Fig. 5 SEM images of (a) CoFeP and (b) CoFeP/rGO, (d) TEM image and corresponding elemental mapping images (e~i) of CoFeP/rGO. HER performance of CoFeP and CoFeP/rGO composites in the 0.5 M H2SO4 solution: (j) HER polarization curves; (k) Overpotentials; (l) Tafel plots; (m) Capacitive current densities; (n) Nyquist plots; (o) i-t curves of CoFeP/rGO at potential of 0.076 V vs RHE[67]
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