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Conductive Tungsten Oxide Nanosheets for Highly Efficient Hydrogen Evolution.

Tingting Zheng1, Wei Sang1, Zhihai He1

  • 1Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China , Hefei, Anhui 230026, P. R. China.

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Summary
This summary is machine-generated.

Introducing oxygen vacancies into tungsten oxide (WO₃) nanosheets enhances its conductivity and hydrogen adsorption, creating an efficient, economical electrocatalyst for hydrogen evolution via water splitting.

Keywords:
Conductive nanosheetHERO vacanciesgap states

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient and economical electrocatalysts for hydrogen evolution reaction (HER) is crucial for industrial-scale water splitting.
  • Tungsten oxide (WO₃) is a potential non-precious metal catalyst for hydrogen production, but its intrinsic activity is limited.
  • Oxygen vacancies are explored to enhance the performance of WO₃-based electrocatalysts.

Purpose of the Study:

  • To design and synthesize a highly efficient hydrogen evolution electrocatalyst by introducing oxygen vacancies into WO₃ nanosheets.
  • To investigate the electronic properties and hydrogen adsorption characteristics of oxygen-vacancy-rich WO₃.
  • To evaluate the electrocatalytic performance of the modified WO₃ for hydrogen evolution.

Main Methods:

  • First-principles calculations to understand the electronic structure and hydrogen adsorption.
  • Liquid exfoliation method to prepare WO₃ nanosheets with oxygen vacancies.
  • Electrochemical characterization, including overpotential and Tafel slope measurements for hydrogen evolution.

Main Results:

  • First-principles calculations confirmed that oxygen vacancies create gap states, leading to degenerate semiconductor behavior, high conductivity, and favorable hydrogen adsorption free energy in WO₃.
  • Experimentally synthesized WO₃ nanosheets rich in oxygen vacancies exhibited degenerate semiconductor characteristics.
  • The WO₃ nanosheets demonstrated superior HER performance with a low overpotential of 38 mV at 10 mA cm⁻² and a Tafel slope of 38 mV dec⁻¹.

Conclusions:

  • Introducing oxygen vacancies is an effective strategy to enhance the conductivity and catalytic activity of tungsten oxide for hydrogen evolution.
  • Oxygen-vacancy-rich WO₃ nanosheets show great potential as a non-precious metal alternative to platinum for hydrogen production.
  • This research provides a viable pathway for developing advanced conductive tungsten oxide electrocatalysts.