Abstract
The synthesis of intermetallic compounds with small size and defective structures is rigorous challenge.In this work,the small size(<10 nm)of intermetallic PdM(M = Pb,Sn,In)with ordered vacancies(OVs)are successfully prepared by ultrafast and solvent-free microwave method for the first time.With the optimized vacancies,atomic arrangement and components,the intermetallic OVs-Pd3Pb-2 shows the best nitrogen reduction(NRR)performance among intermetallic OVs-PdM(M = Sn,In),intermetallic OVs-Pd3Pb with various degrees of vacancies,intermetallic Pd3Pb with vacancies-free,Pd3Pb/CNT and Pd/CNT in Li2SO4 solution.In situ Raman spectroscopy,in situ attenuated total reflectance surface-enhanced infrared absorption spectroscopy(ATR-SEI-RAS)technique and density functional theory(DFT)further demonstrate the synergy mechanism of good NRR activity at low overpotentials on OVs-Pd3Pb-2 catalysts.
NSTL