Oxygen-Incorporated NiMoP Nanotube Arrays as Efficient Bifunctional Electrocatalysts For Urea-Assisted Energy-Saving Hydrogen Production in Alkaline Electrolyte

Hao Jiang, Mingzi Sun, Shuilin Wu, Bolong Huang, Chun Sing Lee, Wenjun Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

42 Citations (Scopus)

Abstract

To couple hydrogen evolution reaction (HER) with urea oxidation reaction (UOR) is a promising approach to produce H2 with reduced energy consumption. However, the development of a low-cost and high-performance bifunctional electrocatalyst toward HER and UOR is still a challenge. In this work, oxygen-incorporated nickel molybdenum phosphide nanotube arrays are synthesized on nickel foam (O-NiMoP/NF) via electrodeposition accompanied with in-situ template etching. Benefiting from the modulated electronic structure and the nanotube array architecture of O-NiMoP, the self-supporting O-NiMoP/NF electrodes demonstrate highly efficient bifunctional catalytic activity toward HER and UOR. Particularly, in the HER and UOR (HER||UOR) coupled system for H2 production, a significantly reduced cell voltage of 1.55 V is obtained at the current density of 50 mA cm–2, which is about 300 mV lower than that of the conventional water electrolysis. Density functional theory calculations reveal that the remarkable HER and UOR activities originated from the Ni sites with the modulated electronic environment induced by Mo, P and O atoms, which facilitate the water dissociation during HER and balance the adsorption/desorption of the intermediates during UOR. The development of Ni-based phosphides nanotube arrays as a bifunctional electrocatalyst in HER||OER system provides a new approach enabling energy-saving H2 production.

Original languageEnglish
Article number2104951
JournalAdvanced Functional Materials
Volume31
Issue number43
DOIs
Publication statusPublished - 20 Oct 2021

Keywords

  • electrocatalysis
  • hydrogen evolution reaction
  • nanotube arrays
  • oxygen-incorporated nickel molybdenum phosphide
  • urea oxidation reaction

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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