Figure 3: Electrochemical properties of PtNi/Ni–B. | Nature Communications

Figure 3: Electrochemical properties of PtNi/Ni–B.

From: Amorphous nickel boride membrane on a platinum–nickel alloy surface for enhanced oxygen reduction reaction

Figure 3

(a) Cyclic voltammetry curves of PtNi/Ni–B/C, PtNi/C and Pt/C catalyst in N2-saturated 0.1 M HClO4 solution with a sweep rate of 50 mV s−1. (b) ORR polarization curves. (c) The corresponding Tafel plots for PtNi/Ni–B/C, PtNi/C and Pt/C in O2-saturated 0.1 M HClO4 solution with a sweep rate of 10 mV s−1 and a rotation rate of 1,600 r.p.m. The currents were normalized to the geometric area of the rotating disk electrode (0.196 cm2). (d) Mass activity for these three catalysts at 0.9 and 0.95 V versus RHE. For the PtNi/C or PtNi/Ni–B/C catalyst, the Pt loading on a RDE was 1.2 μg, whereas the Pt loading was 2.4 μg for the Pt/C catalyst. (e) Comparison of specific activity at 0.9 and 0.95 V based on the ECSAs calculated from the charges associated with Hupd. (f) ORR polarization curves of PtNi/Ni–B/C before and after 5,000 cycles between 0.6 and 1.0 V.

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