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- W2027236934 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." @default.
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- W2027236934 date "2007-10-01" @default.
- W2027236934 modified "2023-09-23" @default.
- W2027236934 title "Oxygen Reduction Electrode Properties of Pyrochlores Ln<sub>2</sub>Ru<sub>2</sub>O<sub>7-δ</sub>(Ln=Pr, Nd, Sm) in Aqueous Solutions" @default.
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- W2027236934 doi "https://doi.org/10.4028/www.scientific.net/kem.350.167" @default.
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