SC-IrO2NR-carbon hybrid: A catalyst with high electrochemical stability for oxygen reduction |
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Authors: | GuangJin Wang Feng Cheng Yi Yu Cong Liang Tian Xu Mu Pan |
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Affiliation: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China 2. Hubei Provincial Key Laboratory of Fuel Cell, Wuhan, 430070, China
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Abstract: | The enhanced electrochemical stability of the synthesized hybrid catalyst has been demonstrated by the introduction of the synergistic effect between carbon powder additive and the prepared catalyst. Single crystal IrO2 nanorod (SC-IrO2NR) catalyst was prepared by a sol-gel method. The structure and performance of the catalyst sample were characterized by X-ray diffraction spectroscopy (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), rotating disk electrode (RDE) and cyclic voltammetry (CV) measurements. XRD patterns and TEM images indicate that the catalyst sample has a rutile IrO2 single crystal nanorod structure. The onset potential for oxygen reduction reaction (ORR) of the SC-IrO2NR-carbon hybrid catalyst specimen is 0.75 V (vs. RHE) in RDE measurement. CV and RDE test results show that the SC-IrO2NR-carbon hybrid catalyst has a better electrochemical stability in comparison with the commercial Pt/C catalyst, with attenuation ratios of 17.67% and 44.60% for the SC-IrO2NR-carbon hybrid catalyst and the commercial Pt/C catalyst after 1500 cycles, respectively. Therefore, in terms of stability, the SC-IrO2NR-carbon hybrid catalyst has a promising potential in the application of the proton exchange membrane fuel cell. |
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