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Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties

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Spin-State Tuning in PrFeO_3-δ Perovskite for High-Temperature Oxygen Evolution Reaction.

Jingcheng Yu^1,2, Qingxue Liu^1,2, Shuo Wang¹

¹State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

Journal of the American Chemical Society

|August 27, 2025

Summary

Alkaline earth metal doping in perovskite oxides enhances high-temperature oxygen evolution reaction (OER) performance in solid oxide electrolysis cells (SOECs). Reduced e_g electron occupancy in B-site Fe accelerates charge transfer and oxygen transport for improved anode materials.

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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

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Published on: June 9, 2023

Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Perovskite oxides are crucial for electrocatalytic applications.
Understanding the link between electronic structure and oxygen evolution reaction (OER) in solid oxide electrolysis cells (SOECs) is vital but underexplored.
The role of e_g electron occupancy in high-temperature OER performance needs further investigation.

Purpose of the Study:

To investigate the effect of A-site doping on the OER performance of perovskite oxides.
To explore the relationship between B-site Fe electronic structure and high-temperature OER in SOECs.
To guide the rational design of Fe-based perovskites for SOEC anode applications.

Main Methods:

Synthesis of A-site doped Pr_0.5Ae_0.5FeO_3-δ (Ae = Ca, Sr, Ba) perovskite oxides.
Electrocatalytic testing for high-temperature oxygen evolution reaction (OER) in SOECs.
Characterization using X-ray absorption spectroscopy, ⁵⁷Fe Mössbauer spectroscopy, and magnetic susceptibility measurements.

Main Results:

Pr_0.5Ae_0.5FeO_3-δ perovskites exhibit exceptional high-temperature OER performance.
Pr_0.5Ba_0.5FeO_3-δ achieved a current density of 3.33 A cm^-2 at 2.0 V and 800 °C.
Doping induced a spin-state transition of Fe from high-spin Fe³⁺ to low-spin Fe⁴⁺, reducing e_g occupancy.

Conclusions:

Reduced e_g electron occupancy in B-site Fe is critical for high-temperature OER performance in SOECs.
The spin-state transition of Fe accelerates charge transfer and oxygen transport.
Fe-based perovskites with tailored electronic structures are promising SOEC anode materials.