Fig. 4: Synergetic effect of Co/Se-codoping on the HER performance of MoS2 nanofoam.
From: Boosting hydrogen evolution on MoS2 via co-confining selenium in surface and cobalt in inner layer
a HER polarization curves for Co/Se-MoS2-NF with different Co-doping contents in comparison with Co-MoS2-NF and 40% Pt/C. All samples are drop-casted on glassy carbon electrode for measurements. The Tafel plots (b) and the electrochemical impedance spectroscopy (EIS) Nyquist plots (c) of Co/Se-MoS2-NF sample compared with Co-MoS2-NF, Se-MoS2-NF, MoS2-NF, and commercial 40% Pt/C. d HER polarization curves for Co/Se-MoS2-NF under large current densities in comparison with 40% Pt/C and carbon paper. Co/Se-MoS2-NF and 40% Pt/C are drop-casted on carbon paper for measurements. e The chronopotentiometric measurements of long-term stability for Co/Se-MoS2-NF and 40% Pt/C at 1000 mA cm−2. The vertical dotted lines in e mark the time span (every 72 h) of replacing the electrolyte in the 360 h chronoamperometry test. All the HER measurements were conducted in a 0.5 M H2SO4 electrolyte at 25 °C.
