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<p>Two new silver(I) complexes based on benzimidazole sulfide ligand, [Ag<sub>2</sub>(4py-bbs)<sub>2</sub>(<i>µ-</i>5-hydroxyisophthalate)]·C<sub>2</sub>H<sub>5</sub>OH·4H<sub>2</sub>O (<b>1</b>) and [Ag<sub>2</sub>(4py-bbs)<sub>2</sub>(terephthalate)]·2CH<sub>3</sub>CN·2H<sub>2</sub>O (<b>2</b>) (where 4Py-bbs = bis[1-(pyridin-4-ylmethyl)-benzimidazol-2-ylmethyl]thioether), have been successfully synthesized. Single-crystal structure analysis revealed that although both complexes <b>1–2</b> feature binuclear structures, their central silver ions exhibit different coordination environments. The electrochemical sensing performance of the silver complex modified glassy carbon electrodes (1/2-GCE) was investigated using chronoamperometry. The results demonstrate that 1/2-GCE enable the specific detection of H<sub>2</sub>O<sub>2</sub>, exhibiting a response range of 0.5 µM ~ 4.0 mM, detection limits of 0.39 and 0.41 µM, and sensitivities of 218.59 and 144.37 µA·mM<sup>− 1</sup>·cm<sup>− 2</sup>, respectively. In addition, the 1- and 2-GCEs both showed good electrocatalytic activity for the hydrogen evolution reaction (HER), featuring positive overpotential (<i>η</i><sub><i>10</i></sub>: -722 and − 823 mV) and low Tafel slope (<i>b</i>: 196 and 203 mV·dec<sup>− 1</sup>). The electrocatalytic activity order for H<sub>2</sub>O<sub>2</sub> recognition and HER was 1-GCE &gt; 2-GCE, which depends on the coordination environment of silver(I). This study provides a new thought for designing more efficient electrode materials.</p>

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Electrocatalysts for H2O2-sensing and hydrogen evolution reaction on modified electrodes with two silver(I) benzimidazole sulfide complexes

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • Yuanyue Ma,
  • Rongrong Gao,
  • Junjie Teng,
  • Quanlong Cai,
  • Huilu Wu

摘要

Two new silver(I) complexes based on benzimidazole sulfide ligand, [Ag2(4py-bbs)2(µ-5-hydroxyisophthalate)]·C2H5OH·4H2O (1) and [Ag2(4py-bbs)2(terephthalate)]·2CH3CN·2H2O (2) (where 4Py-bbs = bis[1-(pyridin-4-ylmethyl)-benzimidazol-2-ylmethyl]thioether), have been successfully synthesized. Single-crystal structure analysis revealed that although both complexes 1–2 feature binuclear structures, their central silver ions exhibit different coordination environments. The electrochemical sensing performance of the silver complex modified glassy carbon electrodes (1/2-GCE) was investigated using chronoamperometry. The results demonstrate that 1/2-GCE enable the specific detection of H2O2, exhibiting a response range of 0.5 µM ~ 4.0 mM, detection limits of 0.39 and 0.41 µM, and sensitivities of 218.59 and 144.37 µA·mM− 1·cm− 2, respectively. In addition, the 1- and 2-GCEs both showed good electrocatalytic activity for the hydrogen evolution reaction (HER), featuring positive overpotential (η10: -722 and − 823 mV) and low Tafel slope (b: 196 and 203 mV·dec− 1). The electrocatalytic activity order for H2O2 recognition and HER was 1-GCE > 2-GCE, which depends on the coordination environment of silver(I). This study provides a new thought for designing more efficient electrode materials.