Effect of silver doping on the TiO2 for photocatalytic reduction of CO2

Kočí, Kamila; Matějů, Kateřina; Obalová, Lucie; Krejčíková, Simona; Lacný, Zdeněk; Plachá, Daniela; Čapek, Libor; Hospodková, A.; Šolcová, Olga

doi:10.1016/j.apcatb.2010.02.030

Cited by 322 publications

(85 citation statements)

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“…Among them, TiO 2 nanosheets with exposed (100), (010), (101) or (001) facets were the most widely investigated photocatalysts in this field [172,[198][199][200][201]. For instance, the anatase TiO 2 ultrathin nanosheets with 95% exposed (100) facets showed a 5 times higher photocatalytic activity for reduction of CO 2 to CH 4 than TiO 2 cuboids with 53% exposed (100) facets [198].…”

Section: Nanostructured Photocatalystsmentioning

confidence: 99%

“…It was even demonstrated that CO 2 − species, generated upon an electron attachment to CO 2 , are spontaneously dissociated into CO on defective Cu(I)/TiO 2−x at room temperature even in the dark [283]. Indrakanti et al [249] performed the excited-state ab initio calculations of CO 2 adsorbed on clusters from the (010), (101), and (001) anatase surface planes. The calculated results indicated that oxygen vacancies may act as the active sites for CO 2 photoreduction, whereas the activation of CO 2 can't be achieved on the stoichiometric TiO 2 surfaces.…”

Section: Important Factors Affecting Co 2 Activationmentioning

confidence: 99%

“…However, most researchers only measured one or two of reduction products in liquid phase and ignored the analysis of products in gas phase, which was not beneficial for a detailed study on the mechanism of CO 2 photoreduction and the selectivity of products. Therefore, in addition to the measurements of products in liquid phase, it is also important to analyze the reduction products in the gas for CO 2 photoreduction in aqueous medium [83,100,101]. Special attention should also be focused on the photocatalytic reduction of CO 2 to C x (x ≥ 2) organic compounds, which is also promising and has received far less attention than analogous systems leading to C 1 products [84,98,99].…”

Section: Mechanism and Kinetics Of Photocatalytic Co 2 Reductionmentioning

confidence: 99%

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Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

et al. 2014

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The shortage of fossil fuels and the disastrous pollution of the environment have led to an increasing interest in artificial photosynthesis. The photocatalytic conversion of CO 2 into solar fuel is believed to be one of the best methods to overcome both the energy crisis and environmental problems. It is of significant importance to efficiently manage the surface reactions and the photo-generated charge carriers to maximize the activity and selectivity of semiconductor photocatalysts for photoconversion of CO 2 and H 2 O to solar fuel. To date, a variety of strategies have been developed to boost their photocatalytic activity and selectivity for CO 2 photoreduction. Based on the analysis of limited factors in improving the photocatalytic efficiency and selectivity, this review attempts to summarize these strategies and their corresponding design principles, including increased visible-light excitation, promoted charge transfer and separation, enhanced adsorption and activation of CO 2 , accelerated CO 2 reduction kinetics and suppressed undesirable reaction. Furthermore, we not only provide a summary of the recent progress in the rational design and fabrication of highly active and selective photocatalysts for the photoreduction of CO 2 , but also offer some fundamental insights into designing highly efficient photocatalysts for water splitting or pollutant degradation. INTRODUCTIONThe shortage of the energy supply and the problem of disastrous environmental pollution have been recognized as two main challenges in the near future [1]. It is a better way to efficiently and inexpensively convert solar energy into chemical fuels by developing an artificial photosynthetic (APS) system because solar fuels are high density energy carriers with long-term storage capacity. The most important and challenging reactions in APS-the photocatalytic water splitting into H 2 and O 2 (water reduction and oxidation) [2][3][4] and photoreduction of CO 2 to solar fuel, such as CH 4 and CH 3 OH [5,6] have been extensively studied since the photocatalytic water splitting on TiO 2 electrodes was discovered by Honda and Fujishima in 1972 [7]. The photocatalytic reduction of CO 2 by means of solar energy has attracted growing attention in the recent years, which 1 State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China 2 College of Science, South China Agricultural University, Guangzhou 510642, China 3 Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia * Corresponding author (email: jiaguoyu@yahoo.com) is also believed to be one of the best methods to overcome both global warming and energy crisis [8]. However, it is also generally thought that photocatalytic CO 2 reduction is a more complex and difficult process than H 2 production due to preferential H 2 production and low selectivity for the carbon species produced [9,10]. The progress achieved in the photoreduction of CO 2 is still far behind that in wate...

