Enhanced ORR kinetics and stability through synergy of Pt-Ni clustering and porous N-doped C/Ca aerogel support

IF 3.8 3区工程技术 Q3 ENERGY & FUELS Chemical Engineering and Processing - Process Intensification Pub Date : 2024-09-18 DOI:10.1016/j.cep.2024.109999

Muhammad Umair Mushtaq , Zhu Lin , Danni Li , Khurram Shahzad Ayub , Zain Abbas , Waqas Qamar Zaman , Ji Yang

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Abstract

The oxygen reduction reaction (ORR) is fundamental in numerous electrochemical energy conversion technologies, necessitating efficient catalysts to enhance reaction kinetics and reduce precious metal usage. This study focuses strategic clustering of Pt-Ni on Calcium Oxide/activated carbon (C/Ca) aerogels. Electrochemical analyses confirmed that incorporating Ni into Pt matrices significantly enhanced ORR activities with Pt₂₅Ni₇₅-C/Ca composition emerged as optimum. A positive shift in half-wave potential (905 mV vs. RHE) and impressive mass activity (72.50 Ag⁻¹ at 85 V) highlight the potential of this composite as a highly effective and stable ORR catalyst. Pt-C/Ca demonstrated performance fluctuation, while Pt₂₅Ni₇₅-C/Ca showed remarkable stability after 40,000 cycles. Furthermore, C/Ca aerogels exhibited a significantly increased BET surface area, and the presence of Pt-Ni/pyridinic-N species on its surface C/Ca aerogel provided supplementary active sites that facilitated the adsorption and reduction of O₂ during ORR.

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通过铂镍团聚和多孔掺氮 C/Ca 气凝胶支撑的协同作用增强 ORR 动力学和稳定性

氧还原反应（ORR）是众多电化学能量转换技术的基础，需要高效催化剂来提高反应动力学并减少贵金属用量。本研究的重点是氧化钙/活性碳（C/Ca）气凝胶上铂镍的战略聚类。电化学分析证实，在铂基质中加入镍可显著提高 ORR 活性，其中 Pt25Ni75-C/Ca 组成为最佳。半波电位的正移（905 mV vs. RHE）和令人印象深刻的质量活性（85 V 时为 72.50 Ag-1）凸显了这种复合材料作为高效稳定的 ORR 催化剂的潜力。Pt-C/Ca 表现出性能波动，而 Pt25Ni75-C/Ca 则在 40,000 次循环后表现出显著的稳定性。此外，C/Ca 气凝胶的 BET 表面积显著增加，其表面 Pt-Ni/pyridinic-N 物种的存在为 C/Ca 气凝胶提供了补充活性位点，有助于 ORR 过程中 O2 的吸附和还原。

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来源期刊

Chemical Engineering and Processing - Process Intensification 工程技术-工程：化工

CiteScore

7.80

自引率

9.30%

发文量

408

审稿时长

49 days

期刊介绍： Chemical Engineering and Processing: Process Intensification is intended for practicing researchers in industry and academia, working in the field of Process Engineering and related to the subject of Process Intensification.Articles published in the Journal demonstrate how novel discoveries, developments and theories in the field of Process Engineering and in particular Process Intensification may be used for analysis and design of innovative equipment and processing methods with substantially improved sustainability, efficiency and environmental performance.