Journal
FLATCHEM
Volume 29, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.flatc.2021.100268
Keywords
Manganese dioxide; Holey reduced graphene oxide; Composite film; Supercapacitor; Thick electrode
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2021R1A2C1009926]
- Ministry of Trade, Industry & Energy (MOTIE, Korea) [20010193]
- Korea Research Institute of Chemical Technology (KRICT) [SS2142-10]
- Central Laboratory of Kangwon National University at Samcheok
- Korea Evaluation Institute of Industrial Technology (KEIT) [20010193] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2021R1A2C1009926] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study developed high-performance 3D MnO2/HRGO electrodes with outstanding specific areal and volumetric capacitances, impressive rate capability, and energy densities, showcasing excellent performance in supercapacitors with electrode thicknesses greater than 100 pm.
Most manganese oxide-based electrodes used for energy-storage applications suffer from poor ion and electron transport, particularly at high mass loadings and with thick electrodes. To counter this issue, 3D electrodes were developed; however, enhancing their areal and volumetric performance at high mass loadings is still a challenge. In this study, highly compact and 3D porous manganese dioxide and holey reduced graphene oxide (3D MnO2/ HRGO) composite films were developed to ensure a high performance in supercapacitors at electrode thicknesses greater than 100 pm. The thick composite films were fabricated by the self-limiting deposition of MnO2 on 3D HRGO hydrogel scaffolds followed by capillary evaporation-induced drying. The 3D MnO2/HRGO electrodes optimized at a thickness of 216 mu m showed outstanding specific areal and volumetric capacitances of 2.3 F cm-2 and 108.0 F cm-3 at 1 mA cm-2 and an impressive rate capability with a capacitance retention of 72.2% in the range of 1-40 mA cm-2. Furthermore, supercapacitors assembled with the 3D MnO2/HRGO electrodes with high mass loadings exhibited impressively high areal and volumetric energy densities of 149.7 mu Wh cm-2 and 2.8 mWh cm-3, respectively.
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