Effect of CeO₂-ZrO₂ on Pt/C electrocatalysts for alcohols oxidation

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• 作者：Qingchun WANG ((王青春))^a ; ^b ; Zhenpeng LIU ((刘振朋))^b ; Shengli AN ((安胜利))^a ; ^b ; ^{san@imust.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Ruifen WANG ((王瑞芬))^a ; ^b ; Yanling WANG ((王艳玲))^c ; Tuo XU ((徐 拓))^b
• 关键词：CeO2-ZrO2 ; composite oxide ; catalyst ; preparation ; characterization ; performance ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：34
• 期：3
• 页码：276-282
• 全文大小：1023 K

文摘

The electrocatalytic activity and stability of Pt/C catalyst modified by using CeO₂-ZrO₂ mixed oxides for the alcohols electrochemical oxidation as probes were investigated. The catalyst samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical properties were measured by a three electrode system on electrochemical workstation (IVIUM). The results showed that the presence of CeO₂-ZrO₂ might be associated with the presence of Pt, which indicated that possibly there was synergistic effect between CeO₂-ZrO₂ and Pt nanoparticles. The electrocatalytic activity and stability of Pt-MO_x/C (M=Ce, Zr) for methanol and ethanol oxidation was better than that of Pt-CeO₂/C, which was attributed to that CeO₂-ZrO₂ composited oxides enhanced oxygen mobility and promoted oxygen storage capacity (OSC). Furthermore, the best performance was found when the molar ratio of CeO₂ to ZrO₂ was 2:1 for the oxidation of methanol and ethanol. The forward peak current density of Pt-MO_x/C (M=Ce, Zr, Ce:Zr=2:1) towards the methanol electrooxidation was about 3.8 times that of Pt-CeO₂/C. Pt-MO_x/C (M=Ce, Zr) appeared to be a promising and less expensive methanol oxidation anode catalyst.