Fluorination-enabled Reconstruction of NiFe Electrocatalysts for Efficient Water Oxidation,Nano Letters

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Fluorination-enabled Reconstruction of NiFe Electrocatalysts for Efficient Water Oxidation
Nano Letters ( IF 9.6 ) Pub Date : 2020-12-01 , DOI: 10.1021/acs.nanolett.0c03950
Qiucheng Xu ₁ , Hao Jiang _{1,

2} , Xuezhi Duan ₂ , Zheng Jiang ₃ , Yanjie Hu ₁ , Shannon W. Boettcher ₄ , Weiyu Zhang ₅ , Shaojun Guo ₅ , Chunzhong Li _{1,

2}

Affiliation

Developing low-cost and efficient electrocatalysts to accelerate oxygen evolution reaction (OER) kinetics is vital for water and carbon-dioxide electrolyzers. The fastest-known water oxidation catalyst, Ni(Fe)O_xH_y, usually produced through an electrochemical reconstruction of precatalysts under alkaline condition, has received substantial attention. However, the reconstruction in the reported catalysts usually leads to a limited active layer and poorly controlled Fe-activated sites. Here, we demonstrate a new electrochemistry-driven F-enabled surface-reconstruction strategy for converting the ultrathin NiFeO_xF_y nanosheets into an Fe-enriched Ni(Fe)O_xH_y phase. The activated electrocatalyst shows a low OER overpotential of 218 ± 5 mV at 10 mA cm^–2 and a low Tafel slope of 31 ± 4 mV dec^–1, which is among the best for NiFe-based OER electrocatalysts. Such superior performance is caused by the effective formation of the Fe-enriched Ni(Fe)O_xH_y active-phase that is identified by operando Raman spectroscopy and the substantially improved surface wettability and gas-bubble-releasing behavior.

中文翻译：

氟化活化的NiFe电催化剂的高效水氧化

开发低成本高效的电催化剂来加速氧气析出反应（OER）动力学对水和二氧化碳电解槽至关重要。已知最快的水氧化催化剂Ni（Fe）O _x H _y通常是通过在碱性条件下对预催化剂进行电化学重建而制备的，已经引起了广泛的关注。然而，所报道的催化剂中的重构通常导致有限的活性层和不良控制的Fe活化位点。在这里，我们展示了一种新的由电化学驱动的F驱动的表面重建策略，该策略可将超薄的NiFeO _x F _y纳米片转变为富铁的Ni（Fe）O _x H _y相。活化的电催化剂在10 mA cm ^–2时显示出218±5 mV的低OER过电势，在31±4 mV dec ^–1的低Tafel斜率，是基于NiFe的OER电催化剂中最好的。这种优越的性能是由有效形成的Fe-富集镍（FE）O引起的_X ħ _ý活性相是由识别operando拉曼光谱和显着改善的表面润湿性和气体气泡放出行为。

更新日期：2021-01-13

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