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Controllable Synthesis of Copper Oxide/Carbon Core/Shell Nanowire Arrays and Their Application for Electrochemical Energy Storage

机译:氧化铜/碳核/壳纳米线阵列的可控合成及其在电化学储能中的应用

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摘要

Rational design/fabrication of integrated porous metal oxide arrays is critical for the construction of advanced electrochemical devices. Herein, we report self-supported CuO/C core/shell nanowire arrays prepared by the combination of electro-deposition and chemical vapor deposition methods. CuO/C nanowires with diameters of ~400 nm grow quasi-vertically to the substrates forming three-dimensional arrays architecture. A thin carbon shell is uniformly coated on the CuO nanowire cores. As an anode of lithium ion batteries, the resultant CuO/C nanowire arrays are demonstrated to have high specific capacity (672 mAh·g−1 at 0.2 C) and good cycle stability (425 mAh·g−1 at 1 C up to 150 cycles). The core/shell arrays structure plays positive roles in the enhancement of Li ion storage due to fast ion/electron transfer path, good strain accommodation and sufficient contact between electrolyte and active materials.
机译:集成多孔金属氧化物阵列的合理设计/制造对于高级电化学装置的构造至关重要。在这里,我们报告通过电沉积和化学气相沉积方法相结合制备的自支撑CuO / C核/壳纳米线阵列。直径约400 nm的CuO / C纳米线准垂直生长到形成三维阵列结构的基板上。薄碳壳均匀地涂覆在CuO纳米线核上。作为锂离子电池的阳极,所得的CuO / C纳米线阵列具有较高的比容量(0.2 C时为672 mAh·g -1 )和良好的循环稳定性(425 mAh·g < sup> -1 在1 C下最多150个循环)。核/壳阵列结构由于快速的离子/电子传递路径,良好的应变适应性以及电解质与活性材料之间的充分接触而在增强Li离子存储方面起着积极的作用。

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