Electroactive Ultra-Thin rGO-Enriched FeMoO<sub>4</sub> Nanotubes and MnO<sub>2</sub> Nanorods as Electrodes for High-Performance All-Solid-State Asymmetric Supercapacitors
A flexible asymmetric supercapacitor (ASC) with high electrochemical performance was constructed using reduced graphene oxide (rGO)-wrapped redox-active metal oxide-based negative and positive electrodes. Thin layered rGO functionality on the positive and the negative electrode surfaces has promoted...
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MDPI AG
2020-02-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/2/289 |
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| author | Kugalur Shanmugam Ranjith Ganji Seeta Rama Raju Nilesh R. Chodankar Seyed Majid Ghoreishian Cheol Hwan Kwak Yun Suk Huh Young-Kyu Han |
| author_facet | Kugalur Shanmugam Ranjith Ganji Seeta Rama Raju Nilesh R. Chodankar Seyed Majid Ghoreishian Cheol Hwan Kwak Yun Suk Huh Young-Kyu Han |
| author_sort | Kugalur Shanmugam Ranjith |
| collection | DOAJ |
| description | A flexible asymmetric supercapacitor (ASC) with high electrochemical performance was constructed using reduced graphene oxide (rGO)-wrapped redox-active metal oxide-based negative and positive electrodes. Thin layered rGO functionality on the positive and the negative electrode surfaces has promoted the feasible surface-active sites and enhances the electrochemical response with a wide operating voltage window. Herein we report the controlled growth of rGO-wrapped tubular FeMoO<sub>4</sub> nanofibers (NFs) via electrospinning followed by surface functionalization as a negative electrode. The tubular structure offers the ultrathin-layer decoration of rGO inside and outside of the tubular walls with uniform wrapping. The rGO-wrapped tubular FeMoO<sub>4</sub> NF electrode exhibited a high specific capacitance of 135.2 F g<sup>−1</sup> in Na<sub>2</sub>SO<sub>4</sub> neutral electrolyte with an excellent rate capability and cycling stability (96.45% in 5000 cycles) at high current density. Meanwhile, the hydrothermally synthesized binder-free rGO/MnO<sub>2</sub> nanorods on carbon cloth (rGO-MnO<sub>2</sub>@CC) were selected as cathode materials due to their high capacitance and high conductivity. Moreover, the ASC device was fabricated using rGO-wrapped FeMoO<sub>4</sub> on carbon cloth (rGO-FeMoO<sub>4</sub>@CC) as the negative electrode and rGO-MnO<sub>2</sub>@CC as the positive electrode (rGO-FeMoO<sub>4</sub>@CC/rGO-MnO<sub>2</sub>@CC). The rationally designed ASC device delivered an excellent energy density of 38.8 W h kg<sup>−1</sup> with a wide operating voltage window of 0.0−1.8 V. The hybrid ASC showed excellent cycling stability of 93.37% capacitance retention for 5000 cycles. Thus, the developed rGO-wrapped FeMoO<sub>4</sub> nanotubes and MnO<sub>2</sub> nanorods are promising hybrid electrode materials for the development of wide-potential ASCs with high energy and power density. |
| first_indexed | 2024-04-13T05:51:55Z |
| format | Article |
| id | doaj.art-1a68060952fb45f681f72342d627b2ed |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-04-13T05:51:55Z |
| publishDate | 2020-02-01 |
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| series | Nanomaterials |
| spelling | doaj.art-1a68060952fb45f681f72342d627b2ed2022-12-22T02:59:45ZengMDPI AGNanomaterials2079-49912020-02-0110228910.3390/nano10020289nano10020289Electroactive Ultra-Thin rGO-Enriched FeMoO<sub>4</sub> Nanotubes and MnO<sub>2</sub> Nanorods as Electrodes for High-Performance All-Solid-State Asymmetric SupercapacitorsKugalur Shanmugam Ranjith0Ganji Seeta Rama Raju1Nilesh R. Chodankar2Seyed Majid Ghoreishian3Cheol Hwan Kwak4Yun Suk Huh5Young-Kyu Han6Department of Energy and Material Engineering, Dongguk University-Seoul, Seoul 04620, KoreaDepartment of Energy and Material Engineering, Dongguk University-Seoul, Seoul 04620, KoreaDepartment of Energy and Material Engineering, Dongguk University-Seoul, Seoul 04620, KoreaDepartment of Biological Engineering, Inha University, Incheon 22212, KoreaDepartment of Biological