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Title: Electrochemical Water Oxidation by a Catalyst-Modified Metal-Organic Framework Thin Film

Journal Article · · ChemSusChem
 [1];  [2];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg Virginia 24061 United States
  2. Department of Physics, Purdue University, 525 Northwestern Avenue West Lafayette Indiana 47907 United States
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Water oxidation, a key component in artificial photosynthesis, requires high overpotentials and exhibits slow reaction kinetics that necessitates the use of stable and efficient heterogeneous water-oxidation catalysts (WOCs). Here, we report the synthesis of UiO-67 metal–organic framework (MOF) thin films doped with [Ru(tpy)(dcbpy)OH2]2+ (tpy=2,2':6',2''-terpyridine, dcbpy=5,5'-dicarboxy-2,2'-bipyridine) on conducting surfaces and their propensity for electrochemical water oxidation. The electrocatalyst oxidized water with a turnover frequency (TOF) of (0.2±0.1) s-1 at 1.71 V versus the normal hydrogen electrode (NHE) in buffered solution (pH~7) and exhibited structural and electrochemical stability. The electroactive sites were distributed throughout the MOF thin film on the basis of scan-ratedependent voltammetry studies. This work demonstrates a promising way to immobilize large concentrations of electroactive WOCs into a highly robust MOF scaffold and paves the way for future photoelectrochemical water-splitting systems.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI ID:
1356411
Journal Information:
ChemSusChem, Vol. 10, Issue 3; ISSN 1864-5631
Publisher:
ChemPubSoc Europe
Country of Publication:
United States
Language:
ENGLISH

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