Ultrathin TiO2 flakes optimizing solar light driven CO2 reduction

Qamar, Shaista; Lei, Fengcai; Liang, Liang; Gao, Shan; Liu, Katong; Sun, Yongfu; Ni, Wen‐Xiu; Xie, Yi

doi:10.1016/j.nanoen.2016.06.029

Cited by 113 publications

(66 citation statements)

References 22 publications

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“…In particular, this sample reached highest hydrocarbon production at 0.967 mmol g −1 h −1 , which is 1145 times higher than the commercial Aeroxide P25 catalyst. In addition, we also obtained an efficient formation of formic acid at the rate of ≈0.2 mmol g −1 h −1 , ≈200 times higher than a recent result produced by 1.66‐nm‐thick TiO 2 flakes with no nanocavity enhancement (i.e., ≈1.9 μmol g −1 h −1 ). The product selectivity in CTH reactions did not show clear trend with Al 2 O 3 spacer thickness (Figure g), which suggests that the property (or thickness) of TiO 2 thin films in UFPLAs is the dominating factor in influencing product distribution.…”

Section: Resultscontrasting

confidence: 47%

Ultrathin‐Film Titania Photocatalyst on Nanocavity for CO₂ Reduction with Boosted Catalytic Efficiencies

Song

Liang

et al. 2018

Global Challenges

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Photocatalytic CO2 reduction with water to hydrocarbons represents a viable and sustainable process toward greenhouse gas reduction and fuel/chemical production. Development of more efficient catalysts is the key to mitigate the limits in photocatalytic processes. Here, a novel ultrathin‐film photocatalytic light absorber (UFPLA) with TiO2 films to design efficient photocatalytic CO2 conversion processes is created. The UFPLA structure conquers the intrinsic trade‐off between optical absorption and charge carrier extraction efficiency, that is, a solar absorber should be thick enough to absorb majority of the light allowable by its bandgap but thin enough to allow charge carrier extraction for reactions. The as‐obtained structures significantly improve TiO2 photocatalytic activity and selectivity to oxygenated hydrocarbons than the benchmark photocatalyst (Aeroxide P25). Remarkably, UFPLAs with 2‐nm‐thick TiO2 films result in hydrocarbon formation rates of 0.967 mmol g−1 h−1, corresponding to 1145 times higher activity than Aeroxide P25. This observation is confirmed by femtosecond transient absorption spectroscopic experiments where longer charge carrier lifetimes are recorded for the thinner films. The current work demonstrates a powerful strategy to control light absorption and catalysis in CO2 conversion and, therefore, creates new and transformative ways of converting solar energy and greenhouse gas to alcohol fuels/chemicals.

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Section: Resultscontrasting

confidence: 47%

Ultrathin‐Film Titania Photocatalyst on Nanocavity for CO₂ Reduction with Boosted Catalytic Efficiencies

Song

Liang

et al. 2018

Global Challenges

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“…[48] Recent work by Xie and co-workers showed ahigh yield of formate when using 1.66 nm thick TiO 2 flakes. [103] Af ormate formation rate of 1.9 mmol g À1 h À1 was observed, which is 450 times higher than that of bulk TiO 2 and 2times higher than that of Ag-modified BaLa 4 Ti 4 O 15 .H owever,n either 13 Ci sotopic labeling studies nor control experiments using N 2 were reported in this work. Whether or not the formate was produced only from CO 2 reduction remains to be confirmed.…”

Section: Metal Oxides Chalcogenides Bismuth Oxyhalides and Layeredmentioning

confidence: 56%

Catalysis of Carbon Dioxide Photoreduction on Nanosheets: Fundamentals and Challenges

et al. 2018

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The transformation of CO into fuels and chemicals by photocatalysis is a promising strategy to provide a long-term solution to mitigating global warming and energy-supply problems. Achievements in photocatalysis during the last decade have sparked increased interest in using sunlight to reduce CO . Traditional semiconductors used in photocatalysis (e.g. TiO ) are not suitable for use in natural sunlight and their performance is not sufficient even under UV irradiation. Some two-dimensional (2D) materials have recently been designed for the catalytic reduction of CO . These materials still require significant modification, which is a challenge when designing a photocatalytic process. An overarching aim of this Review is to summarize the literature on the photocatalytic conversion of CO by various 2D materials in the liquid phase, with special attention given to the development of novel 2D photocatalyst materials to provide a basis for improved materials.

