Amorphous tin oxide (SnO x ) 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 SnO x coatings 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, C a) changes linearly with the deposition charge up to 4.5Ccm−2, and a maximum of as high as 355mFcm−2 was obtained with the SnO x coating grown at around 5Ccm−2. For the SnO x coating deposited at 0.2Ccm−2, a maximum specific capacitance (in farad per gram, C m) of 298 and 125Fg−1 was achieved from CVs at a scan rate of 10, and 200mVs−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 6.0Ccm−2. The long cycle-life and stability of the SnO x coatings on graphite via the presented cathodic deposition were also demonstrated.