Fig. 2
The electrocatalytic HER performance in neutral and alkaline solutions. a, b Linear sweep voltammetry (LSV) curves of Ni3N/Ni/NF, Ni/NF, and optimized Pt/NF (Pt/C: 2.5 mg cm−2) for HER in 1.0 M potassium phosphate (KPi) buffer (a) and 1.0 M KOH (b) with the current density normalized by the geometric electrode area. c LSV curves of Ni3N/Ni/NF and Pt/NF for HER in 1.0 M KOH with the current density normalized by their respective BET surface areas. All LSV curves are iR-corrected. d Chronopotentiometry curves of Ni3N/Ni/NF collected at −10 mA cm−2 normalized by the geometric electrode area in 1.0 M KPi (top) and 1.0 M KOH (bottom) without iR correction
