Photochemical electron storage on colloidal metals and hydrogen formation by free radicals

Henglein, A.; Lindig, Barbara A.; Westerhausen, J.

doi:10.1021/j150612a005

Cited by 58 publications

(44 citation statements)

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“…As shown in Figure S3, the photocatalytic activity of the pure CD-005 composite film was very low, but it was greatly improved by loading with Pt nanocrystals. (Hengleln et al 1981). Schematic picture describing the photocatalytic reaction of the cellulose composite film containing CdS nanoparticles under sunlight and its time course of hydrogen yield over Pt-loaded composite film CD-03 are shown in Fig.…”

Section: Effect Of Cellulose Matrix On Propertiesmentioning

confidence: 99%

Construction of inorganic nanoparticles by micro-nano-porous structure of cellulose matrix

Liu

Zeng

et al. 2011

Cellulose

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In our previous work, the CdS nanoparticles/cellulose films exhibited significantly high photocatalytic H 2 production efficiency under visible light irradiation than the ordinary CdS photocatalyst. In present paper, the CdS nanoparticles were synthesized in situ in pores of the regenerated cellulose substrate and the porous structure of cellulose, formation of the CdS nanoparticles and interactions between CdS and cellulose matrix in the composite films were investigated deeply. The experimental results indicated that the micro-nano-porous structure of the cellulose matrix could be used easily to create inorganic nanoparticles, which supplied not only cavities for the formation of nanoparticles, but also a shell (semistiff cellulose molecules support the pore wall) to protect their nano-structure. When the cellulose films with porous structure at wet state were immersed into inorganic ions solution, the ions interacted immediately with the -OH groups of cellulose, and then transformed into inorganic composite via another treatment, finally inorganic nanoparticles formed during the dry. The pore size of the cellulose matrix decreased from 180 nm (at wet state) to about 18 nm (at dry state), leading to the formation of nanoparticles. The results revealed that the CdS nanoparticles with a mean particle diameter about 6 nm were dispersed well, and were immobilized tightly in the cellulose matrix, resulting in a portable photocatalyst with high efficiency for photocatalytic for H 2 evolution. This is simple and ''green'' pathway to prepare the organicinorganic hybrid materials.

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Section: Effect Of Cellulose Matrix On Propertiesmentioning

confidence: 99%

Construction of inorganic nanoparticles by micro-nano-porous structure of cellulose matrix

Liu

Zeng

et al. 2011

Cellulose

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“…Metal nanoparticles (NPs) have been used as catalysts for multielectron redox reactions using radicals generated by light or by ionizing radiation (e.g., M = silver,, , , gold,, , etc.). The mechanism of water‐reduction catalysis by the one‐electron reducing radical, · (CH 3 ) 2 OH, has been proposed by Henglein , , .…”

Section: Introductionmentioning

confidence: 99%

“…[32][33][34][35][36] Good heterogeneous catalysts, consisting of L n Re VII =O deposited on Pd 0 -NPs, where the Pd 0 -NPs catalyze the reduction of the L n Re VII =O, have been developed. [33,37] Metal nanoparticles (NPs) have been used as catalysts for multielectron redox reactions using radicals generated by light [44] or by ionizing radiation [45][46][47][48][49][50][51][52][53][54][55] (e.g., M = silver, [48,51,53,54] gold, [50,52,55] etc.). The mechanism of water-reduction catalysis by the one-electron reducing radical, ·(CH 3 ) 2 OH, has been proposed by Henglein.…”

Section: Introductionmentioning

confidence: 99%

Pd⁰‐ and Au⁰‐Nanoparticles Catalyze the Reduction of Perchlorate by ·C(CH₃)₂OH Radicals

Benjamini

Bar‐Ziv²,

Zidki

et al. 2017

Eur J Inorg Chem

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Catalytic water reduction to hydrogen takes place when metal nanoparticles (M0‐NPs) of gold or palladium are charged with an excess of electrons by an electron‐transfer process from strong reducing α‐alcohol radicals such as ·C(CH3)2OH. The results reported in this study indicate that the M0‐NPs also catalyze the reduction of perchlorate by ·C(CH3)2OH radicals and by BH4–. The results point out that the M0‐NPs behave as nanoelectrodes. The catalytic reduction of perchlorate competes well with the catalytic reduction of water; that is, although the concentration of perchlorate is orders of magnitude smaller than that of water, the radicals reduce the perchlorate preferentially. Thus, we have identified a new way to deal with the residual perchlorate in water, using any reducing agent forming adsorbed hydrogen. The nature of the reactive reducing agent (M0‐NPs)n–/{(M0‐NPs) – Hm}(n–m)– [n = number of excess electrons and m = number of electrons given off after the same number of H atoms have been adsorbed] and the energetic processes, which might be different for the two M0‐NPs, are discussed. The results demonstrate that M0‐NPs can be developed as simple and effective catalysts for the removal of perchlorate from polluted aqueous solutions.

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“…22,28 Examples of redox electrocatalysis date back to the pioneering works of the groups of Henglein, Miesel, Grätzel, Bard and others in late 1970s. Their works involved generating organic and inorganic free-radicals in de-aerated aqueous solutions to charge and discharge colloidal metallic NPs predominantly of Pt, [29][30][31][32][33] Ag 28,[34][35][36] and Au. [37][38][39] Free-radicals may be generated radiolytically via exposure of a mixture of 2-propanol and acetone to γ-irradiation from a 60 Co source 34 or with UV-light.…”

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confidence: 99%

Redox Electrocatalysis of Floating Nanoparticles: Determining Electrocatalytic Properties without the Influence of Solid Supports

Peljo

Scanlon

Olaya

et al. 2017

J. Phys. Chem. Lett.

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Redox electrocatalysis (catalysis of electron-transfer reactions by floating conductive particles) is discussed from the point-of-view of Fermi level equilibration, and an overall theoretical framework is given. Examples of redox electrocatalysis in solution, in bipolar configuration, and at liquid-liquid interfaces are provided, highlighting that bipolar and liquid-liquid interfacial systems allow the study of the electrocatalytic properties of particles without effects from the support, but only liquid-liquid interfaces allow measurement of the electrocatalytic current directly. Additionally, photoinduced redox electrocatalysis will be of interest, for example, to achieve water splitting.

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Photochemical electron storage on colloidal metals and hydrogen formation by free radicals

Cited by 58 publications

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Construction of inorganic nanoparticles by micro-nano-porous structure of cellulose matrix

Construction of inorganic nanoparticles by micro-nano-porous structure of cellulose matrix

Pd⁰‐ and Au⁰‐Nanoparticles Catalyze the Reduction of Perchlorate by ·C(CH₃)₂OH Radicals

Redox Electrocatalysis of Floating Nanoparticles: Determining Electrocatalytic Properties without the Influence of Solid Supports

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Photochemical electron storage on colloidal metals and hydrogen formation by free radicals

Cited by 58 publications

References 0 publications

Construction of inorganic nanoparticles by micro-nano-porous structure of cellulose matrix

Construction of inorganic nanoparticles by micro-nano-porous structure of cellulose matrix

Pd0‐ and Au0‐Nanoparticles Catalyze the Reduction of Perchlorate by ·C(CH3)2OH Radicals

Redox Electrocatalysis of Floating Nanoparticles: Determining Electrocatalytic Properties without the Influence of Solid Supports

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Pd⁰‐ and Au⁰‐Nanoparticles Catalyze the Reduction of Perchlorate by ·C(CH₃)₂OH Radicals