首页|Urea-treatment of CoOx carbon nanofibers to improve the electrochemical performance of supercapacitor using aqueous electrolytes

Urea-treatment of CoOx carbon nanofibers to improve the electrochemical performance of supercapacitor using aqueous electrolytes

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Supercapacitors(SCs)play a crucial role in flexible electronics,necessitating innovative approaches to enhance surface faradaic reactions and minimize faradaic diffusion while using aqueous electrolytes.Thus,the urea treatment of cobalt oxide(CoOx)-decorated carbon nanofibers(CNFs)is proposed in this study to decrease the contribution of faradaic diffusion-limited current.Flexible CoOx/CNF electrodes were obtained by annealing ZIF-67-grafted polyacrylonitrile(PAN)fibers via a wet chemical method.The urea treatment of CoOx/CNFs increased the content of sp2-hybridized carbon and pyridinic nitrogen,as confirmed by X-ray photoelectron spectroscopy,effectively enhancing conductivity and pseudocapacitive charge storage capability via nitrogen doping.Notably,urea-treated CoOx/CNF electrode samples exhibited a capacitance of 750 mF cm-2 at a scan rate of 10 mV s-1,while retaining more than 81％capacitance at a higher scan rate of 100 mV s-1.The cyclic voltammetry curves during variable bending angle testing(0°,45°,and 90°)exhibited negligible changes,indicating the excellent flexibility of the SCs.The CoOx/CNFs and urea-treated CoOx/CNFs exhibited 80％and 91％capacitance retentions,respectively,after 10,000 galvanostatic charge and discharge cycles.Furthermore,the attained energy densities of 76 and 61 pWh cm-2 at the respective power densities of 2 and 20 mW cm-2 indicated the excellent electrochemical performance of the optimal urea-treated CoOx/CNF electrode.

ElectrospinningZIF-67Carbon nanofiberFreestanding electrodeFlexible supercapacitorUrea

Bhavana Joshi、Seongdong Kim、Edmund Samuel、Jungwoo Huh、Mohammed S.Almoiqli、Khalid N.Alharbi、Sam S.Yoon

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School of Mechanical Engineering,Korea University,Seoul 02841,Republic of Korea

Energy Environment Policy and Technology,Graduate School of Energy and Environment(KU-KIST Green School),Korea University,Seoul 02841,Republic of Korea

Desalination Technologies Institute,King Abdulaziz City for Science and Technology(KACST),Riyadh 11442,Kingdom of Saudi Arabia

Nuclear Technologies Institute(NTI),King Abdulaziz City for Science and Technology(KACST),Riyadh 11442,Kingdom of Saudi Arabia

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2024

10.1016/j.jmst.2024.02.063

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.200(33)