The high performance of an electrode relies largely on a scrupulous design of nanoarchitectures and smart hybridization of electroactive materials.A porous core-shell architecture in which one-dimensional cobalt oxide(Co3O4) nanowire cores are grown on nickel foam prior to the growth of layered double hydroxide (LDH) shells is fabricated.Hydrothermal precipitation and thermal treatment result in homogeneous forests of 70-nm diameter Co3O4 nanowire,which are wrapped in LDH-nanosheet-built porous covers through a liquid phase deposition method.Due to the unique core-shell architecture and the synergetic effects of Co3O4 and NiAl-LDH,the obtained Co3O4@LDH electrode exhibits a capacitance of 1 133.3 F/g at a current density of 2 A/g and 688.8 F/g at 20 A/g (5.3 F/cm2 at 9.4 mA/cm2 and 3.2 F/cm2 at 94 mA/cm2),which are better than those of the individual Co3O4 nanowire.Moreover,the electrode shows excellent cycling performance with a retention rate of 90.4％ after 3 000 cycles at a current density of 20 A/g.
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机译：电极的高性能在很大程度上取决于纳米结构的精心设计和电活性材料的智能杂交。多孔核-壳结构，其中一维氧化钴（Co3O4）纳米线核先在泡沫镍上生长，然后再分层生长制备了双氢氧化物（LDH）壳。水热沉淀和热处理导致直径70 nm的Co3O4纳米线的均匀森林通过液相沉积方法包裹在LDH-纳米片建造的多孔盖中。壳结构以及Co3O4和NiAl-LDH的协同作用，所得Co3O4 @ LDH电极在2 A / g的电流密度下显示的电容为1 133.3 F / g，在20 A / g（5.3 F在9.4 mA / cm2时为/ cm2，在94 mA / cm2时为3.2 F / cm2），优于单独的Co3O4纳米线。此外，该电极表现出出色的循环性能，在3 000次循环下于90.4％的保持率一种趋势 密度为20 A / g。
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