A novel sintering resistant and corrosion resistant Pt4ZrO2/C catalyst for high temperature PEMFCs |
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| Authors: | Gang Liu Huamin Zhang Hexiang Zhong Jingwei Hu Dongyan Xu |
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| Affiliation: | a Proton Exchange Membrane Fuel Cell Key Materials and Technology Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
b Graduate School of the Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | A novel Pt4ZrO2/C catalyst was prepared and compared with 20 wt.% Pt/C in terms of the sintering resistance and corrosion resistance. To evaluate their sintering resistance and corrosion resistance properties, an accelerated ageing test (AAT) was performed. The catalysts before and after AAT were characterized by cyclic voltammetry (CV), rotating disk electrode (RDE) and X-ray diffraction (XRD). After AAT, the dissolution rate of Pt and Zr in H3PO4 media (105 wt.%, 204 °C) was characterized by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The electrochemical area (ECA) changes of thin film electrodes based on Pt4ZrO2/C and Pt/C catalysts were also evaluated using continuous CV sweep technique. All the results showed that Pt4ZrO2/C has higher sintering resistance and corrosion resistance than Pt/C. ‘Anchor effect’ is proposed to explain the enhanced effect of ZrO2 in Pt4ZrO2/C binary catalyst compared with Pt/C that contain platinum alone. |
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| Keywords: | Pt4ZrO2/C Accelerated ageing test Sintering and corrosion resistance Anchor effect High temperature PEMFCs |
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