Cobalt Oxide Materials for Oxygen Evolution Catalysis via Single-Source Precursor Chemistry.

Area of Science:

• Materials Science
• Inorganic Chemistry
• Electrochemistry

Background:

• Metal alkoxides offer precise control over composition and homogeneity for mixed-oxide materials.
• Single-source precursors simplify synthesis of complex oxide catalysts.
• The oxygen evolution reaction (OER) is crucial for energy conversion technologies.

Purpose of the Study:

• To synthesize and characterize a bimetallic cobalt-molybdenum alkoxide as a single-source precursor.
• To evaluate the catalytic performance of derived cobalt oxide catalysts for the OER.
• To investigate the influence of electrolyte cations on OER activity.

Main Methods:

• Anion metathesis reaction for precursor synthesis.
• Characterization of the bimetallic alkoxide precursor.
• Electrochemical testing of derived catalysts for OER in alkaline media.

Main Results:

• Isolation and characterization of the bimetallic Co-Mo alkoxide precursor [Co3Mo4O10(OCH3)10(dmf)4].
• Cobalt oxide catalysts derived from the precursor showed high activity and stability for OER.
• Catalyst performance was significantly affected by the type of metal cation (Li+, Na+, K+, Cs+) in the alkaline electrolyte.

Conclusions:

• The bimetallic Co-Mo alkoxide is a promising single-source precursor for OER catalysts.
• Larger electrolyte cations enhance OER activity, potentially due to hydration enthalpies and improved mass transport.
• The observed trend suggests a universal principle for layered metal oxide catalysts in OER.