Ultrathin Metal–Organic Framework Nanosheet-Derived Ultrathin Co3O4 Nanomeshes with Robust Oxygen-Evolving Performance and Asymmetric Supercapacitors

• DOI: 10.1021/acsami.8b04026
• Publication Date: 2018-06-27T10:06:23Z
• Authors: Guijuan Wei; Zhen Zhou; Xixia Zhao; Weiqing Zhang; Changhua An
• Keywords: Nanosheet; Overpotential; Oxygen evolution; Imidazolate

Ultrathin metal-organic framework (MOF) nanosheets possessing inherent advantages of both two-dimensional (2D) features and MOFs are attracting intensive research interest. The direct manufacture MOF is still a challenge up to now. Here, we have developed novel bottom-up approach synthesize zeolitic imidazolate framework-67 (ZIF-67) nanosheets, which can be in situ converted into Co3O4 ultrathin nanomeshes after thermal treatment. Interestingly, the obtained rich oxygen defects, providing fruitful active sites for faradaic reaction. modified electrode exhibits large specific capacitance (1216.4 F g-1 at 1 A g-1), as well high rate capability (925.5 20 g-1). Moreover, an asymmetric supercapacitor made Co3O4//activated carbon shows energy density 46.5 Wh kg-1 790.7 W kg-1. Furthermore, 2D show outstanding performance evolution reaction with overpotential 230 mV onset potential small Tafel slope 74.0 dec-1. present method presents facile avenue preparation other metal oxide nanostructures various applications catalysis conversion.