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https://doi.org/10.1039/d0ra05494a
Title: | MOF-derived manganese oxide/carbon nanocomposites with raised capacitance for stable asymmetric supercapacitor | Authors: | Wang, B.R. Hu, Y. Pan, Z. Wang, J. |
Issue Date: | 2020 | Publisher: | Royal Society of Chemistry | Citation: | Wang, B.R., Hu, Y., Pan, Z., Wang, J. (2020). MOF-derived manganese oxide/carbon nanocomposites with raised capacitance for stable asymmetric supercapacitor. RSC Advances 10 (57) : 34403-34412. ScholarBank@NUS Repository. https://doi.org/10.1039/d0ra05494a | Rights: | Attribution-NonCommercial 4.0 International | Abstract: | Owing to immense application potentials in electrochemical energy storages, metal organic framework (MOF)-derived metal oxide/carbon nanocomposites have attracted extensive interest of research. Although thermolysis has been widely employed to convert MOFs into various active materials, a large set ofin situchanges in chemical composition, phase(s) and morphology requires delicate control over heating parameters. Through an innovative two-stage process, Mn-MIL-100 is first transformed into MnO@C by annealing at 700 °C under N2flow, which is then transformed into Mn3O4@C at 200 °C in air, while retaining a high surface area. The appropriate retention of carbon content for Mn3O4@C can also be easily obtained with the control of heating time. In contrast, thermolysis of MnO@C at higher temperatures gives rise to manganese oxides with negligible carbon content and a greatly reduced surface area. The optimized Mn3O4@C-2 h, derived from MnO@C at 200 °C for 2 hours, showed the highest capacitance, far exceeding that of MnO@C and other derivatives. When combined with graphene oxide (GO) nanosheets to form a flexible Mn3O4@C/rGO paper electrode, it demonstrated a capacitance of 328.4 F cm?3. The Mn3O4@C/rGO-based asymmetric supercapacitor thus assembled also shows favorable performance. The present work demonstrates the excellent controllability afforded by the innovative two-stage thermolysis in optimizing the electrochemical performance of MOF-derived active materials as electrode materials in supercapacitors. © The Royal Society of Chemistry 2020. | Source Title: | RSC Advances | URI: | https://scholarbank.nus.edu.sg/handle/10635/197477 | ISSN: | 20462069 | DOI: | 10.1039/d0ra05494a | Rights: | Attribution-NonCommercial 4.0 International |
Appears in Collections: | Staff Publications Elements |
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