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Facile Synthesis of Nanoporous Au‐Cu‐Pt Alloy as Superior Catalyst for Methanol Oxidation Reaction
ChemElectroChem ( IF 4.154 ) Pub Date : 2020-01-10 , DOI: 10.1002/celc.201901932
Yunxiang Xie; Can Li; Sara A Razek; Jiye Fang; Nikolay G. Dimitrov

Nanoporous (np) Au‐Cu‐Pt thin‐film catalyst with fine structure and tunable composition is synthesized using a facile method involving successive electrodeposition and de‐alloying. The catalyst’s structure, electronic state, elemental content, and active surface area along with the Pt fraction of it, are characterized and/or determined before and after methanol oxidation reaction (MOR) tests by electrochemical and ultrahigh vacuum analytical routines. The prepared np Au‐Cu‐(8% in the precursor alloy)Pt catalyst exhibits outstanding mass and specific activity toward MOR, which is approximately six‐ and nine‐times, respectively, higher than the activity of a commercial Pt/C(40%) counterpart. A negative 75 mV onset potential shift upon MOR anodic scan on the np Au‐Cu‐(8%)Pt catalyst in comparison with Pt/C(40%) corroborates its higher catalytic activity. Furthermore, the alloy catalyst demonstrates better durability than the Pt/C(40%) counterpart in a three‐hour constant potential test and exhibits full post‐factum recovery of its cycling activity. In addition, it retains more than 60% of its original activity after 3000 cycles of an accelerated degradation test. The outstanding performance is attributed to the specific catalyst’s structure leading to a d‐band upshift along with unique constituent interplay.
更新日期:2020-01-11

 

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