▎ 摘　　要

NOVELTY - Preparing graphene/lanthanum-iron-boron series low temperature hydrogen storage alloy composite comprises e.g. (i) preparing graphene by using improved Hummers method, (ii) preparing alloy powder purity of more than 99.9% of the alloy material lanthanum, iron, nickel, manganese, boron and aluminum, mechanical cooling and natural cooling, using mortar for grinding and forming, (iii) preparing graphene/alloy composite hydrogen storage material graphene and alloy powder, placing the graphene and the alloy powder in a ball mill jar, taking the high pure argon as protective gas and ball milling. USE - The method is useful for preparing graphene/lanthanum-iron-boron series low temperature hydrogen storage alloy composite (claimed). ADVANTAGE - The method: good discharge performance under the low-temperature condition. DETAILED DESCRIPTION - Preparing graphene/lanthanum-iron-boron series low temperature hydrogen storage alloy composite comprises (i) preparing graphene by using improved Hummers method to obtain graphene oxide, taking graphite powder, sodium nitrate, potassium permanganate and concentrated sulfuric acid in a ratio of 1:1-2:6-8:87-97, mixing graphite powder and sodium nitrate, adding concentrated sulfuric acid concentration of 98%, intense mixing while adding small amount of potassium permanganate, stirring in a ice-water bath, reacting for 2 hours, during this period has been intense stirring, controlling temperature at 35-50 degrees C, continuously stirring at the same time according to 100 g of the above mixture, adding 0-200 ml distilled water, stirring and reacting for 0.75-3 hours, continuously heating at 80-95 degrees C, every 100 g of the above mixture, further adding with 0-400 ml distilled water, reacting for 15-30 minutes, cooling at 75-85 degrees C, according to the amount of each 95 -105 g reactant, adding 10 ml hydrogen peroxide solution, adding repeatedly small amount with dropper concentration of 30% hydrogen peroxide solution, until the reactant is not bubbling and the solution is golden, allowing to stand for 0.5-1 hours, according to 1000 ml hydrochloric acid, adding 200-300 g golden yellow solution, adding 5% hydrochloric acid to the golden yellow solution, aging for two days, removing impurities, rinsing with deionized water until neutral, filtering, drying at 40-60 degrees C to obtain oxidized graphite, adding dried graphite oxide into the crucible, placing in the microwave oven at 300-500 degrees C for microwave for 1 minute to obtain graphene, (ii) preparing alloy powder purity of more than 99.9% of the alloy material lanthanum, iron, nickel, manganese, boron and aluminum, according to the corresponding ratio placing in the melting furnace, according to the melting point from low to high sequentially into the melting tank, using smelting methods, inletting high pure argon as protective gas, over two to three times in the process of smelting to obtain uniform composition lanthanum-iron-nickel-manganese-boron-aluminum complex (La15Fe2Ni72Mn7B2Al2) alloy ingots, mechanical cooling and natural cooling, using mortar for grinding and forming the powder less than 200 meshes, (iii) preparing graphene/alloy composite hydrogen storage material graphene and alloy powder in a mass of 1-5:95-99, placing the graphene obtained in the step (i) and the alloy powder obtained in the step (iii), placing in a ball mill jar, taking the high pure argon as protective gas, ball milling for 1 hour to obtain graphene/lanthanum-iron-boron series low temperature hydrogen storage alloy composite.