000202642 001__ 202642
000202642 005__ 20190416055543.0
000202642 0247_ $$2doi$$a10.1039/C4SC02196G
000202642 02470 $$2ISI$$a000349832600019
000202642 037__ $$aARTICLE
000202642 245__ $$aCatalysis of water oxidation in acetonitrile by iridium oxide nanoparticles
000202642 269__ $$a2015
000202642 260__ $$c2015
000202642 336__ $$aJournal Articles
000202642 520__ $$aWater oxidation catalysed by iridium oxide nanoparticles (IrO2 NPs) in water–acetonitrile mixtures using [RuIII(bpy)3]3+ as oxidant was studied as a function of the water content, the acidity of the reaction media and the catalyst concentration. It was observed that under acidic conditions (HClO4) and at high water contents (80% (v/v)) the reaction is slow, but its rate increases as the water content decreases, reaching a maximum at approximately equimolar proportions (≈25% H2O (v/v)). The results can be rationalized based on the structure of water in water–acetonitrile mixtures. At high water fractions, water is present in highly hydrogen-bonded arrangements and is less reactive. As the water content decreases, water clustering gives rise to the formation of water-rich micro-domains, and the number of bonded water molecules decreases monotonically. The results presented herein indicate that non-bonded water present in the water micro-domains is considerably more reactive towards oxygen production. Finally, long term electrolysis of water–acetonitrile mixtures containing [RuII(bpy)3]2+ and IrO2 NPs in solution show that the amount of oxygen produced is constant with time demonstrating that the redox mediator is stable under these experimental conditions.
000202642 700__ $$0246377$$g219571$$aHidalgo-Acosta, Jonnathan C.
000202642 700__ $$0242743$$g182147$$aMéndez, Manuel A.
000202642 700__ $$aScanlon, Micheál D.
000202642 700__ $$0242981$$g188283$$aVrubel, Heron
000202642 700__ $$0245346$$g181373$$aAmstutz, Véronique
000202642 700__ $$aAdamiak, Wojciech
000202642 700__ $$aOpallo, Marcin
000202642 700__ $$aGirault, Hubert H.$$g105258$$0242739
000202642 773__ $$j6$$tChemical Science$$q1761-1769
000202642 8564_ $$uhttps://infoscience.epfl.ch/record/202642/files/c4sc02196g.pdf$$zPublisher's version$$s1546732$$yPublisher's version
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