Fig. 5
From: Two-dimensional metallic tantalum disulfide as a hydrogen evolution catalyst
Electrocatalytic application of CVD synthesized 2H-TaS2 in HER. a Schematic illustration of the HER process of 2H-TaS2/Au foils. b Hydrogen adsorption energies at S-edge, Ta-edge, and basal-plane of 2H-TaS2, respectively. Yellow, cyan, and grey balls represent S, Ta, and adsorbed H atoms, respectively. c ΔG H* diagram of different H adsorption states. d Polarization curves (iR-corrected) of as-grown 2H-TaS2 with different thicknesses, Au foil, and commercial Pt. e Corresponding Tafel plots of the different samples in d. f Polarization curves (iR-corrected) of 2H-TaS2 (~150 nm thick) before and after 5000 cycles. Inset is the corresponding AFM images. g, h Electrochemical impedance spectra of 2H-TaS2 flakes with different thicknesses, as well as the Au foil substrate. Scale bars, 4 µm in (f, left) and 2 µm in (f, right)