Engineering, Inha University, Incheon 22212, KoreaDepartment of Biological Engineering, Inha University, Incheon 22212, KoreaDepartment of Energy and Material Engineering, Dongguk University-Seoul, Seoul 04620, KoreaA flexible asymmetric supercapacitor (ASC) with high electrochemical performance was constructed using reduced graphene oxide (rGO)-wrapped redox-active metal oxide-based negative and positive electrodes. Thin layered rGO functionality on the positive and the negative electrode surfaces has promoted the feasible surface-active sites and enhances the electrochemical response with a wide operating voltage window. Herein we report the controlled growth of rGO-wrapped tubular FeMoO<sub>4</sub> nanofibers (NFs) via electrospinning followed by surface functionalization as a negative electrode. The tubular structure offers the ultrathin-layer decoration of rGO inside and outside of the tubular walls with uniform wrapping. The rGO-wrapped tubular FeMoO<sub>4</sub> NF electrode exhibited a high specific capacitance of 135.2 F g<sup>−1</sup> in Na<sub>2</sub>SO<sub>4</sub> neutral electrolyte with an excellent rate capability and cycling stability (96.45% in 5000 cycles) at high current density. Meanwhile, the hydrothermally synthesized binder-free rGO/MnO<sub>2</sub> nanorods on carbon cloth (rGO-MnO<sub>2</sub>@CC) were selected as cathode materials due to their high capacitance and high conductivity. Moreover, the ASC device was fabricated using rGO-wrapped FeMoO<sub>4</sub> on carbon cloth (rGO-FeMoO<sub>4</sub>@CC) as the negative electrode and rGO-MnO<sub>2</sub>@CC as the positive electrode (rGO-FeMoO<sub>4</sub>@CC/rGO-MnO<sub>2</sub>@CC). The rationally designed ASC device delivered an excellent energy density of 38.8 W h kg<sup>−1</sup> with a wide operating voltage window of 0.0−1.8 V. The hybrid ASC showed excellent cycling stability of 93.37% capacitance retention for 5000 cycles. Thus, the developed rGO-wrapped FeMoO<sub>4</sub> nanotubes and MnO<sub>2</sub> nanorods are promising hybrid electrode materials for the development of wide-potential ASCs with high energy and power density.https://www.mdpi.com/2079-4991/10/2/289electrospinningfemoo<sub>4</sub> nanotubesrgo wrappingmno<sub>2</sub>-rgoasymmetric supercapacitors |
| spellingShingle | Kugalur Shanmugam Ranjith Ganji Seeta Rama Raju Nilesh R. Chodankar Seyed Majid Ghoreishian Cheol Hwan Kwak Yun Suk Huh Young-Kyu Han Electroactive Ultra-Thin rGO-Enriched FeMoO<sub>4</sub> Nanotubes and MnO<sub>2</sub> Nanorods as Electrodes for High-Performance All-Solid-State Asymmetric Supercapacitors Nanomaterials electrospinning femoo<sub>4</sub> nanotubes rgo wrapping mno<sub>2</sub>-rgo asymmetric supercapacitors |
| title | Electroactive Ultra-Thin rGO-Enriched FeMoO<sub>4</sub> Nanotubes and MnO<sub>2</sub> Nanorods as Electrodes for High-Performance All-Solid-State Asymmetric Supercapacitors |
| title_full | Electroactive Ultra-Thin rGO-Enriched FeMoO<sub>4</sub> Nanotubes and MnO<sub>2</sub> Nanorods as Electrodes for High-Performance All-Solid-State Asymmetric Supercapacitors |
| title_fullStr | Electroactive Ultra-Thin rGO-Enriched FeMoO<sub>4</sub> Nanotubes and MnO<sub>2</sub> Nanorods as Electrodes for High-Performance All-Solid-State Asymmetric Supercapacitors |
| title_full_unstemmed | Electroactive Ultra-Thin rGO-Enriched FeMoO<sub>4</sub> Nanotubes and MnO<sub>2</sub> Nanorods as Electrodes for High-Performance All-Solid-State Asymmetric Supercapacitors |
| title_short | Electroactive Ultra-Thin rGO-Enriched FeMoO<sub>4</sub> Nanotubes and MnO<sub>2</sub> Nanorods as Electrodes for High-Performance All-Solid-State Asymmetric Supercapacitors |
| title_sort | electroactive ultra thin rgo enriched femoo sub 4 sub nanotubes and mno sub 2 sub nanorods as electrodes for high performance all solid state asymmetric supercapacitors |
| topic | electrospinning femoo<sub>4</sub> nanotubes rgo wrapping mno<sub>2</sub>-rgo asymmetric supercapacitors |
| url | https://www.mdpi.com/2079-4991/10/2/289 |
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