A kinetically well-matched full-carbon sodium-ion capacitor
Literature Information
Kangyu Zou, Peng Cai, Cheng Liu, Jiayang Li, Xu Gao, Laiqiang Xu, Guoqiang Zou, Hongshuai Hou, Zuming Liu, Xiaobo Ji
Sodium-ion capacitors (SICs), as new-generation electrochemical energy-storage systems, have combined the advantages of high energy and power densities, meeting the urgent demand for versatile electronic equipment and grid energy-storage stations. Nevertheless, the electrochemical performance of SICs is seriously restricted by the kinetic mismatch between the battery-type anode and capacitor-type cathode. In this work, N-doped 3D carbon (NHPC) delivered a high reversible specific capacity of 197 mA h g−1 at 2 A g−1, and the mechanism of its electrochemistry mainly involved strong pseudocapacitive storage that promoted quick physical adsorption/desorption. Moreover, further activation of NHPC yielded nitrogen-doped hierarchical porous activated carbon (NHPAC), which displayed a large specific surface area of 1478 m2 g−1 with abundant meso/macropores, and brought about fast adsorption/desorption of anions on its surface. The full-carbon SIC device benefitted from the similar material systems used for its anode and cathode, and hence achieved a high energy density of 115 W h kg−1 at 200 W kg−1 as well as long-term cyclability in the potential range of 0–4.0 V. This rational strategy of kinetic matching might open up a potential avenue for the development of additional advanced SICs.
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Journal of Materials Chemistry A

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment










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