▎ 摘　　要

NOVELTY - Preparing graphene-alkenyltetrahydro-Pd double-metal nano-composite material involves dispersing graphene oxide in distilled water, adding iron chloride solution and platinum-tungsten platinum-based metal catalyst precursor solution for dispersing and mixing, adding aniline monomers and concentrated phosphoric acid to mix, dissolving the concentrated phosphic acid solution with ammonium persulfate to react to obtain a solid product, filtering the solid product through a mixed film with a preset aperture, washing with distilled water and washing with ethanol, adding the obtained powder product into a phospholic acid solution containing ascorbic acid (AA) for stirring and mixing. The product is filtered and washed with alcohol, washed with ethanol and dried naturally. USE - The graphene-based Pt-Pd double-metal nano-composite material used in catalysis, sensor, environment and energy. ADVANTAGE - The graphene-based Pt-Pd double-metal nano-composite material has excellent catalytic performance to UA, can simultaneously detect UA and DA, and has high sensitivity, linear range of graphite alkenyl, and provides modified electrode with high sensitivity and wide linear range. The modified electrode can effectively solve the UA test process, the detection limit of UA is poor and the anti-interference problem of DA. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: 1. The preparation method of graphene-based Pt-Pd double-metal nano-composite material, which involves stirring and dispersing 50mg of graphene oxide in 50ml of distilled water to obtain graphene oxide dispersion, adding 200 mu 0.1M of iron(III) chloride solution and preset dosage of platinum, palladium of Pt, Pd of platinum metal catalyst precursor solution into the graphene oxide dispersion liquid and carrying out ultrasonic dispersion for 10 min, continuously stirring for 1h, adding 50 mu aniline monomer into the solution prepared, stirring for 10 min, adding 2g concentrated phosphoric acid and continuously stirring for 8 h, taking 0.3g ammonium persulfate, adding 5 ml 10 % phosphoric acid solution, after completely dissolving, slowly dropping the solution to the solution obtained, after finishing dripping, continuously stirring and reacting for 1h to obtain the solid product, filtering the solid product with mixed film of 220nm aperture, and then washing by distilled water and ethanol, obtaining powder product, adding the powder product into 50 ml of 2 % phosphoric acid solution containing 100mM AA for stirring and mixing for 24h, then filtering the obtained product, water washing, alcohol washing, then naturally drying to obtain the PANI-rGO-PtPd nano catalyst powder. 2. A modified electrode preparation method based on graphene-based Pt-Pd double-metal nano-composite material, which involves using 5 mm of glassy carbon electrode, washing with distilled water, cleaning with absolute ethyl alcohol and distilled water for ultrasonic cleaning treatment, after finishing processing drying for further use, dispersing the 2mgPANI-rGO-PtPd nano catalyst powder and 10 microlitres of 5 % Nafion ethanol solution in 0.5ml of ethanol and ultrasonically processing for 30 min to form a uniform mixed suspension, dripping the mixed suspension obtained to obtain the glass-carbon electrode surface and drying at room temperature to obtain the modified electrode based on graphene-based Pt-Pd double-metal nano-composite material. 3. Modified electrode based on graphene-based Pt-Pd double-metal nano-composite material is prepared by the preparation method. DESCRIPTION OF DRAWING(S) - The drawing shows a representation of the composite material of the present invention, wherein FIG. 1 A is a PANI-rGO nano-catalyst carrier surface of the SEM image, FIG. 1 B is a partial amplified drawing; FIG. 1 C is a PANI-rGO-PtPd nano-catalyst surface topography, FIG. 1 D is an internal structure thereof.