Homologous Nitrogen‐Doped Hierarchical Carbon Architectures Enabling Compatible Anode and Cathode for Potassium‐Ion Hybrid Capacitors

Potassium‐ion hybrid capacitors (PIHCs) have been considered as an emerging device to render grid‐scale energy storage. Nevertheless, the sluggish kinetics at the anode side and limited capacity output at the cathode side remain daunting challenges for the overall performances of PIHCs. Herein, an e...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2022-04, Vol.18 (13), p.e2107139-n/a
Main Authors: Yi, Yuyang, Zeng, Zhihan, Lian, Xueyu, Dou, Shixue, Sun, Jingyu
Format: Article
Language:English
Subjects:
Activated carbon
anode and cathode compatibility
Anodes
Capacitors
Carbon
Cathodes
Electrode materials
Electrokinetics
electrolytes
Energy storage
homologous strategy
Homology
Nanotechnology
Nitrogen
nitrogen‐doped hierarchical carbon architecture
Potassium
potassium‐ion hybrid capacitors
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Summary:Potassium‐ion hybrid capacitors (PIHCs) have been considered as an emerging device to render grid‐scale energy storage. Nevertheless, the sluggish kinetics at the anode side and limited capacity output at the cathode side remain daunting challenges for the overall performances of PIHCs. Herein, an exquisite “homologous strategy” to devise multi‐dimensional N‐doped carbon nanopolyhedron@nanosheet anode and activated N‐doped hierarchical carbon cathode targeting high‐performance PIHCs is reported. The anode material harnessing a dual‐carbon structure and the cathode candidate affording a high specific surface area (2651 m2 g−1) act in concert with a concentrated ether‐based electrolyte, resulting in an excellent half cell performance. The related storage mechanism is systematically revealed by in situ electrokinetic characterizations. More encouragingly, the thus‐derived PIHC full cell demonstrates a favorable energy output (157 Wh kg−1), showing distinct advantages over the state‐of‐the‐art PIHC counterparts. A potassium‐ion hybrid capacitor affording a homologous‐precursor‐derived, N‐doped carbon‐based anode and cathode manifests a favorable energy output (157 Wh kg−1). With the aid of a concentrated ether‐based electrolyte, its anode exhibits an outstanding cycling stability (almost 100% capacity retention after 1600 cycles), where the potassium storage feature is evaluated by exhaustive electroanalytic measurements.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202107139