Low-platinum composite material based on tungsten oxide/graphene aerogel as well as preparation method and application of low-platinum composite material

Abstract

The invention discloses a low-platinum composite material based on tungsten oxide/graphene aerogel and a preparation method and application thereof. The preparation method comprises the steps: synthesizing tungsten oxide/graphene hydrogel through a simple and easy one-step hydrothermal gel forming method, and obtaining the tungsten oxide/graphene aerogel after freeze drying; according to the method, uniformly dispersed tungsten oxide nanowires and graphene aerogel with a hierarchical pore structure are combined to form an electrocatalyst composite substrate with the hierarchical pore structure, the electrocatalyst composite substrate serving as a carrier can further improve the stability of the catalyst, low-content platinum is loaded finally, the reaction process is simple, reaction steps are few, the reaction period is short and repeatability is good; the prepared tungsten oxide/graphene aerogel-based low-platinum composite material is high in unit mass activity in an electro-catalytic reaction, has high catalytic stability and fast mass transfer characteristics, and can be widely applied to electro-catalysis, electrochemical sensing or water pollutant treatment materials.

Description

technical field [0001] The invention relates to the technical field of material chemistry, more specifically, to a low-platinum composite material based on tungsten oxide / graphene airgel and its preparation method and application. Background technique [0002] With the development of society, people's demand for energy is increasing, and energy mainly comes from the consumption of fossil fuels. However, fossil fuel is a non-renewable resource with limited reserves, and its use will have a certain impact on the environment. Therefore, it is urgent to find a clean energy that can replace fossil fuels. Among various clean energy sources, hydrogen has attracted extensive attention due to its high energy density and non-polluting characteristics of combustion products. Producing hydrogen from electricity generated by wind, solar or water conservancy is one way to efficiently store energy without producing carbon dioxide and toxic gases. In recent years, with the continuous upgr...

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Problems solved by technology

For example, Chinese patent CN111111658A discloses a single-atom Pt-supported tungsten oxide single-layer nanosheet catalyst with ultra-high catalytic activity, in which single-atom Pt is uniformly dispersed on the tungsten oxide single-layer nanosheet to form a single-layer nanosheet as an electrocatalytic hydrogen evolution catalyst. However, the single tungsten oxide carrier-supported Pt catalyst has a short board of low conductivity, which limits its application.

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