The function of metals in metal-compounded semiconductor photocatalysts

Nosaka, Yoshio; Norimatsu, Kohji; Miyama, Hajime

doi:10.1016/0009-2614(84)87025-6

Cited by 113 publications

(75 citation statements)

References 10 publications

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“…According to one school of thought, a noble metal serves as electron sink to minimize the recombination of photo-generated charge carriers, leading thereby to improved quantum efficiency [23][24][25]. Another explanation envisages a correlation between the enhanced photocatalytic activity and the work function of the deposited co-catalyst [26]. While discounting such a relationship, Subramanian et al [27], on the other hand, proposed that the deposition of the organic-capped noble metal particles of Au, Pt and Ir on nano-structured TiO 2 film cause a shift in the quasiFermi level of the composite, resulting in the decreased over-voltage of interfacial charge transfer process.…”

Section: Photocatalytic Activitymentioning

confidence: 97%

Structure Sensitivity of Nano-structured CdS/SBA-15 Containing Au and Pt Co-catalysts for the Photocatalytic Splitting of Water

2007

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Photocatalysts containing nanocrystallites of cadmium sulphide dispersed in the channels of mesoporous silicate SBA-15 exhibited enhanced activity for visiblelight mediated splitting of water, as compared to bulk CdS. Whereas the incorporation of 1 wt.% Pt co-catalyst in CdS/ SBA-15 led to a substantial increase in H 2 yield, Au at similar loading resulted in marginally decreased activity.The results indicate that the photocatalytic activity of CdS crystallites is structure sensitive. Similarly, the role of a noble metal may be associated with the particle size dependent micro-structural features, rather than its electronic properties such as the work function or the heat of adsorption of reactant or product molecules.Keywords Nano-structured cadmium sulphide Á Photocatalysis Á Structure sensitivity Á Splitting of water Á Role of noble metal co-catalyst

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Section: Photocatalytic Activitymentioning

confidence: 97%

Structure Sensitivity of Nano-structured CdS/SBA-15 Containing Au and Pt Co-catalysts for the Photocatalytic Splitting of Water

2007

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“…For example, it has been reported that the deposition of noble metals on semiconductor nanoparticles is an essential factor for maximizing the efficiency of photocatalytic water splitting reactions [21][22][23][24]. In this paper, we report an electrochemical anodic technique for fabricating high-ratio-aspect TiO 2 nanotube arrays based on HMT inhibitor.…”

Section: Introductionmentioning

confidence: 97%

Efficient synthesis of titania nanotubes and enhanced photoresponse of Pt decorated TiO2 for water splitting

Yin

Tan

Hou

et al. 2009

Front. Chem. Eng. China

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We investigated the effect of HMT (hexamethylenetetraamine) on the anodic growth of TiO 2 nanotube arrays. The tube length increases to 4.3 μm with HMT concentration increasing to 0.04 mol$L -1 . Adsorption of HMT on the TiO 2 surface is shown to markedly decrease the chemical dissolution rate of tube mouth, resulting in longer nanotube length. Furthermore, Pt nanoparticles were successfully deposited on the surface of TiO 2 nanotubes by ac electrodeposition method. The TiO 2 /Pt composites were characterized by field emission scanning electron microscope (FESEM), X-ray photoelectron spectra (XPS), and photoelectrochemistry. An enhancement in photocurrent density has been achieved upon modification of TiO 2 nanotubes with Pt nanoparticles.

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“…While noble metal nanoparticles, e.g. platinum nanoparticles, distributed at the surface of TiO 2 photocatalysts can enhance the photocatalytic activity [15,[22][23][24][25][26][27][28][29], organic residues can alter or cancel this activity [2,30]. While metal platinum nanoparticles are the objects of tremendous interest for electrode applications in proton exchange membrane fuel cells (PEMFC) [2,[31][32][33][34][35], the oxidation of organic residues present at the surface of these nanoparticles, yielding the formation of adsorbed carbon monoxide, can dramatically reduce the efficiency of such electrodes [2,30].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and functionalities of noble metal nanoparticles formed through simple all-inorganic photochemical procedures

Riassetto¹,

Roussel²,

Rapenne³

et al. 2010

Journal of Experimental Nanoscience

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The photochemical reduction of metal precursors under UV light has been studied to produce noble metal nanoparticles. Depending on the metal (Pt, Au or Ag) and precursor (chlorinated or nitrate) natures, different 1-step or 2-step photolytic or photocatalytic reduction mechanisms have been investigated. These mechanisms yield simple all-inorganic methods to generate metal nanoparticles in liquid medium and disperse these particles at the surface of various kinds of supports. Depending on the metal particle and support natures, different functionalities can arise from such easy and low-cost photometallisation methods.

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The function of metals in metal-compounded semiconductor photocatalysts

Cited by 113 publications

References 10 publications

Structure Sensitivity of Nano-structured CdS/SBA-15 Containing Au and Pt Co-catalysts for the Photocatalytic Splitting of Water

Structure Sensitivity of Nano-structured CdS/SBA-15 Containing Au and Pt Co-catalysts for the Photocatalytic Splitting of Water

Efficient synthesis of titania nanotubes and enhanced photoresponse of Pt decorated TiO2 for water splitting

Synthesis and functionalities of noble metal nanoparticles formed through simple all-inorganic photochemical procedures

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