Facet junction of BiOBr nanosheets boosting spatial charge separation for CO2 photoreduction

Meng, Jiazhi; Duan, Youyu; Jing, Shaojie; Ma, Jing; Wang, Kaiwen; Zhou, Kai; Ban, Chaogang; Wang, Yan; Hu, Bihao; Yu, Danmei; Gan, Li‐Yong; Zhou, Xiaowei

doi:10.1016/j.nanoen.2021.106671

Cited by 100 publications

(25 citation statements)

References 51 publications

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“…The conversion of CO 2 into value-added fuels and feedstock is increasingly attractive due to the growing urgency to advance a sustainable carbon-neutral economy [1]. Lightdriven CRR over photocatalysts is one of the most promising conversion technologies since it can proceed under relatively mild conditions, which facilitates its resource utilization [2][3][4][5][6][7][8][9][10]. In the past decades, great progress has been made.…”

Section: Introductionmentioning

confidence: 99%

Isotype Heterojunction-Boosted CO2 Photoreduction to CO

et al. 2022

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Photocatalytic conversion of CO2 to high-value products plays a crucial role in the global pursuit of carbon–neutral economy. Junction photocatalysts, such as the isotype heterojunctions, offer an ideal paradigm to navigate the photocatalytic CO2 reduction reaction (CRR). Herein, we elucidate the behaviors of isotype heterojunctions toward photocatalytic CRR over a representative photocatalyst, g-C3N4. Impressively, the isotype heterojunctions possess a significantly higher efficiency for the spatial separation and transfer of photogenerated carriers than the single components. Along with the intrinsically outstanding stability, the isotype heterojunctions exhibit an exceptional and stable activity toward the CO2 photoreduction to CO. More importantly, by combining quantitative in situ technique with the first-principles modeling, we elucidate that the enhanced photoinduced charge dynamics promotes the production of key intermediates and thus the whole reaction kinetics.

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Section: Introductionmentioning

confidence: 99%

Isotype Heterojunction-Boosted CO2 Photoreduction to CO

et al. 2022

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“…Crystal facet engineering of semiconductor photocatalysts has been extensively investigated to boost photocatalytic efficiency, and the concept of “surface heterojunction” has gained increasing concern since its discovery in TiO . Similar to the traditional heterojunctions between semiconductors, surface heterojunctions or facet junctions are also beneficial for the separation and transfer of photogenerated carriers. − Construction of facet junctions to optimize photocatalytic and photoelectrocatalytic performance has been successfully applied in a range of semiconductor photocatalysts in addition to TiO 2 , such as BiVO 4 , − BiOBr, , BiOCl, − Cu 2 O, CdS, , ZnO, and so forth. However, with respect to the large amount of semiconductor photocatalysts reported, the application systems of facet junctions are still very limited.…”

Section: Introductionmentioning

confidence: 99%

Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi₃Ti_xNb_2–xO₉ Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity

Cui

Guo

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Constructing facet junction in semiconductor photocatalysts has been demonstrated as an effective method to promote charge-carrier separation and suppress carrier recombination. Herein, we proposed a novel but facile self-doping strategy to regulate the crystal facet exposure ratio in ferroelectric Bi3Ti x Nb2–x O9 single-crystalline nanosheets, thereby optimizing its facet junction effect. Through tuning the atomic ratio of Ti and Nb, the exposure ratio of {001} and {110} crystal planes in Bi3Ti x Nb2–x O9 nanosheets can be delicately modulated, and more {110} facets were exposed with the increase of the Ti/Nb atomic ratio as evidenced by the X-ray diffraction and scanning electron microscopy results. A facet junction between {110} and {001} crystal planes was verified based on the density functional theory calculation and photodeposition experiment results. Photogenerated electrons tend to accumulate in {110}, while holes gathered in {001} crystal planes. Owing to the optimal facet junction effect, the sample of Ti1.05 shows the most efficient charge-carrier separation and transportation compared to Ti0.95 and Ti1.00 as supported by the photoluminescence, surface photovoltage, photoelectrochemistry, and electron paramagnetic resonance (EPR) results. In addition, the oxygen vacancy arising from the inequivalent substitution of Nb5+ by Ti4+ as proved by X-ray photoelectron spectroscopy and EPR results and the enhanced ferroelectricity supported by P–E loops can also assist charge-carrier separation and migration. Benefiting from these properties, Ti1.05 outperformed Ti0.95 and Ti1.00 in the photodegradation of organic dye and antibiotic molecules. Meanwhile, the excellent antibacterial activity of Ti1.05 under visible light was also demonstrated by the Escherichia coli sterilization experiment. This work not only presents a novel pathway to adjust the facet junction but also provides new deep insights into the crystal facet engineering in ferroelectrics as photocatalysts.

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“…In addition, the quantitative intensity ratio of I 102 / I 001 was 0.11 over pure BiOBr, 0.32 over 0.6N-BiOBr, 1.23 over 0.9N-BiOBr, and 0.75 over 1.2 N-BiOBr, respectively, indicating that 0.9N-BiOBr exposes more (102) preferential facets by N doping in BiOBr. 37 Moreover, a further increase in urea addition led to a decrease in the intensity of the (102) plane of 1.2N-BiOBr.…”

Section: Resultsmentioning

confidence: 97%

Nitrogen-doped BiOBr nanosheets with preferentially exposed (102) facets enhanced visible-light photoreactivity

Yang

et al. 2023

New J. Chem.

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Facet junction of BiOBr nanosheets boosting spatial charge separation for CO2 photoreduction

Cited by 100 publications

References 51 publications

Isotype Heterojunction-Boosted CO2 Photoreduction to CO

Isotype Heterojunction-Boosted CO2 Photoreduction to CO

Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi₃Ti_xNb_2–xO₉ Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity

Nitrogen-doped BiOBr nanosheets with preferentially exposed (102) facets enhanced visible-light photoreactivity

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Facet junction of BiOBr nanosheets boosting spatial charge separation for CO2 photoreduction

Cited by 100 publications

References 51 publications

Isotype Heterojunction-Boosted CO2 Photoreduction to CO

Isotype Heterojunction-Boosted CO2 Photoreduction to CO

Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi3TixNb2–xO9 Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity

Nitrogen-doped BiOBr nanosheets with preferentially exposed (102) facets enhanced visible-light photoreactivity

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Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi₃Ti_xNb_2–xO₉ Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity