Semisynthetic and Biomolecular Hydrogen Evolution Catalysts

Area of Science:

• Biocatalysis
• Renewable Energy
• Materials Science

Background:

• Developing stable, cost-effective catalysts for hydrogen (H2) production is crucial for transitioning away from fossil fuels.
• Significant advancements have been made in biomolecular catalysts and hybrid systems combining synthetic catalysts with biomolecules.
• Protein engineering offers a promising avenue for creating efficient H2 evolution catalysts.

Purpose of the Study:

• To review progress in engineering proteins for H2 evolution from water.
• To present novel protein-based catalyst designs, including hybrid and modified enzymes.
• To report on a new cobalt-substituted cytochrome c electrocatalyst.

Main Methods:

• Engineering of proteins to incorporate synthetic catalysts.
• Development of hybrid catalysts using photosynthetic proteins and synthetic components.
• Modification of electron-transfer proteins.
• Characterization of a novel cobalt-substituted cytochrome c electrocatalyst.

Main Results:

• Engineered proteins include assemblies of synthetic catalysts with photosynthetic proteins and modified electron-transfer proteins.
• A new thermophilic cobalt-substituted cytochrome c was developed.
• The cobalt cytochrome exhibited nearly quantitative Faradaic efficiency and remarkable longevity.
• The cobalt cytochrome achieved a high turnover number exceeding 270,000.

Conclusions:

• Protein engineering is a powerful strategy for developing advanced H2 evolution catalysts.
• Hybrid and modified protein catalysts show significant potential for efficient and sustainable hydrogen production.
• The cobalt-substituted cytochrome c represents a highly promising electrocatalyst for future energy applications.