Atomically dispersed hybrid nickel-iridium sites for photoelectrocatalysis

Chunhua Cui (), Marc Heggen, Wolf-Dietrich Zabka, Wei Cui, Jürg Osterwalder, Benjamin Probst and Roger Alberto
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Chunhua Cui: University of Zürich
Marc Heggen: Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Juelich GmbH
Wolf-Dietrich Zabka: University of Zürich
Wei Cui: University of Zürich
Jürg Osterwalder: University of Zürich
Benjamin Probst: University of Zürich
Roger Alberto: University of Zürich

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Atomically dispersed supported catalysts can maximize atom efficiency and minimize cost. In spite of much progress in gas-phase catalysis, applying such catalysts in the field of renewable energy coupled with electrochemistry remains a challenge due to their limited durability in electrolyte. Here, we report a robust and atomically dispersed hybrid catalyst formed in situ on a hematite semiconductor support during photoelectrochemical oxygen evolution by electrostatic adsorption of soluble monomeric [Ir(OH)6]2− coupled to positively charged NiOx sites. The alkali-stable [Ir(OH)6]2− features synergistically enhanced activity toward water oxidation through NiOx that acts as a “movable bridge” of charge transfer from the hematite surface to the single iridium center. This hybrid catalyst sustains high performance and stability in alkaline electrolyte for >80 h of operation. Our findings provide a promising path for soluble catalysts that are weakly and reversibly bound to semiconductor-supported hole-accumulation inorganic materials under catalytic reaction conditions as hybrid active sites for photoelectrocatalysis.

Date: 2017
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DOI: 10.1038/s41467-017-01545-w

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