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. 2019 Jun 27;4(7):1733–1740. doi: 10.1021/acsenergylett.9b00945

Figure 4.

Figure 4

(a) Linear sweep voltammetry (LSV) curves (corrected by uncompensated resistance) of LixMoS2 catalysts on glassy carbon electrode (GCE). (b) Tafel plots (mV/dec) of corresponding catalysts derived from panel a. Solid lines represent experimental data, and dashed lines represent the linear fit. Electrolyte: 0.1 M H2SO4, scan rate: 5 mV/s. (c) Calculated turnover frequency (TOF) as a function of applied potential for LixMoS2/C catalysts. (d) DFT calculated free Gibbs energy of proton adsorption on Li-adsorbed MoS2 Mo edge. (e) 7Li MAS NMR spectrum acquired at 20 kHz for LixMoS2 catalysts in contact with H2O and after HER. (f) Galvanostatic responses (E–t) recorded on MoS2 (black), Li0.29MoS2 (blue), and Li2.06MoS2 (orange) for 24 h at a constant current density of −23 mA/cm2. (g) 7Li MAS NMR spectrum acquired at 20 kHz for Li0.29MoS2 catalyst after HER test for 24 h.