▎ 摘　　要

NOVELTY - Reduced graphene oxide-copper selenide (rGO-Cu2Se) film is synthesized from a substrate by immersing substrate in aqueous mixture of copper compound and sodium selenosulfate to form rGO-Cu2Se film on the surface of substrate for 30-310 minutes. Concentration of Cu compound is 0.05-0.5 M, and copper compounds are copper(II) chloride (CuCl2), copper sulfate (CuSO4), and copper nitrate (Cu(NO3)2). Concentration of sodium selenosulfate is 0.05-0.25 M. The pH of the aqueous mixture of the solution is 8 plus minus 0.1 to 12 plus minus 0.1. USE - Synthesis of reduced graphene oxide-copper selenide film from a substrate for electrochemical energy storage device with specific capacitance value of 426 F/gm (claimed). ADVANTAGE - The solution growth method is a user friendly, cost-effective, and convenient method to obtain coating of various inorganic materials. Material coating can be possible on any conducting and nonconducting material and thickness can be easily controlled by manipulating various preparative parameters, such as temperature of bath, time of coating, concentrations of initial precursors, pH of solution bath, etc.; can be worked at relatively low temperature and convenient to obtain large area coating of material; does not require sophisticated instrumentation as in vacuum evaporation and sputtering methods of thin coating; can minimize material wastage compared with resistive heating and sputtering methods; and can easily produce a variety of nanostructures at the micro-surface of coating material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for thin coating of rGO-Cu2Se from chemical method on stainless steel and glass substrates.