Amorphous nickel-iron oxides/carbon nanohybrids for an efficient and durable oxygen evolution reaction

被引:0
作者
Bo Li
Shuangming Chen
Jie Tian
Ming Gong
Hangxun Xu
Li Song
机构
[1] University of Science and Technology of China,CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering
[2] University of Science and Technology of China,National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience
[3] University of Science and Technology of China,Engineering and Materials Science Experiment Center
来源
Nano Research | 2017年 / 10卷
关键词
amorphous metal oxides; electrocatalysis; oxygen evolution reaction; sonochemistry; X-ray absorption near edge structure;
D O I
暂无
中图分类号
学科分类号
摘要
Highly efficient and durable water oxidation electrocatalysts are critically important in a wide range of clean energy technologies, including water electrolyzers and rechargeable metal-air batteries. Here, we report a novel sonochemical approach to synthesize amorphous nickel-iron oxides/carbon nanohybrids with tunable compositions for the oxygen evolution reaction (OER). The sonochemically synthesized amorphous electrocatalysts with optimal composition exhibit a low overpotential of 290 mV at 10 mA·cm−2 and a Tafel slope of 31 mV·decade−1 in a 0.1 M KOH electrolyte, outperforming the benchmark RuO2 catalyst. Meanwhile, these nanohybrids are also highly stable and remain amorphous even after prolonged cycling. In addition to amorphism, sonochemistry endows as-prepared nickel-iron oxides/carbon nanohybrids with a simultaneously formed carbon scaffold and internal Ni(0), which can enhance the stability and activity for the OER. This work demonstrates that sonochemistry is a unique method for synthesizing amorphous metal oxides toward an efficient and durable OER.
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页码:3629 / 3637
页数:8
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