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. 2020 Jul 7;6(8):1431–1440. doi: 10.1021/acscentsci.0c00458

Figure 5.

Figure 5

ORR electrocatalytic performances of various metal atoms anchored on hollow graphene frameworks. (a) LSV curves of N-Gr, Co-N-Gr-H, Co-N-Gr, Fe-N-Gr, Ni-N-Gr, Cu-N-Gr, and commercial Pt/C in O2-saturated 0.1 M KOH at a scan rate of 5 mV·s–1 and 1600 rpm. (b) The corresponding Jk at 0.85 V and E1/2. (c) LSV curves of Fe-N-Gr in O2-saturated 0.1 M KOH at a scan rate of 5 mV·s–1 and different rotation rates. (d) RRDE voltammograms recorded with Fe-N-Gr in O2-saturated 0.1 M KOH at 1600 rpm. (e) Peroxide yields and electron numbers of Fe-N-Gr at various potentials based on RRDE data. (f) Chronoamperometric curves of Fe-N-Gr and Pt/C in O2-saturated 0.1 M KOH at 1600 rpm and 0.7 V versus RHE.