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Oxygen Reduction Electrode Properties of Pyrochlores Ln2Ru2O7-δ(Ln=Pr, Nd, Sm) in Aqueous Solutions

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Abstract:

The activity of electrochemical oxygen reduction (EOR) for the pyrochlores Ln2Ru2-XO7-δ (Ln=Pr,Nd,Sm) [LnR] were examined in 0.1 M KOH aqueous solution at 70oC. The onset voltage (Vo) of the oxygen reduction current and the efficiency (E4) of 4-electron reduction of oxygen were evaluated by semi-steady state voltammetry with rotating ring-disk electrodes. PrR with the highest EOR activity showed Vo = ~ 0.85 V vs. reversible hydrogen electrode and E4 values above 80 %. Their Vo and E4 values show that LnR containing Ln with a smaller atomic number has a higher EOR activity, i.e. the order of the activity is PrR > NdR > SmR. This was in good agreement with that of the lattice parameters of LnR. These results indicate that the EOR activity of LnR depends on the kind and/or the size of the lanthanide metal ion on the A-site. PrR and NdR exhibited higher E4 values than known excellent Pb2Ru2O7-δ electrocatalyst containing toxic Pb.

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Periodical:

Key Engineering Materials (Volume 350)

Pages:

167-170

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.350.167

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Online since:

October 2007

Authors:

Yoshinobu Saito, Kenji Yokota, Kenji Yoshihara, Morihiro Saito, Jun Kuwano, Hidenobu Shiroishi

Keywords:

4-Electron Reduction, Alkaline Aqueous Solution, Oxygen Reduction Properties, Pyrochlore

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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