A facile method to synthesize 3D nanosheets of Fe/S doped α-Ni(OH)2 as an electrocatalyst for improved oxygen evolution reaction

Yuanyuan Chu; Xiaoxiao Zhang; Bohan Deng; Kuixiao Wang; Xiaoyao Tan

doi:10.1088/1361-6528/ac5aeb

A facile method to synthesize 3D nanosheets of Fe/S doped α-Ni(OH)2 as an electrocatalyst for improved oxygen evolution reaction

Nanotechnology. 2022 Jul 15;33(40). doi: 10.1088/1361-6528/ac5aeb.

Authors

Yuanyuan Chu^{1

2}, Xiaoxiao Zhang^{1

2}, Bohan Deng^{1

2}, Kuixiao Wang^{1

2}, Xiaoyao Tan^{1

2}

Affiliations

¹ State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, No. 399 Binshui West Road, Tianjin 300387, People's Republic of China.
² School of Chemistry and Chemical Engineering, Tiangong University, No. 399 Binshui West Road, Tianjin 300387, People's Republic of China.

PMID: 35245913
DOI: 10.1088/1361-6528/ac5aeb

Abstract

S-doped Fe/Ni oxide and Fe/Ni hydride oxide catalysts exhibit good oxygen evolution reaction (OER) performance. Nevertheless, the over-doping of S and the agglomeration of active sites still hinder the improvement of the performance of these catalysts. The S/O ratio regulation can optimize the electronic structure effectively so as to improve the OER performance of the catalysts, but few studies have focused on this study. Here, we find a facile room-temperature method to synthesize the unique 3D ultra-thin FeNiOS nanosheets with an adjustable S/O ratio for OER. The FeNiOS-NS catalysts exhibit excellent OER performance with an overpotential of 235 mV at 10 mA cm^-2and a small Tafel slope of 64.2 mV dec^-1in 0.1 M KOH, which originated from the sufficient exposure of the active Fe-Ni component and the optimized electronic structure due to the tunable S/O ratio. This study demonstrates a novel strategy to optimize the OER performance of Ni-based catalysts.

Keywords: FeNiOS-NS; S/O anions ratio; oxygen evolution reaction; α-Ni(OH)2.