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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...

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Facile surface defect engineering on perovskite oxides for enhanced OER performance.

Shu-Fang Li1,2, Jie Zheng1, Liang Hu1

  • 1Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, P. R. China. lishufang@mail.ahnu.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|March 10, 2023
PubMed
Summary

Researchers improved perovskite oxide catalysts for the oxygen evolution reaction (OER) by etching Sr2CoFeO6 in nitric acid. The optimized SCFO-24 catalyst shows enhanced OER performance due to increased surface area and oxidative oxygen species.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Perovskite oxides are promising electrocatalysts for the oxygen evolution reaction (OER).
  • Developing efficient and stable OER electrocatalysts is crucial for energy conversion technologies.
  • Tuning perovskite oxide properties can enhance their catalytic activity.

Purpose of the Study:

  • To synthesize and evaluate modified perovskite oxide catalysts for OER.
  • To investigate the effect of acid etching on the structure and performance of Sr2CoFeO6.
  • To understand the mechanisms behind the enhanced OER activity.

Main Methods:

  • Synthesis of Sr2CoFeO6 perovskite oxide.
  • Etching of Sr2CoFeO6 in diluted nitric acid for varying durations.
  • Electrochemical characterization of catalysts for OER, including overpotential and Tafel slope measurements.
  • Analysis of surface area and oxidative oxygen species ratio.

Main Results:

  • A series of perovskite catalysts were successfully prepared via acid etching.
  • The Sr2CoFeO6 sample etched for 24 hours (SCFO-24) demonstrated superior OER activity.
  • SCFO-24 achieved an overpotential of 300 mV at 10 mA cm-2 with a Tafel slope of 59.62 mV dec-1.
  • Enhanced activity is linked to increased specific surface area and a higher ratio of oxidative oxygen species.

Conclusions:

  • Selective dissolution of Sr in nitric acid effectively modifies the perovskite structure.
  • The optimized SCFO-24 catalyst exhibits significantly improved OER performance.
  • This simple acid etching method offers a viable strategy for enhancing the OER activity of perovskite oxides.