fig4

Figure 4. (A) HER LSV curves of Pt/C, NiCrS and NiCrS/CN under alkaline condition (1.0 M KOH) in three electrode configuration; (B) Comparison of overpotential of Pt/C and NiCrS/CN under different current densities; (C) Tafel plots of NiCrS and NiCrS/CN under alkaline condition (1.0 M KOH); (D) Nyquist diagram of NiCrS and NiCrS/CN under alkaline condition (1.0 M KOH); (E) Chronopotential results of NiCrS and NiCrS/CN under alkaline condition (1.0 M KOH) in three electrode configuration; (F) LSV curves of NiCrS/CN and NiCrS for HER in 1 M KOH and 1 M KOH + Seawater in three electrode configuration; (G) Comprehensive description of NiCrS/CN and NiCrS for HER in 1 M KOH and 1 M KOH + Seawater; (H) Comparison of NiCrS/CN with other transition metal-based catalysts in 1 M KOH + Seawater. HER: Hydrogen evolution reaction; RHE: reversible hydrogen electrode; LSV: linear sweep voltammetry.