Effects of the Substitution of B-Site Ion on Oxygen Reduction Electrode Properties of Pb2Ru2O7-delta in Aqueous Solutions

The activities of the pyrochlores Pb2Ru2-xMxO7-delta (M=Mn,Fe,Co,Ni)[PRM(0x)] toward electrochemical oxygen reduction (EOR) were examined in 0.1 M KOH and 0.05 M H2SO4 aqueous solutions. The onset voltage (Vo) and the efficiency (E4) of 4-electron reduction of oxygen for PRM(0x) were evaluated by se...

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Veröffentlicht in:Key engineering materials 2007-01, Vol.350, p.171-174
Hauptverfasser: Yoshihara, Kenji, Saito, Yoshinobu, Saito, Morihiro, Kuwano, Jun, Shiroishi, Hidenobu
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Sprache:eng
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Zusammenfassung:The activities of the pyrochlores Pb2Ru2-xMxO7-delta (M=Mn,Fe,Co,Ni)[PRM(0x)] toward electrochemical oxygen reduction (EOR) were examined in 0.1 M KOH and 0.05 M H2SO4 aqueous solutions. The onset voltage (Vo) and the efficiency (E4) of 4-electron reduction of oxygen for PRM(0x) were evaluated by semi-steady state voltammetry with rotating ring-disk electrodes. In PRM01, the order of the EOR activities was PRMn01 > PRCo01 > PRNi01 > PRFe01 in both solutions. This was consistent with the variation of the lattice parameters, i.e. PRM01 with a smaller lattice parameter showed higher EOR activity. In addition, PRMn05 showed higher EOR activity than PRMn01. The onset voltages Vo were 0.95 and 0.50 V vs. reversible hydrogen electrode in 0.1 M KOH and 0.05 M H2SO4, respectively, while E4 was almost 100 % in both solutions. These results indicate that the EOR activity of PRM(0x) depends on the incorporated metal ions on the B-sites and their contents.
ISSN:1013-9826
DOI:10.4028/0-87849-449-9.171