Carbon-Capped PtNi Catalysts for the Oxygen Reduction Reaction in Acidic Environment: A Durability Study

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2024-10-28 DOI:10.1007/s12678-024-00904-8

Quentin Labarde, Andres O. Godoy, Laetitia Dubau, Fabrice Micoud, Marian Chatenet

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Abstract

Protective-shell catalysts (particularly carbon-capped catalysts) may increase the durability of oxygen reduction catalysts, owing to their supposed anti-degradation effect. The mechanisms promoting this effect are still questioned and further scientific scrutiny is needed to better understand their underlying principle. In this paper, three carbon-capped PtNi/C catalysts with different extents of carbon cap graphitization were synthesized via a one-pot heat treatment. A precise electrochemical activation was applied, leading to similar intrinsic ORR activity than for a commercial Pt₃Ni/VC benchmark catalyst and larger activity than for the mother platinum nanoparticles supported on graphitized carbon (Pt/Gr.C) catalyst. To examine their robustness once fully activated, an aggressive accelerated stress test (AST) designed to emphasize Pt dissolution/redeposition, was performed and coupled with post mortem analyses. The carbon-capped catalyst with the most graphitized shell is able to withstand the AST: its Pt nanoparticle size is less affected than for uncapped catalysts, suggesting a positive action of the protective carbon cap.

Graphical Abstract

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碳帽PtNi催化剂在酸性环境下氧还原反应的耐久性研究

保护壳催化剂（特别是碳帽催化剂）可能会增加氧还原催化剂的耐久性，因为它们具有抗降解作用。促进这种效应的机制仍然受到质疑，需要进一步的科学审查以更好地理解其潜在原理。本文通过一锅热处理，合成了3种碳帽石墨化程度不同的碳帽PtNi/C催化剂。采用精确的电化学活化，得到了与商用Pt3Ni/VC基准催化剂相似的ORR活性，并且比石墨化碳（Pt/Gr.C）催化剂上的母铂纳米颗粒活性更高。为了检验其完全激活后的稳健性，进行了一项旨在强调铂溶解/再沉积的加速压力测试（AST），并结合尸检分析。具有最石墨化外壳的碳帽催化剂能够承受AST：其Pt纳米颗粒尺寸受到的影响小于未封顶的催化剂，表明保护碳帽的积极作用

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

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