Sustained, photocatalytic CO2 reduction to CH4 in a continuous flow reactor by earth-abundant materials: Reduced titania-Cu2O Z-scheme heterostructures

Ali, Shahzad; Lee, Jun-Ho; Kim, Hwapyong; Hwang, Yunju; Razzaq, Abdul; Jung, Jin Seung; Cho, Chang‐Hee; In, Su‐Il

doi:10.1016/j.apcatb.2020.119344

Cited by 109 publications

(36 citation statements)

References 72 publications

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“…•− ) culminated by generation of valence band holes (h vb+ ) and conduction band electrons (e cb− ) and their transfer accordingly. Such a pathway is supported by previous literature studies [9,17,19,48,56,57]. The photocatalytic activity of the 0.05CuWO 4 -TiO 2 composite under UV light irradiation of 365 nm wavelength is illustrated in Scheme 1.…”

Section: Possible Mechanism Of Cuwo 4 -Tiosupporting

confidence: 82%

“…Due to favored energetics, the generated electrons of the TiO 2 conduction band drift into the conduction band of the CuWO 4 n-type semiconductor. During that time, electron-hole (e − /h + ) charge recombination is suppressed as charges are more efficiently separated at the heterojunctions [56,57]. Consequently, more active species (O 2…”

Section: Possible Mechanism Of Cuwo 4 -Tiomentioning

confidence: 99%

“…During that time, electron-hole (e − /h + ) charge recombination is suppressed as charges are more efficiently separated at the heterojunctions [56,57]. Consequently, more active species (O2 •− , • OH, h + ) are then becoming available to drive the photocatalytic reaction, which is therefore enhanced in comparison to either pure TiO2 or CuWO4 synthesized materials (Figure 7).…”

Section: Possible Mechanism Of Cuwo 4 -Tiomentioning

confidence: 99%

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Enhanced Photocatalytic Activity of CuWO4 Doped TiO2 Photocatalyst Towards Carbamazepine Removal under UV Irradiation

et al. 2021

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Abatement of contaminants of emerging concerns (CECs) in water sources has been widely studied employing TiO2 based heterogeneous photocatalysis. However, low quantum energy yield among other limitations of titania has led to its modification with other semiconductor materials for improved photocatalytic activity. In this work, a 0.05 wt.% CuWO4 over TiO2 was prepared as a powder composite. Each component part synthesized via the sol-gel method for TiO2, and CuWO4 by co-precipitation assisted hydrothermal method from precursor salts, underwent gentle mechanical agitation. Homogenization of the nanopowder precursors was performed by zirconia ball milling for 2 h. The final material was obtained after annealing at 500 °C for 3.5 h. Structural and morphological characterization of the synthesized material has been achieved employing X-ray diffraction (XRD), Fourier transform infra-red (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET) N2 adsorption–desorption analysis, Scanning electron microscopy-coupled Energy dispersive X-ray spectroscopy (SEM-EDS), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectroscopy (UV-vis DRS) for optical characterization. The 0.05 wt.% CuWO4-TiO2 catalyst was investigated for its photocatalytic activity over carbamazepine (CBZ), achieving a degradation of almost 100% after 2 h irradiation. A comparison with pure TiO2 prepared under those same conditions was made. The effect of pH, chemical scavengers, H2O2 as well as contaminant ion effects (anions, cations), and humic acid (HA) was investigated, and their related influences on the photocatalyst efficiency towards CBZ degradation highlighted accordingly.

