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The enhanced oxygen reduction reaction performance on PtSn nanowires: the importance of segregation energy and morphological effect

Abstract

In this study, the reaction mechanism and electrochemical properties of carbon-supported PtSn nanomaterials including nanoparticles and nanowires (NWs) toward oxygen reduction reaction (ORR) have been investigated computationally and experimentally. Segregation energy calculation was applied to screen out the unique thermodynamic stability of PtSn under ORR operation. Materials chemistry processing was further utilized to tailor the morphologies of PtSn NWs that have shown promoted ORR stability when compared to Pt NWs (24 vs 83 % in decay during durability tests of 10000 cycles). Additionally, those PtSn NWs with Pt rich in the inner core and Sn rich on the outer shell structure also showed the enhancement in ORR activity from electrochemical tests. The enhanced performance, which has been rationalized from the computation and various experimental techniques of high resolution transmission electron microscopy, X-ray diffraction, X-ray photoemission spectroscopy and X-ray absorption spectroscopy, can be attributed to Sn and its oxides induced change of electronic structures and the morphological effects, which not only reduce oxophilicity and d-band center of surface Pt but also stabilize the structure during durability test.

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Publication details

The article was accepted on 13 Jun 2017 and first published on 15 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA03735J
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    The enhanced oxygen reduction reaction performance on PtSn nanowires: the importance of segregation energy and morphological effect

    Y. Guo, S. Yan, C. Liu, T. Chou, J. Wang and K. Wang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03735J

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