Rational Design of Covalent Cobaloxime-COF Hybrids for Enhanced Photocatalytic Hydrogen Evolution.

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ID: 108581
2020
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Abstract
Covalent organic frameworks (COF) display a unique combination of chemical tunability, structural diversity, and porosity. Recent efforts in the field are directed at using such frameworks as tunable scaffolds for chemical reactions. Owing to their built-in photoactivity and nanoscale regularity, COFs have emerged as viable platforms for mimicking natural photosynthesis. While previous approaches have focused on platinum nanoparticle or molecular co-catalysts physisorbed in the COF pores, controlling interfacial charge transfer through close COF-co-catalyst contact remains an open challenge. Here, we present a covalently bound COF-co-catalyst hybrid based on an earth-abundant azide-functionalized cobaloxime hydrogen evolution catalyst immobilized on a hydrazone-linked COF-42 backbone. This single-site heterogeneous catalyst shows improved and prolonged photocatalytic activity with respect to the corresponding physisorbed systems. Advanced solid-state NMR and quantum chemical methods reveal details of the improved photocatalytic activity and the structural composition of the involved active site. We found that a genuine interaction between the COF backbone and the cobaloxime facilitates charge transfer and re-coordination of the co-catalyst during the photoreaction, thereby improving the reactivity and hindering degradation of the catalyst. This study highlights the importance of engineering the COF-co-catalyst interface and at the same time provides pertinent design principles for improved polymeric photocatalysts in general.
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gottschling2020rationaljournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Gottschling, Kerstin;Savasci, Gökcen;Vignolo-González, Hugo A;Schmidt, Sandra;Mauker, Philipp;Banerjee, Tanmay;Rovó, Petra;Ochsenfeld, Christian;Lotsch, Bettina V;
Journal Journal of the American Chemical Society
Year 2020
DOI
10.1021/jacs.0c02155
URL
Keywords
drug delivery polymer-drug conjugate poly(2-oxazoline) polymer therapeutics

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