{Co4O4} Cubanes in a conducting polymer matrix as bio-inspired molecular oxygen evolution catalysts

Shangkun Li, Zeyi Zhang, Walker R. Marks, Xinan Huang, Hang Chen, Dragos C. Stoian, Rolf Erni, Carlos A. Triana and Greta R. Patzke ()
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Shangkun Li: University of Zurich
Zeyi Zhang: University of Zurich
Walker R. Marks: University of Zurich
Xinan Huang: University of Basel
Hang Chen: University of Zurich
Dragos C. Stoian: Swiss-Norwegian Beamlines - European Synchrotron Radiation Facility
Rolf Erni: Swiss Federal Laboratories for Materials Science and Technology
Carlos A. Triana: University of Zurich
Greta R. Patzke: University of Zurich

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Exploration of efficient molecular water oxidation catalysts for long-term application remains a key challenge for the conversion of renewable energy sources into fuels. Cuboidal {Co4O4} complexes keep attracting interest as molecular water oxidation catalysts as they combine features of both heterogeneous and homogeneous catalysis with bio-inspired motifs. However, the application of many cluster-based catalysts for the oxygen evolution reaction still requires new stabilization strategies. Drawing inspiration from the stabilizing effects of natural polymers, we introduce a conductive polymer-hybrid approach to covalently immobilize {Co4O4} cubane oxo clusters as oxygen evolution catalysts. Polypyrrole is applied as an efficient p-type conducting polymer that promotes hole transfer during the oxygen evolution reaction, resulting in higher turnover frequency compared to the pristine {Co4O4} oxo cluster and heterogeneous Co-oxide benchmarks. The asymmetric coordination of {Co4O4} not only mitigates catalyst decomposition pathways, but also increases the catalytic efficiency by exposing a directed cofacial dihydroxide motif during catalysis.

Date: 2024
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DOI: 10.1038/s41467-024-52514-z

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