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Summary

Copper polypyridyl complexes show promise as electrocatalysts for the oxygen reduction reaction (ORR). The CuN(4) complex demonstrated the highest ORR onset potential among the studied copper complexes.

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Area of Science:

Electrochemistry
Materials Science
Catalysis

Background:

The oxygen reduction reaction (ORR) is crucial for energy conversion technologies.
Developing efficient and cost-effective electrocatalysts for ORR is a significant challenge.
Copper polypyridyl complexes offer potential as alternatives to precious metal catalysts.

Purpose of the Study:

To investigate three copper polypyridyl complexes as electrocatalysts for the oxygen reduction reaction (ORR).
To compare the catalytic activity and performance of different copper coordination environments (CuN3, Cu2N6, CuN4).
To identify promising copper-based catalysts for ORR applications.

Main Methods:

Synthesis and characterization of three copper polypyridyl complexes: Cu-N(3) (1), Cu(2)N(6) (2), and CuN(4) (3).
Electrochemical evaluation of the complexes as electrocatalysts for the oxygen reduction reaction (ORR).
Measurement of ORR onset potential and catalytic activity at pH 1.

Main Results:

The CuN(4) complex ([3](ClO(4))(2)) exhibited the highest ORR onset potential (0.53 V vs RHE) among the studied copper complexes.
The Cu(2)N(6) hemocyanin model showed higher activity than the CuN(3) complex.
The CuN(4) complex demonstrated superior activity compared to both CuN(3) and Cu(2)N(6) complexes.

Conclusions:

Copper polypyridyl complexes are effective electrocatalysts for the oxygen reduction reaction (ORR).
The coordination environment around the copper center significantly influences ORR catalytic activity.
The CuN(4) complex represents a highly promising candidate for ORR cathode catalysis.