Polyoxometalates as Hydrogen Evolution Catalysts

  • ChemPubSoc Europe Logo
  • Author: ChemPlusChem
  • Published Date: 24 June 2015
  • Source / Publisher: ChemPlusChem/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
thumbnail image: Polyoxometalates as Hydrogen Evolution Catalysts

Related Societies

Artificial photosynthesis is a strategy for converting light energy into storable chemical fuels in a single process. In one approach, water is split directly into oxygen and hydrogen, the latter of which is highly efficient for energy storage and conversion. Overall water-splitting processes may be based on separate water oxidation and reduction catalysts, which are often polyoxometalates (POMs). This large family of metal clusters displays manifold structural modifications and diverse chemical reactivity.


To better understand POM-based water reduction catalysts, Greta Patzke, University of Zurich, Switzerland, and colleagues have probed the structure-activity relationships of these multifaceted materials. Nickel-substituted Keggin-type POMs [Ni(H2O)XW11O39]n- (X = P, Ge, Si) were investigated as water reduction catalysts with [Ru(bpy)3]2+ as a photosensitizer.


The heteroatom X was found to exert a strong influence on the catalytic activity, and the Ge-containing POM displayed the best performance. However, X does not affect the energy level of the lowest unoccupied molecular orbital (LUMO), and the photochemical steps differ considerably from the electrochemical pathways. This finding is different from previously described structure-activity relationships of POM catalysts and is an unexpected turn on the path to optimized cluster catalysts for photochemical water reduction.



Greta Patzke has been featured in ChemPlusChem’s Early Career Series.

 

Article Views: 3495

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH