Synergistic Effect of N and                     Ni2+ on Nanotitania in Photocatalytic Reduction of                     CO2

Fan, Jing; Liu, Enzhou; Tian, Li; Hu, Xiaoyun; He, Qi; Sun, Tao

doi:10.1061/(asce)ee.1943-7870.0000311

Cited by 61 publications

(30 citation statements)

References 29 publications

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“…It is well known that TiO 2 doped with copper shows good selectivity for CH 3 OH from the reduction of CO 2 , which will be discussed below [55,[131][132][133]. Besides Cu, other metal-ion doping such as Ce [134], Mn [135], Ru [83,136], Ni [96,137], In [105], Fe [89], Ag [89,132], Au [136,138], Mg [139] and their co-doping with Cu or N have also been reported for photocatalytic reduction of CO 2 and exhibit enhanced photocatalytic activities for the reduction of CO 2 . Generally, a metal cation doping of TiO 2 not only creates oxygen vacancies and new active sites for the reaction, but also introduces localized mid-gap states which contribute to charge separation and the absorption of visible light [39].…”

Section: Impurity Dopingmentioning

confidence: 99%

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: Impurity Dopingmentioning

confidence: 99%

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

et al. 2014

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“…It was found that doping of TiO 2 with nonmetal elements improved the visible light activity, depending on the type and the concentration of nonmetal dopants. Among the various nonmetal dopants, N-doped TiO 2 is widely used in photooxidation of organics (Lin et al, 2005;Chen and Burda, 2008;Gai et al, 2012) and in CO 2 photoreduction as well (Varghese et al, 2009;Fan et al, 2011;Zhang et al, 2011;Li et al, 2012;Zhang et al, 2012). However, the origin of the visible light activity of N-doped TiO 2 has long been debated.…”

Section: Electron Transfer From the Impurity State To Tio 2 Cbmentioning

confidence: 99%

Understanding the Reaction Mechanism of Photocatalytic Reduction of CO2 with H2O on TiO2-Based Photocatalysts: A Review

Liu

2014

Aerosol Air Qual. Res.

308

217

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Recently, there has been an increasing interest in the research of photocatalytic reduction of CO 2 with H 2 O, an innovative way to simultaneously reduce the level of CO 2 emissions and produce renewable and sustainable fuels. Titanium dioxide (TiO 2 ) and modified TiO 2 composites are the most widely used photocatalysts in this application; however, the reaction mechanism of CO 2 photoreduction on TiO 2 photocatalysts is still not very clear, and the reaction intermediates and product selectivity are not well understood. This review aims to summarize the recent advances in the exploration of reaction mechanism of CO 2 photoreduction with H 2 O in correlation with the TiO 2 photocatalyst characteristics. Discussions are provided in the following sections: (1) CO 2 adsorption, activation and dissociation on TiO 2 photocatalyst; (2) mechanism and approaches to enhance charge transfer from photocatalyst to reactants (i.e., CO 2 and H 2 O); and (3) surface intermediates, reaction pathways, and product selectivity. In each section, the effects of material properties are discussed, including TiO 2 crystal phases (e.g., anatase, rutile, brookite, or their mixtures), surface defects (e.g., oxygen vacancy and Ti 3+) and material modifications (e.g., incorporation of noble metal, metal oxide, and/or nonmetal species to TiO 2 ). Finally, perspectives on future research directions and open issues to be addressed in CO 2 photoreduction are outlined in this review paper.

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“…One problem with TiO 2 is that their photosensitivity is limited to the ultraviolet (UV) region with absorption of only about 4-5% of solar energy due to their relatively large band gap, thus resulting in low quantum efficiencies. A lot of effort has therefore focused on doping TiO 2 with various metals and metal oxides in order to extend their absorption into the visible region (Slamet et al, 2005;Wang et al, 2005;Sasirekha et al, 2006;Wu, 2009;Fan et al, 2011;Wang et al, 2011). In spite of these efforts, both recent reviews (Dey, 2007;Kočí et al, 2008) indicate that the photocatalytic reduction of CO 2 is still in its infancy and that many questions still remain to be answered such as (i) how can the photocatalytic efficiency be improved?, (ii) what is the most suitable form of photocatalysts?, and (ii) how can the utilization of solar energy be greatly increased?…”

Section: Photocatalytic Reduction Of Carbon Dioxidementioning

confidence: 99%

Recent Advances in Catalytic/Biocatalytic Conversion of Greenhouse Methane and Carbon Dioxide to Methanol and Other Oxygenates

Adebajo¹,

Frost²

2012

Greenhouse Gases - Capturing, Utilization and Reduction

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Synergistic Effect of N and Ni2+ on Nanotitania in Photocatalytic Reduction of CO2

Cited by 61 publications

References 29 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

Understanding the Reaction Mechanism of Photocatalytic Reduction of CO2 with H2O on TiO2-Based Photocatalysts: A Review

Recent Advances in Catalytic/Biocatalytic Conversion of Greenhouse Methane and Carbon Dioxide to Methanol and Other Oxygenates

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