧释放反应

在高电流密度和低超电势下,用于氧析出反应(OER)的高级电催化剂仍然是电化学水分解的重大挑战。在此,通过以简便且经济的NaBH 4还原方法引入氧空位,已经获得了具有适当的电导率和催化活性的NiFe基催化剂。结合的密度泛函理论计算,物理表征和电化学研究表明,还原处理会产生大量的氧空位,较高的活性位点和较低的OER能垒。富氧空位的催化剂产生的电流密度增加了两倍以上(从100到240 mA cm –2)在270 mV的低过电势下,在OER条件下具有良好的稳定性。该方法还广泛适用于通过不同方法或基材合成的NiFe化合物。
更新日期:2018-05-30
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