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Enhancing bi-functional electrocatalytic activity of perovskite by temperature shock : a case study of LaNiO3-ᵟ

journal contribution
posted on 2013-01-01, 00:00 authored by W Zhou, Jaka Sunarso
Perovskite oxide offers an attractive alternative to precious metal electrocatalysts given its low cost and high oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activity. The results obtained in this work suggest a correlation of crystal structure with ORR and OER activity for LaNiO3-?. LaNiO3-? perovskites with different crystal structure were obtained by heating at different temperatures, e.g., 400, 600, and 800 C followed by quenching into room temperature. Cubic structure (relative to rhombohedral) leads to higher ORR and OER activity as well as enhanced bi-functional electrocatalytic activity, e.g., lower difference in potential between the ORR at -3 mA cm-2 and OER at 5 mA cm -2 (?E). Therefore, this work shows the possibility to adjust bi-functional activity through a simple process. This correlation may also extend to other perovskite oxide systems.

History

Journal

Journal of physical chemistry letters

Volume

4

Issue

17

Pagination

2982 - 2988

Publisher

American Chemical Society

Location

Washington, D.C.

ISSN

1948-7185

eISSN

1932-7455

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2013, American Chemical Society