2D/2D Heterojunction of Ultrathin MXene/Bi2WO6 Nanosheets for Improved Photocatalytic CO2 Reduction

Cao, Shaowen; Shen, Baojia; Tong, Tong; Fu, Junwei; Wang, Yuanyuan

doi:10.1002/adfm.201800136

Cited by 1,285 publications

(664 citation statements)

References 63 publications

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“…[1][2][3][4][5] Photocatalytic CO 2 reduction into chemical fuels powered by [1][2][3][4][5] Photocatalytic CO 2 reduction into chemical fuels powered by …”

Section: Introductionmentioning

confidence: 99%

Graphdiyne: A New Photocatalytic CO₂ Reduction Cocatalyst

Meng

Zhu

et al. 2019

Adv Funct Materials

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240

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Exploring new and efficient cocatalysts to boost photocatalytic CO 2 reduction is of critical importance for solar-to-fuel conversion. As an emerging carbon allotrope, graphdiyne (GDY) features 2D characteristics and unique carboncarbon bonds. Herein, a novel GDY cocatalyst coupled TiO 2 nanofibers for boosted photocatalytic CO 2 reduction, synthesized by an electrostatic selfassembly approach is reported. First-principle calculation and in situ X-ray photoelectron spectroscopy measurement reveal that the delocalized electrons in GDY can hybrid with the empty orbitals in TiO 2 within the TiO 2 /GDY network, leading to the formation of an internal electric field at the interfaces, pointing from GDY to TiO 2 . The theoretical simulation further implies strong chemisorption and deformation of CO 2 molecules upon GDY, which can be verified by in situ diffuse reflectance infrared Fourier transform spectroscopy. These effects, in combination with the photothermal effect of GDY, result in enhanced charge separation and directed electron transfer, enhanced CO 2 adsorption and activation as well as accelerated catalytic reactions over the TiO 2 /GDY heterostructure, thereby resulting in significantly improved CO 2 photoreduction efficiency and meanwhile with remarkable selectivity. This work demonstrates that GYD can function as a highly effective cocatalyst for solar energy harvesting and may be used in other catalysis processes.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201904256. solar irradiation is recognized as a potential solution to these issues. [6][7][8][9][10][11] As one of the most popular photocatalytic materials, TiO 2 is chemically stable, nontoxic and earth-abundant to be proverbially utilized for CO 2 photoreduction. [12][13][14][15][16] However, the photocatalytic efficiency of unitary TiO 2 is still far away from the practical requirements largely due to its rapid electron-hole recombination. [17][18][19][20] Modifying TiO 2 with a cocatalyst has been widely adopted to tackle this issue owing to the advantages of cocatalysts such as improving the selectivity, minimizing the overpotentials, promoting the charge separation, enhancing the adsorption of CO 2 , suppressing the photocorrosion and so on. [21,22] Up to now, various cocatalysts have been exploited to promote the photocatalytic performance of TiO 2 and the most widely used cocatalysts were noble metals, such as Pt, Pd, Au, Ag, and their alloys. [23][24][25][26][27][28] However, noble metals are scarce and expensive, hindering their prospect severely. Therefore, it is of significance to search for novel cocatalysts for TiO 2 -based photocatalyst to improve the photocatalytic CO 2 reduction performance.Carbon allotropes such as 0D carbon dot, 1D carbon nanotube and 2D graphene have attracted significant interests in many fields including catalysis, new device structures and solar energy harvesting. [29][30][31] Particularly, the discovery of graphene has raised a wave of new ...

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“…[1][2][3][4][5] Photocatalytic CO 2 reduction into chemical fuels powered by [1][2][3][4][5] Photocatalytic CO 2 reduction into chemical fuels powered by …”

Section: Introductionmentioning

confidence: 99%

Graphdiyne: A New Photocatalytic CO₂ Reduction Cocatalyst

Meng

Zhu

et al. 2019

Adv Funct Materials

Self Cite

240

178

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“…One of the very useful applications of these materials is in the electrochemical energy storage, where the advantage of 2D materials – large surface area – is fully utilized. Besides the transition metal dichalcogenides and graphene, 2‐D layered titanium carbide is also studied for its remarkable electrochemical properties . Ti 3 C 2 is a prototypical MXene, it was produced for the first time by etching of aluminum from Ti 3 AlC 2 MAX phase in 2011 (Scheme ).…”

