Controllable one-pot synthesis of emerging β-Cu2Se nanowire freely standing on nickel foam for high electrochemical energy storage performance

Controllable one-pot synthesis of emerging β-Cu2Se nanowire freely standing on nickel foam for high electrochemical energy storage performance
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新兴β-Cu2Se纳米线的可控一锅合成自由站立在泡沫镍上,具有高电化学储能性能

DOI:
10.1016/j.apsusc.2018.08.147
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发表时间:
2019
影响因子:
6.7
通讯作者:
Xianfa Zhang
Xianfa Zhang
中科院分区:
材料科学1区
文献类型:
--
作者:
Panpan Xu;Guiling Wang;Chenxu Miao;Kui Cheng;Ke Ye;Kai Zhu;Jun Yan;Dianxue Cao;Xianfa Zhang

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过渡金属硒化物由于其优异的导电性,在能量存储和转换方面引起了广泛的研究兴趣。具有特殊晶体结构的β-Cu2Se被认为是超离子导体,其扩散系数与液体一样大。采用简单的一步溶剂热生长法,在4 h的时间内,制备了均匀致密的纳米线直接在泡沫镍上相互交叉的离子和电子快速导体β-Cu2Se。电子和离子转移的特性更获益使β-Cu2Se-4h电极提供特定容量高达182.4马  h g−1的电流密度2 马 厘米−2,仍然是105.6马  h g−1即使在高电流密度的50 马 厘米−2,和优秀的循环稳定后85%的重复充放电10000次。所制备的非对称超级电容器(β-Cu2Se-4h//AC)的最大能量和功率密度分别为48 Wh kg−1和5500 W kg−1。
Transition metal selenide has stimulated much research interest in energy storage and conversion, due to its excellent electrical conductivity. β-Cu2Se with special crystal structure is considered as super-ionic conductor, of which the diffusion coefficient is as large as a liquid. The fast ions and electrons conductor β-Cu2Se with uniformly dense nanowire crossing with each other directly on nickel foam is prepared via simple one-step solvothermal grow method for 4 h, avoiding conductive agent and binder. The feature much benefitting for electrons and ions transfer enable the β-Cu2Se-4h electrode delivers specific capacity as high as 182.4 mA h g−1at current density of 2 mA cm−2, which is still 105.6 mA h g−1even at high current density of 50 mA cm−2, and excellent cycling stability of 85% after repetitively charge-discharge 10,000 times. The fabricated asymmetric supercapacitor (β-Cu2Se-4h//AC) achieves maximum energy and power density is 48 Wh kg−1and 5500 W kg−1.
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