Highly Efficient Electrocatalytic Nitrate Reduction to Ammonia: Group VIII-Based Catalysts

Area of Science:

• Environmental Science
• Electrochemistry
• Materials Science

Background:

• Nitrate accumulation in the environment poses significant health and ecological risks.
• Electrochemical nitrate reduction (e-NO3RR) offers a sustainable pathway to convert nitrate into valuable ammonia using renewable energy.
• Developing efficient catalysts is crucial for the success of e-NO3RR.

Purpose of the Study:

• To review Group VIII-based catalysts for e-NO3RR.
• To discuss strategies for enhancing catalyst activity.
• To summarize ammonia recovery processes and future research directions.

Main Methods:

• Comprehensive literature review of Group VIII catalysts (monatomic, bimetallic, oxides, phosphides, composites).
• Analysis of strategies for intrinsic activity enhancement: coordination environment modulation, synergistic effects, defect engineering, and hybridization.
• Summary of ammonia recovery techniques.

Main Results:

• Group VIII catalysts exhibit high activity, low cost, and excellent electron transfer for e-NO3RR.
• Various material modifications and engineering strategies can significantly boost catalytic performance.
• Effective ammonia recovery methods are essential for practical applications.

Conclusions:

• Group VIII catalysts are highly promising for efficient e-NO3RR.
• Catalyst design and process optimization are key to large-scale industrial wastewater treatment.
• Further research is needed to fully realize the potential of e-NO3RR for environmental remediation and ammonia synthesis.