Section: Introductionmentioning

confidence: 99%

2D Stacks of MXene Ti₃C₂ and 1T‐Phase WS₂ with Enhanced Capacitive Behavior

et al. 2019

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MXene‐based materials play an important role in the field of energy storage devices, owing to their layered structure with gravimetric/volumetric capacitances higher than that of graphene. However, owing to their tendency to bond to hydrogen or due to van der Walls forces, their performance is often reduced by the restacking of layers and subsequent reduction of their active surface area. In this work, we investigate the charge storage capacitance enhancement after inserting 1T‐phase WS2 nanospacers into the matrix of MXene Ti3C2 through a simple sonication‐assisted procedure, forming a 2D stack structure. We demonstrated that each exfoliation step enhances the capacitive behavior when compared to the starting MAX phase (Ti3AlC2). This new sandwich material shall have profound influence on the construction of 2D materials‐based supercapacitors.

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“…Emission of carbon dioxide (CO 2 ) from consumption of fossil fuels has led to serious global climate issues, ocean acidification and other environmental concerns. International attention to those concerns have stimulated governmental regulations and extensive research efforts . Among various solutions, photochemical reduction of CO 2 into high‐value chemicals and fuels using solar energy is ultimately a sustainable solution to the problems .…”

Section: Introductionmentioning

confidence: 99%

Polydopamine and Barbituric Acid Co‐Modified Carbon Nitride Nanospheres for Highly Active and Selective Photocatalytic CO₂ Reduction

Zhang

Liu

et al. 2018

Eur J Inorg Chem

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Carbon nitride nanospheres modified with polydopamine and barbituric acid (BA‐CNS‐PDA) were successfully prepared by following a template‐copolymerization and post‐modification strategy. The photocatalytic CO2 reduction was carried out using BA‐CNS‐PDA as photocatalyst, Co(bpy)32+ as the cocatalyst and TEOA as the sacrificial electron donor. The productivity and selectivity for photocatalytic reduction of CO2 to CO on BA20‐CNS‐PDA15 under visible‐light for 4 h were measured to be 158 µmol and 86.0 %, respectively, and are nearly 5 and 1.5 times, respectively, that of unmodified CNS. Optical characterization indicates that the outstanding photocatalytic CO2 reduction performance is a result of improved charge separation and transfer due to copolymerization with barbituric acid and enhanced visible light absorption due to polydopamine. The adsorption isotherm of CO2 demonstrates that polydopamine increase CO2 adsorption capacity and promote CO2 activation due to the presence of the amino groups.

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2D/2D Heterojunction of Ultrathin MXene/Bi₂WO₆ Nanosheets for Improved Photocatalytic CO₂ Reduction

Cited by 1,285 publications

References 63 publications

Graphdiyne: A New Photocatalytic CO₂ Reduction Cocatalyst

Graphdiyne: A New Photocatalytic CO₂ Reduction Cocatalyst

2D Stacks of MXene Ti₃C₂ and 1T‐Phase WS₂ with Enhanced Capacitive Behavior

Polydopamine and Barbituric Acid Co‐Modified Carbon Nitride Nanospheres for Highly Active and Selective Photocatalytic CO₂ Reduction

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2D/2D Heterojunction of Ultrathin MXene/Bi2WO6 Nanosheets for Improved Photocatalytic CO2 Reduction

Cited by 1,285 publications

References 63 publications

Graphdiyne: A New Photocatalytic CO2 Reduction Cocatalyst

Graphdiyne: A New Photocatalytic CO2 Reduction Cocatalyst

2D Stacks of MXene Ti3C2 and 1T‐Phase WS2 with Enhanced Capacitive Behavior

Polydopamine and Barbituric Acid Co‐Modified Carbon Nitride Nanospheres for Highly Active and Selective Photocatalytic CO2 Reduction

Contact Info

Product

Resources

About

2D/2D Heterojunction of Ultrathin MXene/Bi₂WO₆ Nanosheets for Improved Photocatalytic CO₂ Reduction

Graphdiyne: A New Photocatalytic CO₂ Reduction Cocatalyst

Graphdiyne: A New Photocatalytic CO₂ Reduction Cocatalyst

2D Stacks of MXene Ti₃C₂ and 1T‐Phase WS₂ with Enhanced Capacitive Behavior

Polydopamine and Barbituric Acid Co‐Modified Carbon Nitride Nanospheres for Highly Active and Selective Photocatalytic CO₂ Reduction