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. Author manuscript; available in PMC: 2013 Oct 29.
Published in final edited form as: J Phys Chem C Nanomater Interfaces. 2011 Jul 12;115(32):10.1021/jp2042526. doi: 10.1021/jp2042526

Figure 9. Chemical activity-recovery.

Figure 9

(A) Tafel plots derived from RDE-voltammetry in pH 1 H2SO4-solution for four catalysts: (i) O-catalyst, (ii) AW-catalyst obtained by acid washing the O-catalyst in 0.1 M H2SO4, filtering, rinsing and drying, (iii) a chemically-reactivated catalyst obtained by acid-washing the O-catalyst, filtering, base-washing the filtrate in 0.1 M NaOH, rinsing and drying, and (iv) the AW-catalyst re-heat-treated in Ar at 300°C.

(B) X-ray photo-electron spectra of S2p for the O-catalyst, AW-catalyst and chemically reactivated catalyst