Nitrogen-doped porous carbon nanosheets as both anode and cathode for advanced potassium-ion hybrid capacitors

卷:8

Article

关键词: ELECTROCHEMICAL ENERGY-STORAGE;    PERFORMANCE;    LITHIUM;    GRAPHENE;    ELECTRODES;    NANOTUBES;   

DOI  :  10.1016/j.gee.2022.02.013

来源: SCIE

【 摘 要 】

Potassium-ion hybrid capacitors (PIHCs) as a burgeoning research hotspot are an ideal replacement for lithium-ion hybrid capacitors (LIHCs). Here, we report nitrogen-doped porous carbon nanosheets (NPCNs) with enlarged interlayer spacing, abundant defects, and favorable mesoporous structures. The structural changes of NPCNs in potassiation and depotassiation processes are analyzed by using Raman spec-troscopy and transmission electron microscopy. Due to the unique structure of NPCNs, the PIHC device assembled using NPCNs as both the anode and cathode material (double-functional self-matching material) exhibits a superior energy density of 128 Wh kg -1 with a capacity retention of 90.8% after 9000 cycles. This research can promote the development of double-functional self-matching materials for hybrid energy storage devices with ultra-high performance.(c) 2022 Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communi-cations Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).