Co-doping Strategy for Developing Perovskite Oxides as Highly Efficient Electrocatalysts for Oxygen Evolution...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• The oxygen evolution reaction (OER) is crucial for energy conversion technologies.
• Developing efficient and cost-effective OER electrocatalysts remains a significant challenge.
• Perovskite oxides are promising candidates due to their tunable properties.

Purpose of the Study:

• To develop a synergistic co-doping strategy for BaCoO3-δ perovskites.
• To investigate the effect of iron and tin co-doping on OER activity.
• To identify a perovskite composition with enhanced electrocatalytic performance.

Main Methods:

• Synthesis of a series of BaCo(0.9-x)FexSn(0.1)O(3-δ) perovskites.
• Structural characterization using X-ray diffraction.
• Electrochemical evaluation of OER activity and kinetics.

Main Results:

• A stable cubic perovskite structure was achieved by tailoring Fe and Sn doping concentrations.
• The optimized BaCo(0.7)Fe(0.2)Sn(0.1)O(3-δ) exhibited intrinsic OER activity over an order of magnitude higher than IrO2.
• A low Tafel slope of 69 mV dec⁻¹ was recorded, indicating efficient OER kinetics.

Conclusions:

• Synergistic co-doping is an effective strategy to tune the OER performance of perovskites.
• BaCo(0.7)Fe(0.2)Sn(0.1)O(3-δ) represents a highly active and efficient electrocatalyst for the oxygen evolution reaction.
• This work provides a pathway for designing advanced perovskite-based OER catalysts.