China University of Science and Technology Progresses in Research on Electrocatalytic Hydrogen Evolution
RuCo@NC nanoparticle synthesis route and structural model schematic. (a) Co3[Co(CN)6]2, (b) Ag-Co-doped Co3[Co(CN)6]2, (c) aggregates of RuCo@NC nanoparticles, (d) one RuCo in c @ NC nanoparticle amplification model diagram, and briefly describes the hydrogen evolution process as an electrocatalyst in alkaline medium.
Hydrogen is considered to be an environmentally friendly clean energy. Electrocatalytic decomposition of water can produce high-purity hydrogen. Electrolysis of water in alkaline media is the most likely technology for industrial hydrogen production. For a long time precious metals have been the most active catalysts in this field. In recent years, researchers have continued to explore the development of transition metals into highly active alkaline hydrogen evolution electrocatalysts to reduce costs. However, the activity of many catalysts is still far behind that of precious metals. . The alloying of a small amount of noble metal with transition metals is an important way to improve the electrocatalytic properties of transition metals. Recently, Dr. Su Jianwei and Yang Yang (Tutor Chen Ganwang), Ph.D. students from the University of Science and Technology of China, calculated the idea of ​​alloying a small amount of noble metal antimony with transition metal cobalt to enhance cobalt catalytic activity, and designed a metal organic framework compound. A process for preparing a nitrogen-doped graphene-like layer encapsulating an alloy core composite structure for a precursor. The prepared composite nanostructure acts as an alkaline hydrogen evolution electrocatalyst and exhibits comparable hydrogen evolution performance as the noble metal. The research was published in the recently published Nature Communications.
In this work, noble metal antimony-doped Cobalt cobalt cyanide Prussian blue was used as a precursor to calcine in an inert gas atmosphere to prepare a nitrogen-doped graphene-like layer coated cobalt-niobium alloy nanoparticle. The alloy contains 3.58 wt. .%. This method can in-situ coat the nitrogen-doped graphene layer on the surface of the alloy and protect the alloy core to improve stability. As an alkaline hydrogen evolution electrocatalyst, its overpotential at the current density of 10 mA/cm2 was only 28 mV, showing an electrocatalytic hydrogen evolution performance comparable to 20% commercial platinum carbon electrocatalyst. Density functional theory simulation calculations found that the adjacent carbon atom of the nitrogen atom is the active site of the catalytic reaction. Cobalt and antimony alloying can promote the transfer of electrons to the surface of the graphene-like layer and change the ratio of the internal cobalt-bismuth alloy. The charge distribution on the surface of the external graphene layer can be controlled. The appropriate proportion of cobalt-bismuth alloy can greatly reduce the hydrogen adsorption free energy of the active site and can reach a hydrogen adsorption free energy similar to the platinum catalyst. This unique composite nanostructure enables its catalytic performance to be greatly improved and has potential application prospects.
The study was supported by the National Natural Science Foundation of China, the Chinese Academy of Sciences and the school's Youth Innovation Fund and Other related projects.
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