Solar reduction of water. I. Competition between light-induced hydrogen formation and hydrogenation of methylviologen in the system water-Tris(2,2'-bipyridine)ruthenium dication-ethylenediaminetetraacetic acid-platinum

Johansen, Ø.; Launikonis, A.; Loder, JW; Mau, Albert W. H.; Sasse, W. H. F.; Swift, JD; Wells, D.

doi:10.1071/ch9810981

Cited by 66 publications

(13 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whereas the H 2 evolution activity increases by increasing the [Ru(bpyMV2) 3 ] 14+ concentration (Figure S14 in the Supporting Information), an opposite trend is observed when the amount of colloidal Pt is increased, likely due to the enhancement of the hydrogenation of the MV 2+ moieties (Figure ). Certainly, similar behaviors were also observed for the two‐component [Ru(bpy) 3 ] 2+ /MV 2+ systems . Although such a two‐component system is deactivated after approximately two hours of irradiation, the [Ru(bpyMV2) 3 ] 14+ system maintains its activity even after 24 h of photoirradiation (Figure S12 in the Supporting Information).…”

Section: Resultssupporting

confidence: 66%

Photocatalytic H₂ Evolution Using a Ru Chromophore Tethered to Six Viologen Acceptors

Yamamoto

Call

Sakai

2018

Chemistry A European J

View full text Add to dashboard Cite

A new photo-charge separator (PCS) consisting of a [Ru(bpy) ] (bpy=2,2'-bipyridine) chromophore and six viologen (MV ) acceptors, [Ru(bpyMV2) ] , is synthesized and its application in the photocatalytic H evolution reaction is reported. The present PCS possesses shorter linkers for connecting the Ru chromophore and the MV acceptors in comparison with our previous PCSs (Inorg. Chem. Front., 2016, 3, 671-680) and shows a consecutive photo-driven electron transfer in the presence of a sacrificial electron donor [ethylenediaminetetraacetic acid (EDTA)], leading to a multi-electron storage over the PCS. This behavior can also be coupled with the catalytic H evolution by the presence of a colloidal Pt catalyst. More importantly, the present PCS exhibits a much higher durability during the photolysis, which is attributed to the higher rate in the catalytic process. The high durability is also attributed to its bulky framework preventing undesirable side reactions.

show abstract

Section: Resultssupporting

confidence: 66%

Photocatalytic H₂ Evolution Using a Ru Chromophore Tethered to Six Viologen Acceptors

Yamamoto

Call

Sakai

2018

Chemistry A European J

View full text Add to dashboard Cite

show abstract

“…The most extensively used of these mediators was methyl viologen (MV 2+ , dimethyl-4,4′-bipyridinium, usually as its chloride salt). These mediators were subsequently found to undergo deactivation in their role by hydrogenation (23,24). The sacrificial electron donors used in these studies depended on system pH and were generally based on compounds having tertiary amine functionality for decomposition following oxidation, such as triethylamine (TEA), triethanolamine (TEOA), and ethylenediamine-N,N, N′,N′-tetraacetic acid (EDTA) (17,(19)(20)(21)(22).…”

mentioning

confidence: 99%

Photogeneration of hydrogen from water using CdSe nanocrystals demonstrating the importance of surface exchange

Das

Han

Haghighi

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

130

139

View full text Add to dashboard Cite

Unique tripodal S-donor capping agents with an attached carboxylate are found to bind tightly to the surface of CdSe nanocrystals (NCs), making the latter water soluble. Unlike that in similarly solubilized CdSe NCs with one-sulfur or two-sulfur capping agents, dissociation from the NC surface is greatly reduced. The impact of this behavior is seen in the photochemical generation of H 2 in which the CdSe NCs function as the light absorber with metal complexes in aqueous solution as the H 2 -forming catalyst and ascorbic acid as the electron donor source. This precious-metalfree system for H 2 generation from water using [Co(bdt) 2 ]− (bdt, benzene-1,2-dithiolate) as the catalyst exhibits excellent activity with a quantum yield for H 2 formation of 24% at 520 nm light and durability with >300,000 turnovers relative to catalyst in 60 h.photochemistry | solar energy | catalysis | water splitting | quantum dots A rtificial photosynthesis (AP) represents an important strategy for energy conversion from sunlight to storage in chemical bonds (1-4). Unlike natural photosynthesis in which CO 2 + H 2 O are converted into carbohydrates and O 2 , the key energy-storing reaction in AP is the splitting of water into its constituent elements of hydrogen and oxygen (5-16). As a redox reaction, water splitting can be divided into two half-reactions, of which the light-driven generation of H 2 is the reductive component. Many systems for the photogeneration of H 2 have been described over the years and they typically consist of a light absorber, a catalyst for H 2 formation, and sources of protons and electrons. For systems that function in aqueous media, the protons are provided by water, whereas for nonaqueous systems, the protons are provided by weak, generally organic acids. The source of electrons in these photochemical systems is generally a sacrificial electron donor-that is, a compound that decomposes following one electron oxidation.Reports of the light-driven generation of hydrogen date back more than 30 y, beginning with a multicomponent system containing [Ru(bpy) 3 ] 2+ (where bpy is 2,2′-bipyridine) as the chromophore or photosensitizer (PS) and colloidal Pt as the catalyst for making H 2 from protons and electrons (17). In these and many subsequent systems, electron mediators were used to accept an electron from the excited chromophore, PS*-thereby serving as an oxidative quencher-and transfer it to the catalyst. Whereas two of the initial mediators were bpy complexes of rhodium and cobalt (17, 18), the overwhelming majority of electron mediators in these systems were dialkylated 2,2′-and 4,4′-bipyridines and their derivatives (19)(20)(21)(22). The most extensively used of these mediators was methyl viologen (MV 2+ , dimethyl-4,4′-bipyridinium, usually as its chloride salt). These mediators were subsequently found to undergo deactivation in their role by hydrogenation (23, 24). The sacrificial electron donors used in these studies depended on system pH and were generally based on compounds having tertiary amine func...

