Copper doping in titanium oxide catalyst film prepared by dc reactive magnetron sputtering

Zhang, Wenjie; Liu, Ying; Zhu, Shenglong; Wang, Fuhui

doi:10.1016/j.cattod.2004.06.009

Cited by 93 publications

(68 citation statements)

References 15 publications

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“…The Cu 2p peaks were observed at 934, 943, 955, and 962 eV in only the samples containing 10 mol% Cu (not shown) due to its detection limit. These peaks were assigned to the Cu 2+ species [27].…”

Section: Resultsmentioning

confidence: 99%

Preparation of Cu-doped TiO2 via refluxing of alkoxide solution and its photocatalytic properties

et al. 2011

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Cu-doped TiO 2 was prepared by the refluxing of a mixture of copper and titanium alkoxides. The refluxing improved the Cu 2+ dispersion in the TiO 2 and formed effective Ti-O-Cu bonds. The impurity states due to the highly dispersed Cu 2+ were presumed to trap the electrons in the conduction band of the TiO 2 and prevent charge recombination of the electrons and holes. Consequently, the prolonged charge separation duration was suggested to enhance the photocatalytic activity of the Cu-doped TiO 2 . This enhancement was confirmed by the hydroxyl radical generation and organic compound degradation. The Ti-O-Cu bonds and electronic interaction between Cu and Ti should effectively promote the electron trapping.The Cu-doped TiO 2 exhibited a visible light-induced activity due to the transition from the TiO 2 valence band to the Cu 2+ impurity states.

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Section: Resultsmentioning

confidence: 99%

Preparation of Cu-doped TiO2 via refluxing of alkoxide solution and its photocatalytic properties

et al. 2011

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“…Transitional metal ion, rare earth ion or metal oxides have been also extensively used. For example, Bandara et al [18] have reported a CuO incorporated TiO 2 catalyst for photocatalytic hydrogen production from H 2 O. Cu ion or CuO modified TiO 2 photocatalysts [12][13][14][15][16][17][18][19][20][21][22], Cu 2 O modified TiO 2 photocatalysts for hydrogen production has been also reported [23,24]. Electrochemically deposited Cu 2 O on Ti foil followed deposition of n-type TiO 2 resulted in Cu 2 O/ TiO 2 heterojunction thin film [23].…”

Section: Introductionmentioning

confidence: 93%

The Role of Cu(I) Species for Photocatalytic Hydrogen Generation Over CuO x /TiO2

Lü

2009

Catal Lett

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The fabrication of different CuO x species (Cu(0), Cu(I) and Cu(II) species) over TiO 2 has been accomplished and their roles in photoinduced hydrogen generation have been investigated. The results indicate that the positive charge in CuO x center affect photo-induced charge transfer significantly. Cu(I) species seems promote photocurrent generation while the Cu(II) species inhibits the photocurrent generation. Photoactivity order follows the similar sequence. Lower temperature calcination helps the formation of Cu(I) species and higher temperature treatment leads to the formation of Cu(II) species. At the lower loading level, the Cu content increase leads to the activity increase, but over loading of copper resulted in the decrease of activities for hydrogen generation. Detail analysis indicates that too much copper loading induces more Cu(II) center formation, as a results, the activity for hydrogen generation decreases. The species of Cu(0) does no affect the activity obviously at low loading level and shows detrimental effect at high loading level. The optimal loading amount of copper is 1.0Cu (wt%).

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“…First, amorphous or short-range copper oxide phases in TiO 2 that cannot be identified with XRD may cause a reduction in rutile content. Zhang et al (2004) reported that < 65.97 wt.% Cu in TiO 2 had no significant cooper oxide peaks in the XRD powder diffraction patterns. Second, under the high-temperature plasma environment, the injected Cu powder vaporized and subsequently doped into the TiO 2 lattice.…”

Section: Characteristics Of Cu-doped Tio 2 Nanoparticlesmentioning

confidence: 99%

“…Choi et al (1994) reported that metal ion dopants in the TiO 2 crystalline matrix influence photoreactivity, charge carrier recombination rates, and interfacial electron-transfer rates. Other studies doped TiO 2 with metals such as Fe (Oh et al, 2003), Al (Choi et al, 2007), and Cu (Chiang et al, 2002;Zhang et al, 2004;Slamet et al, 2005;Colón et al, 2006;Park et al, 2006;Araña et al, 2008;Xin et al, 2008;Yoong et al, 2009) to improve the reactivity and kinetics of the catalyst. These results support that only select transition metals, including Cu 2+ , can virtually inhibit electron-hole recombination to improve the catalyst (Butler and Davis, 1993;Araña et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Several works have shown that Cu-doped TiO 2 nanoparticles can be fabricated via liquid-phase syntheses (e.g., impregnation and sol-gel) (Chiang et al, 2002;Slamet et al, 2005;Colón et al, 2006;Araña et al, 2008;Xin et al, 2008;Yoong et al, 2009) or vapor-phase syntheses (e.g., sputtering and evaporation condensation) (Zhang et al, 2004;Park et al, 2006). The fabrication process affects the purity and surface properties of the resulting TiO 2 nanoparticles, which subsequently influence the photocatalytic properties.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Cu-Doped TiO2 Photocatalyst with Thermal Plasma Torch for Low-Concentration Mercury Removal

Tsai

Hsi

Kuo

et al. 2013

Aerosol Air Qual. Res.

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A high-quality, Cu-doped TiO 2 photocatalyst was prepared via a single-step process using an atmospheric-pressure plasma torch system. Degussa P-25 was thermally doped with Cu at Cu/(Cu + TiO 2 ) ratios of 0-5 wt.%. The raw and resulting nanoparticles were characterized using TEM, XRD, UV-Vis, and XPS. TEM showed that the particle size of plasma-treated TiO 2 was generally < 50 nm. 67-75% of the resulting particles, by number were between 10 and 20 nm. The remaining particles were < 10 nm (~10%) and between 20 and 30 nm (~10%). The XRD results showed that Cu doping decreased the anatase/rutile crystalline ratio compared to untreated P-25. Nevertheless, the greater the amount of Cu added, the greater the anatase/rutile ratio was for the Cu-doped TiO 2 . The UV-Vis results showed that the absorption wavelength for plasma-treated TiO 2 extended to the visible light range, especially for TiO 2 doped with 5 wt.% Cu.

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Copper doping in titanium oxide catalyst film prepared by dc reactive magnetron sputtering

Cited by 93 publications

References 15 publications

Preparation of Cu-doped TiO2 via refluxing of alkoxide solution and its photocatalytic properties

Preparation of Cu-doped TiO2 via refluxing of alkoxide solution and its photocatalytic properties

The Role of Cu(I) Species for Photocatalytic Hydrogen Generation Over CuO x /TiO2

Preparation of Cu-Doped TiO2 Photocatalyst with Thermal Plasma Torch for Low-Concentration Mercury Removal

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