Structural changes of cobalt-based perovskites upon water oxidation investigated by EXAFS

Marcel Risch; Alexis Grimaud; Kevin J. May; Kelsey A. Stoerzinger; Tina J. Chen; Azzam N. Mansour; Yang Shao-Horn

doi:10.1021/jp3126768

Structural changes of cobalt-based perovskites upon water oxidation investigated by EXAFS

Marcel Risch, Alexis Grimaud, Kevin J. May, Kelsey A. Stoerzinger, Tina J. Chen, Azzam N. Mansour, Yang Shao-Horn

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Abstract

While many perovskites remain crystalline during the oxygen evolution reaction (OER) in alkaline media, some highly active perovskites become amorphous. We studied the local structure changes of perovskites LaCoO ₃, Ba_0.5Sr_0.5Co_0.8Fe _0.2O_3-δ, and SrCo_0.8Fe _0.2O_3-δ before and after OER by X-ray absorption spectroscopy. No change in either local structure or OER activity was observed for LaCoO₃, while considerably enhanced OER activities and the conversion of the local structure from corner-sharing octahedra to edge-sharing octahedra were noted for Ba_0.5Sr_0.5Co_0.8Fe _0.2O_3-δ and SrCo_0.8Fe_0.2O _3-δ as a result of the OER. Possible processes responsible for the structural change and enhanced OER activities are discussed.

Original language	English (US)
Pages (from-to)	8628-8635
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	117
Issue number	17
DOIs	https://doi.org/10.1021/jp3126768
State	Published - May 2 2013
Externally published	Yes

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title = "Structural changes of cobalt-based perovskites upon water oxidation investigated by EXAFS",

abstract = "While many perovskites remain crystalline during the oxygen evolution reaction (OER) in alkaline media, some highly active perovskites become amorphous. We studied the local structure changes of perovskites LaCoO 3, Ba0.5Sr0.5Co0.8Fe 0.2O3-δ, and SrCo0.8Fe 0.2O3-δ before and after OER by X-ray absorption spectroscopy. No change in either local structure or OER activity was observed for LaCoO3, while considerably enhanced OER activities and the conversion of the local structure from corner-sharing octahedra to edge-sharing octahedra were noted for Ba0.5Sr0.5Co0.8Fe 0.2O3-δ and SrCo0.8Fe0.2O 3-δ as a result of the OER. Possible processes responsible for the structural change and enhanced OER activities are discussed.",

author = "Marcel Risch and Alexis Grimaud and May, {Kevin J.} and Stoerzinger, {Kelsey A.} and Chen, {Tina J.} and Mansour, {Azzam N.} and Yang Shao-Horn",

year = "2013",

month = may,

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doi = "10.1021/jp3126768",

language = "English (US)",

volume = "117",

pages = "8628--8635",

journal = "Journal of Physical Chemistry C",

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TY - JOUR

T1 - Structural changes of cobalt-based perovskites upon water oxidation investigated by EXAFS

AU - Risch, Marcel

AU - Grimaud, Alexis

AU - May, Kevin J.

AU - Stoerzinger, Kelsey A.

AU - Chen, Tina J.

AU - Mansour, Azzam N.

AU - Shao-Horn, Yang

PY - 2013/5/2

Y1 - 2013/5/2

N2 - While many perovskites remain crystalline during the oxygen evolution reaction (OER) in alkaline media, some highly active perovskites become amorphous. We studied the local structure changes of perovskites LaCoO 3, Ba0.5Sr0.5Co0.8Fe 0.2O3-δ, and SrCo0.8Fe 0.2O3-δ before and after OER by X-ray absorption spectroscopy. No change in either local structure or OER activity was observed for LaCoO3, while considerably enhanced OER activities and the conversion of the local structure from corner-sharing octahedra to edge-sharing octahedra were noted for Ba0.5Sr0.5Co0.8Fe 0.2O3-δ and SrCo0.8Fe0.2O 3-δ as a result of the OER. Possible processes responsible for the structural change and enhanced OER activities are discussed.

AB - While many perovskites remain crystalline during the oxygen evolution reaction (OER) in alkaline media, some highly active perovskites become amorphous. We studied the local structure changes of perovskites LaCoO 3, Ba0.5Sr0.5Co0.8Fe 0.2O3-δ, and SrCo0.8Fe 0.2O3-δ before and after OER by X-ray absorption spectroscopy. No change in either local structure or OER activity was observed for LaCoO3, while considerably enhanced OER activities and the conversion of the local structure from corner-sharing octahedra to edge-sharing octahedra were noted for Ba0.5Sr0.5Co0.8Fe 0.2O3-δ and SrCo0.8Fe0.2O 3-δ as a result of the OER. Possible processes responsible for the structural change and enhanced OER activities are discussed.

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U2 - 10.1021/jp3126768

DO - 10.1021/jp3126768

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AN - SCOPUS:84877013198

SN - 1932-7447

VL - 117

SP - 8628

EP - 8635

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 17

ER -

Structural changes of cobalt-based perovskites upon water oxidation investigated by EXAFS

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