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Enhanced electrocatalytic performance of ultrathin PtNi alloy nanowires for oxygen reduction reaction

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Abstract

In this paper, ultrathin Pt nanowires (Pt NWs) and PtNi alloy nanowires (PtNi NWs) supported on carbon were synthesized as electrocatalysts for oxygen reduction reaction (ORR). Pt and PtNi NWs catalysts composed of interconnected nanoparticles were prepared by using a soft template method with CTAB as the surface active agent. The physical characterization and electrocatalytic performance of Pt NWs and PtNi NWs catalysts for ORR were investigated and the results were compared with the commercial Pt/C catalyst. The atomic ratio of Pt and Ni in PtNi alloy was approximately 3 to 1. The results show that after alloying with Ni, the binding energy of Pt shifts to higher values, indicating the change of its electronic structure, and that Pt3Ni NWs catalyst has a significantly higher electrocatalytic activity and good stability for ORR as compared to Pt NWs and even Pt/C catalyst. The enhanced electrocatalytic activity of Pt3Ni NWs catalyst is mainly resulted from the downshifted-band center of Pt caused by the interaction between Pt and Ni in the alloy, which facilitates the desorption of oxygen containing species (Oads or OHads) and the release of active sites.

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Acknowledgements

This work is financially supported by The National Key Research and Development Program of China (Grant No. 2016YFB0101208) and National Natural Science Foundation of China (Grant No.U1508202 and No.61433013).

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Correspondence to Zhigang Shao.

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Zhang, H., Zeng, Y., Cao, L. et al. Enhanced electrocatalytic performance of ultrathin PtNi alloy nanowires for oxygen reduction reaction. Front. Energy 11, 260–267 (2017). https://doi.org/10.1007/s11708-017-0499-x

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  • DOI: https://doi.org/10.1007/s11708-017-0499-x

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