Nanoscale structural oscillations in perovskite oxides induced by oxygen evolution

Binghong Han; Kelsey A. Stoerzinger; Vasiliki Tileli; Andrew D. Gamalski; Eric A. Stach; Yang Shao-Horn

doi:10.1038/nmat4764

Nanoscale structural oscillations in perovskite oxides induced by oxygen evolution

Binghong Han, Kelsey A. Stoerzinger, Vasiliki Tileli, Andrew D. Gamalski, Eric A. Stach, Yang Shao-Horn

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

164 Scopus citations

Abstract

Understanding the interaction between water and oxides is critical for many technological applications, including energy storage, surface wetting/self-cleaning, photocatalysis and sensors. Here, we report observations of strong structural oscillations of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF) in the presence of both H ₂O vapour and electron irradiation using environmental transmission electron microscopy. These oscillations are related to the formation and collapse of gaseous bubbles. Electron energy-loss spectroscopy provides direct evidence of O₂ formation in these bubbles due to the incorporation of H₂O into BSCF. SrCoO_3-δ was found to exhibit small oscillations, while none were observed for La_0.5Sr_0.5CoO_3-δ and LaCoO₃. The structural oscillations of BSCF can be attributed to the fact that its oxygen 2p-band centre is close to the Fermi level, which leads to a low energy penalty for oxygen vacancy formation, high ion mobility, and high water uptake. This work provides surprising insights into the interaction between water and oxides under electron-beam irradiation.

Original language	English (US)
Pages (from-to)	121-126
Number of pages	6
Journal	Nature Materials
Volume	16
Issue number	1
DOIs	https://doi.org/10.1038/nmat4764
State	Published - Jan 1 2017
Externally published	Yes

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title = "Nanoscale structural oscillations in perovskite oxides induced by oxygen evolution",

abstract = "Understanding the interaction between water and oxides is critical for many technological applications, including energy storage, surface wetting/self-cleaning, photocatalysis and sensors. Here, we report observations of strong structural oscillations of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) in the presence of both H 2O vapour and electron irradiation using environmental transmission electron microscopy. These oscillations are related to the formation and collapse of gaseous bubbles. Electron energy-loss spectroscopy provides direct evidence of O2 formation in these bubbles due to the incorporation of H2O into BSCF. SrCoO3-δ was found to exhibit small oscillations, while none were observed for La0.5Sr0.5CoO3-δ and LaCoO3. The structural oscillations of BSCF can be attributed to the fact that its oxygen 2p-band centre is close to the Fermi level, which leads to a low energy penalty for oxygen vacancy formation, high ion mobility, and high water uptake. This work provides surprising insights into the interaction between water and oxides under electron-beam irradiation.",

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AU - Han, Binghong

AU - Stoerzinger, Kelsey A.

AU - Tileli, Vasiliki

AU - Gamalski, Andrew D.

AU - Stach, Eric A.

AU - Shao-Horn, Yang

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Understanding the interaction between water and oxides is critical for many technological applications, including energy storage, surface wetting/self-cleaning, photocatalysis and sensors. Here, we report observations of strong structural oscillations of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) in the presence of both H 2O vapour and electron irradiation using environmental transmission electron microscopy. These oscillations are related to the formation and collapse of gaseous bubbles. Electron energy-loss spectroscopy provides direct evidence of O2 formation in these bubbles due to the incorporation of H2O into BSCF. SrCoO3-δ was found to exhibit small oscillations, while none were observed for La0.5Sr0.5CoO3-δ and LaCoO3. The structural oscillations of BSCF can be attributed to the fact that its oxygen 2p-band centre is close to the Fermi level, which leads to a low energy penalty for oxygen vacancy formation, high ion mobility, and high water uptake. This work provides surprising insights into the interaction between water and oxides under electron-beam irradiation.

AB - Understanding the interaction between water and oxides is critical for many technological applications, including energy storage, surface wetting/self-cleaning, photocatalysis and sensors. Here, we report observations of strong structural oscillations of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) in the presence of both H 2O vapour and electron irradiation using environmental transmission electron microscopy. These oscillations are related to the formation and collapse of gaseous bubbles. Electron energy-loss spectroscopy provides direct evidence of O2 formation in these bubbles due to the incorporation of H2O into BSCF. SrCoO3-δ was found to exhibit small oscillations, while none were observed for La0.5Sr0.5CoO3-δ and LaCoO3. The structural oscillations of BSCF can be attributed to the fact that its oxygen 2p-band centre is close to the Fermi level, which leads to a low energy penalty for oxygen vacancy formation, high ion mobility, and high water uptake. This work provides surprising insights into the interaction between water and oxides under electron-beam irradiation.

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Nanoscale structural oscillations in perovskite oxides induced by oxygen evolution

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