▎ 摘　　要

NOVELTY - A graphene/nickel-aluminum hydroxide composite material preparation method involves dispersing graphite oxide in water, and performing ultrasonic treatment to obtain graphene oxide dispersion liquid. The obtained liquid is added to supporting electrolyte, followed by controlling potential value, performing potential electrolysis, and washing resultant electrolyte to obtain graphene modified electrode. The obtained electrode is added to precursor solution containing nickel salt and aluminum salt and supporting electrolyte, and performing potential electrolysis to obtain final product. USE - Method for electrochemically preparing graphene/nickel-aluminum hydroxide composite material for a super capacitor. ADVANTAGE - The method enables preparing graphene/nickel-aluminum hydroxide composite material in an inexpensive manner. DETAILED DESCRIPTION - A graphene/nickel-aluminum hydroxide composite material preparation method involves dispersing graphite oxide in deionized water at a concentration of 0.0001-0.1 g/ml, and performing ultrasonic treatment at 55-60 kHz for 10-20 minutes to obtain graphene oxide dispersion liquid. The obtained liquid is added to supporting electrolyte having concentration of 0-5.0 mol/l, by controlling potential value to -0.9--1.2 V, maintaining temperature to 0-50 degrees C, performing constant potential electrolysis at 50-70 degrees C for 10-60 seconds, taking out resultant electrolyte and washing using de-ionized water to obtain graphene modified electrode. The obtained electrode is added to precursor solution containing nickel salt and aluminum salt, where the amount ratio of nickel salt and the aluminum salt is 1:6-6:1, and concentration of nickel salt and aluminum salt is 0.001-1.0 mol/l. The obtained product is added to supporting electrolyte having concentration of 0-5.0 mol/l, followed by controlling potential value to minus 0.9V to minus 1.2V, maintaining temperature to 0-50 degrees C, performing constant potential electrolysis at 50-70 degrees C for 10-60 seconds, taking out resultant electrolyte and washing using de-ionized water to obtain finished product.