Synthesis and Characterization of Electrodeposited Amorphous MnO2 Electrodes for High Performance Supercapacitor

• Main Authors: FANG, TZU-YA, 方姿雅
• Other Authors: YANG, WEIN-DUO
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/sp277y

碩士 === 國立高雄科技大學 === 化學工程與材料工程系 === 107 === A high performance supercapacitor based on an amorphous MnO2 electrode on Ni foam (NF) in a Na2SO4/KOH mixed electrolyte is fabricated and studied. The electrochemical behaviors of amorphous MnO2 are studied by using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) measurements, and the cycling performance. XRD, Raman, TEM, and SEM characterizations are highlighted on the nanostructure of these amorphous MnO2 materials. An asymmetric supercapacitor has been developed successfully with amorphous MnO2 and graphene nanosheets (GNS)/multiwalled carbon nanotubes (MWCNTs) as the positive and negative electrodes, respectively. The MnO2//GNS-MWCNT (GM) asymmetric supercapacitor exhibits a maximum energy density of 43.3 Wh/kg at a power density of 500 W/kg and a favorable cycling performance with 87 % capacitance retention after 1000 cycles. These results show manageable and high performance, which offers a promising future for practical applications.