Enhanced-Performance Asymmetric Supercapacitor Based on a Multidimensional Hierarchically Assembled NiMoO<sub>4</sub>/ZnMoO<sub>4</sub>/NF Electrode
Lele Zhang, Yuyu Zhang, Yu Cui, Chunli Guo, Yu-Lin Bai, Mengjie Zhang, Han Chen, Yue Tian
Abstract
The multidimensional microstructure of bimetallic oxides shows a synergistic effect and enhanced energy storage performance compared to their monometallic oxides with a single microstructure. One-dimensional (1D) NiMoO 4 /ZnMoO 4 nanorods self-assembled from two-dimensional (2D) ultrathin NiMoO 4 nanosheets loaded with zero-dimensional (0D) ZnMoO 4 nanoparticles were evenly grown on the surface of Ni foam (NZMO/NF) by combining hydrothermal method and heat treatment. The NZMO/NF electrode for supercapacitors shows a high specific capacity of 2064.07 F g –1 at 2 mA cm –2 and an excellent capacity maintenance of 99% after 10 000 cycles. Such exceptional performances can be boiled down to its distinctive structural design of multidimensional hierarchy. In addition, the asymmetric pseudocapacitor assembled with NZMO/NF and AC exhibits not only a maximum energy density of 47.4 Wh kg –1 but also a relatively good cyclability (91.74% capacitance retention after 12 000 cycles), demonstrating a promising application as supercapacitor electrode materials.