show abstract

“…However, a serious disadvantage of Pt and MV 2 § containing systems is the destruction of methylviologen during the hydrogen evolution process; Pt also catalyzes the irreversible hydrogenation of methylviologen [7,9,14,16]. Colloidal RuO2, often used -in hydrated form -to catalyze oxygen generation from water [17][18][19][20], can also be used for the water reduction reaction [6,10,11,15].…”

Section: Gl 328mentioning

confidence: 99%

“…For Pt systems, a pronounced maximum is found in the hydrogen production rate and yield as a function of the amount of Pt catalyst present [7,9,16,39]. This maximum is the result of the progressive competition between the Pt-catalyzed hydrogenation of MV 2+ and the hydrogen evolution process [7,9,14,16,40].…”

Section: Photochemical Hydrogen Productionmentioning

confidence: 99%

See 1 more Smart Citation

Colloid-chemical properties of ruthenium dioxide in relation to catalysis of the photochemical generation of hydrogen

Kleijn

Lyklema

1987

Colloid & Polymer Sci

View full text Add to dashboard Cite

A colloid of RuO2, prepared by thermal decomposition of RuCI3, was characterized with respect to its colloid-chemicalproperties and assessed as a catalyst for photochemical production of hydrogen. The RuO2 proved to be unstable towards coagulation, even under conditions of low electrolyte concentration and in the presence of polymers. The sol manifested the same electric double layer characteristics as many other oxide dispersions. The point of zero charge (p.z.c.) in indifferent electrolyte was positioned at pH 5.75.Adsorption of methylviologen (MV2+), a commonly used electron relay in photochemical systems, at the RuO2/solution interface is mainly a result of attractive coulombic interactions (above the p.z.c, of RuO2)~ No indications have been found that it adsorbs on RuO 2 under the operational conditions of hydrogen production. In the hydrogen production system, the mass transfer of methylviologen radicals (MV § is a rate-limiting factor. As a function of the methylviologen concentration, the catalytic production of hydrogen passes through a maximum.

show abstract

Solar reduction of water. I. Competition between light-induced hydrogen formation and hydrogenation of methylviologen in the system water-Tris(2,2'-bipyridine)ruthenium dication-ethylenediaminetetraacetic acid-platinum

Cited by 66 publications

References 0 publications

Photocatalytic H₂ Evolution Using a Ru Chromophore Tethered to Six Viologen Acceptors

Photocatalytic H₂ Evolution Using a Ru Chromophore Tethered to Six Viologen Acceptors

Photogeneration of hydrogen from water using CdSe nanocrystals demonstrating the importance of surface exchange

Colloid-chemical properties of ruthenium dioxide in relation to catalysis of the photochemical generation of hydrogen

Contact Info

Product

Resources

About

Solar reduction of water. I. Competition between light-induced hydrogen formation and hydrogenation of methylviologen in the system water-Tris(2,2'-bipyridine)ruthenium dication-ethylenediaminetetraacetic acid-platinum

Cited by 66 publications

References 0 publications

Photocatalytic H2 Evolution Using a Ru Chromophore Tethered to Six Viologen Acceptors

Photocatalytic H2 Evolution Using a Ru Chromophore Tethered to Six Viologen Acceptors

Photogeneration of hydrogen from water using CdSe nanocrystals demonstrating the importance of surface exchange

Colloid-chemical properties of ruthenium dioxide in relation to catalysis of the photochemical generation of hydrogen

Contact Info

Product

Resources

About

Photocatalytic H₂ Evolution Using a Ru Chromophore Tethered to Six Viologen Acceptors

Photocatalytic H₂ Evolution Using a Ru Chromophore Tethered to Six Viologen Acceptors