Co-PPy/C catalyst

The half-cell shown in Fig. 12.1 can also be used for evaluating non-Pt-based catalysts. For example, Lee et al. [2] investigated the ORR kinetics and mechanisms on carbon-supported cobalt polypyrrole (Co-PPy/C) catalysts by using both RDE and RRDE techniques. Figure 12.5 presents the ORR current-voltage (I-V) curves in 0.5 M H2SO4 with several Co-PPy/C catalysts, which shows that the catalyst heat treated at 800 °C can yield the highest catalytic... 

FIG U RE 12.5 Polarization curves of unpyrolyzed and pyrolyzed Co-PPy/C catalysts at 25 °C in 0.5 M H2SO4 under saturated N2 and O2, respectively. Potential scan rate 5 mV s . Electrode rotation rate 400 rpm. Co-PPy/C loading 0.122 mg cm [2]. (For color version of this figure, the reader is referred to the online version of this book.)... 

Fig. 14.23 Koutecky-Levich plots for the ORR of unpyrolyzed and pyrolyzed Ppy-C-Co catalysts at 0.3 V (zs. RHE) in 0.5 M H2S04 under saturated 02 and 0.122 mgcrn-2 Ppy-C-Co loading. The current densities were normalized to the geometric area (Reprinted from [224] with permission from Elsevier).

Fig. 16.22 Stability measurements of (a) a Co-PPy-CB and (b) a Fe/CB-PFM catalysts. Both catalysts were measured under nearly the same conditions at 80°C, backpressures of 2 atm, gases at 100% RH with catalyst loadings of 6 mg/cm and 5.6 mg/cm for the Co-PPy-CB and Fe/CB-PPM catalysts, respectively. The figure in (a) was taken from [177] copyright 2006, reproduced with permission of Nature Publishing Group. The figure in (b) was taken from [165], reprinted with permission from AAAS...

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