Anionic Regulated NiFe (Oxy)Sulfide Electrocatalysts for Water Oxidation
Anionic Regulated NiFe (Oxy)Sulfide Electrocatalysts for Water Oxidation
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DOI：
10.1002/smll.201700610
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发表时间：
2017-07-05
期刊：
影响因子：
13.3
通讯作者：
Zhang, Qiang
中科院分区：
文献类型：
--
作者：
Li, Bo-Quan;Zhang, Shu-Yuan;Zhang, Qiang
构建具有本征析氧反应（OER）的活性位点对于克服燃料电池、可充电金属-空气电池等丰富的可持续能源装置以及水裂解的有限效率具有重要意义。通过调节活性中心的电子结构来调节电催化剂的阴离子，显著地促进了OER性能。为了证明这一概念，NiFeS电催化剂的制备具有逐渐变化的S：O原子比。随着硫含量的增加，水的氧化过电位呈现负离子调节下的火山曲线。优化后的NiFeS-2电催化剂在阴离子调节下具有最低的OER过电位（10 mA cm-2时为286 mV）和最快的动力学（56.3 mV dec-1）。阴离子调控方法不仅是构建优良OER电催化剂的有效策略，而且为从电子和原子水平深入理解电催化提供了新的视角。
The construction of active sites with intrinsic oxygen evolution reaction (OER) is of great significance to overcome the limited efficiency of abundant sustainable energy devices such as fuel cells, rechargeable metal-air batteries, and in water splitting. Anionic regulation of electrocatalysts by modulating the electronic structure of active sites significantly promotes OER performance. To prove the concept, NiFeS electrocatalysts are fabricated with gradual variation of atomic ratio of S:O. With the rise of S content, the overpotential for water oxidation exhibits a volcano plot under anionic regulation. The optimized NiFeS-2 electrocatalyst under anionic regulation possesses the lowest OER overpotential of 286 mV at 10 mA cm(-2) and the fastest kinetics being 56.3 mV dec(-1) to date. The anionic regulation methodology not only serves as an effective strategy to construct superb OER electrocatalysts, but also enlightens a new point of view for the in-depth understanding of electrocatalysis at the electronic and atomic level.