Preparation method of high-performance superlow-palladium-capacity anode electrocatalyst Pd-CoP/C of direct formic acid fuel cell

Abstract

The invention relates to a preparation method of a high-performance superlow-palladium-capacity anode electrocatalyst Pd-CoP / C of a direct formic acid fuel cell and belongs to the technical field of fuel cells. The preparation method comprises the following steps: dispersing a carrier and cobalt chloride hexahydrate in water, drying to obtain a first compound carrier by distillation after ultrasonic dispersing and stirring; mixing and grinding the first compound carrier and hydrated sodium hypophosphite for one-hour reaction, and washing and drying the reactant to obtain a second compound carrier; dispersing the second compound carrier in glycol, adding hexachloropalladate, and performing ultrasonic dispersing and stirring to obtain a first turbid liquid; stirring the first turbid liquid at the room temperature, and regulating the pH value with sodium hydroxide to obtain a second turbid liquid; performing microwave radiation on the second turbid liquid, and obtaining a supported palladium catalyst. The palladium-based catalyst prepared by the method has extremely high catalytic activity and relatively high stability to formic acid electro-oxidation. Meanwhile, the capacity of the precious metal palladium can be reduced, and the method is simple to operate, short in preparation period and suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for preparing a high-performance ultra-low palladium loading fuel cell anode electrocatalyst Pd-CoP / C for direct formic acid use. Background technique [0002] As an alternative fuel to methanol, direct formic acid fuel (DFAFC) cells have received a lot of attention in recent years. Like methanol, formic acid contains only one carbon atom, no C-C bond, easy to oxidize, cheap and abundant. Not only that, but formic acid has many advantages over methanol: formic acid is non-toxic compared with methanol, and is approved by the US Food and Drug Administration as a food additive; it is non-flammable, safe and convenient for storage and transportation; the theoretical electromotive force of DFAFC is at 25°C at 1.48V, in several proton exchange membrane fuels (CH 3 OH,HCHO,H 2 ) batteries, DFAFC has the highest theoretical open circuit voltage; when formic acid is used as...

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Problems solved by technology

However, the above preparation methods have their own shortcomings. For example, the preparation of Pd-M (M=Pt, Ir, Sn, Au, Co, etc.) can improve the activity of the catalyst to a certain extent, but the dissolution and aggregation of M in the battery environment is fatal. At the same time, Pd, Pt, Au, etc., as noble metals, cannot be widely developed and applied, and the current technical level is limited to the research stage; although non-metallic phosphorus doping can improve the stability of the catalyst to a certain extent, it does not affect the catalytic activity. but very limited

[0005] In addition, in order to reduce the mass transfer resistance, increasing the catalyst noble metal loading is also a way to improve battery performance, but under high loading conditions, noble metal nanoparticles are prone to agglomeration, which will reduce the utilization rate of noble metals. The loading capacity is insufficient to realize the low cost and economic benefits of fuel cells

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