TY  - JOUR
AU  - Cui, Chunhua
AU  - Heggen, Marc
AU  - Zabka, Wolf-Dietrich
AU  - Cui, Wei
AU  - Osterwalder, Jürg
AU  - Probst, Benjamin
AU  - Alberto, Roger
TI  - Atomically dispersed hybrid nickel-iridium sites for photoelectrocatalysis
JO  - Nature Communications
VL  - 8
IS  - 1
SN  - 2041-1723
CY  - London
PB  - Nature Publishing Group
M1  - FZJ-2018-00786
SP  - 1341
PY  - 2017
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:29116238
UR  - <Go to ISI:>//WOS:000414534700005
DO  - DOI:10.1038/s41467-017-01545-w
UR  - https://juser.fz-juelich.de/record/842567
ER  -