Preparation method of graphene-attached plastic supported AuCo sodium borohydride electro-oxidation catalyst

Abstract

The invention provides a preparation method of a graphene-attached plastic supported AuCo sodium borohydride electro-oxidation catalyst. The preparation method of the graphene-attached plastic supported AuCo sodium borohydride electro-oxidation catalyst comprises the following steps: attaching one side of an alkali-resistant double-sided adhesive tape to the surface of plastics; coating the other side of the double-sided adhesive tape with the graphene according to a density of 10-15mg / cm<2>; compacting the graphene with pressure of 4-8MPa; putting the plastics attached with the graphene into an aqueous solution which contains 6g of Co(NO3)2 and 1g of NH4Cl per liter, firstly activating for 3 minutes under a voltage of 1.0V, then electrically depositing Co under a voltage of -1V and maintaining for 0.5-1.0 hour; putting a prepared plastic cobalt matrix attached with the graphene into a solution containing 0.8mmol / mL of AuCl4 for 3-5 minutes. The invention aims at preparing a positive electrode of a fuel cell by using battery structures such as a sodium borohydride fuel cell and taking the graphene-attached plastic supported AuCo as a catalyst. By virtue of the preparation method of the graphene-attached plastic supported AuCo sodium borohydride electro-oxidation catalyst, the problem of poor catalytic activity of the positive electrode of the sodium borohydride fuel cell is solved.

Description

technical field [0001] The invention relates to a preparation method of a sodium borohydride electrooxidation catalyst. Background technique [0002] my country is a big space country and a big ocean country, and the development of space resources and marine resources is directly related to the national strategy of sustainable development. Spacecraft and underwater unmanned submersibles can be used for space and ocean resource exploration, meteorological monitoring, navigation and communication, landform mapping and environmental research, etc., and are the most important carriers for the development of space resources and marine resources. Due to the limitation of the volume of spacecraft and underwater unmanned submersibles, their power sources are required to have a large energy density. At present, most of the power sources are silver-zinc batteries, lead-acid batteries and lithium-ion batteries, etc. However, the energy density of these batteries is limited, resulting ...

AI Technical Summary

Problems solved by technology

Due to the introduction of polymer binders in this traditional way of making electrodes, some catalysts cannot be well contacted with the electrolyte, resulting in disadvantages such as low catalyst utilization and low conductivity.

In addition, since NaBH 4 Direct electro-oxidation operates under alkaline conditions. The metal current collector may react with the alkali to form a metal oxide layer, resulting in a decrease in electrical conductivity. Long-term operation will cause the metal current collector to dissolve or even fall off.

thus affecting the performance of the electrode

NaBH 4 There is also NaBH in direct electrooxidation 4 The problem of low electrooxidation activity, theoretically NaBH 4 The direct electrooxidation can be 8e - Reaction, see (1) formula: