Electrochemical water splitting is a promising method for hydrogen production. However, the slow kinetics of the anodic oxygen evolution reaction (OER) limits the overall efficiency of hydrogen production by electrolysis, resulting in a high total energy consumption of the electrolysis process. At the same time, PT-based catalysts have excellent electrocatalytic properties such as excellent electrochemical activity, chemical stability and corrosion resistance, and are considered to be good electrocatalysts for water splitting, but their high and scarce reserves limit their large-scale application. Therefore, the development of bifunctional catalysts with low PT loading for organic-hydroelectric analysis of hydrogen has become an effective strategy to replace traditional water electrolysis, which can not only reduce the energy consumption of hydrogen evolution by reducing the cell voltage, but also obtain high value-added organic chemical products (such as oxidizing CH3OH to HCOOH) at the anode, making the reaction of academic and industrial significance.
Recently,Luo Jingli, Shenzhen UniversitywithZhao BinThe electronic structure of the catalyst was changed by interface engineering, and the double monodisperse PT-Ni3S2 heterogeneous nanocrystals (DMD PT-Ni3S2 HNCs) were synthesized as bifunctional catalysts. Specifically, the researchers used a thermal injection method to compare a secondary monodisperse PT nanocrystal with a size of about 2 nm with a size of about 9The 6 nm primary monodisperse Ni3S2 nanocrystals were heterogeneously combined by chemical action to form "DMD Pt-Ni3S2 HNCs" with abundant lattice defects at the dense heterogeneous interface as a charge transport channel. These heterojunction interfaces can further induce the generation of abundant active sites, thereby improving the catalytic activity of the catalyst, which is of great significance for studying the mechanism of methanol oxidation and hydrogen reactions. The experimental results showed that the synthesized "DMD PT-Ni3S2 HNCs" was in 1It can selectively catalyze the generation of more valuable compounds (HCOoh) by CH3OH at 45 VRHE, with a current density of 100 mA cm-2 and a high Faraday efficiency (Fe>98%).
It is worth noting that due to the fine interfacial electronic modulation and bimonodisperse characteristics, "DMD PT-Ni3S2 HNCs" exhibits excellent bifunctional activity, which is exhibited in 1The HER overpotential required to achieve a current density of 10 mA cm-2 in 0 M KOH solution is only 61 mV. In addition, experimental studies and theoretical analyses show that the presence of PT nanocrystals on the surface of "DMD PT-Ni3S2 HNCs" plays a crucial role in promoting and stabilizing the **Ni site, and further accelerates the conversion of H* and the desorption of H2 during hydrogen evolution, and significantly improves HER activity. In conclusion, the interface between the highly dispersed PT nanocrystals and Ni3S2 nanocrystals provides a strong electronic interaction, which enables the "DMD PT-Ni3S2 HNCs" with synergistic active sites to exhibit excellent performance and selectivity in bifunctional electrocatalytic reactions, and finally realizes the simultaneous formation of formate and hydrogen.
interfacial electronic modulation of dual-monodispersed pt–ni3s2 as efficacious bi-functional electrocatalysts for concurrent h2 evolution and methanol selective oxidation. nano-micro letters, 2024. doi: 10.1007/s40820-023-01282-4