▎ 摘　　要

NOVELTY - A platinum/graphene nanocatalyst is prepared by (A) preparation of graphene (GNS), (B) preparation of poly (diallyldimethylammonium chloride) (PDDA) functional graphene (PDDA-GNS), and (C) preparation of graphene load platinum (Pt/GNS) nano catalyst. The step (C) includes dispersing PDDA-GNS in secondary distilled water and performing ultrasound; adding hydrogen platinum chloride and continuing to ultrasound; slowly adding sodium borohydride solution under magnetic mixing condition; and offcentering obtained product, cleaning and vacuum drying to obtaining Pt/GNS catalyst. USE - Method for preparation of platinum/graphene nanocatalyst (claimed). ADVANTAGE - The prepared catalyst has uniform grain diameter and controllable dimension. DETAILED DESCRIPTION - Platinum/graphene nanocatalyst is prepared by: (A) preparation of graphene (GNS), (B) preparation of poly (diallyldimethylammonium chloride) (PDDA) functional graphene (PDDA-GNS), and (C) preparation of graphene load platinum (Pt/GNS) nano catalyst. Step (A) includes: (1) adding graphite (1.0 g) and sodium nitrate (NaNO3) (1.0 g) to 98% sulfuric acid (H2SO4) solution (46 mL) and agitating for 20 minutes using ice bath machine; (2) slowly adding potassium permanganate (KMnO4) (6.0 g) and secondary distilled water (80 mL) and controlling temperature at 90 plus minus 5 degrees C; (3) continuing to agitate for 30 minutes, adding secondary distilled water (200 mL) in reaction system and slowly adding 30 wt.% hydrogen peroxide (H2O2) solution (6 mL); (4) filtering in hot condition and cleaning filter fluid via secondary distilled water until filter fluid is neutral; and (5) dispersing obtained product in secondary distilled water (500 mL) and performing ultrasound process at 150-200W for 2 hours to obtain uniformly dispersed single graphene. The step (B) includes dispersing graphene (21 mg) into 1 mol/L sodium chloride (NaCl) solution (50 mL); performing ultrasound process at 150-200W for 1 hour; adding diallyldimethylammonium chloride (80 mg) and continuing to ultrasound for 1.5 hours at 150-200W; offcentering reaction fluid and cleaning using secondary distilled water, where offcenter cleaning rotating speed is 8000-10000 revolutions/minute (rpm) for 3-5 minutes; and vacuum drying for 48 hours at 40 degrees C to obtain poly (diallyldimethylammonium chloride) functional graphene. The step (C) includes dispersing PDDA-GNS (10.8 mg) in secondary distilled water (30 mL) and performing ultrasound for 30 minutes at 150-200W; adding hydrogen platinum chloride (10.8-91.8 mg) and continuing to ultrasound for 30 minutes at 150-200W; slowly adding 0.05M sodium borohydride solution under magnetic mixing condition at rotating speed of 200-350 rpm; offcentering obtained product and cleaning using secondary distilled water; vacuum drying for 48 hours at 40 degrees C to obtaining Pt/GNS catalyst.