Hydrogen egress from palladium surfaces: A microelectrode-based investigation

IF 4.5 3区化学 Q1 Chemical Engineering

Journal of Electroanalytical Chemistry Pub Date : 2023-10-01 Epub Date: 2023-08-02 DOI:10.1016/j.jelechem.2023.117690

S. Zhang , K. Nairn , M. Musameh , S. Thomas

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引用次数: 0

Abstract

Atomic hydrogen could participate in multiple electrochemical reactions during egress from Palladium (Pd) into aqueous environments. Possible reactions include hydrogen recombination to form H₂, the oxygen reduction reaction (ORR) and “hydrogen ionisation” to form H⁺. Here, bulk measurements and microelectrode-based methods were used to mechanistically investigate such reactions occurring during hydrogen egress from Pd. Significant ORR was detected on hydrogen-charged Pd (Pd-H) surfaces, when using a Platinum (Pt) microelectrode (ME) in the redox competition mode. However, minor hydrogen recombination was also detected while using the Pt ME in the sample generation-tip collection (SG-TC) mode. Hydrogen ionisation is observed to occur when Pd (H) is anodically polarised. These reactions can all be linked to the highly negative equilibrium potential of the atomic H/H⁺ redox couple. Atomic hydrogen being a strong reducing agent thus tends to efficiently reduce various oxidants in solution resulting in different products, under varying conditions.

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钯表面的氢逸出:基于微电极的研究

原子氢从钯(Pd)逸出到水环境中可以参与多种电化学反应。可能的反应包括氢重组形成H2，氧还原反应(ORR)和“氢电离”形成H+。在这里，体积测量和基于微电极的方法被用来机械地研究这种反应发生在氢气从Pd。当使用铂(Pt)微电极(ME)在氧化还原竞争模式下，在带氢的Pd (Pd- h)表面检测到显著的ORR。然而，在样品生成-尖端收集(SG-TC)模式下使用Pt ME时，也检测到轻微的氢复合。观察到当Pd (H)阳极极化时，会发生氢电离。这些反应都与原子H/H+氧化还原对的高度负平衡电位有关。原子氢是一种强还原剂，因此在不同的条件下往往能有效地还原溶液中的各种氧化剂，从而产生不同的产物。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Electroanalytical Chemistry Chemical Engineering-General Chemical Engineering

CiteScore

7.50

自引率

6.70%

发文量

912

审稿时长

>12 weeks

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.