H2 generation and sulfide to sulfoxide oxidation with H<inf>2</inf>O and sunlight with a model photoelectrosynthesis cell

Pau Farràs, Carlo Di Giovanni, John Noel Clifford, Emilio Palomares, Antoni Llobet

Research output: Contribution to journalReview articleResearchpeer-review

11 Citations (Scopus)

Abstract

© 2014 Elsevier B.V. A summary of the recent advances in homogeneous light-driven catalytic oxidation reactions is provided either using sacrificial agents or with complete functional cells. In this work, a photoelectrosynthesis model cell (PESC) for H2 generation together with methyl phenyl sulfide (MeSPh) oxidation to the corresponding sulfoxide (MeS(O)Ph) with H2O and using sunlight has been prepared and characterized. We have built a two compartment PESC connected through a Nafion proton exchange membrane. The cathode consists of a platinum mesh in a pH 7.0 buffered solution. The photoanode consist on a FTO/TiO2-P-bpy-RuII,2+ (where P-bpy-RuII,2+ is [RuII(P-bpy)(bpy)2]2+ and P-bpy is 2,2'-bipyridine-4,4'-bis(phosphonic acid)) electrode immersed in the same pH 7.0 solution. The anodic compartment also contains the catalyst {[RuII(trpy)(H2O)]2(μ-pyr-dc)}(OAc) (trpy is 2,2':6',2′-terpyridine and pyr-dc3- is the pyrazolato-3,5-dicarboxylato trianion) abbreviated as [H2O-RuIIRuII-OH2]+ (2,2+) in homogenous solution. The illumination under sun simulated 1.5 AMG (100mWcm-2) together with an external input of -0.43V vs. SSCE led to the formation of hydrogen gas and the oxidation of the sulfide to sulfoxide. Last but not least, all the significant reactions involved have been characterized both from a thermodynamic and also from a kinetics viewpoint to analyze the system losses.
Original languageEnglish
Pages (from-to)202-208
JournalCoordination Chemistry Reviews
Volume304-305
DOIs
Publication statusPublished - 1 Dec 2015

Keywords

  • Photoanodes
  • Photochemistry
  • Photoelectrosynthesis
  • Redox catalysis
  • Ruthenium complexes
  • Sulfide oxidation

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