Journal
ACS CATALYSIS
Volume 5, Issue 6, Pages 3422-3429Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b00132
Keywords
water oxidation catalysis; electrocatalysis; water splitting Ru complexes; modified graphite electrodes; heterogeneous water oxidation catalysis; RuO2
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Funding
- MINECO [CTQ-2013-49075-R, SEV-2013-0319, CTQ2011-26440]
- La Caixa foundation
- Deutsche Forschungsgemeinschaft [Ha3265/6-1]
- German Bundesministerium fur Bildung und Forschung within the Rontgen-Angstrom Cluster [05K14KE1]
- Computational Materials and Chemical Sciences project at Brookhaven National Laboratory [DE-AC02-98CH10886]
- U.S. DOE
- Argonne-Northwestern Solar Energy Research (ANSER) Center, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001059]
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Electrochemical reduction of the dizaonium complex, [Ru-II(bda)(NO)(N-N-2)(2)](3+), 2(3+) (N-N-2(2+) is 4-(pyridin-4-yl) benzenediazonium and bda(2-) is [2,2'-bipyridine]-6,6'-dicarboxylate), in acetone produces the covalent grafting of this molecular complex onto glassy carbon (GC) electrodes. Multiple cycling voltammetric experiments on the GC electrode generates hybrid materials labeled as GC-4, with the corresponding Ru-aqua complex anchored on the graphite surface. GC-4 has been characterized at pH = 7.0 by electrochemical techniques and X-ray absorption spectroscopy (XAS) and has been shown to act as an active catalyst for the oxidation of water to dioxygen. This new hybrid material has a lower catalytic performance than its counterpart in homogeneous phase and progressively decomposes to form RuO2 at the electrode surface. Nevertheless the resulting metal oxide attached at the GC electrode surface, GC-RuO2, is a very fast and rugged heterogeneous water oxidation catalyst with TOF(i)s of 300 s(-1) and TONs > 45 000. The observed performance is comparable to the best electrocatalysts reported so far, at neutral pH.
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