Amorphous NiFeB nanoparticles realizing highly active and stable oxygen evolving reaction for water splitting
Amorphous NiFeB nanoparticles realizing highly active and stable oxygen evolving reaction for water splitting
复制标题
非晶态NiFeB纳米粒子实现高活性和稳定的分解水析氧反应
DOI：
10.1007/s12274-017-1783-0
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发表时间：
2018-03-01
期刊：
影响因子：
9.9
通讯作者：
Li, Jinping
中科院分区：
文献类型：
--
作者：
Liu, Guang;He, Dongying;Li, Jinping
开发高效廉价的析氧反应催化剂对提高水裂解反应的整体效率具有重要意义。本文报道了一种简单的化学还原法制备了一系列不同Fe/（Ni + Fe）（χFe）原子比的非晶态NiFeB纳米粒子。非晶态NiFeB（χFe= 0.20）纳米粒子结合了原位形成的富含硼酸盐的NiFeOOH催化表面层、固有的非晶态纳米结构和优化的Fe掺杂程度的优点，在宽的pH值范围内（从碱性到中性条件）对OER显示出高活性的电催化性能。在10 mA/cm 2的1 M KOH溶液中，该催化剂在泡沫镍上的过电位为216 mV，Tafel斜率为40 mV/dec，在玻碳上的过电位为251 mV，Tafel斜率为43 mV/dec，表明其OER效率比商业RuO 2高得多。通过计时电流法（过电位（η）= 320 mV）对NiFeB（χFe= 0.20）的OER性能进行超过200小时的长期稳定性测试，没有发现降解的证据。简单、可规模化的合成和高活性的水氧化使得NiFeB纳米颗粒对于OER电催化非常有吸引力。
The development of highly efficient and inexpensive catalysts for oxygen evolving reactions (OERs) is extremely urgent for promoting the overall efficiency of water splitting. Herein we report the fabrication of a series of amorphous NiFeB nanoparticles with varying atomic ratios of Fe to (Ni + Fe) (χFe) by a facile chemical-reduction method. The amorphous NiFeB (χFe= 0.20) nanoparticles, combining the merits ofin situformation of borate-enriched NiFeOOH catalytic surface layers, intrinsic amorphous nanostructures, and an optimized degree of Fe doping, displayed highly active electrocatalytic performance towards the OER in a broad range of pH values (from alkaline to neutral conditions). The catalyst exhibited a relatively low overpotential of 216 mV with a Tafel slope of 40 mV/dec on Ni foam and 251 mV with a Tafel slope of 43 mV/dec on glassy carbon at 10 mA/cm2in a 1 M KOH solution, demonstrating much greater OER efficiency than that of commercial RuO2. Long-term stability testing of the OER performance of NiFeB (χFe= 0.20) by chronoamperometry (overpotential (η) = 320 mV) over 200 h revealed no evidence of degradation. Facile, scalable synthesis and highly active water oxidation make the NiFeB nanoparticles very attractive for OER electrocatalysis.