Hu Zeyuan, Miao Yidong, Xue Xiaolan, Xiao Bin, Qi Jiqiu, Wei Fuxiang, Meng Qinkun, Sui Yanwei, Sun Zhi, Liu Jinlong
Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, People's Republic of China.
Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, People's Republic of China.
J Colloid Interface Sci. 2021 Oct;599:34-45. doi: 10.1016/j.jcis.2021.04.085. Epub 2021 Apr 20.
Growing electroactive materials directly on a three-dimensional conductive substrate can effectively reduce the "ineffective area" of the electrode during the electrochemical reaction, increase the utilization rate of the material, and thus increase the energy density of the device. Using the network structure of the three-dimensional conductive substrate to design electrode materials with unique microstructures can also improve the stability of the materials. In this work, we obtained different copper-based materials on the copper foam (CF) by in-situ growth method, and designed an independent three-dimensional layered CuO@NiCoFe-S (CuO@NCFS) core-shell nanostructure composite material. CuO@NCFS exhibits excellent electrochemical performance, reaching a specific capacitance of 4551 mF cm at a current density of 1 mA cm with good cycle stability (94.2% after 5000 cycles). In addition, the asymmetric supercapacitor (ASC) uses CuO@NCFS as the positive electrode and rGO as the negative electrode, which can provide an energy rate density of 4.5 mW cm at a high energy density of 99.9 μWh cm. The findings provide some insight into rational design of electrode materials for high performance energy storage.
在三维导电基底上直接生长电活性材料能够在电化学反应过程中有效减小电极的“无效面积”，提高材料的利用率，进而提升器件的能量密度。利用三维导电基底的网络结构来设计具有独特微观结构的电极材料，还能够提高材料的稳定性。在这项工作中，我们通过原位生长法在泡沫铜（CF）上获得了不同的铜基材料，并设计了一种独立的三维层状CuO@NiCoFe-S（CuO@NCFS）核壳纳米结构复合材料。CuO@NCFS表现出优异的电化学性能，在电流密度为1 mA cm时比电容达到4551 mF cm，且具有良好的循环稳定性（5000次循环后为94.2%）。此外，以CuO@NCFS作为正极、rGO作为负极的不对称超级电容器（ASC），在能量密度为99.9 μWh cm的情况下能够提供4.5 mW cm的功率密度。这些发现为高性能储能电极材料的合理设计提供了一些见解。
