Supersonically sprayed self-aligne d rGO nanosheets and ZnO/ZnMn_(2)O_(4)nanowires for high-energy and high-power-density supercapacitors  

作　　者：Chanwoo Park Edmund Samuel Byeong-Yeop Kim Seongpil An Hae-Seok Lee Sam S.Yoon 

机构地区：[1]School of Mechanical Engineering,Korea University,Seoul 02841,Republic of Korea [2]Energy Environment Policy and Technology,Graduate School of Energy and Environment(KU-KIST Green School),Korea University,Republic of Korea [3]SKKU Advanced Institute of Nanotechnology(SAINT)and Department of Nano Engineering,Sungkyunkwan University(SKKU),Suwon 16419,Republic of Korea

出　　处：《Journal of Materials Science & Technology》2023年第6期193-204,共12页材料科学技术（英文版）

基　　金：This work was financially supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(Nos.NRF-2020R1A5A1018153,NRF-2021R1A2C2010530,and 2020K1A3A1A74114847);This research was also supported by Technology R&D Project through the Korea Health Industry Development Institute(KHIDI),funded by the Ministry of Health&Wel-fare,Republic of Korea(No.HI21C0049010021).

摘　　要：Core-shell-type bimetallic oxide and carbon composites comprising zinc oxide(ZnO)nanospheres and zinc manganese oxide(ZnMn_(2)O_(4))nanowires were produced by a hydrothermal method,and supersoni-cally sprayed together with reduced graphene oxide(rGO)nanosheets onto Ni foil to fabricate flexible su-percapacitors.The supersonic impact facilitated the exfoliation of the rGO nanosheets,thereby increasing the surface area and adhesion of the composite particles to the substrate.The rGO nanosheets were vertically aligned during the supersonic impact and formed localized zones,enabling optimal accommodation of the ZnO/ZnMn_(2)O_(4)particles.This localization,with the addition of rGO,reduced the agglomeration of ZnO/ZnMn_(2)O_(4)particles.The molar concentration of MnSO_(4)used in the synthesis of ZnO/ZnMn_(2)O_(4)was varied from 0.05 to 0.15 mol/L to determine the optimal MnSO_(4)concentration that would result in the highest energy storage capacitance.The unique nanostructure of ZnO/ZnMn_(2)O_(4)and the self-alignment of rGO sheets facilitated a favorable environment for high energy storage capability with a specific capaci-tance of 276.3 mF·cm^(−2)at a current density of 0.5 mA·cm^(−2)and an energy density of 98.2μWh·cm^(−2)at a power density of 1600μW·cm^(−2).The width of the potential window was increased to 1.2 V,imply-ing a significant increase in the energy storage capability of the supercapacitor.Capacitance retention of 88%was achieved after 10,000 charge/discharge cycles for the supercapacitor fabricated using an optimal MnSO_(4)concentration(0.10 mol/L)during the composite synthesis.

关 键 词：ZnO/ZnMn_(2)O_(4)nanowires rGO nanosheets Hydrothermal method Supersonic spraying Supercapacitor 

分 类 号：TM53[电气工程—电器] TS106[轻工技术与工程—纺织工程]