Multiple structural defects in ultrathin NiFe-LDH nanosheets synergistically and remarkably boost water oxidation reaction
Multiple structural defects in ultrathin NiFe-LDH nanosheets synergistically and remarkably boost water oxidation reaction
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超薄 NiFe-LDH 纳米片中的多个结构缺陷协同并显着促进水氧化反应
DOI:
10.1007/s12274-021-3475-z
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发表时间:
2021-06
期刊:
影响因子:
9.9
通讯作者:
Jian-Ping Lang
中科院分区:
文献类型:
--
作者:
Zhong-Ying Zhao;Qi Shao;Jiang-Yan Xue;Bo-Long Huang;Zheng Niu;Hong-Wei Gu;Xiao-Qing Huang;Jian-Ping Lang
Modifying electrocatalysts nanostructures and tuning their electronic properties through defects-oriented synthetic strategies are essential to improve the oxygen evolution reaction (OER) performance of electrocatalysts. Current synthetic strategies about electrocatalysts mainly target the single or double structural defects, while the researches about the synergistic effect of multiple structural defects are rare. In this work, the ultrathin NiFe layered double hydroxide nanosheets with a holey structure, oxygen vacancies and Ni3+defects on nickel foam (NiFe-LDH-NSs/NF) are prepared by employing a simple and green H2O2-assisted etching method. The synergistic effect of the above three defects leads to the exposure of more active sites and significant improvement of the intrinsic activity. The optimized catalyst exhibits an excellent OER performance with an extraordinarily low overpotential of 170 mV at 10 mA·cm−2and a small Tafel slope of 39.3 mV·dec−1in 1 M KOH solution. Density functional theory calculations reveal this OER performance arises from pseudo re-oxidized metal-stable Ni3+near oxygen vacancies (Ovac), which suppresses 3d-egof Ni-site and elevates d-band center towards the competitively low electron-transfer barrier. This work provides a new insight to fabricate advanced electrocatalysts for renewable energy conversion technologies.
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