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首页> 外文期刊>Applied Surface Science >Highly active dealloyed Cu@Pt core-shell electrocatalyst towards 2-propanol electrooxidation in acidic solution
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Highly active dealloyed Cu@Pt core-shell electrocatalyst towards 2-propanol electrooxidation in acidic solution

机译：高活性脱铝Cu @ Pt核壳电催化剂在酸性溶液中对2-丙醇的电氧化

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摘要

Dealloyed Cu@Pt core-shell electrocatalyst was fabricated by cyclic co-electrodeposition and selective Cu dealloying (CCEd-sCuD) on carbon paper (CP), namely Cu@Pt/CP. The Cu@Pt/CP exhibited a core-shell structure comprising with a Cu-rich core and a Pt-rich shell. The crystalline phases of Pt/CP and Cu@Pt/CP were a face-centered cubic (fcc). The compressive lattice strain approximately 0.85% was found in the Cu@Pt/CP owing to a lattice mismatch between a core and a shell region. In the core-region, Cu was formed Pt-Cu alloy as major and copper oxide and also metallic copper as minor. The morphology and grain size of the Cu@Pt/CP displayed a porous spherical shape with 100 nm in diameter, while those of Pt/CP seemed to be a cubic shape with smaller diameter of 40 nm. In electrochemical and catalytic activity, the surface of Cu@Pt/CP had a larger electrochemical active surface area (ECSA) than that of Pt/CP due to a porous formation caused by Cu dealloying. It is not surprising that the Cu@Pt/CP showed higher catalytic activity and greater stability towards 0.5 M 2-propanol electrooxidation in 0.5 M H-2 SO4 in terms of peak current density (j(p)), peak potential (E-r), onset potential (E-onset), diffusion coefficient (D), and charge transfer resistance (R-ct) which were caused by electronic structure modification, higher compressive lattice strain, and larger ECSA, compared with Pt/CP. (C) 2016 Elsevier B.V. All rights reserved.
机译：通过在碳纸（CP）上进行循环共电沉积和选择性铜脱合金（CCEd-sCuD）制备脱合金的Cu @ Pt核壳电催化剂，即Cu @ Pt / CP。 Cu @ Pt / CP显示出核-壳结构，其包含富Cu核和富Pt壳。 Pt / CP和Cu @ Pt / CP的结晶相为面心立方（fcc）。由于核和壳区域之间的晶格失配，在Cu @ Pt / CP中发现了约0.85％的压缩晶格应变。在芯区中，形成了以Pt-Cu合金为主要成分和氧化铜以及金属铜为次要成分的Cu。 Cu @ Pt / CP的形貌和晶粒尺寸显示出直径为100 nm的多孔球形，而Pt / CP的形貌和晶粒似乎为直径小于40 nm的立方体形状。在电化学和催化活性方面，Cu @ Pt / CP的表面具有比Pt / CP更大的电化学活性表面积（ECSA），这是由于Cu脱合金引起的多孔形成。毫不奇怪，Cu @ Pt / CP在峰值电流密度（j（p）），峰值电势（Er）方面表现出更高的催化活性和在0.5 M H-2 SO4中对0.5 M 2-丙醇电氧化的更大稳定性。与Pt / CP相比，由电子结构改性，较高的压缩晶格应变和较大的ECSA引起的起始电位（E-起始），扩散系数（D）和电荷转移阻力（R-ct）。 （C）2016 Elsevier B.V.保留所有权利。

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