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<p>The surging global energy demand, coupled with diminishing fossil fuel reserves, is accelerating the technological advancement of clean hydrogen production through water electrolysis. Although molybdenum disulfide (MoS<sub>2</sub>) has been widely recognized as an efficient electrocatalyst for the hydrogen evolution reaction (HER), its practical implementation in clean hydrogen energy systems remains constrained by the sluggish kinetics of the oxygen evolution reaction (OER). This study presents a synergistic optimization strategy aimed at concurrently enhancing electron and proton transfer kinetics within MoS<sub>2</sub>-based OER systems. Through a facile solid-state mechanochemical protocol involving direct ball milling of commercial MoS<sub>2</sub> with silver nitrate precursors, we successfully synthesized NO<sup>3−</sup>-grafted MoS<sub>2</sub>@Ag nanohybrids. Electrochemical evaluation in alkaline medium (1&#xa0;M KOH) revealed exceptional OER performance, achieving a current density of 10&#xa0;mA&#xa0;cm<sup>−2</sup> at an overpotential of merely 259&#xa0;mV, coupled with a Tafel slope of 98.84&#xa0;mV·dec<sup>−1</sup>. Notably, the engineered nanohybrid demonstrated exceptional operational stability. Systematic characterization elucidated that the performance enhancement originated from two complementary mechanisms: (i) accelerated electron transfer kinetics through partial phase transition from semiconducting 2H-MoS<sub>2</sub> to metallic 1&#xa0;T-MoS<sub>2</sub> coupled with Ag-induced electronic structure modulation and (ii) optimized proton transfer dynamics enabled by NO<sup>3−</sup>-mediated buffer effects that promote deprotonation of critical reaction intermediates.</p>

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Proton and electron engineering in silver nanocluster-modified MoS2 composite material for improved oxygen evolution reaction performance

  • 期刊论文

  • 发表日期：

    2025年5月22日

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  • Junwei Wu,
  • Yan Zheng,
  • Mengyan Huang,
  • Peiyan Ma,
  • Zhengyi Fu

摘要

The surging global energy demand, coupled with diminishing fossil fuel reserves, is accelerating the technological advancement of clean hydrogen production through water electrolysis. Although molybdenum disulfide (MoS2) has been widely recognized as an efficient electrocatalyst for the hydrogen evolution reaction (HER), its practical implementation in clean hydrogen energy systems remains constrained by the sluggish kinetics of the oxygen evolution reaction (OER). This study presents a synergistic optimization strategy aimed at concurrently enhancing electron and proton transfer kinetics within MoS2-based OER systems. Through a facile solid-state mechanochemical protocol involving direct ball milling of commercial MoS2 with silver nitrate precursors, we successfully synthesized NO3−-grafted MoS2@Ag nanohybrids. Electrochemical evaluation in alkaline medium (1 M KOH) revealed exceptional OER performance, achieving a current density of 10 mA cm−2 at an overpotential of merely 259 mV, coupled with a Tafel slope of 98.84 mV·dec−1. Notably, the engineered nanohybrid demonstrated exceptional operational stability. Systematic characterization elucidated that the performance enhancement originated from two complementary mechanisms: (i) accelerated electron transfer kinetics through partial phase transition from semiconducting 2H-MoS2 to metallic 1 T-MoS2 coupled with Ag-induced electronic structure modulation and (ii) optimized proton transfer dynamics enabled by NO3−-mediated buffer effects that promote deprotonation of critical reaction intermediates.