All-in-one visible-light-driven water splitting by combining nanoparticulate and molecular co-catalysts on CdS nanorods

Christian M. Wolff, Peter D. Frischmann, Marcus Schulze, Bernhard J. Bohn, Robin Wein, Panajotis Livadas, Michael T. Carlson, Frank Jäckel, Jochen Feldmann, Frank Würthner () and Jacek K. Stolarczyk ()
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Christian M. Wolff: Ludwig-Maximilians-Universität
Peter D. Frischmann: Universität Würzburg
Marcus Schulze: Universität Würzburg
Bernhard J. Bohn: Ludwig-Maximilians-Universität
Robin Wein: Ludwig-Maximilians-Universität
Panajotis Livadas: Ludwig-Maximilians-Universität
Michael T. Carlson: Ludwig-Maximilians-Universität
Frank Jäckel: Ludwig-Maximilians-Universität
Jochen Feldmann: Ludwig-Maximilians-Universität
Frank Würthner: Universität Würzburg
Jacek K. Stolarczyk: Ludwig-Maximilians-Universität

Nature Energy, 2018, vol. 3, issue 10, 862-869

Abstract: Abstract Full water splitting into hydrogen and oxygen on semiconductor nanocrystals is a challenging task; overpotentials must be overcome for both half-reactions and different catalytic sites are needed to facilitate them. Additionally, efficient charge separation and prevention of back reactions are necessary. Here, we report simultaneous H2 and O2 evolution by CdS nanorods decorated with nanoparticulate reduction and molecular oxidation co-catalysts. The process proceeds entirely without sacrificial agents and relies on the nanorod morphology of CdS to spatially separate the reduction and oxidation sites. Hydrogen is generated on Pt nanoparticles grown at the nanorod tips, while Ru(tpy)(bpy)Cl2-based oxidation catalysts are anchored through dithiocarbamate bonds onto the sides of the nanorod. O2 generation from water was verified by 18O isotope labelling experiments, and time-resolved spectroscopic results confirmed efficient charge separation and ultrafast electron and hole transfer to the reaction sites. The system demonstrates that combining nanoparticulate and molecular catalysts on anisotropic nanocrystals provides an effective pathway for visible-light-driven photocatalytic water splitting.

Date: 2018
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DOI: 10.1038/s41560-018-0229-6

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