Ruthenium polyoxometalate water splitting catalyst: very fast hole scavenging from photogenerated oxidants

Orlandi, Michele; Argazzi, Roberto; Sartorel, Andrea; Carraro, Mauro; Scorrano, Gianfranco; Bonchio, Marcella; Scandola, Franco

doi:10.1039/b926823e

Cited by 166 publications

(138 citation statements)

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“…[87] There is considerable current research activity aimed at optimizing strategies of incorporating the Ru 4 -POM into efficient devices for water oxidation and other applications. [92][93][94][95] 2À as a sacrificial oxidant the POM showed photocatalytic activity in the visible-light region producing O 2 with a quantum yield of 30 %. [93] Water splitting with an overpotential as low as 0.35 V and TOFs approaching the solution behavior was achieved by immobilization of the Ru 4 -POM catalyst on the surface of a semiconductor anode based on multiwalled carbon nanotubes functionalized by polyamidoamine dendron moieties.…”

Section: Rutheniummentioning

confidence: 99%

Noble Metals in Polyoxometalates

2012

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Polyoxometalates containing noble metal ions, such as ruthenium, osmium, rhodium, palladium, platinum, silver and gold, are a structurally diverse class of compounds. They include both classical heteropolyanions (vanadates, molybdates, tungstates) in which noble metals are present as heteroatoms, as well as the recently discovered class of polyoxometalates with noble metal "addenda" atoms. The focus of this Review is on complexes that should, in principle, exist as discrete molecular species in solution, and which are therefore of interest for their reactivity, their future synthetic utility and potential applications, for example, in catalysis or nanoscience.

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Section: Rutheniummentioning

confidence: 99%

Noble Metals in Polyoxometalates

2012

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“…Pt is a rare metal, and is known to have a low over potential for water splitting, whereas carbon-based materials are less efficient. Due to the efficiency, rarity, and cost of Pt, there is an active area of research focused on finding an alternative, abundant metal/semi-metal with similar properties [21,[23][24][25][26]. Many theoretical and experimental studies have been done to further understand the water-Pt interface [27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Structural characterization of water-metal interfaces

Ryczko

Tamblyn

2017

Phys. Rev. B

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We analyze and compare the structural, dynamical, and electronic properties of liquid water next to prototypical metals including Pt, graphite, and graphene. Our results are built on BornOppenheimer molecular dynamics (BOMD) generated using density functional theory (DFT) which explicitly include van der Waals (vdW) interactions within a first principles approach. All calculations reported use large simulation cells, allowing for an accurate treatment of the water-electrode interfaces. We have included vdW interactions through the use of the optB86b-vdW exchange correlation functional. Comparisons with the Perdew-Burke-Ernzerhof (PBE) exchange correlation functional are also shown. We find an initial peak, due to chemisorption, in the density profile of the liquid water-Pt interface not seen in the liquid water-graphite interface, liquid water-graphene interface, nor interfaces studied previously. To further investigate this chemisorption peak, we also report differences in the electronic structure of single water molecules on both Pt and graphite surfaces. We find that a covalent bond forms between the single water molecule and the Pt surface, but not between the single water molecule and the graphite surface. We also discuss the effects that defects and dopants in the graphite and graphene surfaces have on the structure and dynamics of liquid water.

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“…Moreover, the removal of one or more of the addenda atoms from the POM framework results in the formation of a lacunary species, which can coordinate different metal ions, resulting in the formation of metal-substituted POMs [11,25]. Metal-substituted POMs have been used as catalysts in several catalytic reactions, ranging from the epoxidation of olefins and alkanes to the splitting of water [26][27][28][29]. Additionally, POMs exhibit biological activity, which includes in vitro and in vivo anticancer, antiviral, antibiotic, antiprotozoal and antidiabetic activity [23,24,30].…”

Section: Introductionmentioning

confidence: 99%