▎ 摘　　要

NOVELTY - Preparing platinum/vertically oriented graphene composite material electrocatalyst comprises (i) arranging substrate and needle-shaped electrodes in a quartz tube; (ii) introducing hydrogen into quartz tube and heating substrate; (iii) introducing methane, argon gas and water vapor into the quartz tube, and achieving vertical growth of graphene nanosheets on the substrate surface; (iv) preparing vertically oriented graphene catalyst; (v) carrying out electrochemical deposition of platinum nanoparticles on vertically oriented graphene catalyst carrier surface; and (vi) drying. USE - The method is useful for preparing platinum/vertically oriented graphene composite material electrocatalyst (claimed). ADVANTAGE - The electrocatalyst: has no graphene agglomeration phenomenon and improves the nanocatalyst carrier deposition per unit volume of the carrier, ensures complete utilization of specific surface area, and the distance is controllable. DETAILED DESCRIPTION - Preparing platinum/vertically oriented graphene composite material electrocatalyst comprises (i) arranging substrate and needle-shaped electrodes in a quartz tube, where the spacing of substrate and needle-shaped electrode is 5-10 mm, the needle-shaped electrodes are arranged along the axial direction of the quartz tube and perpendicular to the substrate, the substrate is ground, the needle-shaped electrode is connected with 10000 V direct current high voltage, the outside of the quartz tube is wound with electric heating wire and the quartz tube opening is provided with air outlet; (ii) introducing hydrogen into quartz tube, opening the electric heating and heating substrate to 700-1000 degrees C; (iii) introducing methane, argon gas and water vapor into the quartz tube, opening the direct current high voltage and generating electrical field in large curvature surface of the needle-shaped electrode, ensuring the formation of normal pressure glow discharge plasma between the substrate and the needle-shaped electrode, ionizing and decomposing methane and water vapor by high-energy electrons and active groups in the plasma, and achieving vertical growth of graphene nanosheets on the substrate surface; (iv) closing the direct current high voltage and methane, argon gas and water vapor for 5 minutes, introducing hydrogen into the quartz tube, closing the electric heating and cooling the resulting material to the room temperature to obtain vertically oriented graphene catalyst carrier under hydrogen atmosphere protection; (v) applying constant voltage using vertically oriented graphene catalyst carrier as working electrode, platinum wire as counter electrode, saturated calomel electrode as reference electrode, chloroplatinic acid solution as electrolyte and sulfuric acid solution as supporting electrolyte, and carrying out electrochemical deposition of platinum nanoparticles on vertically oriented graphene catalyst carrier surface under nitrogen atmosphere; and (vi) drying the resulting material at room temperature.