Ordered mesoporous CeO2-TiO2 composites: Highly efficient photocatalysts for the reduction of CO2 with H2O under simulated solar irradiation

Wang, Yangang; Li, Bo; Zhang, Chengli; Cui, Lifeng; Kang, Shifei; Li, Xi; Zhou, Lihui

doi:10.1016/j.apcatb.2012.11.019

Cited by 243 publications

(113 citation statements)

References 47 publications

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“…For mesoporous graphitic C 3 N 4 , it was revealed that the photoactivity for CO 2 reduction to formic acid was strongly dependent on its specific surface area and crystallinity rather than the pore size and the volume [300]. Similarly, the enhancements of photocatalytic performance for CO 2 reduction over mesoporous composites (CeO 2 -TiO 2 [217] and TiO 2 /ZnO [41]) were also observed in a different group. However, the direct syn-thesis of highly crystalline mesoporous transition-metal oxides that are thermally stable and well-ordered remains a major challenge [301].…”

Section: Developing Mesoporous Photocatalystsmentioning

confidence: 80%

“…Among them, TiO 2 -based semiconductor composites have been extensively studied. The ordered mesoporous CeO 2 -TiO 2 composites exhibited excellent photocatalytic activity in the reduction of CO 2 with H 2 O to CH 4 and CO under simulated solar irradiation, which were about ten and three times higher than that of commercial P25, respectively, due to the enhanced separation of photogenerated electrons and holes [217]. TiO 2 /ZnO composites showed much higher performance in the photoreduction of CO 2 into CH 4 , which was about six times higher than that of commercial P25.…”

Section: Semiconductor Heterojunctionsmentioning

confidence: 98%

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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: Developing Mesoporous Photocatalystsmentioning

confidence: 80%

Section: Semiconductor Heterojunctionsmentioning

confidence: 98%

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

et al. 2014

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“…[71] As a typical material with a laminar structure, g-C 3 N 4 also shows visiblelight activity (460 nm), owing to its relatively narrow bandgap and good charge transfer due to its 2D planar structure with p-conjugated system. As an example, the AgBr/protonated g-C 3 N 4 heterostructure catalyst prepared via a sonication-assisted deposition-precipitation technique showed a 34.1-and 4.2-fold [ 70] Reprinted with permission from reference [70]. Copyright 2013, Elsevier.…”

Section: Particle On 2d Semiconductormentioning

confidence: 99%

“…For instance, the ordered mesoporous CeO 2 /TiO 2 composites showed good photocatalytic activity in the reduction of CO 2 with H 2 O into CH 4 and CO under simulated solar irradiation, which is higher than that of P25 due to the enhanced separation of photogenerated electrons and holes. [70] One more example is the TiO 2 /ZnO composites, which are used to photoreduce CO 2 into CH 4 . [82] Since the finding that photocatalytic water splitting could be realized over the metal-free polymeric g-C 3 N 4 was published in 2009, [83] g-C 3 N 4 has attracted great attention as it is almost ideal for the construction of low-cost photocatalysts such as heterostructured catalysts by coupling with other semiconductors like In 2 O 3 , [84] NaNbO 3 , [67] Ag 3 PO 4 , [85] WO 3 , [53] and ZnO.…”

Section: Non-p-n Semiconductor Heterostructurementioning

confidence: 99%

Photocatalytic Reduction of CO₂ over Heterostructure Semiconductors into Value‐Added Chemicals

Guo

Wang

2016

The Chemical Record

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Photoreduction of CO2 , which utilizes solar energy to convert CO2 into hydrocarbons, can be an effective means to overcome the increasing energy crisis and mitigate the rising emissions of greenhouse gas. This article covers recent advances in the CO2 photoreduction over heterostructure-based photocatalysts. The fundamentals of CO2 photoreduction and classification of the heterostructured photocatalysts are discussed first, followed by the latest work on the CO2 photoreduction over heterostructured photocatalysts in terms of the classification of the coupling semiconductors. Finally, a brief summary and a perspective on the challenges in this area are presented.

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“…In this work, the photocatalyst was coated directly on the reactor surface, which is directly irradiated, thus avoiding light absorption from reaction medium, which usually happens in reported thin film reactors [46,71]. This option allowed us to reduce the amount of catalyst from 400 mg to 10 mg and, most importantly, to expose all the employed catalyst to incident light; in this way, the catalyst is more prone to provide the photocatalytic effect.…”

Section: On the Reactor Designmentioning

confidence: 99%

Sustainable Carbon Dioxide Photoreduction by a Cooperative Effect of Reactor Design and Titania Metal Promotion

et al. 2018

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An effective process based on the photocatalytic reduction of CO 2 to face on the one hand, the crucial problem of environmental pollution, and, on the other hand, to propose an efficient way to product clean and sustainable energy sources has been developed in this work. Particular attention has been paid to the sustainability of the process by using a green reductant (water) and TiO 2 as a photocatalyst under very mild operative conditions (room temperature and atmospheric pressure). It was shown that the efficiency in carbon dioxide photoreduction is strictly related to the process parameters and to the catalyst features. In order to formulate a versatile and high performing catalyst, TiO 2 was modified by oxide or metal species. Copper (in the oxide CuO form) or gold (as nanoparticles) were employed as promoting metal. Both photocatalytic activity and selectivity displayed by CuO-TiO 2 and Au-TiO 2 were compared, and it was found that the nature of the promoter (either Au or CuO) shifts the selectivity of the process towards two strategic products: CH 4 or H 2 . The catalytic results were discussed in depth and correlated with the physicochemical features of the photocatalysts.

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Ordered mesoporous CeO2-TiO2 composites: Highly efficient photocatalysts for the reduction of CO2 with H2O under simulated solar irradiation

Cited by 243 publications

References 47 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

Photocatalytic Reduction of CO₂ over Heterostructure Semiconductors into Value‐Added Chemicals

Sustainable Carbon Dioxide Photoreduction by a Cooperative Effect of Reactor Design and Titania Metal Promotion

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Ordered mesoporous CeO2-TiO2 composites: Highly efficient photocatalysts for the reduction of CO2 with H2O under simulated solar irradiation

Cited by 243 publications

References 47 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

Photocatalytic Reduction of CO2 over Heterostructure Semiconductors into Value‐Added Chemicals

Sustainable Carbon Dioxide Photoreduction by a Cooperative Effect of Reactor Design and Titania Metal Promotion

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Photocatalytic Reduction of CO₂ over Heterostructure Semiconductors into Value‐Added Chemicals