High Resolution Electrochemical Imaging for Sulfur Vacancies on 2D Molybdenum Disulfide,Small Methods

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High Resolution Electrochemical Imaging for Sulfur Vacancies on 2D Molybdenum Disulfide
Small Methods ( IF 10.7 ) Pub Date : 2023-01-22 , DOI: 10.1002/smtd.202201529
Chaoqun Gu ₁ , Tong Sun ₁ , Zhenyu Wang ₁ , Sisi Jiang ₁ , Zonghua Wang ₁

Affiliation

Molybdenum disulfide (MoS₂) is considered as one of the most promising non-noble-metal catalysts for hydrogen evolution reaction (HER). To achieve practical application, introducing sulfur (S) vacancies on the inert basal plane of MoS₂ is a widely accepted strategy to improve its HER activity. However, probing active sites at the nanoscale and quantitatively analyzing the related electrocatalytic activity in electrolyte aqueous solution are still great challenges. In this work, utilizing high-resolution scanning electrochemical microscopy, optimized electrodes and newly designed thermal drift calibration software, the HER activity of the S vacancies on an MoS₂ inert surface is in situ imaged with less than 20-nm-radius sensitivity and the HER kinetic data for S vacancies, including Tafel plot and onset potential, are quantitatively measured. Additionally, the stability of S vacancies over the wide range of pH 0−13 is investigated. This study provides a viable strategy for obtaining the catalytic kinetics of nanoscale active sites on structurally complex electrocatalysts and evaluating the stability of defects in different environments for 2D material-based catalysts.

中文翻译：

二维二硫化钼上硫空位的高分辨率电化学成像

二硫化钼 (MoS ₂ ) 被认为是用于析氢反应 (HER) 的最有前途的非贵金属催化剂之一。_{为了实现实际应用，在 MoS 2}的惰性基面上引入硫 (S) 空位是一种被广泛接受的提高其 HER 活性的策略。然而，探测纳米级的活性位点并定量分析电解质水溶液中的相关电催化活性仍然是一个巨大的挑战。在这项工作中，利用高分辨率扫描电化学显微镜、优化的电极和新设计的热漂移校准软件，MoS 2 上 S 空位的 HER_活性惰性表面以小于 20 nm 半径的灵敏度进行原位成像，并定量测量 S 空位的 HER 动力学数据，包括 Tafel 图和起始电位。此外，还研究了 S 空位在 pH 0−13 的广泛范围内的稳定性。该研究为获得结构复杂电催化剂上纳米级活性位点的催化动力学和评估二维材料基催化剂在不同环境中缺陷的稳定性提供了可行的策略。

更新日期：2023-01-22

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