Issue 11, 2019

Hybridizing amorphous NiOx nanoflakes and Mn-doped Ni2P nanosheet arrays for enhanced overall water electrocatalysis

Abstract

Rational development and facile fabrication of efficient and low-cost bifunctional electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) play a vital role in hydrogen and oxygen generation by overall water electrocatalysis. Herein, a series of hierarchical core–shell hybrid nanostructured bifunctional electrocatalysts have been successfully synthesized by electrodepositing amorphous nickel oxide nanoflakes (A-NiOx) on the surface of crystalline Mn-doped Ni2P nanosheet arrays (Mn5-Ni2P). Benefitting from the synergistic effect generated from the outer amorphous NiOx and inner highly crystalline Mn5-Ni2P nanosheets, the optimal A-NiOx-20/Mn5-Ni2P sample exhibits quite low overpotentials for the HER (55 mV) and OER (255 mV) to afford a current density of 10 mA cm−2 in alkaline electrolyte. Moreover, the two-electrode water electrolysis device only requires a small cell voltage of 1.54 V to deliver 10 mA cm−2 and shows no obvious attenuation for 20 hours. Our work will provide a valuable method to design and synthesize efficient electrocatalysts for water splitting and other applications of energy conversion and storage.

Graphical abstract: Hybridizing amorphous NiOx nanoflakes and Mn-doped Ni2P nanosheet arrays for enhanced overall water electrocatalysis

Supplementary files

Article information

Article type
Paper
Submitted
24 Jūn. 2019
Accepted
25 Aug. 2019
First published
26 Aug. 2019

Sustainable Energy Fuels, 2019,3, 3093-3100

Hybridizing amorphous NiOx nanoflakes and Mn-doped Ni2P nanosheet arrays for enhanced overall water electrocatalysis

W. Zhang, G. Chen, J. Zhao, J. Liang, G. Liu, B. Ji and L. Sun, Sustainable Energy Fuels, 2019, 3, 3093 DOI: 10.1039/C9SE00396G

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