“三明治式”多层Au/Pt复合薄膜的制备及其对甲醇的电氧化

doi:10.3866/PKU.WHXB20110803

物理化学学报 >> 2011, Vol. 27 >> Issue (08): 1868-1874.doi: 10.3866/PKU.WHXB20110803

“三明治式”多层Au/Pt复合薄膜的制备及其对甲醇的电氧化

赵静, 孙越, 李永军, 梁韧

湖南大学化学化工学院化学系, 长沙 410082

收稿日期:2011-04-11 修回日期:2011-05-31 发布日期:2011-07-19
通讯作者: 李永军 E-mail:liyongjunef@gmail.com
基金资助:
国家自然科学基金(20703016), 湖南省科技计划(2010FJ6030)及固体表面物理化学国家重点实验室(厦门大学)开放课题经费资助

Preparation of ‘Sandwich-Like’ Au/Pt Composite Multilayer Films for Methanol Electrooxidation

ZHAO Jing, SUN Yue, LI Yong-Jun, LIANG Ren

Department of Chemisty, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China

Received:2011-04-11 Revised:2011-05-31 Published:2011-07-19
Contact: LI Yong-Jun E-mail:liyongjunef@gmail.com
Supported by:
The project was supported by the National Natural Science Foundation of China (20703016), Scientific and Technological Projects of Hunan Province, China (2010FJ6030) and State Key Laboratory for Physical Chemistry of Solid Surface (Xiamen University), China.

摘要/Abstract

摘要：

采用界面组装、欠电位沉积和氧化还原置换反应组合方法制备了单层Pt/Au复合薄膜, 并且不需要任何有机偶联剂; 组装单层Pt/Au复合薄膜为三类多层Pt/Au复合薄膜: (Pt/Au)_n、Pt_m/Au和(Pt₃/Au)_k (n、m和k分别为Pt/Au、Pt和Pt₃/Au的层数). 采用电子显微镜研究了Au纳米粒子单层膜和Pt/Au复合多层膜的形貌. 对于所有的多层膜电极而言, 其电化学活性面积随着层数的增加而增加. 通过研究甲醇在每一类Pt/Au复合薄膜上的氧化电流密度, 考察了其对甲醇的电催化和抗毒化性能. 对于同一类复合薄膜而言, 甲醇分别在(Pt/Au)₃、Pt₃/Au和(Pt₃/Au)₂电极上均具有最大的氧化电流密度, 且优于本体Pt电极. 在这三种电极中, (Pt/Au)₃电极无论从电流密度上还是从抗毒化能力上讲, 其性能是最好的, 而且其抗毒化能力也优于商业Pt/C催化剂. 这种良好的催化性能源于Au和Pt之间最大化的协同效应, 这取决于Pt和Au原子比率以及Pt纳米层和Au纳米层之间的排布方式.

关键词: 界面组装, 欠电位沉积, Au/Pt复合多层膜, 电氧化, 甲醇

Abstract:

Pt/Au composite monolayer films were fabricated by combining interfacial assembly and under-potential deposition (UPD) with redox replacement. Based on the Pt/Au composite monolayers, an organic linker-free method was proposed for the fabrication of sandwich-like Pt/Au composite multilayer films: (Pt/Au)_n, Pt_m/Au, and (Pt₃/Au)_k (n, m, or k represents the layer number). Electron microscopy was used to characterize the morphologies of the Au monolayer films and the Pt/Au composite multilayer films. For each type of composite multilayer films, a common characteristic was that the effective electroactive areas increased with an increase in the layer number. Additionally, the electrocatalytic activities of the composite multilayer films for methanol electrooxidation are systematically discussed by examining the catalytic current densities and its tolerance toward carbonaceous species. For the same series of composite multilayer films (Pt/Au)₃, Pt₃/Au, and (Pt₃/Au)₂ showed a higher catalytic current density than bulk Pt (Pt_bulk). Among the three composite multilayer films, (Pt/Au)₃ showed the best catalytic performance in terms of the current density and tolerance toward carbonaceous species. The tolerance of (Pt/Au)₃ to carbonaceous species was found to be better than that of the commercial Pt/C catalyst. This better electrocatalytic activity may be attributed to the maximum synergistic effect between Au and Pt, which depends on the Pt:Au atomic ratio and also the arrangement of Pt and Au nanoparticles.

Key words: Interfacial self-assembly, Under-potential deposition, Au/Pt composite multilayer film, Electrooxidation, Methanol

赵静, 孙越, 李永军, 梁韧. “三明治式”多层Au/Pt复合薄膜的制备及其对甲醇的电氧化[J]. 物理化学学报, 2011, 27(08), 1868-1874. doi: 10.3866/PKU.WHXB20110803

ZHAO Jing, SUN Yue, LI Yong-Jun, LIANG Ren. Preparation of ‘Sandwich-Like’ Au/Pt Composite Multilayer Films for Methanol Electrooxidation[J]. Acta Phys. -Chim. Sin. 2011, 27(08), 1868-1874. doi: 10.3866/PKU.WHXB20110803

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB20110803

https://www.whxb.pku.edu.cn/CN/Y2011/V27/I08/1868

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“三明治式”多层Au/Pt复合薄膜的制备及其对甲醇的电氧化

Preparation of ‘Sandwich-Like’ Au/Pt Composite Multilayer Films for Methanol Electrooxidation

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