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Comparative studies of ethylene glycol electrooxidation by Pt and Pd nanoparticles supported on different conducting polymers – A DEMS study
Journal of Electroanalytical Chemistry ( IF 4.5 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.jelechem.2020.114624
K.M. Hassan , A.S. Shatla , A.A. Abd-El-Latif , H. Baltruschat , M. Abdel-Azzem

Abstract The electrocatalysis of ethylene glycol oxidation (EGO) by platinum (Pt) or/and palladium (Pd) metal nanoparticles supported on three conducting polymers, poly-1,5-diaminonaphthalene (p-1,5-DAN), poly-1,8-diaminonaphthalene (p-1,8-DAN), and poly-1,2 diaminoanthraquinone (p-1,2-DAAQ) on a glassy carbon (GC) electrode was investigated at room temperature under a constant electrolyte flow using in situ differential electrochemical mass spectrometry (DEMS). The impact of the three different polymers as support materials on the catalytic activity of EGO was examined. During potentiodynamic measurements, both the faradaic current and the ionic signals corresponding to carbon dioxide (CO2) formation were continuously monitored. For the different catalysts, it was found that EG adsorption was prevented at very low potentials due to blocking by the underpotential deposition of hydrogen species and dissociative adsorption was enhanced upon an increase in the potential. During EGO, CO2 evolution was prohibited at the onset of OHad formation at the surface. A quantitative comparison of CO2 formation was evaluated for these modified conducting polymers. The trend in the current efficiency with respect to CO2 formation was found to be in the order of Pt/Pd/p-1,8-DAN/GC > Pt/Pd/p-1,5-DAN/GC > Pt/Pd/p-1,2-DAAQ/GC (shell–core). The current efficiency of CO2 production at the Pt/Pd/p-1,8-DAN/GC electrode was recorded as 87.5%, which is higher than reported in the literature. The roles played by the three studied polymers are discussed in this study, in which P-1,8-DAN shows excellent behavior as an attractive material for supporting metal nanoparticles due to its high active surface area and high electrical conductivity.

中文翻译:

负载在不同导电聚合物上的铂和钯纳米颗粒对乙二醇电氧化的比较研究——DEMS 研究

摘要 负载在三种导电聚合物上的铂 (Pt) 或/和钯 (Pd) 金属纳米粒子对乙二醇氧化 (EGO) 的电催化作用,聚 1,5-二氨基萘 (p-1,5-DAN)、poly-1 ,8-二氨基萘 (p-1,8-DAN) 和聚 1,2 二氨基蒽醌 (p-1,2-DAAQ) 在玻璃碳 (GC) 电极上在室温下在恒定的电解液流量下进行了研究。原位微分电化学质谱(DEMS)。检查了作为载体材料的三种不同聚合物对 EGO 催化活性的影响。在动电位测量期间,连续监测法拉第电流和对应于二氧化碳 (CO2) 形成的离子信号。对于不同的催化剂,发现由于氢物质的欠电位沉积而阻止了EG吸附在非常低的电位下并且随着电位的增加而增强了解离吸附。在 EGO 期间,在地表开始形成 OHad 时禁止 CO2 析出。对这些改性导电聚合物的 CO2 形成进行了定量比较。发现与 CO2 形成有关的电流效率的趋势是 Pt/Pd/p-1,8-DAN/GC > Pt/Pd/p-1,5-DAN/GC > Pt/Pd /p-1,2-DAAQ/GC(壳核)。目前 Pt/Pd/p-1,8-DAN/GC 电极的 CO2 生产效率记录为 87.5%,高于文献报道。本研究讨论了三种研究的聚合物所起的作用,其中 P-1、
更新日期:2020-12-01
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