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A highly-efficient oxygen evolution electrode based on defective nickel-iron layered double hydroxide 被引量:9
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作者 Xuya Xiong Zhao Cai +10 位作者 Daojin Zhou Guoxin Zhang Qian Zhang Yin Jia Xinxuan Duan Qixian Xie shibin lai Tianhui Xie Yaping Li Xiaoming Sun Xue Duan 《Science China Materials》 SCIE EI CSCD 2018年第7期939-947,共9页
Exploring efficient and cost-effective electro- catalysts for oxygen evolution reaction (OER) is critical to water splitting. While nickel-iron layered double hydroxide (NiFe LDH) has been long recognized as a pro... Exploring efficient and cost-effective electro- catalysts for oxygen evolution reaction (OER) is critical to water splitting. While nickel-iron layered double hydroxide (NiFe LDH) has been long recognized as a promising non- precious electrocatalyst for OER, its intrinsic activity needs further improvement. Herein, we design a highly-efficient oxygen evolution electrode based on defective NiFe LDH na- noarray. By combing the merits of the modulated electronic structure, more exposed active sites, and the conductive elec- trode, the defective NiFe LDH electrocatalysts show a low onset potential of 1.40 V (vs. RHE). An overpotential of only 200 mV is required for 10 mA cm-2, which is 48 mV lower than that of pristine NiFe-LDH. Density functional theory plus U (DFT+U) calculations are further employed for the origin of this OER activity enhancement. We find the introduction of oxygen vacancies leads to a lower valance state of Fe and the narrowed bandgap, which means the electrons tend to be ea- sily excited into the conduction band, resulting in the lowered reaction overpotential and enhanced OER performance. 展开更多
关键词 oxygen evolution reaction layered double hydroxide oxygen vacancy ELECTROCATALYSIS
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