fig3

Figure 3. (A and C) Polarization curves and corresponding Tafel plots of commercial Pt/C, RuP₂ JH and bulk RuP₂ in 0.5 M H₂SO₄ solution; (B) Overpotentials at j = 10, 50 and 100 mA cm^-2 for Pt/C, RuP₂ JH and bulk RuP₂, the error bars represent the standard deviations of three samples, with three measurements conducted for each sample; (D) Overpotentials comparison of RuP₂ JH at j = 10 mA cm^-2 with recently reported HER electrocatalysts; (E) Polarization curves were recorded before and after 1000, 2000, 3000 and 4000 CV potential cycles for RuP₂ JH; (F) Chronoamperometric test for RuP₂ JH in 0.5 M sulfuric acid electrolyte at constant potential for 45 h (without iR correction). HER: Hydrogen evolution reaction.