Abstract:

In view of the current problem of low number of active sites and poor conductivity of materials when MoS₂ is used as a hydrogen evolution catalyst, MoS₂/PVP composite catalyst was prepared by liquid-phase ultrasonic stripping method and centrifugal treatment in this study. PVP increased the concentration of MoS2 in the dispersion and increased the amount of catalytic active sites. 2H phase to 1T phase transition occurred during the process, which enhanced the catalytic activity. The PI substrate containing the conductive copper layer was selected as the electrode substrate, which improved the transmission efficiency of electrons between the catalyst and the electrode. The MoS₂/PVP composite catalyst was immobilized on the surface of the PI-based electrode by inkjet printing technology to prepare a catalytic hydrogen evolution electrode with an overpotential of 77 mV at 10 mA·cm ^-2 and a Tafel slope of 65 mV·dec ^-1. The above results indicated that the MoS₂/PVP catalytic electrode had excellent catalytic activity.

Key words: MoS₂, HER, inkjet printing, liquid exfoliation, 3D microstructure, PVP