Electrocatalytic properties of PdCeO_x/C anodic catalyst for聽formic acid electrooxidation

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• 作者：Ligang Feng ; Jing Yang ; Yang Hu ; Jianbing Zhu ; Changpeng Liu ; Wei Xing ; ^{xingwei@ciac.jl.cn}
• 关键词：Direct formic acid fuel cells ; Formic acid electrooxidation ; Anodic catalyst ; Pd catalyst
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：March, 2012
• 卷：37
• 期：6
• 页码：4812-4818
• 文件大小：827 K

摘要

The PdCeO_x/C catalyst was prepared and studied as anodic catalyst for formic acid electrooxidation. The morphology, composition and electrocatalytic properties were investigated by transmission electronmicroscopy, energy dispersive X-ray analysis, X-ray diffraction, X-ray photoelectron spectroscopy, the linear sweep voltammetry and chronoamperometry, respectively. The average particle size of Pd nanoparticles for PdCeO_x/C catalyst was about 3.4聽nm with a narrow size distribution. The electrochemical surface area (ESA) of PdCeO_x/C catalyst was larger than the Pd/C catalyst. According to the Tafel plots, the presence of CeO_x in the Pd/C catalyst can accelerate the rate of formic acid electrooxidation. The electrochemical measurements showed that the PdCeO_x/C catalyst exhibited excellent catalytic activity and stability. For example, the peak current of PdCeO_x/C catalyst for formic acid oxidation was about 1.67 times of the Pd/C catalyst and the stable current at 3600聽s of PdCeO_x/C catalyst was about 7 times of the Pd/C catalyst. The promotion effect should be attributed to the larger ESA, the electronic effect and more oxygen-containing species provided by the CeO_x and this catalyst may be used as an effective catalyst for direct formic acid fuel cell.