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Mechanistic Aspects of Methanol Electro‐Oxidation Reaction through Cyclic Voltammetry: Is It Correct to Blame Carbon Monoxide for Catalyst Poisoning?
Energy Technology ( IF 3.6 ) Pub Date : 2020-01-30 , DOI: 10.1002/ente.201900955 Pooja S. Deshpande 1, 2 , Vijay R. Chaudhari 1 , Bhagavatula L. V. Prasad 1, 2
Energy Technology ( IF 3.6 ) Pub Date : 2020-01-30 , DOI: 10.1002/ente.201900955 Pooja S. Deshpande 1, 2 , Vijay R. Chaudhari 1 , Bhagavatula L. V. Prasad 1, 2
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Many previously unknown facts have been revealed by the reinvestigation of the cyclic voltammetric (CV) response of the methanol oxidation reaction (MOR) in acidic medium using Pt/C as the electrocatalyst. Systematic CV analysis clearly suggests that the peak during the cathodic scan in the CV of MOR belongs mainly to electro‐oxidation of the carbon monoxide (CO) species, which is not truly adsorbed on the electrode surface and hence has less possibility to poison the electrode surface. Interestingly, an additional peak is observed in the anodic scan at higher scan rates and the results suggest that this peak is associated with surface‐confined electrochemical processes related to the oxidative desorption of leftover CO. This clearly highlights the necessity to relook at the notion of correlating the ratio of the peak currents in the anodic versus cathodic directions to CO poisoning, which is routinely used for the evaluation of the electrode performance in MOR. Through simple but accurate CV experiments, this report clearly brings out the important criteria that should be looked into while evaluating the electrocatalyst performance in the MOR process.
中文翻译：
通过循环伏安法进行甲醇电氧化反应的机理方面：用一氧化碳燃烧催化剂中毒是否正确？
通过对使用Pt / C作为电催化剂的酸性介质中甲醇氧化反应（MOR）的循环伏安（CV）响应进行重新研究，揭示了许多以前未知的事实。系统的CV分析清楚地表明，在MOR的CV中进行阴极扫描时的峰主要属于一氧化碳（CO）物种的电氧化，这种氧化并没有真正吸附在电极表面上，因此中毒电极的可能性较小表面。有趣的是，在阳极扫描中以较高的扫描速率观察到一个额外的峰，结果表明该峰与表面残留的电化学过程有关，该过程与剩余的CO的氧化脱附有关。这清楚地突出表明，有必要重新考虑将阳极方向与阴极方向上的峰值电流之比与CO中毒相关联的概念，该概念通常用于评估MOR中的电极性能。通过简单但准确的CV实验，该报告清楚地提出了评估MOR过程中电催化剂性能时应考虑的重要标准。
更新日期：2020-01-30
中文翻译：
通过循环伏安法进行甲醇电氧化反应的机理方面：用一氧化碳燃烧催化剂中毒是否正确？
通过对使用Pt / C作为电催化剂的酸性介质中甲醇氧化反应（MOR）的循环伏安（CV）响应进行重新研究，揭示了许多以前未知的事实。系统的CV分析清楚地表明，在MOR的CV中进行阴极扫描时的峰主要属于一氧化碳（CO）物种的电氧化，这种氧化并没有真正吸附在电极表面上，因此中毒电极的可能性较小表面。有趣的是，在阳极扫描中以较高的扫描速率观察到一个额外的峰，结果表明该峰与表面残留的电化学过程有关，该过程与剩余的CO的氧化脱附有关。这清楚地突出表明，有必要重新考虑将阳极方向与阴极方向上的峰值电流之比与CO中毒相关联的概念，该概念通常用于评估MOR中的电极性能。通过简单但准确的CV实验，该报告清楚地提出了评估MOR过程中电催化剂性能时应考虑的重要标准。
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