%0 Journal Article
%A Cui, Chunhua
%A Heggen, Marc
%A Zabka, Wolf-Dietrich
%A Cui, Wei
%A Osterwalder, Jürg
%A Probst, Benjamin
%A Alberto, Roger
%T Atomically dispersed hybrid nickel-iridium sites for photoelectrocatalysis
%J Nature Communications
%V 8
%N 1
%@ 2041-1723
%C London
%I Nature Publishing Group
%M FZJ-2018-00786
%P 1341
%D 2017
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:29116238
%U <Go to ISI:>//WOS:000414534700005
%R 10.1038/s41467-017-01545-w
%U https://juser.fz-juelich.de/record/842567