Abstract
The rational design and facile construction of non-noble metal-based electrocatalysts for efficient oxygen reduction reaction (ORR) remain a challenge for the development of clean energy conversion devices. Herein, we synthesized a new type of hierarchical hollow carbon nanomaterials through one-step pyrolysis on bimetallic ZIF-Zn/Co precursors. The obtained hollow N-doped carbon composites, denoted as HNCT-CNTs, are enriched with Co-Nx sites and in-situ formed multi-walled carbon nanotubes (CNTs). Theoretical and experimental studies confirmed that the obtained HNCT-CNT exhibits excellent ORR catalytic activity with a reduced energy barrier for ORR intermediates. Owing to these advantages, the optimal catalyst shows an excellent half-wave potential of 0.85 V, a limiting current density up to 6.36 mA cm−2, a Tafel slope of 58.2 mV dec−1, and robust stability. Furthermore, the assembled Zn-air battery based on HNCT-CNT also displays an open circuit voltage of 1.49 V and a satisfactory power density of 116.56 mW cm−2. This template-directed preparation method opens up an interesting and efficient route to fabricate highly active non-noble metal-doped carbon nanomaterials for a wide range of electrochemical energy applications.
摘要
设计和制备用于高效氧还原反应(ORR)的非贵金属基电催化剂对于清洁能源转换装置的开发至关重要, 但又极具挑战性. 在本工作中,我们通过热解双金属前驱体ZIF-Zn/Co, 成功制备了一种新型的分级中空碳纳米复合材料HNCT-CNT. 该材料富含Co-N x 位点以及原位形成的多壁碳纳米管. 理论和实验表明, HNCT-CNT使ORR中间体的活化能垒降低, 因而表现出了优异的ORR性能. 最佳催化剂表现出较正的半波电位为0.85 V, 极限电流密度高达6.36 mA cm−2, Tafel斜率为58.2 mV dec−1, 且结构稳定性良好. 此外, 基于HNCT-CNT组装的锌空气电池还显示出1.49 V的开路电压和116.56 mW cm−2的功率密度. 综上, 这种无机物模板法为制备金属有机框架化合物衍生的非贵金属基碳纳米电催化剂用于高效的电化学能源领域提供了一种新的方法.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21601137), the Natural Science Foundation of Zhejiang Province (LQ16B010003), and the Basic Science and Technology Research Project of Wenzhou, Zhejiang Province (G20190007).
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Qian J conceived the idea and supervised the project. Sun Q contributed to the experiments. Chen D conducted the DFT calculations. The paper was primarily written by Qian J and Sun Q. All authors contributed to the general discussion.
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Experimental details and supporting data are available in the online version of the paper.
Qiuhong Sun received her bachelor’s degree from Wenzhou University in 2020, and now she is a graduate student at Wenzhou University. Her current research focuses on the design and synthesis of MOF-derived hierarchically porous materials with silica and oxide templates for electrochemical applications.
Jinjie Qian is an associate professor at the College of Chemistry and Materials Engineering, Wenzhou University. He received his PhD degree from Fujian Institute of Research on the Structure, Chinese Academy of Sciences, under the guidance of Prof. Maochun Hong. His current research is mainly involved in the electrochemical research on the carbon nanomaterials from metal-organic frameworks for energy storage and conversion.
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Sun, Q., Chen, D., Huang, Q. et al. Carbon nanotubes anchored onto hollow carbon for efficient oxygen reduction. Sci. China Mater. 66, 641–650 (2023). https://doi.org/10.1007/s40843-022-2173-3
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DOI: https://doi.org/10.1007/s40843-022-2173-3