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首页> 外文期刊>Journal of power sources >Cathodic deposition and characterization of tin oxide coatings on graphite for electrochemical supercapacitors
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Cathodic deposition and characterization of tin oxide coatings on graphite for electrochemical supercapacitors

机译：电化学超级电容器在石墨上的氧化锡涂层的阴极沉积和表征

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摘要

Amorphous tin oxide (SnO_x) was cathodically deposited onto graphite electrode in a bath containing 0.1 M stannous chloride (SnCl_2), 0.5M sodium nitrate (NaNO_3), and 0.4M nitric acid (HNO_3) in an aqueous solution of 50% (v/v) ethanol. The SnO_x coatings grown on graphite were characterized as typical capacitive behaviors by cyclic voltammetry (CV), chronopotentiometric (CP) in 0.5 M KC1. Specific capacitance (in millifarad per square centimeter, C_a) changes linearly with the deposition charge up to 4.5 C cm~(-2), and a maximum of as high as 355 mFcm~(-2) was obtained with the SnO_x coating grown at around 5 C cm~(-2). For the SnO_x coating deposited at 0.2 C cm~(-2), a maximum specific capacitance (in farad per gram, C_m) of 298 and 125 F g~(-1) was achieved from CVs at a scan rate of 10, and 200 mV s~(-1), respectively. The value of C_m significantly gets lower from 265 to around 95Fg~(-1) when the deposition charge increases from 0.2 to around 6.0 C cm~(-2). The long cycle-life and stability of the SnO_x coatings on graphite via the presented cathodic deposition were also demonstrated.
机译：在50％（v / v）的水溶液中，在含有0.1 M氯化亚锡（SnCl_2），0.5M硝酸钠（NaNO_3）和0.4M硝酸（HNO_3）的浴中，将无定形氧化锡（SnO_x）阴极沉积在石墨电极上。 v）乙醇。在0.5 M KCl中，通过循环伏安法（CV），计时电位法（CP）将石墨上生长的SnO_x涂层表征为典型的电容行为。比电容（每平方厘米毫法里的C_a）随沉积电荷增加至4.5 C cm〜（-2）线性变化，并且在250°C下生长的SnO_x涂层获得的最大值高达355 mFcm〜（-2）。大约5 C cm〜（-2）。对于以0.2 C cm〜（-2）沉积的SnO_x涂层，以10的扫描速率从CV可获得298和125 F g〜（-1）的最大比电容（以法每克C_m为单位）。分别为200 mV s〜（-1）。当沉积电荷从0.2 C cm〜（-2）增加时，C_m值从265显着降低到95Fg〜（-1）。还证明了通过提出的阴极沉积，石墨上的SnO_x涂层的长循环寿命和稳定性。

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