Fig. 3

HER performance of SA Co-D 1T MoS₂. a Polarization curves of different catalysts tested in Ar-saturated 0.5 m H₂SO₄. b Tafel plots for the catalysts derived from a. c HER activity comparison using the Tafel slope (mV dec⁻¹) vs. overpotential at a current density of 10 mA cm⁻². d Polarization curves of the SA Co-D 1T MoS₂ after 10,000 CV cycles. e Time dependence of the current density for SA Co-D 1T MoS₂ at a static overpotential of 100 mV vs. RHE. f HER polarization plots of MoS₂, 1T MoS₂ prepared by lithiation, Co NDs/MoS₂ and SA Co-D 1T MoS₂ without and with SCN⁻ ions. The inset shows that the cobalt HER active centers are blocked by SCN⁻ ions