Cathodic deposition and characterization of tin oxide coatings on graphite for electrochemical supercapacitors
Cathodic deposition and characterization of tin oxide coatings on graphite for electrochemical supercapacitors
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DOI：
10.1016/j.jpowsour.2007.09.062
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发表时间：
2008-01
影响因子：
9.2
通讯作者：
Mengqiang Wu;Liping Zhang;Dongmei Wang;Chao Xiao;Shuren Zhang
中科院分区：
文献类型：
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作者：
Mengqiang Wu;Liping Zhang;Dongmei Wang;Chao Xiao;Shuren Zhang
在含有0.1M氯化亚锡（SnCl 2）、0.5M硝酸钠（NaNO 3）和0.4M硝酸（HNO 3）的50%（v/v）乙醇水溶液的浴中，将无定形氧化锡（SnOx）阴极沉积到石墨电极上。在0.5MKCl溶液中，用循环伏安法（CV）、计时电位法（CP）对石墨表面生长的SnOx涂层进行了表征。比电容（单位：毫法每平方厘米，Ca）在4.5Ccm−2以下随沉积电荷线性变化，在5Ccm−2左右生长的SnOx涂层获得的最大值高达355 mFcm − 2。对于在0.2Ccm−2下沉积的SnOx涂层，在10和200 mVs −1的扫描速率下分别从CV获得了298和125 Fg − 1的最大比电容（法拉/克，Cm）。当沉积电荷从0.2增加到约6.0Ccm-2时，Cm的值从265显著降低到约95 Fg-1。通过阴极沉积在石墨上的SnOx涂层的长循环寿命和稳定性也被证明。
Amorphous tin oxide (SnOx) was cathodically deposited onto graphite electrode in a bath containing 0.1M stannous chloride (SnCl2), 0.5M sodium nitrate (NaNO3), and 0.4M nitric acid (HNO3) in an aqueous solution of 50% (v/v) ethanol. The SnOxcoatings grown on graphite were characterized as typical capacitive behaviors by cyclic voltammetry (CV), chronopotentiometric (CP) in 0.5M KCl. Specific capacitance (in milli-farad per square centimeter, Ca) changes linearly with the deposition charge up to 4.5Ccm−2, and a maximum of as high as 355mFcm−2was obtained with the SnOxcoating grown at around 5Ccm−2. For the SnOxcoating deposited at 0.2Ccm−2, a maximum specific capacitance (in farad per gram, Cm) of 298 and 125Fg−1was achieved from CVs at a scan rate of 10, and 200mVs−1, respectively. The value of Cmsignificantly gets lower from 265 to around 95Fg−1when the deposition charge increases from 0.2 to around 6.0Ccm−2. The long cycle-life and stability of the SnOxcoatings on graphite via the presented cathodic deposition were also demonstrated.