Hydrogen evolution catalyzed by a cobalt complex containing an asymmetric Schiff-base ligand

Area of Science:

• Inorganic Chemistry
• Catalysis
• Electrochemistry

Background:

• Proton reduction is a key reaction for sustainable energy technologies.
• Development of efficient and robust catalysts is crucial for hydrogen production.
• Cobalt complexes are promising candidates for catalytic proton reduction.

Purpose of the Study:

• To synthesize and characterize a novel cobalt(iii) complex with an asymmetric Schiff-base ligand.
• To investigate the catalytic activity of the complex for proton reduction.
• To explore the effect of water on the catalytic performance.

Main Methods:

• Synthesis of cobalt(iii) complex with an asymmetric Schiff-base ligand.
• Electrochemical studies including cyclic voltammetry to determine catalytic potential and overpotential.
• Catalytic activity measurements to determine turnover frequency.

Main Results:

• The cobalt(iii) complex demonstrated activity for proton reduction at -1.2 V vs. Fc(+)/Fc (0.56 V vs. NHE).
• An overpotential of 350 mV was observed.
• A high turnover frequency of 420 s(-1) was achieved.
• Catalytic activity was enhanced upon the addition of water.

Conclusions:

• The studied cobalt(iii) complex is an effective electrocatalyst for proton reduction.
• The asymmetric Schiff-base ligand plays a role in the catalytic activity.
• Water can act as a promoter for the catalytic process, suggesting potential for improved catalyst design.