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Section: Nanostructured Photocatalystsmentioning

confidence: 99%

Section: Important Factors Affecting Co 2 Activationmentioning

confidence: 99%

Section: Mechanism and Kinetics Of Photocatalytic Co 2 Reductionmentioning

confidence: 99%

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Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

et al. 2014

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“…TiO 2 -based materials are widely applied in sensors [4][5][6][7][8][9] , pollutant degradation 10 , hydrogen generation 11 , bio-applications 12,13 , and photocatalysis [14][15][16][17][18] . Owing to their one-dimensional nature, TiO 2 nanotubes offer a high surface area (1000 m 2 g -1…”

Section: Introductionmentioning

confidence: 99%

Evolution of TiO2 Nanotubular Morphology Obtained in Ethylene Glycol/Glycerol Mixture and its Photoelectrochemical Performance

et al. 2017

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The evolution of TiO 2 nanotubular morphology, synthesized in a mixture of fluorinated ethylene glycol and glycerol electrolyte, was studied as a function of the anodization time. The samples were characterized by FEG-SEM, XRD, XPS, UV-Vis and EIS. The formation of single-or double-walled TiO 2 nanotube structure can be efficiently controlled by the anodization time. For anodization times less than 30 minutes, a compact oxide layer is formed, followed by double-walled nanotube formation up to 120 minutes and single-walled nanotubes up to 240 minutes. XPS analyses show that the samples obtained with short anodization time have a high carbon content and oxygenated surface species compared to the longer-time anodized sample; however, binding energy peaks for Ti 2p remained invariant. The performances of TiO 2 nanotubular photoelectrodes were evaluated in photoelectrochemical water splitting where TiO 2 nanotubes anodized for 120 minutes presented the best performance that was related to their optimal morphology and charge transportation.

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“…In addition, methanol and acetic acid were also observed to be good photocatalysts on molecular sieve combinative system. Kočí et al (2010) also reduced CO 2 but on Ag-doped sol-gel TiO 2 powder. They found that the main factor that influenced the yield of CO 2 during photocatalytic reduction is not the specific surface area but the Ag content.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of CO₂ on C,N–TiO₂ Surfaces

Janus

2012

Adsorption Science & Technology

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Modification of the TiO 2 surface by carbon and nitrogen results in the formation of photocatalysts that have high sorption capacity for CO 2 . The photocatalysts were obtained as follows: approximately 1 g of bare TiO 2 was placed in a furnace and kept for 1 hour at a temperature from 100 to 600 °C. The sample was first placed under argon atmosphere, following which it was placed under an atmosphere of carbon and nitrogen, achieved by passing ammonia via a washer with n-hexane. This treatment is continued for 1 hour, following which the sample was cooled down to room temperature under argon atmosphere. The photocatalysts thus obtained were characterized by Fourier transforminfrared/diffuse reflectance spectroscopy, UV-Vis/diffuse reflectance, X-ray diffraction and Brunauer, Emmett and Teller surface area measurements. In addition, the zeta potential of the surface of photocatalysts was measured. Sorption tests were conducted in a special reactor using the following conditions: temperature: 20 °C, gas flow rate: 100 cm 3 /minute; CO 2 concentration: 1000 ppm. Our results show that the best sorbent was TiO 2 modified at 100 °C for 1 hour. Its sorption capacity amounted to 6.63 mg of CO 2 on 1 g of C,N-TiO 2 photocatalyst.

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Effect of silver doping on the TiO2 for photocatalytic reduction of CO2

Cited by 322 publications

References 38 publications

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

Evolution of TiO2 Nanotubular Morphology Obtained in Ethylene Glycol/Glycerol Mixture and its Photoelectrochemical Performance

Adsorption of CO₂ on C,N–TiO₂ Surfaces

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Effect of silver doping on the TiO2 for photocatalytic reduction of CO2

Cited by 322 publications

References 38 publications

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

Evolution of TiO2 Nanotubular Morphology Obtained in Ethylene Glycol/Glycerol Mixture and its Photoelectrochemical Performance

Adsorption of CO2 on C,N–TiO2 Surfaces

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Adsorption of CO₂ on C,N–TiO₂ Surfaces