One-Step Controllable Synthesis of Catalytic Ni4Mo/MoOx/Cu Nanointerfaces for Highly Efficient Water Reduction

Yiming An, Xia Long, Ming Ma, Jue Hu, He Lin, Dan Zhou, Zheng Xing, Bolong Huang (Corresponding Author), Shihe Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

Currently, in addition to the electroactive non-noble metal water-splitting electrocatalysts, a scalable synthetic route and simple activity enhancement strategy is also urgently needed. In particular, the well-controlled synthesis of the well-recognized metal–metal nanointer face in a single step remains a key challenge. Here, the synthesis of Cu-supported Ni4Mo nanodots on MoOx nanosheets (Ni4Mo/MoOx) with controllable Ni4Mo particle size and d-band structure is reported via a facile one-step electrodeposition process. Density functional theory (DFT) calculations reveal that the active open-shell effect from Ni-3d-band optimizes the electronic configuration. The Cu-substrate enables the surface Ni–Mo alloy dots to be more electron-rich, forming a local connected electron-rich network, which boosts the charge transfer for effective binding of O-related species and proton–electron charge exchange in the hydrogen evolution reaction. The Cu-supported Ni4Mo/MoOx shows an ultralow overpotential of 16 mV at a current density of 10 mA cm−2 in 1 m KOH, demonstrating the smallest overpotential, at loadings as low as 0.27 mg cm−2, among all non-noble metal catalysts reported to date. Moreover, an overpotential of 105 mV allows it to achieve a current density of 250 mA cm−2 in 70 °C 30% KOH, a remarkable performance for alkaline hydrogen evolution with competitive potential for applications.

Original languageEnglish
Article number1901454
JournalAdvanced Energy Materials
Volume9
Issue number41
DOIs
Publication statusPublished - 1 Nov 2019

Keywords

  • d-band structure
  • hydrogen evolution reaction
  • nanointerface
  • NiMo
  • one-step synthesis

ASJC Scopus subject areas

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

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