IrCo@NC catalyst structure and electrocatalytic hydrogen evolution reaction
Recently, a researcher at the Strong Magnetic Field Science Center of the Chinese Academy of Sciences’ Hefei Institute of Material Science has been employed by two researchers. He Ganwei, a professor at the National Research Center for Physical Sciences at the Microscale of the University of Science and Technology of China, and Professor at the School of Chemistry and Materials Science, Chen Ganwang, used noble metal-doped metal-organic framework materials as Precursor, one-step calcined to prepare a nitrogen-doped graphene-like layer encapsulated samarium-cobalt alloy core-shell structure materials, showing high activity and high stability in the hydrogen evolution reaction of acidic electrolyte.
In recent years, hydrogen production from electrolyzed water has attracted widespread attention in academia. Finding inexpensive and efficient non-platinum electrocatalysts has become a hot topic of study. Graphene, as a 'star material', has the advantages of good conductivity, corrosion resistance, etc., and researchers are committed to developing it. It is a high activity acidic hydrogen evolution electrocatalyst. However, many carbon-based catalysts have a large difference in activity compared with precious metals. How to develop graphene carbon-based materials into high-activity electrocatalysts is a hot topic.
The samarium-cobalt alloy can transfer electrons to the surface active sites. The nitrogen-doped graphene layer coated on the surface of Samarium Cobalt alloy is similar to that of 'Niobium', which helps to prevent the alloy core from being corroded by acid. As an acidic hydrogen evolution electrocatalyst (the content of niobium therein Only 1.56wt.%), its Tafel slope is only 23mV/dec, and its overpotential is only 24mV at a current density of 10mA/cm2, showing comparable electrocatalytic hydrogen evolution to commercial 20% Pt/C electrocatalysts. Performance. Density functional theory simulation calculations found that the adjacent carbon atoms of nitrogen-doped atoms are the active sites of the electrocatalytic reaction. The introduction of ruthenium promotes the migration of electrons to the surface of the graphene-like layer and reduces the hydrogen adsorption of the active sites. Energy. The surface structure characterization of the material and the imaging analysis of the elemental composition revealed that the increase in the amount of nitrogen doping and the enrichment of niobium at the inner surface of the alloy contribute to the improvement of the catalyst performance. The study sought to find cheaper and more efficient electricity. Catalytic hydrogen evolution catalyst provides new ideas.
Relevant research results were published in "Advanced Materials", and doctoral students Jiang Peng, Chen Jitang, and Wang Changlai were the first authors of the dissertation. This research was funded by the National Natural Science Foundation of China, the Chinese Academy of Sciences, and the China University of Science and Technology Youth Innovation Fund.
