Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 47, Pages 24509-24522Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta08976k
Keywords
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Funding
- Nano-Material Technology Development Program through the National Research Foundation (NRF) - Ministry of Science and ICT of Republic of Korea [2016M3A7B4900117]
- Leading Human Resource Training Program of Regional Neo Industry through the National Research Foundation (NRF) - Ministry of Science and ICT of Republic of Korea [2016H1D5A1909049]
- DST, Govt of India [IFA13-MS-02]
- National Research Foundation of Korea [2016M3A7B4900117, 2016H1D5A1909049] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The design and development of innovative heterostructures with multifunctional properties are technically very important for efficient practical energy storage and conversion applications. Herein, we report the synthesis of a nitrogen-doped carbon (N-C) layer sandwiched between MnCo2O4 and MnO2 (MnCo2O4@N-C@MnO2) as a core@sandwich@shell type heterostructure on Ni foam. The thin layer of sandwiched N-C acts as a superhighway for good electron/ion transport and protects the MnCo2O4 and MnO2 from destructive morphological changes during repeated charge-discharge processes. The MnCo2O4@N-C@MnO2 material is well characterized by standard techniques, and its energy storage performance is studied in a three-electrode system and solid-state asymmetric capacitor device. The resultant electrochemical performance is compared with those of MnCo2O4 and MnCo2O4@N-C. The MnCo2O4@N-C@MnO2 electrode exhibits an excellent areal/gravimetric capacity of 0.75 mA h cm(-2)/312 mA h g(-1) at 3 mA cm(-2) with ca. 89.6% capacitance retention after 10000 cycles. A solid-state asymmetric supercapacitor device assembled with MnCo2O4@N-C@MnO2 as a cathode and nitrogen-doped graphene hydrogel as an anode exhibits a high energy density of 68.2 W h kg(-1) at 749.2 W kg(-1) power density without compromising long cycle life (ca. 91.1% retention after 10000 cycles). The highly efficient energy storage performance of this new class of heterostructures synthesized with earth-abundant materials enables commercial applications.
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