Advances in Stabilizing Spinel Cobalt Oxide-Based Catalysts for Acidic Oxygen Evolution Reaction

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• The oxygen evolution reaction (OER) is crucial for energy storage and conversion.
• Acidic OER is limited by sluggish kinetics and expensive noble metal catalysts.
• Spinel cobalt oxide (Co3O4) offers a cost-effective alternative but suffers from poor stability in acidic electrolytes.

Purpose of the Study:

• To review recent advancements in enhancing the stability of spinel Co3O4-based catalysts for acidic OER.
• To analyze fundamental mechanisms of acidic OER and their relation to catalyst stability.
• To summarize key catalyst design strategies and future research directions.

Main Methods:

• Critical examination of recent studies on Co3O4 catalyst stability for acidic OER.
• Analysis of fundamental reaction mechanisms.
• Summarization of five key catalyst design strategies.
• Review of research on structure-activity-stability relationships.

Main Results:

• Five key strategies for enhancing Co3O4 stability are identified: protective surface layers, modulated reaction pathways, controlled cobalt redox dynamics, tuned cobalt-oxygen covalency, and stabilized lattice oxygen.
• Progress in understanding structure-activity-stability relationships, active sites, surface reconstruction, and degradation mechanisms is summarized.
• The review highlights the importance of these strategies for improving catalyst performance.

Conclusions:

• Enhancing the stability of spinel Co3O4 catalysts is critical for their application in acidic OER.
• Further research is needed to address challenges and realize durable, high-performance Co3O4 catalysts.
• Optimized catalyst design strategies are essential for advancing sustainable energy technologies.