WOx-Surface Decorated PtNi@Pt Dendritic Nanowires as Efficient pH-Universal Hydrogen Evolution Electrocatalysts

Weiyu Zhang, Bolong Huang, Kai Wang, Wenxiu Yang, Fan Lv, Na Li, Yuguang Chao, Peng Zhou, Yong Yang, Yingjie Li, Jinhui Zhou, Wenshu Zhang, Yaping Du, Dong Su, Shaojun Guo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)

Abstract

The hydrogen evolution reaction (HER) is a pivotal element of electrochemical water splitting which is able to produce clean hydrogen as an alternative to fossil fuel. Developing efficient Pt-based electrocatalysts for the HER to work at all pHs is highly desirable, however, still a significant challenge, especially in alkaline conditions due to sluggish water dissociation and OHad transfer. Here, a new strategy for making a class of amorphous WOx-surface decorated PtNi@Pt dendritic nanowires (WOx-PtNi@Pt DNWs) to achieve highly efficient pH-universal HER electrocatalysis is reported. The as-made WOx-PtNi@Pt DNWs display superior HER performance with the overpotentials of 24, 5, and 22 mV in 0.1 m KOH, 0.1 m HClO4, and 0.5 m phosphate-buffered saline, respectively, at a current density of 10 mA cm−2. The mass activity of WOx-PtNi@Pt DNWs in alkaline conditions is 3.3 mA μgPt−1 at an overpotential of 70 mV, among the best in all the reported materials. Theoretical calculations confirm the introduction of WOx to the PtNi DNWs plays a pivotal role in promoting the efficient electron transfer for the alkaline and acidic HER. The activation of the PtNi region within the Pt-Ni-W-O interface is achieved by the WOx induced strain effect, which guarantees the superior performance in the HER.

Original languageEnglish
Article number2003192
JournalAdvanced Energy Materials
Volume11
Issue number3
DOIs
Publication statusPublished - 21 Jan 2021

Keywords

  • amorphous WO
  • dendritic nanowires
  • hydrogen evolution reaction
  • pH-universal
  • water dissociation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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