Dealloyed ternary Cu@Pt-Ru core-shell electrocatalysts supported on carbon paper for methanol electrooxidation catalytic activity
| Autor: | Somsak Dangtip, Chatwarin Poochai, Ekasith Somsook, Waret Veerasai |
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| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Scanning electron microscope General Chemical Engineering Analytical chemistry 02 engineering and technology Chronoamperometry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Dielectric spectroscopy X-ray photoelectron spectroscopy Electrochemistry Crystallite Cyclic voltammetry 0210 nano-technology Ternary operation Spectroscopy |
| Zdroj: | Electrochimica Acta. 222:1243-1256 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2016.11.098 |
| Popis: | 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.mg Pt −1 , which is significantly higher than that of dealloyed binary Cu@Pt/CP (211 mA.mg Pt −1 ) and pure Pt/CP (170 mA.mg Pt −1 ). The highest current stability is found for the ternary Cu@Pt-Ru/CP with decay rate at 2.3 × 10 −3 mA.mg Pt −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 (J P ) of the ternary Cu@Pt-Ru/CP suggests lower intrinsic reactivity. |
| Databáze: | OpenAIRE |
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