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Section: Possible Mechanism Of Cuwo 4 -Tiosupporting

confidence: 82%

Section: Possible Mechanism Of Cuwo 4 -Tiomentioning

confidence: 99%

Section: Possible Mechanism Of Cuwo 4 -Tiomentioning

confidence: 99%

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Enhanced Photocatalytic Activity of CuWO4 Doped TiO2 Photocatalyst Towards Carbamazepine Removal under UV Irradiation

et al. 2021

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“…In particular, the photocatalytic performance depends strongly on the photogenerated charge separation and transfer kinetics in the bulk and on the surface of photocatalysts 9 . As such, efforts have been made to improve the photocatalytic performance by using cocatalyst to increase the charge separation 10 , surface modification strategies to enrich the reactive sites 11 and formation of heterojunction structures or facet junctions to enhance anisotropic photogenerated charge migration [12][13][14] . However, CO 2 conversion efficiencies are still low and not yet sufficient for potential industrial applications 15 .…”

mentioning

confidence: 99%

Synergy of ferroelectric polarization and oxygen vacancy to promote CO2 photoreduction

et al. 2021

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Solar-light driven CO2 reduction into value-added chemicals and fuels emerges as a significant approach for CO2 conversion. However, inefficient electron-hole separation and the complex multi-electrons transfer processes hamper the efficiency of CO2 photoreduction. Herein, we prepare ferroelectric Bi3TiNbO9 nanosheets and employ corona poling to strengthen their ferroelectric polarization to facilitate the bulk charge separation within Bi3TiNbO9 nanosheets. Furthermore, surface oxygen vacancies are introduced to extend the photo-absorption of the synthesized materials and also to promote the adsorption and activation of CO2 molecules on the catalysts’ surface. More importantly, the oxygen vacancies exert a pinning effect on ferroelectric domains that enables Bi3TiNbO9 nanosheets to maintain superb ferroelectric polarization, tackling above-mentioned key challenges in photocatalytic CO2 reduction. This work highlights the importance of ferroelectric properties and controlled surface defect engineering, and emphasizes the key roles of tuning bulk and surface properties in enhancing the CO2 photoreduction performance.

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“…Photocatalytic CO 2 reduction, which transforms solar energy into usable chemical fuels, has drawn considerable attention for solving environmental pollution and global energy problems [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Many attempts have been taken to upgrade the photocatalytic CO 2 conversion process in terms of material design.…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in Lead and Lead-Free Halide Perovskite Nanostructures towards Photocatalytic CO2 Reduction

Hiragond

Powar

2020

Nanomaterials

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Perovskite materials have been widely considered as emerging photocatalysts for CO2 reduction due to their extraordinary physicochemical and optical properties. Perovskites offer a wide range of benefits compared to conventional semiconductors, including tunable bandgap, high surface energy, high charge carrier lifetime, and flexible crystal structure, making them ideal for high-performance photocatalytic CO2 reduction. Notably, defect-induced perovskites, for example, crystallographic defects in perovskites, have given excellent opportunities to tune perovskites’ catalytic properties. Recently, lead (Pb) halide perovskite and their composites or heterojunction with other semiconductors, metal nanoparticles (NPs), metal complexes, graphene, and metal-organic frameworks (MOFs) have been well established for CO2 conversion. Besides, various halide perovskites have come under focus to avoid the toxicity of lead-based materials. Therefore, we reviewed the recent progress made by Pb and Pb-free halide perovskites in photo-assisted CO2 reduction into useful chemicals. We also discussed the importance of various factors like change in solvent, structure defects, and compositions in the fabrication of halide perovskites to efficiently convert CO2 into value-added products.

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Sustained, photocatalytic CO2 reduction to CH4 in a continuous flow reactor by earth-abundant materials: Reduced titania-Cu2O Z-scheme heterostructures

Cited by 109 publications

References 72 publications

Enhanced Photocatalytic Activity of CuWO4 Doped TiO2 Photocatalyst Towards Carbamazepine Removal under UV Irradiation

Enhanced Photocatalytic Activity of CuWO4 Doped TiO2 Photocatalyst Towards Carbamazepine Removal under UV Irradiation

Synergy of ferroelectric polarization and oxygen vacancy to promote CO2 photoreduction

Recent Developments in Lead and Lead-Free Halide Perovskite Nanostructures towards Photocatalytic CO2 Reduction

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