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

Wu, Yutai; Wang, Hui; Ji, Shan; Pollet, Bruno; Wang, Xuyun; Wang, Rongfang
Peer reviewed, Journal article
Published version
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Wu (Locked)
URI
https://hdl.handle.net/11250/2780632
Date
2020
Metadata
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  • Institutt for energi og prosessteknikk [3337]
  • Publikasjoner fra CRIStin - NTNU [26746]
Original version
Nano Reseach. 2020, 13 (8), 2098-2105.   10.1007/s12274-020-2816-7
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.
Publisher
Springer
Journal
Nano Reseach
Copyright
This version of the article will not be available due to copyright restrictions by Springer

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