Supercapacitors incorporating hollow cobalt sulfide hexagonal nanosheets
Supercapacitors incorporating hollow cobalt sulfide hexagonal nanosheets
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DOI：
10.1016/j.jpowsour.2011.03.072
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发表时间：
2011-09
期刊：
影响因子：
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通讯作者：
Zusing Yang;Chia-Ying Chen;Huan‐Tsung Chang
中科院分区：
文献类型：
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作者：
Zusing Yang;Chia-Ying Chen;Huan‐Tsung Chang
以Co(NO3)2和硫乙酰胺为原料，在聚乙烯吡咯烷酮（PVP）存在下，在100℃碱性条件下制备了空心硫化钴（CoS）六方纳米片（HNSs）。在500个计数中，所制备的空心CoS HNSs平均边缘长度约为110±27 nm，外壳厚度为16±4 nm。通过滴干工艺将CoS - HNSs沉积在透明掺氟氧化锡（FTO）衬底上，制备了两种类型的超级电容器（SCs）；高速率和大的单位面积电容。本研究使用的电解液为KOH（aq）。在64.6 a g−1的放电电流密度下，CoS HNSs （8 μg cm−2）电极表现出优异的容量性能，包括高能量密度（13.2 h kg−1）、功率密度（17.5 kW kg−1）、能量输出效率（81.3 ~ 85.3%）和稳定的循环寿命（超过10,000次循环）。CoS - HNSs充放电速度快（<3 s），具有高倍率SCs的特点。具有高质量负载（9.7 mg cm−2）的CoS - HNS SCs的单位面积电容分别为1.35 F cm−2和138 F g−1，显示出具有大单位面积电容的SCs的特性。我们的研究结果表明，CoS - HNS电极在汽车和计算机工业等许多领域具有很大的应用潜力。
We have prepared hollow cobalt sulfide (CoS) hexagonal nanosheets (HNSs) from Co(NO3)2and thioacetamide in the presence of poly(vinylpyrrolidone) (PVP) at 100 °C under alkaline condition. The as-prepared hollow CoS HNSs have an average edge length ca. 110 ± 27 nm and an outer shell of 16 ± 4 nm in thickness from 500 counts. The CoS HNSs are deposited onto transparent fluorine-doped tin oxide (FTO) substrates through a drop-dry process to prepare two types of supercapacitors (SCs); high rate and large per-area capacitance. The electrolyte used in this study is KOH(aq). The CoS HNSs (8 μg cm−2) electrodes exhibit excellent capacity properties, including high energy density (13.2 h kg−1), power density (17.5 kW kg−1), energy deliverable efficiency (81.3–85.3%), and stable cycle life (over 10,000 cycles) at a high discharge current density of 64.6 A g−1. With their fast charging and discharging rates (<3 s), the CoS HNSs show characteristics of high-rate SCs. The CoS HNS SCs having high mass loading (9.7 mg cm−2) provide high per-area capacitance of 1.35 F cm−2and per-mass capacitance of 138 F g−1, respectively, showing characteristics of SCs with large per-area capacitance. Our results have demonstrated the potential of the CoS HNS electrodes hold great practical potential in many fields such as automobile and computer industries.