Abstract
Highly efficient, clean, and sustainable electrochemical energy storage technologies have been investigated extensively to counter the shortage of fossil fuels and increasingly prominent environmental problems. Supercapacitors (SCs) have received wide attention as critical devices for electrochemical energy storage because of their rapid charging–discharging capability and long life cycle. Various transition metal oxides (TMOs), such as MnO2, NiO, Co3O4, and CuO, have been extensively studied as electrode materials for SCs. Compared with carbon and conducting polymers, TMO materials can achieve higher specific capacitance. For further improvement of electrochemical performance, hierarchically nanostructured TMO materials have become a hot research area for electrode materials in SCs. The hierarchical nanostructure can not only offer abundant accessible electroactive sites for redox reactions but also shorten the ion diffusion pathway. In this review, we provide an overall summary and evaluation of the recent progress of hierarchically nanostructured TMOs for SCs, including synthesis methods, compositions, structures, and electrochemical performances. Both single-phase TMOs and the composites based on TMOs are summarized. Furthermore, we also prospect the developing foreground of this field. In this view, the important directions mainly include: the nanocomposites of TMOs materials with conductive materials; the cobalt-based materials and the nickel-based materials; the improvement of the volume energy density, the asymmetric SCs, and the flexible all-solid-state SCs.
摘要
为了应对化石燃料短缺与日益严重的环境污染问题, 开发高效、清洁、可持续的电化学储能技术已迫在眉睫. 超级电容器, 由于其 功率密度高、充放电时间短、循环寿命长等特点, 已得到广泛关注. 多种过渡金属氧化物已被作为超级电容器电极材料进行了深入研究. 为了进一步提高性能, 具有多级纳米结构的过渡金属氧化物材料已成为目前超级电容器领域的研究热点. 多级纳米结构不仅可以为电化 学反应提供更多活性位点, 同时还可以缩短离子的传输路径. 本综述对多级纳米结构过渡金属氧化物在超级电容器电极材料方面的应用, 进行了系统的总结与评价, 主要包括: 合成方法、成分、结构和电化学性能. 此外, 对该领域的进一步发展进行了展望.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51202106, 21671170 and 21673203) and New Century Excellent Talents of the University in China (NCET-13-0645), the Innovation Scientists and Technicians Troop Construction Projects of Henan Province (164200510018), the Plan for Scientific Innovation Talent of Henan Province, the Program for Innovative Research Team (in Science and Technology) in the University of Henan Province (14IRTSTHN004 and 16IRTSTHN003), the Science & Technology Foundation of Henan Province (122102210253 and 13A150019), the Science & Technology Foundation of Jiangsu Province (BK20150438), the Six Talent Plan (2015-XCL-030), and China Postdoctoral Science Foundation (2012M521115). We also acknowledge the Priority Academic Program Development of Jiangsu Higher Education Institutions and the technical support we received at the Testing Center of Yangzhou University.
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Mingbo Zheng received his PhD in material processing engineering from Nanjing University of Aeronautics and Astronautics in 2009. He was a postdoctoral researcher at Nanjing University from 2009 to 2012. He was an associate researcher at Nanjing University from 2012 to 2015. He is currently an associate professor at Yanzhou University. His research interests are in the field of materials for electrochemical energy storge, including supercapacitor, lithium-ion battery, and lithium-sulfur battery.
Huan Pang received his PhD degree from Nanjing University in 2011. He then founded his research group in Anyang Normal University where he was appointed as a distinguished professor in 2013. He has now jointed Yangzhou University as a University Distinguished Professor. His research interests include the development of inorganic nanostructures and their applications in flexible electronics with a focus on energy devices.
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Zheng, M., Xiao, X., Li, L. et al. Hierarchically nanostructured transition metal oxides for supercapacitors. Sci. China Mater. 61, 185–209 (2018). https://doi.org/10.1007/s40843-017-9095-4
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DOI: https://doi.org/10.1007/s40843-017-9095-4