Shish-kebab type MnCo2O4@Co3O4 nanoneedle arrays derived from MnCo-LDH@ZIF-67 for high-performance supercapacitors and efficient oxygen evolution reaction

By Jiaojiao Zhou, Xue Han, K. Tao, Qin Li, Yanli Li, L. Han. Chemical Engineering Journal, 2018

214 citations recorded by the source corpus.

Abstract One-dimensional micro-/nanostructure arrays with excellent synergistic effect have attracted considerable interest for their potential applications in energy storge and conversion devices. In this work, the uniform ZIF-67 rhombic dodecahedron penetrated CoMn-LDH nanoneedle arrays were firstly synthesized and then transformed into shish-kebab type MnCo2O4@Co3O4 nanoneedle arrays by thermal annealing in air. The resulting nanoneedle arrays exhibit high specific capacitance (1440C cm−2 at 1.0 mA cm−2) and excellent cycling stability while evaluated as promising electrodes for battery-type supercapacitor. An assembled asymmetric supercapacitor (ASC) device using MnCo2O4@Co3O4 as positive electrode and activated carbon (AC) as negative electrode also exhibits a high energy density of 31 Wh kg−1 at a power density of 208.5 W kg−1, furthermore, still remains 14.6 Wh kg−1 even at a higher power density of 3326.6 W kg−1. Importantly, a red light-emitting diode (LED) can be illuminated about 6 min, indicating a great potential for practical applications of the ASC. Besides, the MnCo2O4@Co3O4 exhibits much better electrocatalytic activity for the oxygen evolution reaction (OER). As a result, this work demonstrates a feasible strategy for the design and fabrication of 1D shish-kebab type nanoneedle arrays with multiple functions.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/3d8160fb505ce100b9e0ff661251d2fa7a0ca745