Breakthrough in Bifunctional Electrocatalysts Could Address Energy Crisis

Researchers from Xi'an Polytechnic University have made significant progress in developing stable and economical bifunctional electrocatalysts that can facilitate both hydrogen and oxygen evolution reactions in the same medium. This innovation could hold the key to addressing the energy crisis. The team, led by Hongjuan Hao, has designed a LaCoO3@FeOOH catalyst with a core-shell structure to enhance electrocatalytic activity for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).

Key Takeaways:

• The LaCoO3@FeOOH catalyst with a 2:1 ratio exhibited the highest catalytic activity for OER, with an overpotential of only 325 mV.
• LaCoO3@FeOOH with a 3:1 ratio demonstrated the best catalytic performance in HER, yielding overpotentials of 414 mV and 430 mV, respectively.
• The optimized composite consists of LaCoO3 particles and an amorphous FeOOH layer.
• The significant enhancement in catalytic activity can be attributed to the high electron transfer rate at the interface between the LaCoO3 and FeOOH layers.
• Strong interaction between the reaction intermediates and the catalyst also contributed to the improved catalytic activity.
• The LaCoO3@FeOOH 2:1 and 3:1 catalyst maintained high stability after continuous operation for 20 h, indicating promising practical application prospects.

Statistics:

• 325 mV: overpotential required for LaCoO3@FeOOH 2:1 ratio to exhibit highest catalytic activity for OER.
• 414 mV and 430 mV: overpotentials required for LaCoO3@FeOOH 3:1 ratio to demonstrate best catalytic performance in HER.
• 20 h: duration of continuous operation for LaCoO3@FeOOH 2:1 and 3:1 catalyst, indicating stability and practical application prospects.

Sources:

• Interface-engineered Lacoo 3 @feooh Core-shell Heterostructures: Synergistic Electron Transfer for Ultra-stable Bifunctional Water Splitting In Alkaline Media. Journal of Alloys and Compounds, 2025;1040.