Carbon Dots: Preparation and Their Application in Electrocatalytic Oxygen Reduction

IF 3.2 4区 工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY
Lamei Zhang, Jin Wang, Jing Zhang, Yingfang Xie, Zijiong Li
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引用次数: 0

Abstract

Carbon dots (CDs), as emerging zero-dimensional carbon- based nanomaterials, have demonstrated significant potential in the field of electrocatalytic oxygen reduction reaction (ORR) in recent years. This article systematically reviews the breakthrough progress in CD preparation techniques and their innovative applications in ORR catalysis. In terms of preparation, the optimization strategies of top–down methods (arc discharge, laser ablation, electrochemical exfoliation, ultrasonic method) and bottom-up methods (combustion method, template method, hydrothermal synthesis, microwave-assisted,) are analyzed in detail. For example, CDs prepared by the nitrogen-doped hydrothermal method achieved a quantum yield of 80%, while the electrochemical method enabled the controllable preparation of 2.8 nm monodispersed CDs. Regarding ORR applications, the following findings have been reported: (1) Boron-nitrogen co-doped CDs (BN-CDs) exhibited an onset potential of 0.985 V and a limiting current density of 4.32 mA cm⁻2, outperforming commercial Pt/C catalysts; (2) Iron-loaded CDs (Fe-CQDs) had an electron transfer number of 3.96 and a hydrogen peroxide yield of only 2.17% in acidic media; (3) The fluorine-nitrogen co-doped system (C-GQD) increased the half-wave potential to 0.81 V by modulating the d-band center. These breakthroughs are attributed to the unique surface defect structure and tunable electron distribution characteristics of CDs. This review systematically analyzes the performance-enhancing strategies for CD-based electrocatalysts, discusses existing challenges, such as low yields and unclear catalytic mechanisms; and proposes future development directions including interface engineering and atomic-level doping. This study provides important theoretical guidance and technical references for the design of efficient CD-based ORR catalysts.

碳点的制备及其在电催化氧还原中的应用
碳点(CDs)作为新兴的零维碳基纳米材料,近年来在电催化氧还原反应(ORR)领域显示出巨大的潜力。本文系统地综述了CD制备技术的突破性进展及其在ORR催化中的创新应用。在制备方面,详细分析了自上而下的方法(电弧放电、激光烧蚀、电化学剥离、超声波法)和自下而上的方法(燃烧法、模板法、水热法、微波辅助法)的优化策略。例如,氮掺杂水热法制备的CDs量子产率达到80%,而电化学法制备的单分散CDs则可实现2.8 nm的可控制备。在ORR应用方面,有以下发现:(1)硼氮共掺杂CDs (BN-CDs)的起始电位为0.985 V,极限电流密度为4.32 mA cm - 2,优于商业Pt/C催化剂;(2)铁负载CDs (Fe-CQDs)在酸性介质中的电子转移数为3.96,过氧化氢产率仅为2.17%;(3)氟氮共掺杂体系(C-GQD)通过调制d波段中心,将半波电位提高到0.81 V。这些突破归功于cd独特的表面缺陷结构和可调谐的电子分布特性。本文系统地分析了基于cd的电催化剂的性能提升策略,讨论了目前存在的挑战,如低收率和催化机理不明确;并提出了今后的发展方向,包括界面工程和原子级掺杂。该研究为高效cd基ORR催化剂的设计提供了重要的理论指导和技术参考。
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
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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