Regulating Phase Conversion from Ni3Se2 into NiSe in a Bifunctional Electrocatalyst for Overall Water-Splitting Enhancement

Yueyao Zhong, Bin Chang, Yongliang Shao, Chengwei Xu, Yongzhong Wu*, Xiaopeng Hao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Phase engineering has been demonstrated as an efficient method for the enhancement of catalytic activity. This study concerns the phase and morphology modulation of Ni3Se2/NiSe nanorod arrays through a hydrothermal process. Partial phase conversion can effectively enhance the electrical conductivity and yield more active sites through atom rearrangement during phase transformation. Quite low optimal overpotentials of 166 mV for the hydrogen evolution reaction (HER) and 370 mV for the oxygen evolution reaction (OER) are obtained in a sample containing 32.4 % of NiSe phase and 67.6 % of Ni3Se2 phase. The performance is superior to the samples with only one phase. Furthermore, a water electrolyzer was assembled by using two symmetrical NiSe/Ni foam electrodes as the anode and cathode, which can deliver 10 mA cm−2 at a low voltage of 1.61 V. More significantly, the water electrolyzer can be operated at 10 mA cm−2 over 10 h without noticeable degradation, showing extraordinary operational stability. This phase conversion control strategy provides a new way to improve the catalytic activity of NiSe and may have potential use in the design of other selenide electrocatalysts.

Original languageEnglish (US)
Pages (from-to)2008-2014
Number of pages7
JournalCHEMSUSCHEM
Volume12
Issue number9
DOIs
StatePublished - May 8 2019

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China (Contract 51572153, 51602177), the Major Basic Program of the Natural Science Foundation of Shandong Province (Contract ZR2017ZB0317), and the Natural Science Foundation of Shandong Province (Grant No. ZR2014HM023)

Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • electrocatalysts
  • NiSe
  • phase conversion
  • water splitting

ASJC Scopus subject areas

  • Environmental Chemistry
  • General Chemical Engineering
  • General Materials Science
  • General Energy

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