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Tuning the Electronic Structure of LaNiO3 through Alloying with Strontium to Enhance Oxygen Evolution Activity.

ABSTRACT: The perovskite oxide LaNiO3 is a promising oxygen electrocatalyst for renewable energy storage and conversion technologies. Here, it is shown that strontium substitution for lanthanum in coherently strained, epitaxial LaNiO3 films (La1- x Sr x NiO3) significantly enhances the oxygen evolution reaction (OER) activity, resulting in performance at x = 0.5 comparable to the state-of-the-art catalyst Ba0.5Sr0.5Co0.8Fe0.2O3- ? . By combining X-ray photoemission and X-ray absorption spectroscopies with density functional theory, it is shown that an upward energy shift of the O 2p band relative to the Fermi level occurs with increasing x in La1- x Sr x NiO3. This alloying step strengthens Ni 3d-O 2p hybridization and decreases the charge transfer energy, which in turn accounts for the enhanced OER activity.

SUBMITTER: Liu J 

PROVIDER: S-EPMC6774028 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Tuning the Electronic Structure of LaNiO<sub>3</sub> through Alloying with Strontium to Enhance Oxygen Evolution Activity.

Liu Jishan J   Jia Endong E   Wang Le L   Stoerzinger Kelsey A KA   Zhou Hua H   Tang Chi Sin CS   Yin Xinmao X   He Xu X   Bousquet Eric E   Bowden Mark E ME   Wee Andrew T S ATS   Chambers Scott A SA   Du Yingge Y  

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20190807 19

The perovskite oxide LaNiO<sub>3</sub> is a promising oxygen electrocatalyst for renewable energy storage and conversion technologies. Here, it is shown that strontium substitution for lanthanum in coherently strained, epitaxial LaNiO<sub>3</sub> films (La<sub>1-</sub> <i><sub>x</sub></i> Sr <i><sub>x</sub></i> NiO<sub>3</sub>) significantly enhances the oxygen evolution reaction (OER) activity, resulting in performance at <i>x</i> = 0.5 comparable to the state-of-the-art catalyst Ba<sub>0.5</su  ...[more]

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