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Abstract <p>Carbonized MoO<sub>3</sub> and graphene-MoO<sub>3</sub> were successfully synthesized for hydrogen evolution, using glucose and graphene with (NH<sub>4</sub>)<sub>6</sub>Mo<sub>7</sub>O<sub>24</sub>·4H<sub>2</sub>O as precursors, respectively. The prepared products were comprehensively characterized using a suite of analytical techniques, including scanning electron microscopy, thermogravimetry and differential scanning calorimetry, and X-ray diffraction. The electrochemical performance of graphene-MoO<sub>3</sub> was systematically evaluated through linear sweep voltammetry, while electrochemical impedance spectroscopy was used to investigate the hydrogen evolution reaction at the electrode interface. The hydrogen evolution overpotential of graphene-MoO<sub>3</sub> modified GCE at 10 mA/cm<sup>2</sup> was 462 mV vs RHE, exhibiting a Tafel slope of 184 mV&#xa0;dec<sup>–1</sup>, by regulating the structure, resistance, and crystal size of MoO<sub>3</sub> crystals.</p>

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Impact of Modulating MoO3 Crystal Ctructure and Size on Electrolytic Hydrogen Evolution Catalysis

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Y. Z. Song,
  • S. Jiang,
  • Y. Zhang,
  • E. H. Shi,
  • K. Zhang

摘要

Abstract

Carbonized MoO3 and graphene-MoO3 were successfully synthesized for hydrogen evolution, using glucose and graphene with (NH4)6Mo7O24·4H2O as precursors, respectively. The prepared products were comprehensively characterized using a suite of analytical techniques, including scanning electron microscopy, thermogravimetry and differential scanning calorimetry, and X-ray diffraction. The electrochemical performance of graphene-MoO3 was systematically evaluated through linear sweep voltammetry, while electrochemical impedance spectroscopy was used to investigate the hydrogen evolution reaction at the electrode interface. The hydrogen evolution overpotential of graphene-MoO3 modified GCE at 10 mA/cm2 was 462 mV vs RHE, exhibiting a Tafel slope of 184 mV dec–1, by regulating the structure, resistance, and crystal size of MoO3 crystals.