Journal
NANO ENERGY
Volume 89, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106463
Keywords
Oxygen evolution reaction; Doping; Nanoplatelets; Au-Fe7S8
Categories
Funding
- Australian Research Council (ARC) Future Fellowship Scheme [FT210100509]
- National Natural Science Foundation of China [51675322]
- Research Grants Council of Hong Kong [9048121]
- City University of Hong Kong [SRG 7005460]
- Shenzhen Science Technology and Innovation Commission [R-IND12302]
- Curtin strategic international research scholarship (CSIRS)
- Chinese Academy of Sciences (CAS) Hundred Talents Program
- Australian Research Council LIEF [LE120100026]
- Australian Research Council [FT210100509] Funding Source: Australian Research Council
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The ion diffusion-induced doping strategy was used to develop Ni2+/Co2+ doped Au-Fe7S8 nanoplatelets with exceptional OER activity, outperforming the benchmark RuO2 catalyst. The co-existence of Co and Ni led to the lowest OER overpotential and fast kinetics for the nanoplatelets, as demonstrated by density functional theory (DFT) calculations.
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.
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