▎ 摘　　要

NOVELTY - The method involves introducing mixed gas of hydrogen and carbon source gas into a liquid metal heated to growth temperature in a hydrogen atmosphere environment (S11). Mixed gas bubbles in the liquid metal are formed by the mixed gas. Cracking reaction in the liquid metal is generated by the carbon source gas to generate graphene and hydrogen. Graphene bubble rising to a surface of the liquid metal and exhaust gas is collected (S12) to purify the exhaust gas to obtain hydrogen, where the liquid metal comprises copper, copper and silver, germanium, palladium, nickel, tin, cobalt, chromium, antimony, gallium, lead, bismuth and zirconium alloy. USE - High-quality graphene powder growth and synchronous hydrogen production method. ADVANTAGE - The method enables realizing synchronous preparation of the graphene-layer and high-quality graphene, and reducing carbon-source gas content in the bubble by introducing mixed gas of hydrogen and carbon source gas in the liquid metal, so as to reduce graphene nucleation rate on the surface of the bubble, thus effectively etching the defective graphene crystal nucleus and defect graphene hydrogen to effectively inhibit disordered growth of the cracking dehydrogenation free radical, and finally obtaining the graphene powder with less layer and high quality. The method enables mixing hydrogen generated by cracking with the hydrogen in the mixed gas to form high concentration hydrogen, so that impurity gas content of the exhaust gas is less than 1 percentage, which is better for subsequent gas purification, thus obtaining high-purity graphene powder. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a high-quality graphene powder growth and synchronous hydrogen production device. DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram illustrating a high-quality graphene powder growth and synchronous hydrogen production method. (Drawing includes non-English language text). S11Introducing mixed gas of hydrogen and carbon source gas into liquid metal heated to growth temperature in hydrogen atmosphere environment S12Collecting graphene bubble rising to surface of liquid metal and exhaust gas to purify exhaust gas to obtain hydrogen