Metalloporphyrin Catalysts of Oxygen Reduction - Fuel Cell Catalysis: A Surface Science Approach - page 660

Figure 18.15 Summary of reported n av at the plateau of the catalytic wave for cofacial metal-
loporphyrinoids adsorbed on a graphite electrode in contact with an aqueous acid (pH 0 - 1): (a)
data organized by structural type; (b) data organized in order of decreasing selectivity toward the
four-electron pathway. The asterisk identifies catalysts that manifest two catalytic waves
(Fig. 18.10a); n av of the first wave is listed; n av ¼ 4 at the plateau of the second wave. See
Fig. 18.13 for the structures of the complexes. When contradictory values of n av appear in
the literature, the largest reported one is shown. Heterometallic complexes, (DPB)CoX (X ¼
In, Mn, Ti, Al, Ga) were reported to manifest catalytic properties identical to those of the
DPA analogs [Guilard et al., 1995]. The data are from Collman et al. [1994, 2003a], in addition
to Rosenthal and Nocera [2007] for (DPD)Co 2 , (DPDM)Co 2 , (DPX)Co 2 , and (DPXM)Co 2 ;
Kadish et al. [2005] for the corrole-containing complexes; Kobayashi et al. [1990] for the phtha-
locyanines; and Guilard et al. [1995] for the bimetallic DPA and DPB series derivatives.