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Research Article

Engineered porous Ni2P-nanoparticle/Ni2P-nanosheet arrays via the Kirkendall effect and Ostwald ripening towards efficient overall water splitting

Yutai Wu1, Hui Wang1, Shan Ji2( ), Bruno G. Pollet3, Xuyun Wang1, Rongfang Wang1( )
State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
College of Biological, Chemical Science and Chemical Engineering, Jiaxing University, Jiaxing 314001, China
Department of Energy and Process Engineering, Faculty of Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
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Graphical Abstract

Abstract

Transitional metal phosphides with array-like structure grown on conductive support materials are promising bifunctional catalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In this study, a method was developed to synthesize directly porous Ni2P nanosheet arrays and Ni2P nanoparticles onto nickel foam via a hydrothermal reaction followed by a phosphorization process. Mechanistic studies revealed that the allomorphs of Ni2P nanosheets and Ni2P nanoparticles in the array-like structure were formed via the Kirkendall effect and Ostwald ripening. A fully functional water electrolyzer containing Ni2P as electrodes for the OER and HER exhibited promising activity and stability. At 10 mA·cm-2, a Ni2P cell voltage of 1.63 V was obtained, which was only 0.05 V smaller than that found for Pt/C/NF||RuO2/NF cell. The enhanced electrocatalytic performance resulted from the favorable porosity of the Ni2P arrays and the synergistic effect between Ni2P nanosheets and Ni2P nanoparticles.

Keywords

Ni2P catalystsarraysoverall water splittingKirkendall effectOstwald ripening

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Nano Research
Volume 13 Issue 8,
August 2020
Pages 2098-2105
DOI: 10.1007/s12274-020-2816-7
Cite this article:
Wu Y, Wang H, Ji S, et al. Engineered porous Ni2P-nanoparticle/Ni2P-nanosheet arrays via the Kirkendall effect and Ostwald ripening towards efficient overall water splitting. Nano Research, 2020, 13(8): 2098-2105. https://doi.org/10.1007/s12274-020-2816-7
Topics:
NanoparticlesNanosheetsPhosphorus compoundsRuthenium compoundsSynthesis (chemical)

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Received: 17 December 2019
Revised: 13 April 2020
Accepted: 18 April 2020
Published: 05 August 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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