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Incorporating Interstitial Carbon Atoms and Graphene Quantum Dots in Crystalline Ni(OH)Cl for Ultrastable and Superior Rate Supercapacitors
Author(s) -
Wang Guanwen,
Zhou Wenbo,
Chi Chunlei,
Zhou Yufei,
Liu Zheng,
Qiu Zhipeng,
Yan Yingchun,
Huangfu Chao,
Qi Bin,
Li Zhiyuan,
Gao Pengfei,
Wang Chuanqing,
Gao Wenpei,
Wei Tong,
Fan Zhuangjun
Publication year - 2025
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202405378
Subject(s) - materials science , quantum dot , graphene , supercapacitor , nanotechnology , carbon fibers , chemical engineering , composite material , chemistry , composite number , electrode , electrochemistry , engineering
Abstract Despite their high theoretical capacity, Ni‐based materials are hindered by significant issues such as structural degradation, low intrinsic conductivity, and sluggish kinetics, resulting in poor stability and rate performance. Herein, the Ni(OH)Cl‐ICA‐GQDs incorporated with interstitial carbon atoms (ICAs) and graphene quantum dots (GQDs) are proposed to radically reverse its structural stability and electronic transport capability. ICAs can induce lattice micro‐strain that adjusts bond lengths and angles, leading to intrinsically ameliorated structural stability under alkaline and even acidic conditions. GQDs promote the formation of micro‐conductive circuits, optimizing the electronic configuration and redox kinetics. As a result, the Ni(OH)Cl‐ICA‐GQDs electrode achieves exceptional cyclic stability (91.5% retention after 20 000 cycles versus 70.3% retention after 2000 cycles for Ni(OH)Cl) and remarkable rate capability (312C g −1 at 100 A g −1 vs 109C g −1 at 50 A g −1 for Ni(OH)Cl). Furthermore, the Ni(OH)Cl‐ICA‐GQDs//AC hybrid supercapacitor achieves an ultrahigh power density of 41.5 kW kg −1 with an energy density of 28.8 Wh kg −1 , surpassing most Ni‐based supercapacitors. This approach offers a promising strategy for the precise modification of high‐performance electrodes for energy storage applications.