通过形貌控制Co/N/C催化剂提高电化学性能:优化电极结构的策略

IF 3.2 4区 工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY
Minhui Kim, Dongyeong Jeong, Seonggyu Lee
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引用次数: 0

摘要

本研究提出了一种新的策略,通过催化剂形态优化来控制碳基非贵金属催化剂(NPMCs)的电极结构,从而提高其电化学应用性能。该方法包括使用钴离子作为交联剂自组装锌基沸石咪唑酸盐框架纳米晶体,然后进行碳化。与形状不规则的Co/N/C催化剂相比,该工艺生产的Co/N/C催化剂具有均匀的尺寸(0.5µm)、明确的结构和显著更高的丝锥密度(1.7 ×)。使用形貌控制催化剂制备的电极在气体扩散电极中表现出优异的氧还原反应(ORR)性能,这归因于电极厚度的减少和传输性能的增强。尽管具有相似的内在动力学活性,但均匀的形貌提高了电子/离子电导率,最小化了质量输运损失,从而提高了催化剂的利用效率。这些发现强调了电极结构在提高碳基催化剂性能方面的关键作用,为燃料电池和电池等能量转换和存储系统提供了有希望的启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhanced Electrochemical Performance Through Morphology-Controlled Co/N/C Catalysts: A Strategy for Optimized Electrode Architecture

This study presents a novel strategy to enhance the performance of carbon-based non-precious metal catalysts (NPMCs) for electrochemical applications by controlling their electrode architecture through catalyst morphology optimization. The approach involves the self-assembly of zinc-based zeolitic imidazolate framework nanocrystals using cobalt ions as crosslinkers, followed by carbonization. This process yields morphology-controlled Co/N/C catalysts with a uniform size (0.5 µm), well-defined structure, and significantly higher tap density (1.7 ×) compared to irregularly shaped Co/N/C catalysts. Electrodes fabricated using the morphology-controlled catalysts demonstrated superior oxygen reduction reaction (ORR) performance in gas diffusion electrodes, attributed to reduced electrode thickness and enhanced transport properties. Despite similar intrinsic kinetic activities, the uniform morphology improved electronic/ionic conductivity and minimized mass transport losses, resulting in higher catalyst utilization efficiency. These findings highlight the critical role of electrode architecture in improving the performance of carbon-based catalysts, offering promising implications for energy conversion and storage systems, such as fuel cells and batteries.

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来源期刊
Korean Journal of Chemical Engineering
Korean Journal of Chemical Engineering 工程技术-工程:化工
CiteScore
4.60
自引率
11.10%
发文量
310
审稿时长
4.7 months
期刊介绍: The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.
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