Effective NaBH4-exfoliated ultrathin multilayer Co(OH)2 nanosheets arrays and sulfidation for energy storage
Effective NaBH4-exfoliated ultrathin multilayer Co(OH)2 nanosheets arrays and sulfidation for energy storage
复制标题
有效的NaBH4剥离超薄多层Co(OH)(2)纳米片阵列和硫化用于储能
DOI：
10.1088/1361-6528/aac158
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发表时间：
2018-07-20
期刊：
影响因子：
3.5
通讯作者：
Tang, Yiwen
中科院分区：
文献类型：
--
作者：
Yang, Wanjun;Qu, Gan;Tang, Yiwen
轻便工程超薄纳米结构材料仍然是材料科学面临的巨大挑战。其中，去角质策略显示出很大的优势。在这项工作中，我们开发了一种简便的方法，通过NaBH4-剥离法将Co(OH)(2)纳米片剥离成超薄的Co(OH)(2)纳米片。此外，通过改变剥离时间可以方便地控制Co(OH)(2)纳米片的微观结构。结果表明，得到的Co(OH)(2)-72h超薄纳米片具有优异的电化学性能。为了改善Co(OH)(2)的储能性能，对得到的超薄Co(OH)(2)纳米片进行了进一步的硫化修饰，以提高其导电性。结果表明，合成的Co(OH)(2)-72h/CoS2复合材料在1Ag(-1)下的比容为2536Fg(-1)，比Co(OH)(2)-72h的比容量高得多，10000次循环后的容量保持率为83.3%。此外，组装的非对称超级电容器在36Wh kg(-1)的能量密度下显示出482W kg(-1)的功率密度，显示出很大的应用潜力。
Facile engineering ultrathin nano structural materials is still a huge challenge for material science. Thereinto, the strategy of exfoliating shows great advantages. In this work, we develop a convenient approach to exfoliate Co(OH)(2) nanosheets into ultrathin Co(OH)(2) nanoflakes through NaBH4-exfoliation method. Moreover, the microstructures of the Co(OH)(2) nanosheets are conveniently controlled by varying the exfoliation time. As a result, the obtained ultrathin Co(OH)(2)-72 h nanosheets deliver the excellent electrochemical performance. In order to improve the energy storage properties, the obtained ultrathin Co(OH)(2) nanosheets are further modified to enhance the conductivity via sulfidation. Consequently, the synthesized Co(OH)(2)-72 h/CoS2 composites exhibit a specific capacitance of 2536 F g(-1) at 1 A g(-1), which is more outstanding than that of Co(OH)(2)-72 h. What's more, the Co(OH)(2)-72 h/CoS2 composites show a capacitance retention of 83.3% after 10 000 cycles. Besides, the assembled asymmetric supercapacitor displays a power density of 482 W kg(-1) at an energy density of 36 Wh kg(-1), demonstrating a large potential for application.