One-pot synthesis of heterogeneous Co₃O₄-nanocube/Co(OH)₂-nanosheet hybrids for high-performance flexible asymmetric all-solid-state supercapacitors

Huan Pang, Xinran Li, Qunxing Zhao, Huaiguo Xue, Wen-Yong Lai, Zheng Hu, Wei Huang

School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002 China

Abstract:A novel heterogenous Co₃O₄-nanocube/Co(OH)₂-nanosheet hybrid is prepared by a controllable facile one-pot hydrothermal reaction. The resulting Co₃O₄nanocubes are highly uniform in morphology, and are distributed uniformly on the individual Co(OH)₂nanosheets. Such unique nanostructural features show significant advantages for applications as flexible supercapacitor electrodes in terms of enhanced durability and capacitance. The as-prepared electrode has offered a large capacitance of 1164 F g^-1at 1.2 A g^-1. When being paired with activated carbon, the resulting flexible all-solid-state device exhibited a maximum energy density of 9.4 mWh cm^-3. It is worthwhile noting that this as-assembled device showed little capacitance decay after over 5000 cycles with 97.4% retention of its original specific capacitance. Such a high performance outperforms most metal oxides-based electrodes and shows the advantages of the hybrid strategy, which shed light on exploring robust and cheap electrode materials for high-performance flexible supercapacitors.

Nano Energy,2017, 35, 138-145. IF = 11.553

文章链接:http://www.sciencedirect.com/science/article/pii/S2211285517301246