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Hierarchical mesoporous Co3O4@ZnCo2O4 hybrid nanowire arrays supported on Ni foam for high-performance asymmetric supercapacitors

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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… Click to show full abstract

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 1240.5 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 37.3Wh 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.摘要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Co3O4@ZnCo2O4复合纳米线阵列. 所制备的Co3O4@ZnCo2O4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. Co3O4@ZnCo2O4复合纳米阵列在储能领域具有广阔的应用前景.

Keywords: co3o4 znco2o4; hierarchical mesoporous; znco2o4 hybrid; mesoporous co3o4; co3o4

Journal Title: Science China Materials
Year Published: 2018

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