Co‐MnO2 Nanorods for High‐Performance Sodium/Potassium‐Ion Batteries and Highly Conductive Gel‐Type Supercapacitors
Abstract Manganese dioxide (MnO2) is considered as a strong candidate in the field of new‐generation electronic equipment. Herein, Co‐MnO2 has excellent electrochemical properties in tests as the cathode electrode of sodium‐ion batteries and potassium‐ion batteries. The rate performance remains at 5...
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| Format: | Article |
| Language: | English |
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Wiley
2022-03-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202105510 |
| _version_ | 1811273471205834752 |
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| author | Jun Han Dian‐sen Li Lei Jiang Dai‐ning Fang |
| author_facet | Jun Han Dian‐sen Li Lei Jiang Dai‐ning Fang |
| author_sort | Jun Han |
| collection | DOAJ |
| description | Abstract Manganese dioxide (MnO2) is considered as a strong candidate in the field of new‐generation electronic equipment. Herein, Co‐MnO2 has excellent electrochemical properties in tests as the cathode electrode of sodium‐ion batteries and potassium‐ion batteries. The rate performance remains at 50.2 mAh g−1 at 200 mA g−1 for sodium‐ion batteries. X‐ray diffraction (XRD) is utilized to evaluate the crystal structure transition from Co0.2‐MnO2 to NaMnO2 with discharge to 1 V, proving that Co‐doping does indeed facilitate the acceleration of ion transport and support layer spacing to stabilize the structure of MnO2. Subsequently, highly conductive (0.0848 S cm−1) gel‐type supercapacitors are prepared by combining Co0.2‐MnO2, potassium hydroxide (KOH), and poly(vinyl alcohol) (PVA) together. Co0.2‐MnO2 provides capacitive behavior and strengthens the hydrogen bonds between molecules. KOH acts as an ion crosslinker to enhance hydrogen bond and as electrolyte to transport ions. 5 wt% Co0.2‐MnO2@KOH/PVA has superb mechanical endurance, appreciable electrical conductivity, and ideal capacitive behavior. The quasi‐solid‐state supercapacitor demonstrates stabilized longevity (86.5% at 0.2 mA cm−3 after 500 cycles), which can greatly promote the integration of flexible energy storage fabric devices. |
| first_indexed | 2024-04-12T22:59:42Z |
| format | Article |
| id | doaj.art-178674f013104d428653d7fd7f974a78 |
| institution | Directory Open Access Journal |
| issn | 2198-3844 |
| language | English |
| last_indexed | 2024-04-12T22:59:42Z |
| publishDate | 2022-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advanced Science |
| spelling | doaj.art-178674f013104d428653d7fd7f974a782022-12-22T03:13:05ZengWileyAdvanced Science2198-38442022-03-0199n/an/a10.1002/advs.202105510Co‐MnO2 Nanorods for High‐Performance Sodium/Potassium‐Ion Batteries and Highly Conductive Gel‐Type SupercapacitorsJun Han0Dian‐sen Li1Lei Jiang2Dai‐ning Fang3Key Laboratory of Bio‐Inspired Smppart Interfacial Science and Technology Ministry of Education School of Chemistry Beihang University Beijing 100191 ChinaKey Laboratory of Bio‐Inspired Smppart Interfacial Science and Technology Ministry of Education School of Chemistry Beihang University Beijing 100191 ChinaKey Laboratory of Bio‐Inspired Smppart Interfacial Science and Technology Ministry of Education School of Chemistry Beihang University Beijing 100191 ChinaState Key Laboratory for Turbulence & Complex Systems College of Engineering Peking University Beijing 100871 ChinaAbstract Manganese dioxide (MnO2) is considered as a strong candidate in the field of new‐generation electronic equipment. Herein, Co‐MnO2 has excellent electrochemical properties in tests as the cathode electrode of sodium‐ion batteries and potassium‐ion batteries. The rate performance remains at 50.2 mAh g−1 at 200 mA g−1 for sodium‐ion batteries. X‐ray diffraction (XRD) is utilized to evaluate the crystal structure transition from Co0.2‐MnO2 to NaMnO2 with discharge to 1 V, proving that Co‐doping does indeed facilitate the acceleration of ion transport and support layer spacing to stabilize the structure of MnO2. Subsequently, highly conductive (0.0848 S cm−1) gel‐type supercapacitors are prepared by combining Co0.2‐MnO2, potassium hydroxide (KOH), and poly(vinyl alcohol) (PVA) together. Co0.2‐MnO2 provides capacitive behavior and strengthens the hydrogen bonds between molecules. KOH acts as an ion crosslinker to enhance hydrogen bond and as electrolyte to transport ions. 5 wt% Co0.2‐MnO2@KOH/PVA has superb mechanical endurance, appreciable electrical conductivity, and ideal capacitive behavior. The quasi‐solid‐state supercapacitor demonstrates stabilized longevity (86.5% at 0.2 mA cm−3 after 500 cycles), which can greatly promote the integration of flexible energy storage fabric devices.https://doi.org/10.1002/advs.202105510Co dopingflexible quasi‐solid‐state supercapacitorpotassium‐ion batteriessodium‐ion batteries |
| spellingShingle | Jun Han Dian‐sen Li Lei Jiang Dai‐ning Fang Co‐MnO2 Nanorods for High‐Performance Sodium/Potassium‐Ion Batteries and Highly Conductive Gel‐Type Supercapacitors Advanced Science Co doping flexible quasi‐solid‐state supercapacitor potassium‐ion batteries sodium‐ion batteries |
| title | Co‐MnO2 Nanorods for High‐Performance Sodium/Potassium‐Ion Batteries and Highly Conductive Gel‐Type Supercapacitors |
| title_full | Co‐MnO2 Nanorods for High‐Performance Sodium/Potassium‐Ion Batteries and Highly Conductive Gel‐Type Supercapacitors |
| title_fullStr | Co‐MnO2 Nanorods for High‐Performance Sodium/Potassium‐Ion Batteries and Highly Conductive Gel‐Type Supercapacitors |
| title_full_unstemmed | Co‐MnO2 Nanorods for High‐Performance Sodium/Potassium‐Ion Batteries and Highly Conductive Gel‐Type Supercapacitors |
| title_short | Co‐MnO2 Nanorods for High‐Performance Sodium/Potassium‐Ion Batteries and Highly Conductive Gel‐Type Supercapacitors |
| title_sort | co mno2 nanorods for high performance sodium potassium ion batteries and highly conductive gel type supercapacitors |
| topic | Co doping flexible quasi‐solid‐state supercapacitor potassium‐ion batteries sodium‐ion batteries |
| url | https://doi.org/10.1002/advs.202105510 |
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