Photocatalytic reduction of CO2 with water promoted by Ag clusters in Ag/Ga2O3 photocatalysts

Yamamoto, Masato; Yoshida, Tomoko; Yamamoto, Naoto; Nomoto, T.; Yamamoto, Yuta; Yagi, Shunsuke; Yoshida, Hisao

doi:10.1039/c5ta04815j

Cited by 163 publications

(106 citation statements)

References 32 publications

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“…c) The recyclability of TM10 for the photocatalytic CO 2 reduction. [70] The bands of ν as (COO) at 1456 cm -1 , ν s (COO) at 1365 cm -1 , and ν as (CO) at 1740 cm -1 belong to the absorbed formic acid species. All the elements exhibited no shift of BEs and maintained the same chemical states as they did before reaction, indicating good chemical stability of the sample.…”

Section: Resultsmentioning

confidence: 96%

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1D/2D TiO₂/MoS₂ Hybrid Nanostructures for Enhanced Photocatalytic CO₂ Reduction

Zhu

Cheng

et al. 2018

Advanced Optical Materials

217

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fields. Photocatalytic CO 2 reduction over photocatalysts is a promising approach to overcome these two crises. [1][2][3][4][5][6][7] This approach can recycle CO 2 back to rene wable fuels by using solar energy which is green and inexhaustible. [8][9][10][11][12][13][14] TiO 2 has widely been utilized for photocata lytic CO 2 reduction owing to its stability, nontoxicity, and earth abundance, [15][16][17][18][19][20] but suffers from rapid recombination of electronhole pairs [21][22][23] and large bandgap. [24][25][26] Some strategies were developed to improve the photocata lytic performance including noble metal deposition, [27][28][29][30] doping, [31,32] surface photosensitization, [33,34] and constructing heterojunctions. [35][36][37][38][39] Among them, coupling TiO 2 with narrowband semi conductors is regarded as an efficient way to enhance separation of electron-hole pairs and promote light absorption, such as CdSe, [40,41] CdTe, [42,43] MoS 2 , [44][45][46][47] and CdS. [48][49][50] As a family member of the 2D materials family, transition metal dichal cogenides (TMDs) have recently attracted much attention owing to their remark able optical and electronic properties. As a typical TMD material, MoS 2 has been the subject of a large amount of research in electronic devices, electrochemistry and photocatalysis. [51][52][53][54] MoS 2 has a narrow bandgap around 1.2 eV and its conduction band (CB) level can be facilely adjusted by altering its number of layers due to quantum confinement, [55,56] which makes MoS 2 a highly promising sensitizer for photocatalysis processes, such as hydrogen evolution and CO 2 reduction. Recently, TiO 2 /MoS 2 has been reported for photocatalytic oxidation, photocatalytic H 2 pro duction, and photovoltaics, however, photocatalytic CO 2 con version to solar fuels over fibrous TiO 2 /MoS 2 has barely been reported.Herein, 1D/2D TiO 2 /MoS 2 hybrid nanofibers have been prepared by in situ growing MoS 2 nanosheets onto TiO 2 nanofibers. Such hybrid nanofibers exhibit abundantly porous structure, improved light absorption, and enhanced charge separation over photoexcitation. Therefore, the 1D/2D hybrid shows a superior photocatalytic activity for photoreducing CO 2 into hydrocarbons under UV-visible light irradiation. The synergistic effect of MoS 2 deposition onto TiO 2 fiber is analyzed and discussed in detail to understand the photocatalytic mechanism.Photocatalytic reduction of CO 2 into solar fuels is recognized an attractive approach to solve the environmental and energy crisis. MoS 2 , a type of 2D transition metal dichalcogenides, has attracted significant attention in photoelectronics, sensors and photo/electrocatalytic water splitting owing to its remarkable properties. Nevertheless, to date, MoS 2 is barely used as (co)catalyst for CO 2 photoreduction. Herein, novel 1D/2D TiO 2 /MoS 2 nanostructured hybrid with TiO 2 fibers covered by MoS 2 nanosheets by hydrothermal transformation method is fabricated. The MoS 2 sheet arrays show a lateral size of ≈80 nm and a thickness...

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Section: Resultsmentioning

confidence: 96%

“…a) Photocatalytic CO 2 reduction activities over TiO 2 , MoS 2 , and TiO 2 /MoS 2 nanohybrids. [3,[70][71][72] These peaks are important evidence of absorbed CO 2 on the surface of the sample. c) The recyclability of TM10 for the photocatalytic CO 2 reduction.…”

Section: Resultsmentioning

confidence: 99%

1D/2D TiO₂/MoS₂ Hybrid Nanostructures for Enhanced Photocatalytic CO₂ Reduction

Zhu

Cheng

et al. 2018

Advanced Optical Materials

217

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“…This indicates that the monodentate bicarbonate species are likely converted to the bidentate formate species. It should be noted that the bidentate formate species was confirmed to be the reaction intermediates for CO production in our previous study …”

