Ginkgo leaf-based porous carbon material loaded with ruthenium and preparation method and application thereof

Abstract

The invention discloses a ginkgo leaf-based porous carbon material loaded with ruthenium. Ginkgo leaves serve as a carbon source, after low-temperature carbonization, a nitrogen-containing compound and alkaline inorganic matter are added, calcination and activation are performed to obtain the ginkgo leaf-based porous carbon material, and then metal ruthenium is loaded onto the porous carbon material through an in-situ reduction method to obtain the ginkgo leaf-based porous carbon material loaded with the ruthenium. A preparation method of the porous carbon material comprises the following steps: (1) the low-temperature carbonization of the ginkgo leaves; (2) the activation and post-treatment of the ginkgo leaf-based porous carbon material; and (3) loading of the metal ruthenium. The ginkgoleaf-based porous carbon material loaded with the ruthenium serves as an ammonia borane hydrolysis hydrogen production catalyst, hydrogen release is completed for 40s at room temperature, the hydrogen release quantity is 92% of a theoretical value, and the hydrogen release rate is up to 3,718 ml s<-1> g<-1>. The ginkgo leaf-based porous carbon material can be recycled, after cycling for five times, the hydrogen release is completed for 60s, the hydrogen release rate is 2,158ml s<-1> g<-1>, and 58% of first-time hydrogen release rate is maintained. By catalyzing ammonia borane at different temperatures for hydrolysis tests, relatively low activation energy Ea=23.86 kJ mol<-1> is shown. The ginkgo leaf-based porous carbon material has a broad application prospect in the fields of manufacturing hydrogen materials, fuel cells and the like.

Description

technical field [0001] The invention relates to the technical field of porous carbon materials and hydrogen production by catalyzing the hydrolysis of ammonia borane, in particular to a preparation method and application of ginkgo leaf-based porous carbon materials loaded with ruthenium. Background technique [0002] With the rapid development of the economy and the continuous growth of the population, people's demand for energy is becoming more and more tense. Although fossil fuels still occupy a large proportion of the energy structure, fossil fuels are non-renewable resources and bring certain pollution to the environment. The resulting energy crisis is becoming more and more prominent. The key technology to solve such problems is the development of new renewable low-carbon green energy and its efficient and clean storage and conversion technology. Hydrogen energy, as a secondary energy source with abundant reserves, high energy density, convenient use, and wide applicat...

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Problems solved by technology

[0005] Liang et al. reduced metal ruthenium to carbon black by in-situ reduction method, but the specific surface area of ​​carbon black is not large, and the surface pores of carbon materials are not many, so the prepared catalyst effect is average.

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