Hierarchical mesoporous Co_3O_4@ZnCo_2O_4 hybrid nanowire arrays supported on Ni foam for high-performance asymmetric supercapacitors

用于高性能非对称超级电容器电极的泡沫镍负载分层介孔Co_3O_4@ZnCo_2O_4混合纳米线阵列（英文）

In this paper, hierarchical mesoporous Co3O4@ZnCo2O4 hybrid nanowire arrays（NWAs） on Ni foam were prepared through a two-step hydrothermal process associated with successive annealing treatment. The Co3O4@ZnCo2O4 hybrid NWAs exhibited excellent electrochemical performances with a high specific capacity of 1,240.5 C g^-1 at a current density of 2 mA cm^-2, with rate capability of 59.0%shifting from 2 to 30 mA cm^-2, and only a 9.1% loss of its capacity even after 3,000 cycles at a consistent current density of 10 mA cm^-2. An asymmetric supercapacitor（Co3O4@ZnCo2O4 NWAs｜｜activated carbon） was fabricated and exhibited a high specific capacity of 168 C g^-1 at a current density of 1 A g^-1. And a preferable energy density of 37.3 W h kg^-1 at a power density of 800 W kg^-1 was obtained. The excellent electrochemical performances indicate the promising potential application of the hierarchical mesoporous Co3O4@ZnCo2O4 hybrid NWAs in energy storage field.

本文采用两步水热法和连续的退火处理过程,制备了分层介孔Co_3O_4@ZnCo_2O_4复合纳米线阵列.所制备的Co_3O_4@ZnCo_2O_4复合纳米线阵列具有优异的电化学性能,在2 mA cm^(-2)的电流密度下具有高达1240.5 C g^(-1)的比容量.当电流密度升高至30 mA cm^(-2)时,比容量保持率为59.0%,甚至在10 mA cm^(-2)的电流密度下循环3000圈,比容量仅下降9.1%.将其与活性炭组装成非对称超级电容器,可以在1 A g^(-1)的电流密度下表现出168 C g^(-1)的比容量.当功率密度为800 W kg^(-1)时,能量密度为37.3 W h kg^(-1).Co_3O_4@ZnCo_2O_4复合纳米阵列在储能领域具有广阔的应用前景.