NDLI: Electrocatalytic Activity of the Pyrochlores Ln$_{2}$M$_{2}$O$_{7−δ}$ (Ln = Lanthanoids) for Oxygen Reduction Reaction

Content Provider	Springer Nature Link
Author	Konishi, Takayuki Kawai, Hideki Saito, Morihiro Kuwa, Jun Shiroishi, Hidebu Okumura, Toyoki Uchimoto, Yoshiharu
Copyright Year	2009
Abstract	Electrocatalytic oxygen reduction reaction (ORR) activities of the pyrochlore oxides Ln$_{2}$Zr$_{2}$O$_{7−δ}$ (LnZ) and Ln$_{2}$Sn$_{2}$O$_{7−δ}$ (LnS) (Ln = La, Pr, Nd, Sm) were examined in 0.1 M KOH solution at 70 °C. The onset potential (E $_{on}$) of the oxygen reduction current and the efficiency (Eff $_{4}$) of 4-electron reduction of oxygen were evaluated by semi-steady state voltammetry with a rotating ring-disk electrode. In both LnZ and LnS series, the E $_{on}$ values were ~0.85 V versus reversible hydrogen electrode. A relation was found between the E $_{on}$ values and the lattice parameters; i.e. on the whole, the ORR activity became high with an increase in the lattice parameters. When the Ln ion was the same, the LnZ series exhibited higher ORR activities than the LnS series. The pyrochlore LaZ with the highest ORR activity showed a Eff $_{4}$ value higher than 85%. Moreover, Mn-incorporation to LaZ led to a mixed-oxide (1–xLaZ−xLaM) of LaZ and the perovskite LaMnO$_{3}$ (LaM). However, the E $_{on}$ value apparently sifted to a more positive potential probably due to LaMnO$_{3}$, and the magnitude of the cathodic ORR current increased with an increase in the mixing content up to x = 0.3. The mixed-oxide 0.7LaZ–0.3LaM exhibited the highest ORR activity (E $_{on}$ = ~0.90 V and Eff $_{4}$ > 95%), which was comparable to that of a conventional 20 mass% Pt/C catalyst.
Starting Page	896
Ending Page	902
Page Count	7
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	52
Issue Number	6-7
e-ISSN	15729028
Language	English
Publisher	Springer US
Publisher Date	2009-04-17
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electrocatalyst Oxygen reduction reaction Pyrochlore Oxide Alkaline fuel cell Mn-incorporation Characterization and Evaluation of Materials Industrial Chemistry/Chemical Engineering Pharmacy Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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