Synthesis and Electrocatalytic Performance of Cu@Pt/MWCNTs-MnO2 Electrocatalyst

doi:10.6023/A12050234

Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (22): 2359-2364.DOI: 10.6023/A12050234 Previous Articles Next Articles

Article

Cu@Pt/MWCNTs-MnO₂电催化剂的制备及电催化性能研究

于书平, 娄群, 刘润婷, 韩克飞, 汪中明, 朱红

北京化工大学化工资源有效利用国家重点实验室北京 100029

投稿日期:2012-10-16 发布日期:2012-10-31
通讯作者: 朱红 E-mail:zhuho128@126.com
基金资助:
项目受国家自然科学基金(No. 21176022)、国际合作(No. 2009DFA63120)和国防科学研究(No. A1420110023)资助.

Synthesis and Electrocatalytic Performance of Cu@Pt/MWCNTs-MnO₂ Electrocatalyst

Yu Shuping, Lou Qun, Liu Runting, Han Kefei, Wang Zhongming, Zhu Hong

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029

Received:2012-10-16 Published:2012-10-31
Supported by:
Project supported by the National Natural Science Foundation of China (No. 21176022), the International S&T Cooperation Program of China (No. 2009DFA63120), and the National Defense Basic Scientific Research Program of China (No. A1420110023).

1. Synthesis and Electrocatalytic Performance of Cu@Pt/MWCNTs-MnO₂ Electrocatalyst.PDF(108KB)

Abstract

The core-shell structure catalysts with reduced Pt loading and improved catalytic activity which are inter-metallic Pt electrocatalyst with a cheap transition metal core have become a critical issue in fuel cells. In this study, Cu@Pt/MWCNTs core-shell electrocatalyst was prepared through the impregnation chemical reduction method, by using ethylene glycol as the reducing agent, H₂PtCl₆ as a precursor of Pt and CuSO₄ as a precursor of Cu. At the appropriate temperature and pH (adjusted by KOH/EG solution), Cu nanoparticles were reduced on the surface of MWCNTs (140 ℃, pH＝10), and then Pt atoms were deposited on the surface of Cu nanoparticles (90 ℃, pH＝7～8). α-MnO₂ and β-MnO₂ were prepared by hydrothermal method with KMnO₄ and Mn(NO₃)₂ as the manganese source, the reaction time of α-MnO₂ and β-MnO₂ is 8 h and 72 h, respectively. The obtained manganese dioxide was doped onto Cu@Pt/MWCNT under ultrasound to make Cu@Pt/MWCNTs-MnO₂ composite catalysts. The structure and morphology of Cu@Pt/MWCNTs and MnO₂ were characterized by XRD, SEM and TEM, electrochemical performances were investigated by cyclic voltammetry, cathodic polarization and other electrochemical methods. In order to discuss the oxygen reduction method of Cu@Pt/MWCNTs-MnO₂, RRDE (rotating ring-disk electrode) was further used to examine the catalytic oxygen reduction reactions of Cu@Pt/MWCNTs-MnO₂. Our results demonstrated that the Cu@Pt nanoparticles have the core-shell structure. The diameter of the nanoparticles is about 6～8 nm. The crystal morphology of MnO₂ is α-MnO₂ and β-MnO₂. It was also found that the Cu@Pt/MWCNTs-β-MnO₂ composite catalysts have better catalytic performance and higher electrochemical activity surface (up to 71.1 m²·g^-1). The RRDE results for the ORR indicate that, the main reaction of Cu@Pt/MWCNTs-β-MnO₂ catalyst is the direct reduction of O₂ to H₂O which is same as the mechanism of Cu@Pt/MWCNTs catalyst, both with a four-electron charge transfer. Moreover, the mechanism of MnO₂-promoting effects for the oxygen reduction was also discussed in this paper.

Key words: PEMFC core-shell, manganese dioxide, electrocatalyst, oxygen reduction, electrochemical active surface

Cite this article

Yu Shuping, Lou Qun, Liu Runting, Han Kefei, Wang Zhongming, Zhu Hong. Synthesis and Electrocatalytic Performance of Cu@Pt/MWCNTs-MnO₂ Electrocatalyst[J]. Acta Chimica Sinica, 2012, 70(22): 2359-2364.

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Cu@Pt/MWCNTs-MnO₂电催化剂的制备及电催化性能研究

Synthesis and Electrocatalytic Performance of Cu@Pt/MWCNTs-MnO₂ Electrocatalyst

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Cu@Pt/MWCNTs-MnO2电催化剂的制备及电催化性能研究