应用 SECM 检测阴极带电不锈钢的氢通量解吸导致的局部电解质酸化

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications Pub Date : 2024-09-24 DOI:10.1016/j.elecom.2024.107812

Malo Duportal, Dao Trinh, Catherine Savall, Xavier Feaugas, Abdelali Oudriss

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引用次数: 0

摘要

这项研究旨在利用扫描电化学显微镜 (SECM) 估算带氢样品的局部 pH 值变化。为此，微电极在质子还原的阴极区域极化。初步校准表明，铂尖的阴极电流对 pH 值变化很敏感。然后，将该系统应用于先前充有氢气的不锈钢表面附近。将这一结果与未带电样品在两种不同 pH 值下的分析结果相结合，发现氢气解吸会引起局部酸化，这可以解释许多研究报告中提到的吸氢后溶解动力学增加的现象。

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Application of SECM to detect a local electrolyte acidification due to the hydrogen flux desorption from a cathodic charged stainless steel

This work aims to estimate local pH variations of a hydrogen charged sample using Scanning ElectroChemical Microscopy (SECM). For that purpose, the microelectrode is polarized in the cathodic domain, where the proton reduction takes place. An initial calibration suggests that cathodic current of the platinum tip is sensitive to pH variations. Then, this system was applied near the surface of stainless steel previously charged with hydrogen. Coupling this result with the analysis of the uncharged samples at two different pH, it appears that hydrogen desorption induces a local acidification which could explain the increase in dissolution kinetics after hydrogen absorption, which has been reported in many studies.

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来源期刊

Electrochemistry Communications 工程技术-电化学

CiteScore

8.50

自引率

3.70%

发文量

160

审稿时长

1.2 months

期刊介绍： Electrochemistry Communications is an open access journal providing fast dissemination of short communications, full communications and mini reviews covering the whole field of electrochemistry which merit urgent publication. Short communications are limited to a maximum of 20,000 characters (including spaces) while full communications and mini reviews are limited to 25,000 characters (including spaces). Supplementary information is permitted for full communications and mini reviews but not for short communications. We aim to be the fastest journal in electrochemistry for these types of papers.