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Shaik Gouse Peera, Shaik Ashmath, Seung Won Kim, Tae-Gwan Lee, Myunghwan Byun, and Chao Liu, Self-supported metal aerogel electrocatalysts for oxygen reduction reaction: Opportunities and challenges, Int. J. Miner. Metall. Mater., (2026). https://doi.org/10.1007/s12613-026-3386-9
Shaik Gouse Peera, Shaik Ashmath, Seung Won Kim, Tae-Gwan Lee, Myunghwan Byun, and Chao Liu, Self-supported metal aerogel electrocatalysts for oxygen reduction reaction: Opportunities and challenges, Int. J. Miner. Metall. Mater., (2026). https://doi.org/10.1007/s12613-026-3386-9
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用于氧还原反应的自支撑金属气凝胶电催化剂:机遇与挑战

摘要: 开发出高效且稳定的用于氧气还原反应(ORR)的电催化剂,对于提高燃料电池的效率而言仍是一项具有挑战性的任务。尽管铂(Pt)以及基于铂与过渡金属合金的催化剂被认为是实用的选择,但它们存在铂利用率低和稳定性差的问题。在这方面,具有高导电性、纯金属性质、分层三维多孔结构以及纳米线气凝胶的自支撑电催化剂在近几十年来引起了人们的关注。金属气凝胶被视为高效的催化材料,尤其是在电催化方面,因为它们融合了金属和多孔气凝胶的独特特性。在这篇综述中,我们概述了金属气凝胶催化剂在 ORR 方面的最新进展。金属气凝胶催化剂因其出色的内在活性而表现出优异的 ORR 活性,这种活性源于出色的铂利用率以及由于其金属性质而暴露的活性位点。由于其高铂利用率,一些贵金属气凝胶催化剂被发现比传统的铂/碳催化剂具有更高的质量活性,在相对于参考极化电位 0.9 V 的条件下,其质量活性目标值可达 440 A/g,这表明金属气凝胶作为燃料电池的氧还原反应(ORR)催化剂具有很高的潜力。在此,我们总结了金属气凝胶催化剂用于氧还原反应的近期基准研究结果,它们对催化剂层的微观结构、燃料电池性能的影响,以及最近报道的金属气凝胶催化剂的前沿改进。我们系统地回顾了金属气凝胶催化剂合成的各种方面、其相对于传统铂/碳催化剂的优势、ORR 动力学,并提供了进一步改进和将金属气凝胶催化剂整合到实际燃料电池中的未来研究方向和建议。

 

Self-supported metal aerogel electrocatalysts for oxygen reduction reaction: Opportunities and challenges

Abstract: The development of highly active and stable electrocatalysts for the oxygen reduction reaction (ORR) remains a challenging task for improving the efficiency of fuel cells. Although Pt and Pt–transition metal alloy-based catalysts stand out as practical choices, they suffer from poor Pt utilization and stability. In this regard, highly electrically conducting, purely metallic, hierarchical 3D-porous, and nanowire aerogels as self-supported electrocatalysts have gained interest in recent decades. Metal aerogels are regarded as efficient catalytic materials, especially for electrocatalysis, as they integrate the unique features of both metallic and porous aerogels. In this review, we provide an overview of the recent progress in metal aerogel catalysts for ORR. Metal aerogel catalysts exhibit excellent ORR activity due to their high intrinsic activity arising from excellent Pt utilization and the exposure of active sites due to their metallic nature. Owing to their high Pt utilization, several noble metal aerogel catalysts were found to exhibit higher mass activity than traditional Pt/C catalysts and a mass activity target of 440 A per g Pt at 0.9 V vs. RHE, suggesting the high potential of metal aerogels as ORR catalysts in fuel cells. Herein, we summarize the recent benchmark research outcomes of metal aerogel catalysts for the ORR, their effects on the microstructure of catalyst layers, fuel cell performance, and cutting-edge modifications of recently reported metal aerogel catalysts. We systematically review the various aspects of metal aerogel catalyst synthesis, their advantages over traditional Pt/C catalysts, and ORR kinetics, and provide future research directions and recommendations to further improve and integrate metal aerogel catalysts into realistic fuel cells.

 

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