Controlled Synthesis, Characterization And Electrocatalyst Performance Of Platinum-Based Nanocrystals

With the rapid development of China's economy, people's needs for energy is also growing and traditional fossil fuel such as coal, oil in use process will produce some air pollution damage to the environment, and they are non renewable resources, reserves on earth is limited. So finding a sustainable, efficient and clean energy is very urgent and necessary of, chosen as the ideal of the future energy storage and conversion device, fuel cell with energy density high, carry convenient and environmentally friendly features. At present, Pt-based nanocatalysts are widely used in fuel cell catalysts, due to limitations of the Pt metals on earth reserves are scarce and expensive price of their large-scale use. Therefore, under the condition of maintaining the activity and stability of catalyst, reduce the content of Pt so as to reduce the cost of low fuel cell catalyst is a challenging issue.In this paper, Pt-based nanocatalysts for development of high activity and stability as the goal, the design and preparation of several Pt-based nanocatalysta, and explore their electrocatalytic properties.(1) Preparing of PdPt, RhPdPt island shaped nano crystals and its composition controllable, because the surface is full of active site, in electrocatalytic properties of the inquiry found that acidic conditions the electrocatalytic oxidation of methanol, Pd50Pt50 island shaped nano crystal showed a is better than that of commercial Pt black catalytic activity and stability. Electrocatalytic oxidation of ethanol in alkaline conditions, Rh10Pd40Pt50 and Pd50Pt50 nano crystal Island exhibits excellent catalytic activity and stability of the commercial Pt black.(2) Ascorbic acid as a reducing agent, cetyltrimethylammonium chloride sodium as a surfactant, water as solvent, at 85 ?,preparing of based-Pt unary, binary, ternary flower like nanocrystals(Pt, PdPt, RhPt and RhPdPt). The composition of the pdpt can by controlling the amount of metal precursor to regulate and electrocatalytic oxidation of ethylene glycol, glycerol, ethanol and methanol, compared to the commercial Pt black, the PdPt flower like nanocrystals show excellent catalytic activity and stability.(3) Preparing of RhPt flower like nanocrystals, and the morphology is not with the change in the composition and change, for the electrocatalytic oxidation of methanol, RhPt flower like nanocrystals showed catalytic activity and stability than that of commercial Pt black, RhPt flowers peak electricity of nanocrystalline methanol oxidation more commercial Pt black and forward, which Rh33Pt67 flower like nanocrystals oxygen more commercial Pt black and forward the 110 mV.