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“…In this circumstance, to pursue a high‐efficiency photocatalytic system, suitable band alignment and panchromatic absorption behavior of the light harvester appear to be major concerns. Accordingly, a variety of semiconductor materials have been developed as available candidates for photocatalysis, including traditional alternatives such as metal oxides (e.g., TiO 2 , perovskite oxides), metal sulfides, C 3 N 4 , carbons, metal organic frameworks . Morover, our group for the first time has reported that the CsPbBr 3 quantum dot, a representative lead halide perovskite material, was able to conduct the photocatalytic reduction of CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Amorphous‐TiO₂‐Encapsulated CsPbBr₃ Nanocrystal Composite Photocatalyst with Enhanced Charge Separation and CO₂ Fixation

Wang

Liao

et al. 2018

Adv Materials Inter

131

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photocatalysis, including traditional alternatives such as metal oxides (e.g., TiO 2 , perovskite oxides), [3][4][5][6][7][8][9] metal sulfides, [10][11][12] C 3 N 4 , [13,14] carbons, [15,16] metal organic frameworks. [17][18][19][20] Morover, our group for the first time has reported that the CsPbBr 3 quantum dot, a representative lead halide perovskite material, was able to conduct the photocatalytic reduction of CO 2 . [21] By virture of the high extinction coefficient, broad light absorption range, and long electron-hole diffusion length, [22][23][24][25][26] currently the lead halide perovskite materials have gained impressive momentum in photocatalytic researches including HI splitting, [27,28] CO 2 reduction, [21,29,30] and selective oxidation of alcohols. [31] Nevertheless, the overall efficiencies are still far from satisfaction and hanker for rational material designs.As an alluring concept, encapsulation strategy was regarded as a promising technology for high-performance optoelectronic or photochemical applications because of several advantages. For example, the highly contacted geometry of nanocomposite material could promote charge spatial separation by forming heterojunctions for effective charge collection and suppressed charge recombination, [32] contributing to the subsequent surface chemical reactions. Moreover, many cases have shown that the exterior material with high chemical stability can passivate and protect the delicate core component, thereby benefiting the long-term stability. [33][34][35][36][37] Such idea was recently adopted to solve the stability issues of the halide perovskite nanocrystals by embedding them into silica, [38,39] aluminum oxide, [40,41] or polymer [42][43][44][45] matrixes. However, accompanied by the greatly enhanced stability, the electric interaction between the nanocrystals and outer media was also interdicted due to the insulating encapsulation material, which was unsuitable for the photocatalytic applications. Especially, among numerous matrix material candidates, amorphous TiO 2 (a-TiO 2 ) has been proved a valid one for improving the photocatalytic or photoelectrochemical performances of the pristine counterparts. Although the amorphous TiO 2 itself has relatively poor photocatalytic response, its chemical stability makes it a good candidate as protection layer to prevent the corrosion or back reactions. [35,46,47] Moreover, since the amorphous TiO 2 possesses moderated conductivity and can build band energy offset Artificially photocatalytic reduction of CO 2 into valuable chemicals, responding to the call of carbon neutral economy, has aroused considerable interests so far. Among those photocatalysts screened, an emerging and promising alternative of inorganic CsPbBr 3 perovskite has recently been reported. Here, to attain preferable photocatalytic performance, an amorphous-TiO 2 -encapsulated CsPbBr 3 nanocrystal (CsPbBr 3 NC/a-TiO 2 ) hybrid is demonstrated through a solution processing strategy. After optimizing the a-TiO 2 matrix amount by tuning the ...

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Ultrathin TiO2 flakes optimizing solar light driven CO2 reduction

Cited by 113 publications

References 22 publications

Ultrathin‐Film Titania Photocatalyst on Nanocavity for CO₂ Reduction with Boosted Catalytic Efficiencies

Ultrathin‐Film Titania Photocatalyst on Nanocavity for CO₂ Reduction with Boosted Catalytic Efficiencies

Catalysis of Carbon Dioxide Photoreduction on Nanosheets: Fundamentals and Challenges

Amorphous‐TiO₂‐Encapsulated CsPbBr₃ Nanocrystal Composite Photocatalyst with Enhanced Charge Separation and CO₂ Fixation

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Ultrathin TiO2 flakes optimizing solar light driven CO2 reduction

Cited by 113 publications

References 22 publications

Ultrathin‐Film Titania Photocatalyst on Nanocavity for CO2 Reduction with Boosted Catalytic Efficiencies

Ultrathin‐Film Titania Photocatalyst on Nanocavity for CO2 Reduction with Boosted Catalytic Efficiencies

Catalysis of Carbon Dioxide Photoreduction on Nanosheets: Fundamentals and Challenges

Amorphous‐TiO2‐Encapsulated CsPbBr3 Nanocrystal Composite Photocatalyst with Enhanced Charge Separation and CO2 Fixation

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Product

Resources

About

Ultrathin‐Film Titania Photocatalyst on Nanocavity for CO₂ Reduction with Boosted Catalytic Efficiencies

Ultrathin‐Film Titania Photocatalyst on Nanocavity for CO₂ Reduction with Boosted Catalytic Efficiencies

Amorphous‐TiO₂‐Encapsulated CsPbBr₃ Nanocrystal Composite Photocatalyst with Enhanced Charge Separation and CO₂ Fixation