Nano-Au Catalysts Modified with TiO2: Enhancement of Electrocatalytic Activity for 1-Propanol Oxidation in Alkaline Media
Nano-Au Catalysts Modified with TiO2: Enhancement of Electrocatalytic Activity for 1-Propanol Oxidation in Alkaline Media
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DOI：
10.1149/2.0741912jes
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发表时间：
2019
影响因子：
3.9
通讯作者：
W. Chiu;Yi-Hsuan Chiu;P. Hsieh;T. Chang;M. Sone;Y. Hsu;A. Tixier-Mita;H. Toshiyoshi
中科院分区：
文献类型：
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作者：
W. Chiu;Yi-Hsuan Chiu;P. Hsieh;T. Chang;M. Sone;Y. Hsu;A. Tixier-Mita;H. Toshiyoshi
燃料电池作为一种清洁能源，其阳极氧化的电催化活性是燃料电池研究的一个关键问题。由于碳质残留物吸附在电极表面，导致催化剂性能恶化，也称为电极中毒。碳质残留物的解吸被认为是一种必要的解决方案，但尚未进行系统的研究。在这项工作中，我们研究了金纳米颗粒(NPs)- tio2 /聚苯胺（PANI）复合材料对碳质残留物的解吸和对醇氧化反应电催化活性的促进，以提高醇氧化电催化反应的总体活性。用循环伏安法（CV）测量了不同醇类的碳质残留物的解吸和醇氧化反应的电催化活性。测量了计时电流i-t曲线，以评价其稳定性。对碳质渣滓解吸和提高电催化活性的机理进行了阐述和总结。有tio2修饰的电极比无tio2的电极表现出更好的性能。此外，Au nps修饰的复合材料不仅显示出醇氧化反应的额外特征峰，而且对已经存在的氧化反应产生建设性作用，表明醇的电催化氧化有促进作用。
Electrocatalytic activity of the anode for alcohols oxidation is a critical issue in fuel cell which is considered as a clean energy. Performance deterioration of the catalyst takes place due to the adsorption of carbonaceous residues on the electrode surface, which is also known as poisoning of the electrode. Desorption of carbonaceous residues is thought to be an essential solution but not has been studied systematically. In this work, we investigate both the desorption of carbonaceous residues and the promotion of electrocatalytic activity to alcohols oxidation reactions by using Au nanoparticles (NPs)-TiO 2/polyaniline (PANI) composite to boost the overall activity of electrocatalytic alcohol oxidation reactions. Desorption of carbonaceous residues and electrocatalytic activity of alcohol oxidation reactions are evaluated by cyclic voltammetry (CV) measurements in various alcohols. The chronoamperometric i-t curves are measured to evaluate the stability. Mechanisms for desorption of carbonaceous residues and enhancement of the electrocatalytic activity are elaborated and summarized. Electrodes with TiO 2 decoration show better performance than TiO 2-free specimens. In addition, Au NPs-decorated composites not only show an extra characteristic peak of alcohol oxidation reactions but also perform a constructive effect on the already existing oxidation reaction, indicating the promotion of electrocatalytic oxidation of alcohols.