"HOT" Alkaline Hydrolysis of Amorphous MOF Microspheres to Produce Ultrastable Bimetal Hydroxide Electrode with Boosted Cycling Stability.
"HOT" Alkaline Hydrolysis of Amorphous MOF Microspheres to Produce Ultrastable Bimetal Hydroxide Electrode with Boosted Cycling Stability.
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非晶态 MOF 微球的“热”碱性水解可生产具有增强循环稳定性的超稳定双金属氢氧化物电极。
DOI：
10.1002/smll.201904663
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发表时间：
2019-12
期刊：
影响因子：
13.3
通讯作者：
Daofeng Sun
中科院分区：
文献类型：
--
作者：
Haobing Zhang;Ben Xu;Hao Mei;Yingjie Mei;Shiyu Zhang;Zhendong Yang;Zhenyu Xiao;Wenpei Kang;Daofeng Sun
氢氧化镍/钴是一种很有前途的超级电容器电池型电极材料。然而，其低循环稳定性阻碍了进一步的应用。本文以Ni-Co-金属有机骨架（MOF）为前驱体/模板，采用特定的水解策略，成功合成了具有极长循环寿命的Ni0.7Co0.3（OH）2核壳微球。将Ni-Co-MOF和KOH水溶液分离并在混合之前加热至120 °C，而不是在加热之前混合。通过这种水解策略，产物中不存在MOF残留物，有助于氢氧化物纳米片的紧密堆叠，以产生具有坚固的核-壳结构的Ni0.7Co0.3（OH）2微球。该电极材料表现出高比容量（在0.5 A g-1下为945 C g-1）和前所未有的循环性能（10000次循环后为100%）。所制造的非对称超级电容器在400.56 W kg-1的功率密度下提供40.14 Wh kg-1的能量密度和优异的循环稳定性（20000次循环后100%）。就目前所知，纯Ni/Co（OH）2的循环性能最好。
Nickel/cobalt hydroxide is a promising battery-type electrode material for supercapacitors. However, its low cycle stability hinders further applications. Herein, Ni0.7 Co0.3 (OH)2 core-shell microspheres exhibiting extreme-prolonged cycling life are successfully synthesized, employing Ni-Co-metal-organic framework (MOF) as the precursor/template and a specific hydrolysis strategy. The Ni-Co-MOF and KOH aqueous solution are separated and heated to 120 °C before mixing, rather than mixing before heating. Through this hydrolysis strategy, no MOF residual exists in the product, contributing to close stacking of the hydroxide nanoflakes to generate Ni0.7 Co0.3 (OH)2 microspheres with a robust core-shell structure. The electrode material exhibits high specific capacity (945 C g-1 at 0.5 A g-1 ) and unprecedented cycling performance (100% after 10 000 cycles). The fabricated asymmetric supercapacitor delivers an energy density of 40.14 Wh kg-1 at a power density of 400.56 W kg-1 and excellent cycling stability (100% after 20 000 cycles). As far as is known, it is the best cycling performance for pure Ni/Co(OH)2 .
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影响因子：
6.7
作者：
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影响因子：
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作者：
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影响因子：
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