Enhancing Bi-functional electrocatalytic activity of perovskite by temperature shock: A case study of LaNiO3-δ

Wei Zhou; Jaka Sunarso

doi:10.1021/jz401169n

Enhancing Bi-functional electrocatalytic activity of perovskite by temperature shock: A case study of LaNiO_3-δ

Wei Zhou, Jaka Sunarso

Research output: Contribution to journal › Article › peer-review

182 Scopus citations

Abstract

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 LaNiO_3-δ. LaNiO_3-δ 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 (ΔE). 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.

Original language	English
Pages (from-to)	2982-2988
Number of pages	7
Journal	Journal of Physical Chemistry Letters
Volume	4
Issue number	17
DOIs	https://doi.org/10.1021/jz401169n
State	Published - 5 Sep 2013
Externally published	Yes

Keywords

electrocatalyst
metal air battery
oxygen evolution
oxygen reduction
perovskite
phase transition

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10.1021/jz401169n

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abstract = "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-δ. LaNiO3-δ 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 (ΔE). 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.",

keywords = "electrocatalyst, metal air battery, oxygen evolution, oxygen reduction, perovskite, phase transition",

author = "Wei Zhou and Jaka Sunarso",

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doi = "10.1021/jz401169n",

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T2 - A case study of LaNiO3-δ

AU - Zhou, Wei

AU - Sunarso, Jaka

PY - 2013/9/5

Y1 - 2013/9/5

N2 - 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-δ. LaNiO3-δ 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 (ΔE). 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.

AB - 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-δ. LaNiO3-δ 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 (ΔE). 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.

KW - electrocatalyst

KW - metal air battery

KW - oxygen evolution

KW - oxygen reduction

KW - perovskite

KW - phase transition

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Enhancing Bi-functional electrocatalytic activity of perovskite by temperature shock: A case study of LaNiO_3-δ

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Keywords

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