A homologous strategy to parallelly construct doped MOFs-derived electrodes for flexible solid-state hybrid supercapacitors  

作　　者：Yi-Lin Liu Ling Wang Qingyi Zeng Qi Kang Cheng Yan 

机构地区：[1]College of Mechanical Engineering,University of South China,Hengyang 421001,China [2]School of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China [3]Department of Polymer Science and Engineering,Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing,School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [4]School of Chemistry,Faculty of Science,The University of Sydney,Sydney 2006,Australia

出　　处：《Nano Research》2023年第8期10890-10898,共9页纳米研究（英文版）

基　　金：This work was financially supported by the start-up funding from University of South China(No.220XQD016);the National Natural Science Foundation of China(No.52170164);C.Y.thanks the Australian Research Council(ARC)for financial support through Discovery Project scheme(No.DP19010186).

摘　　要：Developing efficient and cost-effective electrode materials is of essential significance to advance various energy storage technologies,among which flexible supercapacitors hold great promise to meet the growing popularity of wearable electronics.Herein,we report a homologous strategy to parallelly synthesize phosphorus-doped ZnCo_(2)O_(4)(P-ZnCo_(2)O_(4)@NCC)and nitrogen-doped carbon(NC@NCC)both derived from ZnCo-metal-organic frameworks(MOFs)precursors in-situ grown on dopamine-modified carbon cloth(NCC)as conductive substrates.Impressively,the as-obtained P-ZnCo_(2)O_(4)@NCC can achieve a high specific capacitance of 2702.2 mF∙cm^(−2)at 1 mA∙cm^(−2)with the capacitance retention rate exceeding 70.6%at 10 mA∙cm^(−2),demonstrating the outstanding rate capability.Moreover,flexible solid-state hybrid supercapacitors,using P-ZnCo_(2)O_(4)@NCC as positive electrode and NC@NCC as negative electrode,are assembled with poly(vinyl alcohol)(PVA)/KOH as the gel electrolyte,which deliver the energy density of 11.9 mWh∙cm^(−3)when the power density reaches up to 47.3 mW∙cm^(−3).In addition,85.15%of the initial specific capacitance is maintained after 5000 continuous cycles and no obvious capacitance decay is observed under different bending conditions,revealing the excellent cycling stability and flexibility.As a proof-of-concept demonstration,two as-assembled hybrid supercapacitors connected in series can light up a red light-emitting diode(LED)under the bending angle of 180°,heralding the feasibility for broad practical applications.

关 键 词：homologous synthesis heteroatom-doping metal-organic frameworks energy storage flexible solid-state devices 

分 类 号：O64[理学—物理化学]