Section: Resultsmentioning

confidence: 58%

“…Nevertheless, their activity for the CO production was much less than that for Ag/Ga 2 O 3 . Presumably because most of excited electrons were used for the generation of new carbonate species at the strong basic sites, while the excited electrons were used efficiently for the conversion from monodentate bicarbonate to bidentate formate (the reaction intermediates for the CO production) at the weak basic sites in Ag/Ga 2 O 3 . Thus, we propose that the controlling of the basicity of active sites on metal oxide would be one of the important factors to promote CO production in photocatalytic CO 2 reduction with water.…”

Section: Resultsmentioning

confidence: 99%

Study on carbon dioxide reduction with water over metal oxide photocatalysts

Kato

Yamamoto

Akatsuka

et al. 2018

Surface & Interface Analysis

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Various metal oxides with 0.1 wt% Ag loaded as a cocatalyst were prepared by an impregnation method and examined their photocatalytic activity for CO2 reduction with water. Among all the prepared Ag‐loaded metal oxides, Ga2O3, ZrO2, Y2O3, MgO, and La2O3 showed activities for CO and H2 productions under ultraviolet light irradiation. Thus, metal oxides involving metal cations with closed shell electronic structures such as d0, d10, and s0 had the potential for CO2 reduction with water. In situ Fourier transform infrared measurement revealed that the photocatalytic activity and selectivity for CO production are controlled by the amount and chemical states of CO2 adsorbed on the catalyst surface and by the surface basicity, as summarized as follows: Ag/ZrO2 enhanced H2 production rather than CO production due to very little CO2 adsorption. Ag/Ga2O3 exhibited the highest activity for CO production, because adsorbed monodentate bicarbonate was effectively converted to bidentate formate being the reaction intermediates for CO production owing to its weak surface basicity. Ag/La2O3, Ag/Y2O3, and Ag/MgO having both weak and strong basic sites adsorbed larger amount of carbonate species including their ions and suppressed H2 production. However, the adsorbed carbonate species were hardly converted to the bidentate formate.

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“…Thus, photocatalytic CO 2 reduction benefits to energy saving and environmental protection and has been considered as the most ideal CO 2 processing technology. [16][17][18] As a novel type of luminescent carbon nanoparticles, carbon dots (CDs) exhibit fluorescence performance similar to conventional quantum dots. Nevertheless, in practical applications, these semiconductor photocatalysts often suffer from low quantum efficiency and narrow spectral response range.…”

Section: Introductionmentioning

confidence: 99%

Preparation and photocatalytic CO₂ reduction performance of silver nanoparticles coated with coal-based carbon dots

et al. 2018

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Summary Currently, the best approach to solve the increasing CO2 emission and energy shortage problems comes from catalytic CO2 reduction into organic fuels using solar radiation. Using inexpensive coal samples, here we synthesized coal‐based luminescent carbon dots (CDs) by H2O2 oxidation method. Coated composite nanoparticle Ag/CDs were then fabricated using a simple silver mirror reaction to attach CDs in situ to Ag surface. The lattice structure of Ag/CDs was characterized, and the performance of photocatalytic CO2 reduction into hydrocarbons was investigated. The surface of the composite contains a large number of oxygen groups and mesoporous interface from accumulation of uniform‐sized particles, demonstrating good adsorption capability for CO2. Thanks to the broad absorption spectra extending into the visible range and low recombination rate of photogenerated electron‐hole pairs, the composite nanoparticles can be applied in the photocatalytic CO2 reduction. Compared with individual Ag and CDs, Ag/CDs exhibit enhanced photocatalytic activity for CO2 reduction.

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Photocatalytic reduction of CO₂ with water promoted by Ag clusters in Ag/Ga₂O₃ photocatalysts

Cited by 163 publications

References 32 publications

1D/2D TiO₂/MoS₂ Hybrid Nanostructures for Enhanced Photocatalytic CO₂ Reduction

1D/2D TiO₂/MoS₂ Hybrid Nanostructures for Enhanced Photocatalytic CO₂ Reduction

Study on carbon dioxide reduction with water over metal oxide photocatalysts

Preparation and photocatalytic CO₂ reduction performance of silver nanoparticles coated with coal-based carbon dots

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Photocatalytic reduction of CO2 with water promoted by Ag clusters in Ag/Ga2O3 photocatalysts

Cited by 163 publications

References 32 publications

1D/2D TiO2/MoS2 Hybrid Nanostructures for Enhanced Photocatalytic CO2 Reduction

1D/2D TiO2/MoS2 Hybrid Nanostructures for Enhanced Photocatalytic CO2 Reduction

Study on carbon dioxide reduction with water over metal oxide photocatalysts

Preparation and photocatalytic CO2 reduction performance of silver nanoparticles coated with coal-based carbon dots

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Product

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Photocatalytic reduction of CO₂ with water promoted by Ag clusters in Ag/Ga₂O₃ photocatalysts

1D/2D TiO₂/MoS₂ Hybrid Nanostructures for Enhanced Photocatalytic CO₂ Reduction

1D/2D TiO₂/MoS₂ Hybrid Nanostructures for Enhanced Photocatalytic CO₂ Reduction

Preparation and photocatalytic CO₂ reduction performance of silver nanoparticles coated with coal-based carbon dots