Electrochemical Deposition of Graphene Supported PtCo Composite Catalysts for Electrocatalytic Methanol Oxidation

doi:10.6023/A12080553

Acta Chimica Sinica ›› 2013, Vol. 71 ›› Issue (02): 227-233.DOI: 10.6023/A12080553 Previous Articles Next Articles

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电化学合成PtCo/石墨烯复合催化剂及对甲醇的电催化氧化

史国玉^a,b, 王宗花^a,b, 夏建飞^a,b, 张菲菲^a,b, 夏延致^a,b, 李延辉^a

a 青岛大学纤维新材料与现代纺织实验室国家重点实验室培育基地青岛 266071;
b 青岛大学化学化工与环境学院青岛 266071

投稿日期:2012-08-14 发布日期:2013-01-09
通讯作者: 王宗花, 夏延致 E-mail:wangzonghua@qdu.edu.cn; qduxyzh@163.com
基金资助:
项目受国家自然科学基金(Nos. 20975056, 81102411, 21275082);山东省自然科学基金(Nos. ZR2011BZ004, ZR2011BQ005);NSFC-JSPS中日合作与交流项目(No. 21111140014);生命分析化学国家重点实验室开放基金(No. SKLACLS1110)和973计划的资助(No. 2012CB722705)资助.

Electrochemical Deposition of Graphene Supported PtCo Composite Catalysts for Electrocatalytic Methanol Oxidation

Shi Guoyu^a,b, Wang Zonghua^a,b, Xia Jianfei^a,b, Zhang Feifei^a,b, Xia Yanzhi^a,b, Li Yanhui^a

a Laboratory of Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao 266071;
b College of Chemical and Environment Engineering, Qingdao University, Qingdao 266071

Received:2012-08-14 Published:2013-01-09
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 20975056, 81102411, 21275082), Natural Science Foundation of Shandong (Nos. ZR2011BZ004, ZR2011BQ005), Japan Society for the Promotion of Science and National Natural Science Foundation of China under the Japan-China Scientific Cooperation Program (No. 21111140014), State Key Laboratory of Analytical Chemistry for Life Science (No. SKLACLS1110) and the National Key Basic Research Development Program of China (973 special preliminary study plan, Grant no.: 2012CB722705).

Direct methanol fuel cells are excellent power sources due to their high energy density, low pollutant emission and easy handling. However, commercial applications are limited by the high cost related to noble metal catalysts. Recent findings have proved that appropriate catalyst support, which improves the utilization of the noble metals in great depth, may be one breakthrough. Graphene nanosheet (GNS), a new two-dimensional carbon material with a single (or a few) atomic thickness, as the combination of its high surface area, high conductivity and unique graphitized basal plane structure, has recently attracted an enormous amount of interest from both theoretical and experimental scientists. It has been proved that catalysts supported on GNSs show improved activity than those supported on carbon black. Furthermore, alloying Pt with other metal is widely approved as a practical method to relieve the CO-poisoning of the catalyst, which can be ascribed to both a bi-functional mechanism and a ligand (electronic) effect. In this experiment, PtCo/graphene (GN) composite catalysts were synthesized on an indium tin oxide (ITO) substrate by the potentiostatic method. Catalyst samples were characterized by scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDX) and electrochemical methods. SEM results showed that the addition of graphene could enhance the dispersion of the catalytic particles and reduce the particle size, especially when the molar ratio of Pt and Co is 1:2.93, the particles had the smallest size and the best dispersion. Electrochemical tests demonstrated that graphene as the catalytic support could improve the CO-tolerance of the catalysts, which was determined by the outstanding electric conductivity and rich oxygen-containing species of graphene, resulting in good performance for electrocatalytic methanol oxidation. Furthermore, owing to the special electronic effect of Co, its addition also influenced the catalytic activity. It was found that when the molar ratio of Pt and Co was 1:2.93, the composite catalyst exhibited the most excellent catalytic performance for electrocatalytic methanol oxidation with the forward anodic peak current density of 662 A·g_pt^-1and the I_f/I_b of 2.34 which was nearly 1.8 times that of the traditional PtCo/C catalyst (I_f/I_b=1.32).

Key words: graphene, methanol oxidation, PtCo composite catalyst, electrodeposition, CO-tolerance

Cite this article

Shi Guoyu, Wang Zonghua, Xia Jianfei, Zhang Feifei, Xia Yanzhi, Li Yanhui. Electrochemical Deposition of Graphene Supported PtCo Composite Catalysts for Electrocatalytic Methanol Oxidation[J]. Acta Chimica Sinica, 2013, 71(02): 227-233.

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电化学合成PtCo/石墨烯复合催化剂及对甲醇的电催化氧化

Electrochemical Deposition of Graphene Supported PtCo Composite Catalysts for Electrocatalytic Methanol Oxidation

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