Fig. 3: Alkaline HER.
a HER polarization curves of Ni foam, NiFe-LDH, Pt/C, Cl-Pt/LDH, and HO-Pt/LDH. b Mass activities of the Pt-based catalysts in this work, and the state-of-the-art SACs reported elsewhere: Pt@DG37, PtSA/NiO/Ni34 and N, Pt-MoS250. c TOFs plots of the Pt-based catalysts. Operando Raman spectrum of (d) Pt/CNF, (e) Cl-Pt/LDH and (f) HO-Pt/LDH. g Micro-polarization curves for Pt/C, Cl-Pt/LDHp and HO-Pt/LDHp. (h) EIS Nyquist plots of the Pt-based catalysts. i Plot of potential vs. time for the Cl-Pt/LDH and commercial Pt/C at a constant cathodic current density of 50 mA cm−2. (inset is chronoamperometry stability tests of Cl-Pt/LDH under the condition with or without the light irradiation.) The Pt loading amount of Cl-Pt/LDH, HO-Pt/LDH, Pt/CNF, Cl-Pt/LDHp, HO-Pt/LDHp, and Pt/C is 1.01 × 10−2, 1.01 × 10−2, 0.4, 2.88 × 10−4, 2.88 × 10−4 and 8.00 × 10−3 mgPt cm−2, respectively.