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Carbon Nanotubes as a Secondary Support of Catalyst Layer in Oxygen Diffusion Electrode and Their Electrochemical Properties
Huang Hui*1, Zhang Wenkui1, Gan Yongping1, Zhang Xiaobin2, Tu Jiangping2
1.College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032;2.College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027
Abstract:
A novel gas diffusion electrode using binary carbon supports (carbon nanotubes and active carbon) as the catalyst layer was prepared. The electrochemical properties for oxygen reduction reaction (ORR) in alkaline electrolyte were investigated by polarization curves and electrochemical impedance spectroscopy. The results show that the binary-support electrode exhibits higher electrocatalytic activity than the single-support electrode, and the best performance is obtained when the mass ratio of carbon nanotubes and activated carbon is 50 ∶50. The results from their electrode kinetic parameters indicate that the introduction of carbon nanotubes as a secondary support provides high accessible surface area, good electronic conductivity and fast ORR kinetics. The electrocatalytic activity of binary-support electrodes is obviously improved by the deposition of Pt nanoparticles on carbon nanotubes, even at very low Pt loading (45.7 μg/cm2). In addition, the EIS analysis results show that the process of ORR may be controlled by diffusion of oxygen in the thin film for binary-support electrodes with or without Pt catalyst.
Key words:  Carbon nanotubes, Gas diffusion electrode, Oxygen reduction, Electrochemical property
FundProject:
附件
纳米碳管作为氧扩散电极催化层第二相碳载体的电极特性
黄辉*1, 张文魁1, 甘永平1, 张孝彬2, 涂江平2
1.浙江工业大学化工与材料学院,杭州,310032;2.浙江大学材料与化工学院,杭州,310027
摘要:
以纳米碳管和活性碳二元碳材料为催化层碳载体制备了氧扩散电极,采用稳态极化和电化学阻抗技术对其在碱性介质中氧还原反应的电催化活性进行了研究.结果表明,双载体电极比单载体纳米碳管、活性炭电极具有更高的电催化活性,纳米碳管和活性炭质量比为50∶50时双载体电极的催化活性最好;电极动力学参数测试表明,催化层中引入第二相纳米碳管载体提高了电极比表面积、电子导电性和氧还原反应速度;采用浸渍还原法在第二相纳米碳管载体中负载纳米级Pt催化剂,即使在低Pt负载量下(45.7 μg/cm2)也明显改善了双载体电极的催化活性.
关键词:  纳米碳管  气体扩散电极  氧还原  电化学性能
DOI:10.1088/1674-0068/18/3/428-432
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