电催化剂
塔菲尔方程
限制电流
甲醇
电化学
材料科学
合金
催化作用
化学工程
化学
无机化学
电极
冶金
物理化学
有机化学
工程类
作者
Rashmi Chetry,Bhugendra Chutia,Suranjana Patowary,Biraj Jyoti Borah,Putla Sudarsanam,Pankaj Bharali
出处
期刊:Energy & Fuels
[American Chemical Society]
日期:2023-06-19
卷期号:37 (13): 9557-9567
标识
DOI:10.1021/acs.energyfuels.3c00452
摘要
Pd-based electrocatalysts are considered as suitable replacement for Pt-based ones owing to the similar electronic structure of Pd, relatively low cost, and superior catalytic performance. The activity and utilization efficiency of Pd in electrochemical reactions can be increased by alloying with transition metals, like Cu and Co. Herein, we report the synthesis of a homogeneously embedded Pd2CuCo alloy in the carbon matrix. Compared with the benchmark Pt/C, the as-synthesized Pd alloy electrocatalyst exhibited an improved limiting current density (Jm; −5.65 mA cm–2), a smaller Tafel slope (58.7 mV dec–1), and a comparable onset potential (Eonset; 0.91 V vs RHE). Comparatively, the optimized Pd2CuCo showed a current retention of ∼96% after a 6 h stability test and only a 4 mV loss in the half-wave potential (E1/2) after 10,000 redox cycles, while Pt/C showed a current retention of 72.5% and a loss of 5 mV in E1/2. Meanwhile, the Pd2CuCo alloy electrocatalyst also demonstrated excellent methanol tolerance compared to benchmark Pt/C. In addition, the electrocatalyst showed higher activity and long-term stability toward the formic acid oxidation reaction than Pd/C, signifying the potential for wide applicability.
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