Abstract
For energy storage system, it is still a huge challenge to achieve high energy density and high power density simultaneously. One potential solution is to fabricate electrochemical capacitors (ECs), which store electric energy through surface ion adsorption or redox reactions. Here we report a new electrode material, heavy nitrogen-doped (9.29 at.%) black titania (TiO2−x:N). This unique hybrid material, consisting of conductive amorphous shells supported on nanocrystalline cores, has rapid N-mediated redox reaction (TiO2−xNy + zH+ + ze− ↔ TiO2−xNyHz), especially in acidic solutions, providing a specific capacitance of 750 F g−1 at 2 mV s−1 (707 F g−1 at 1 A g−1), great rate capability (503 F g−1 at 20 A g−1), and maintain stable after initial fading. Being a new developed supercapacitor material, nitrogen-doped black titania may revive the oxide-based supercapacitors.
摘要
对于储能系统, 同时实现高能量密度和高功率密度仍是一个 巨大的挑战. 电化学超级电容器通过表面吸附或表面氧化还原反 应实现储能, 是解决上述问题的潜在方法之一. 本论文报道了一种 新型高氮掺杂(9.29 at.%)黑色二氧化钛(TiO2−x:N)超级电容器电极 材料. 该材料具有独特的微观结构, 由高导电的非晶壳层和一个纳 米晶核组成. 在酸性电解液中, 该材料可以通过氮参与的氧化还原 反应(TiO2−xNy + zH+ + ze− ↔ TiO2−xNyHz)可逆地与质子结合实现 能量的高效快速储存, 实现极高的比电容(2 mV s−1扫速下容量高 达750 F g−1, 1 A g−1电流密度下容量可达707 F g−1)、高倍率特性 (极高电流密度20 A g−1时容量仍可达503 F g−1)和长时间循环下的 高稳定性. 作为一种新型超级电容器电极材料, 氮掺杂黑色二氧化 钛或将引领金属氧化物型超级电容器的复兴.
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Acknowledgements
This work was financially supported by the National key R&D Program of China (2016YFB0901600), and the Key Research Program of Chinese Academy of Sciences (QYZDJ-SSWJSC013). Chen IW was supported by U.S. Department of Energy BES grant DE-FG02-11ER46814 and used the facilities (Laboratory for Research on the Structure of Matter) supported by NSF grant DMR-11-20901.
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Yang C, Huang F, and Chen IW designed the experiment; Yang C, Wang X, Xu J, and Wang Z engineered the samples and the tests; Gu H performed the SEM and TEM tests. Yang C, Wang X, and Dong W analyzed the data. Yang C and Dong W wrote the paper with support from Huang F. All authors contributed to the general discussion.
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The authors declare that they have no conflict of interest.
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Chongyin Yang obtained his PhD under the supervision of Prof. Fuqiang Huang at Shanghai Institute of Ceramics of the Chinese Academy of Sciences (SICCAS). He is now an assistant research scientist at the Department of Chemistry and Biochemistry, University of Maryland. His research interests include the design, synthesis and application of supercapacitors and lithiumion batteries.
Fuqiang Huang obtained his PhD in science from Beijing Normal University in 1996. Then he joined the State Key Lab of High Performance Ceramics & Superfine Microstructure at SICCAS, and became a full professor in 2003. His research interests focus on the new energy materials and devices. He put forward the concept of multiple physical quantities synergy in structure function region for energy conversion materials and the theoretical model of accumulation factor.
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Yang, C., Wang, X., Dong, W. et al. Nitrogen-doped black titania for high performance supercapacitors. Sci. China Mater. 63, 1227–1234 (2020). https://doi.org/10.1007/s40843-020-1303-4
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DOI: https://doi.org/10.1007/s40843-020-1303-4