TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The conductive substrate is chosen from conductive glass, stainless metal sheet or insulation material plated with conductive metal thin-film. The carbon material is chosen from single-walled carbon nanotube, multi-walled carbon nanotube, graphite powder or middle-carbon microspheres. Preferred Property: The thickness of carbon material thin-film is 6-10 mu m.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polypyrrole derivative is poly(1-(1-7C) pyrrolidinyl) or poly(3-(1-8C) pyrrolidinyl). Preferred Property: The thickness of polypyrrole thin-film is 2-4 mu m. Preferred Process: The composite-film counter electrode is obtained by adding carbon materials in mixed acid, soaking at 50-70 degrees C for 5-7 hours, filtering, washing with distilled water until cleaning solution is neutral, drying carbon materials at 50-70 degrees C in vacuum mode for 10-15 hours, obtaining surface-modified carbon materials, scattering the surface-modified carbon materials in organic aprotic solvent, carrying out ultrasonic oscillating, scattering mixed solution for 20-40 minutes, keeping for 20-40 minutes, forming stable and suspended electrophoresis solution of carbon material, performing electrophoresis process using conductive substrate as anode, and platinum electrode as cathode for 10-20 seconds, depositing the carbon material thin-film on the substrate, drying the conductive substrate deposited with carbon material thin-film at 70-90 degrees C in vacuum mode for 3-5 hours, obtaining carbon material thin-film on the substrate, dissolving a polypyrrole or its derivative monomer in boron trifluorodiethyl etherate, forming polypyrrole or its derivative electrolytic deposition, performing a cyclic voltammetry scanning process in polypyrrole or polypyrrole derivative electrolytic deposition at scanning speed of 0.05 V/second using the conductive substrate deposited with a carbon material thin-film as work electrode, platinum electrode as counter electrode, saturated calomel electrode or silver/silver chloride electrode as reference electrode, with an initial voltage of -0.8 V for 10-20 circles in scanning range of -0.8 V to 1.6 V, taking the work electrode out to be cleaned by deionized water, and drying work electrode at 70-90 degrees C under vacuum mode for 10-15 hours. The mixed acid is the mixture containing 98 mass% of concentrated sulfuric acid and 69 mass% of concentrated nitric acid in ratio of 3:1. The ratio of content of carbon material with respect to mixed acid is 1 g:60-100 mL. The ratio of content of surface-modified carbon material with respect to organic aprotic solvent is 1 mg:1 mL. The concentration of polypyrrole or polypyrrole derivative is 15-20 mmol/L. The electrophoresis process is performed for 15 seconds.