Publication: Dealloyed ternary Cu@Pt-Ru core-shell electrocatalysts supported on carbon paper for methanol electrooxidation catalytic activity
Issued Date
2016-12-20
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00134686
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2-s2.0-85007240820
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Mahidol University
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SCOPUS
Bibliographic Citation
Electrochimica Acta. Vol.222, (2016), 1243-1256
Suggested Citation
Chatwarin Poochai, Waret Veerasai, Ekasith Somsook, Somsak Dangtip Dealloyed ternary Cu@Pt-Ru core-shell electrocatalysts supported on carbon paper for methanol electrooxidation catalytic activity. Electrochimica Acta. Vol.222, (2016), 1243-1256. doi:10.1016/j.electacta.2016.11.098 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/43300
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Title
Dealloyed ternary Cu@Pt-Ru core-shell electrocatalysts supported on carbon paper for methanol electrooxidation catalytic activity
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Abstract
© 2016 Elsevier Ltd Dealloyed ternary Cu@Pt-Ru core-shell electrocatalysts supported on carbon paper (CP) are fabricated by cyclic-co-electrodeposition and selective copper dealloying (CCED-SCuD). The physical properties of this catalyst such as surface and bulk compositions, electronic structure modification, phase structure, crystallite size, compressive lattice strain, and morphology were characterized by X-ray photoemission (XPS), inductive-coupling plasma atomic spectroscopy (ICP-AES), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), scanning electron microscope, and transmission electron microscope (TEM). The best catalyst is Cu@Pt-Ru/CP, having core-shell structure with a Cu rich core and a Pt-Ru rich shell with grain size around 100 nm. Cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) reveal that ternary Cu@Pt-Ru/CP gives significantly low onset potential and high activity towards methanol electrooxidation reaction (MOR), achieving specific peak current at 265 mA.mgPt−1, which is significantly higher than that of dealloyed binary Cu@Pt/CP (211 mA.mgPt−1) and pure Pt/CP (170 mA.mgPt−1). The highest current stability is found for the ternary Cu@Pt-Ru/CP with decay rate at 2.3 × 10−3 mA.mgPt−1.s−1. The enhancements of both activity and stability of the Cu@Pt-Ru/CP from the higher electrochemical surface area (ECSA) are major reason, which originates from the higher exposed surface of Pt, while the higher compressive lattice strain, electronic structure modification, and bi-functional mechanism are minor reason. However, the lower current density (JP) of the ternary Cu@Pt-Ru/CP suggests lower intrinsic reactivity.