Carbon nanofibers films are typical flexible electrode in the field of energy storage,but their application in Zinc-ion hybrid capacitors(ZIHCs)is limited by the low energy density due to the lack of active adsorption sites.In this work,an in-situ exfoliation strategy is reported to modulate the chemisorption sites of carbon nanofibers by high pyridine/pyrrole nitrogen doping and carbonyl functionalization.The experimental results and theoretical calculations indicate that the highly electronegative pyridine/pyrrole nitrogen dopants can not only greatly reduce the binding energy between carbonyl group and Zn2+by inducing charge delocalization of the carbonyl group,but also promote the adsorption of Zn2+by bonding with the carbonyl group to form N-Zn-O bond.Benefit from the multiple highly active chemisorption sites generated by the synergy between carbonyl groups and pyridine/pyrrole nitrogen atoms,the resulting carbon nanofibers film cathode displays a high energy density,an ultralong-term lifespan,and excellent capacity reservation under commercial mass loading(14.45 mg cm-2).Particularly,the cathodes can also operate stably in flexible or quasi-solid devices,indicating its application potential in flexible electronic products.This work established a universal method to solve the bottleneck problem of insufficient active adsorption sites of carbon-based ZIHCs.Imoproved should be changed into Improved.

Hongcheng He;Jichun Lian;Changmiao Chen;Qiaotian Xiong;Cheng Chao Li;Ming Zhang

Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education,Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices,Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy,School of Physics and Electronics,College of Semiconductors(College of Integrated Circuits),Hunan University,Changsha 410082,People's Republic of China;Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,People's Republic of China;School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,People's Republic of China

纳微快报（英文）

[1]Hongcheng He;Jichun Lian;Changmiao Chen;Qiaotian Xiong;Cheng Chao Li;Ming Zhang-.Enabling Multi-Chemisorption Sites on Carbon Nanofibers Cathodes by an In-situ Exfoliation Strategy for High-Performance Zn-Ion Hybrid Capacitors)[J].纳微快报（英文）,2022(07):1-15

Exfoliation,ZIHCs,Zn2+by,Imoproved

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