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Elastic sandwich-type GaN/MnO2/MnON composites for flexible supercapacitors with high energy density

Abstract

Metal oxides as supercapacitor (SC) electrode material possess high capacitance and energy density, however, the low electrical conductivity and the structure weakness resulted from volume shrinkage and expansion during energy storage process seriously hinder their rate capabilities and cycling performances. Herein, we design and fabricate a metal nitride/metal oxide/metal oxynitride elastic sandwich structure nanohybrid with double stabilized buffer layers for the first time. This unique hierarchical structure not only provides a highly conductive network and intimate contacts between carbon fiber (CF)/GaN and MnO2/Mn oxynitride (MnON) for effective charge transportation, but also offers synergistic physical restriction and chemical confinement of volume change during charge/discharge processes. Therefore, these conductive GaN/MnO2/MnON compact films used directly as electrode, display a high areal capacitance with 1915.5 mF cm‒2 (532.1 mAh cm‒2) at 0.1 mA cm‒2. A flexible symmetric supercapacitor device based on the GaN/MnO2/MnON hybrid electrode exhibit outstanding energy output efficiency (achieved an energy density of 0.76 mW h cm‒3), high capacity retention rate (the capacity still retained 95.5% after 10 000 cycles) and remarkable flexibility, showing its attractive prospect in wearable electronics and sustainable energy application. This design strategy provides an efficient way in applying the large volume change rate metal oxide materials to energy storage and conversion devices.

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Publication details

The article was received on 05 May 2018, accepted on 05 Jun 2018 and first published on 07 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA04182B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Elastic sandwich-type GaN/MnO2/MnON composites for flexible supercapacitors with high energy density

    S. Wang, Y. Shao, W. Liu, Y. Z. Wu and X. Hao, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA04182B

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