Anion exchange strategy to synthesis of porous NiS hexagonal nanoplates for supercapacitors
Anion exchange strategy to synthesis of porous NiS hexagonal nanoplates for supercapacitors
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DOI：
10.1088/1361-6528/28/6/065406
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发表时间：
2017-02-10
期刊：
影响因子：
3.5
通讯作者：
Lou, Zhengsong
中科院分区：
文献类型：
--
作者：
Li, Zhongchun;Yu, Xuewei;Lou, Zhengsong
一种简便的阴离子交换策略被应用于合成多孔 NiS 六角纳米板（NiS HNP）作为超级电容器的电极材料。研究发现，Na2S 浓度是获得具有明确结构的多孔 NiS 六方纳米板的关键因素。多孔NiS六方纳米板在1 A g(-1)电流密度下表现出1897 F g(-1)的比电容。 NiS HNPs//活性炭（AC）非对称超级电容器（ASC）具有长循环寿命（在3 A g(-1)的电流密度下循环4000次后容量保持率约为100%），在约30 mg的大负载质量下最大能量密度为11.6 Wh kg(-1)。令人印象深刻的是，两个串联的 NiS HNP//AC ASC 可以点亮红色 LED 约 30 分钟。 NiS HNPs 卓越的电化学性能归因于其独特的分层多孔结构。阴离子交换法是合成高性能金属硫化物的一种简便且通用的策略，可用于储能。
A facile anion exchange strategy was applied to the synthesis of porous NiS hexagonal nanoplates (NiS HNPs) as an electrode material for supercapacitors. It was found that Na2S concentration is a key factor to achieve porous NiS hexagonal nanoplates with well-defined architecture. Porous NiS hexagonal nanoplates exhibited a specific capacitance of 1897 F g(-1) at a current density of 1 A g(-1). NiS HNPs//activated carbon (AC) asymmetric supercapacitor (ASC) shows a long cycle lifespan (about 100% capacity retention after 4000 cycles at a current density of 3 A g(-1)) with a maximum energy density of 11.6 Wh kg(-1) at a large loading mass of about 30 mg. Impressively, two NiS HNPs//AC ASCs in series could light up a red LED for about 30 min. The remarkable electrochemical performance of NiS HNPs is ascribed to their unique hierarchical porous architectures. The anion exchange method is a facile and versatile strategy for the synthesis of metal sulfides with high performance for energy storage.