Ni2+/Co2+ doped Au-Fe7S8 nanoplatelets with exceptionally high oxygen evolution reaction activity

Javaid, Shaghraf; Xu, Xiaomin; Chen, Wei; Chen, Jiayi; Hsu, H.Y.; Wang, S.; Yang, X.; Li, Y.; Shao, Zongping; Jones, Franca; Jia, Guohua

doi:10.1016/j.nanoen.2021.106463

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Embargo Lift Date

2023-08-27

Authors

Javaid, Shaghraf

Xu, Xiaomin

Chen, Wei

Chen, Jiayi

Hsu, H.Y.

Wang, S.

Yang, X.

Li, Y.

Shao, Zongping

Jones, Franca

Jia, Guohua

Date

2021

Type

Journal Article

Metadata

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Citation

Javaid, S. and Xu, X. and Chen, W. and Chen, J. and Hsu, H.Y. and Wang, S. and Yang, X. et al. 2021. Ni2+/Co2+ doped Au-Fe7S8 nanoplatelets with exceptionally high oxygen evolution reaction activity. Nano Energy. 89: Article No. 106463.

Source Title

Nano Energy

DOI

10.1016/j.nanoen.2021.106463

ISSN

2211-2855

Faculty

Faculty of Science and Engineering

School

WASM: Minerals, Energy and Chemical Engineering

School of Molecular and Life Sciences (MLS)

Abstract

To overcome the limited potency of energy devices such as alkaline water electrolyzers, the construction of active materials with dramatically enhanced oxygen evolution reaction (OER) performance is of great importance. Herein we developed an ion diffusion-induced doping strategy that is capable of producing Ni2+/Co2+ doped two-dimensional (2D) Au-Fe7S8 nanoplatelets (NPLs) with exceptionally high OER activity outperforming the benchmark RuO2 catalyst. The co-existence of Co and Ni in Au-Fe7S8 NPLs led to the lowest OER overpotential of 243 mV at 10 mA cm-2 and fast kinetics with a Tafel slope of 43 mV dec-1. Density functional theory (DFT) calculations demonstrated that Ni2+/Co2+ doping improves the binding of OOH species on the {001} surfaces of Au-Fe7S8 NPLs and lowers the Gibbs free energy of the OER process, which are beneficial to outstanding OER activity of the nanoplatelets.