Fig. 3: HER performance in 1.0 M KOH. | Nature Communications

Fig. 3: HER performance in 1.0 M KOH.

From: The synergistic effect of Hf-O-Ru bonds and oxygen vacancies in Ru/HfO2 for enhanced hydrogen evolution

Fig. 3

a The polarization curves of HfO2, VO-Ru/HfO2-OP, VO-Ru/HfO2-O, VO-Ru/HfO2-P, and commercial Ru/C (Ru: 5 wt%), Pt/C (Pt: 20 wt%). b Tafel slopes of VO-Ru/HfO2-OP, VO-Ru/HfO2-O, VO-Ru/HfO2-P, Ru/C, and Pt/C. c Mass activities normalized by the noble metal mass. d Capacitive Δj/2 as a function of the scan rate for VO-Ru/HfO2-OP, VO-Ru/HfO2-O, VO-Ru/HfO2-P. e Nyquist plots of HfO2, VO-Ru/HfO2-OP, VO-Ru/HfO2-O, VO-Ru/HfO2-P, and Ru/C. f The polarization curves of Pt/C and VO-Ru/HfO2-OP before and after 5000 CV cycles. g The stability tests for Pt/C and VO-Ru/HfO2-OP at a constant potential of −0.039 V (vs. RHE) for 28 h. The XC-72 was used as conductive support in all measurement of HfO2. h Operando Ru K-edge XANES spectra and i corresponding Fourier-transformed (FT) magnitudes in operando Ru K-edge EXAFS spectra of VO-Ru/HfO2-OP before and after CA testing at −0.039 V (vs. RHE) for 12 h.

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