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Science China Materials

, Volume 61, Issue 7, pp 939–947 | Cite as

A highly-efficient oxygen evolution electrode based on defective nickel-iron layered double hydroxide

  • Xuya Xiong (熊旭亚)
  • Zhao Cai (蔡钊)
  • Daojin Zhou (周道金)
  • Guoxin Zhang (张国新)
  • Qian Zhang (张倩)
  • Yin Jia (贾茵)
  • Xinxuan Duan (段欣旋)
  • Qixian Xie (谢启贤)
  • Shibin Lai (赖仕斌)
  • Tianhui Xie (谢添慧)
  • Yaping Li (李亚平)
  • Xiaoming Sun (孙晓明)
  • Xue Duan (段雪)
Articles
  • 159 Downloads

Abstract

Exploring efficient and cost-effective electrocatalysts 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 nanoarray. By combing the merits of the modulated electronic structure, more exposed active sites, and the conductive electrode, 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 easily excited into the conduction band, resulting in the lowered reaction overpotential and enhanced OER performance.

Keywords

oxygen evolution reaction layered double hydroxide oxygen vacancy electrocatalysis 

基于富缺陷镍铁水滑石材料的高效析氧电极

摘要

探索低成本高效率的析氧电极对于工业电解水技术的发展至关重要. 尽管镍铁水滑石已被公认为是一种高效析氧的非贵金属催化剂, 但其本征活性还有待进一步提高. 本研究通过将氧空位缺陷引入镍铁水滑石, 设计出一种低成本高效率的析氧电极. 通过精确电子结构调控, 暴露更多活性位点, 提高电极导电性, 富缺陷镍铁水滑石电极展现出1.40 V (vs. RHE)的低起峰电位. 同时, 它仅需200 mV过电势就能达到10 mA cm−2的电流密度, 这相比未经处理的镍铁水滑石降低了48 mV. 我们进一步通过密度泛函理论计算发现, 氧空位缺陷的引入使Fe的价态降低, 带隙减小, 使得催化过程中电子更容易被激发到导带中, 从而降低反应过电势并使析氧活性增强.

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China, National Key Research and Development Project (2016YFC0801302, 2016YFF0204402), the Program for Changjiang Scholars and Innovative Research Team in the University, and the Fundamental Research Funds for the Central Universities, and the longterm subsidy mechanism from the Ministry of Finance and the Ministry of Education of China.

Supplementary material

40843_2017_9214_MOESM1_ESM.pdf (3.7 mb)
A highly-efficient oxygen evolution electrode based on defective nickel-iron layered double hydroxide

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Xuya Xiong (熊旭亚)
    • 1
  • Zhao Cai (蔡钊)
    • 1
    • 2
  • Daojin Zhou (周道金)
    • 1
  • Guoxin Zhang (张国新)
    • 3
  • Qian Zhang (张倩)
    • 1
  • Yin Jia (贾茵)
    • 1
    • 4
  • Xinxuan Duan (段欣旋)
    • 1
  • Qixian Xie (谢启贤)
    • 1
  • Shibin Lai (赖仕斌)
    • 1
  • Tianhui Xie (谢添慧)
    • 1
  • Yaping Li (李亚平)
    • 1
  • Xiaoming Sun (孙晓明)
    • 1
    • 4
  • Xue Duan (段雪)
    • 1
  1. 1.State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijingChina
  2. 2.Department of Chemistry and Energy Sciences InstituteYale UniversityWest HavenUSA
  3. 3.College of Electrical Engineering and AutomationShandong University of Science and TechnologyTsingtaoChina
  4. 4.College of Energy, Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijingChina

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