JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Junyi Qian,Yunjing Ling,Sai Huang,Zhijie Zhang,Jiayue Xu
Solar-energy-powered CO 2 reduction into valuable chemical fuels represents a highly promising strategy to address the currently energy and environmental issues. Owing to the nontoxicity and robust reduction capability, lead-free Cs 3 Bi 2 Br 9 perovskite quantum dots (PQDs) are regarded as an attractive material for CO 2 photoreduction. Nevertheless, the potential of their applications in this field has been restricted by the severe charge recombination, resulting in unsatisfactory photocatalytic performance. Herein, a step-scheme-based Cs 3 Bi 2 Br 9 @Nb 2 O 5 (CBB@Nb 2 O 5 ) nanocomposite was fabricated by embedding the CBB PQDs into mesoporous Nb 2 O 5 . Experimental studies, along with theoretical calculations, revealed that the charge migration route in the CBB@Nb 2 O 5 nanocomposite conformed to the step-scheme (S-scheme) mode, enabling effective charge separation and strong redox ability preservation. Profiting from the promoted charge separation, as well as the improved CO 2 adsorption contributed by mesoporous Nb 2 O 5 , the CBB@Nb 2 O 5 nanocomposite unveiled superior CO 2 photoreduction performance, with CO evolution rate reaching 143.63 μmol g −1 h −1 . The present study provides a potential strategy to manufacture highly-efficient perovskite-based photocatalysts for achieving carbon neutrality.
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2023
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IF 16.5
Zhijie Zhang,Xuesheng Wang,Huiling Tang,Deben Li,Jiayue Xu
Modulating the internal electric field (IEF) represents a potential strategy to stimulate the photocatalytic activity of heterojunctions, especially S-scheme photocatalysts. Herein, a Cs 3 Bi 2 Br 9 @V O -In 2 O 3 (CBB@V O -In 2 O 3 ) S-scheme heterojunction, of which Cs 3 Bi 2 Br 9 perovskite quantum dots (PQDs) are embedded into mesoporous V O -In 2 O 3 hosts, is rationally designed as a cornerstone for further IEF manipulation. Briefly, by introducing oxygen vacancies (V O ) into the composed reduction semiconductor (mesoporous In 2 O 3 ), an enlarged Fermi level ( E F ) gap between CBB and V O -In 2 O 3 is achieved, yielding an intensified IEF over the CBB@V O -In 2 O 3 heterojunction. Such an enhanced IEF affords a much more robust driving force for directional carrier delivery, leading to accelerated carrier transfer of CBB@V O -In 2 O 3 heterojunction. Consequently, the optimized CBB@V O -In 2 O 3 heterojunction features desirable CO 2 -to-CO conversion efficiency, and its CO production rate reaches 130.96 μmol g −1 h −1 . The reaction intermediates and CO 2 photoconversion pathway were unraveled by in-situ diffuse reflectance infrared Fourier transform spectroscopy. Combining with the DFT calculation, it was revealed that oxygen vacancies in V O -In 2 O 3 act as reactive centers, which optimize the coordination modes of the intermediates, thus reducing the activation energy for photocatalytic CO 2 reduction. Our work demonstrates that the IEF modulation of S-scheme-based heterojunction could significantly boost the charge separation and then to drive efficient catalytic reaction , achieving high-efficiency solar fuel production.
研究领域:
材料科学
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催化化学
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环境科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiang Li,Peng Zhang,Yunqiu Hua,Fucai Cui,Xue Sun,Lin Liu,Yanxiao Bi,Zhongjie Yue,Guodong Zhang,Xutang Tao
Halide perovskites are promising candidates for soft X-ray detection (<80 keV) owing to their high X-ray absorption coefficient, resistivity, and mobility lifetime product. However, the lack of large high-quality single crystals (SCs) renders it challenging to manufacture robust hard X-ray imaging systems (>100 keV) with a low detection limit and stable dark current. Herein, high-quality inch-size two-dimensional (2D) Cs3Bi2Br9 (CBB) single crystals are grown from a melt via the Bridgman method. The crystal quality is enhanced by eliminating inclusions of CsBr-rich phases and restraining the trap-state density, leading to an enhanced resistivity of 1.41 × 1012 Ω cm and a mobility lifetime product of 8.32 × 10–4 cm2 V–1. The Au/CBB/Au single-crystal device exhibits a high sensitivity of 1705 μC Gyair–1 cm–2 in all-inorganic bismuth-based perovskites and an ultralow detection limit of 0.58 nGyair s–1 in all of the bismuth-based perovskites for 120 keV hard X-ray detection. The CBB detector exhibits high work stability with an ultralow dark current drift of 2.8 × 10–10 nA cm–1 s–1 V–1 and long-term air environment reliability under a high electric field of 10 000 V cm–1 owing to the ultrahigh ionic activation energy of the 2D structure. The proposed robust imaging system based on CBB SC is a promising tool for X-ray medical imaging and diagnostics.
研究领域:
材料科学
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医学影像
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辐射探测
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Ou Hai,Peng Li,Jian Li,Bin Qin,Tong Li,Zechuan Qi,Qiang Ren,Yuanting Wu
ABSTRACT A new type of lead-free perovskite Cs 3 Bi 2 Br 9 nanocrystal (NCs) was synthesized by thermal injection method at 190 °C, according to X-ray diffraction and theoretical analysis, the Cs 3 Bi 2 Br 9 NCs belongs to the monoclinic system C12/c1. We report for the first time that the luminescence intensity of broad-peak-emitting Cs 3 Bi 2 Br 9 is significantly improved by doping with K + , and the full-width at half maximum (FWHM) of sample Cs 3 Bi 2 Br 9 :0.2K + is 124 nm. Herein, the stability of Cs 3 Bi 2 Br 9 :xK was monitored and found to have excellent environmental stability, thermal stability, and photostability. In addition, Cs 3 Bi 2 Br 9 :0.2K was coated outside Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ (SMS) to form a core-shell structure composite material Cs 3 Bi 2 Br 9 :0.2K + /SMS@SiO 2 and achieved fine tuning of the afterglow color. This work increases the luminescence intensity of Cs 3 Bi 2 Br 9 by ion doping and exhibits excellent stability, in addition to the cladding of lead-free perovskites with long afterglow materials provides a new application strategy for lead-free perovskites.
研究领域:
材料科学
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光学
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化学
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DOI
高影响因子
INORGANIC CHEMISTRY
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2023
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IF 4.6
Lan Ding,Yongping Ding,Fenghua Bai,Gonglai Chen,Shuwei Zhang,Xiaoxue Yang,Huiqin Li,Xiaojing Wang
Given the global warming caused by excess CO2 accumulation in the atmosphere, it is essential to reduce CO2 by capturing and converting it to chemical feedstock using solar energy. Herein, a novel Cs3Bi2Br9/bismuth-based metal–organic framework (Bi-MOF) composite was prepared via an in situ growth strategy of Cs3Bi2Br9 quantum dots (QDs) on the surface of Bi-MOF nanosheets through coshared bismuth atoms. The prepared Cs3Bi2Br9/Bi-MOF exhibits bifunctional merits for both the high capture and effective conversion of CO2, among which the optimized 3Cs3Bi2Br9/Bi-MOF sample shows a CO2–CO conversion yield as high as 572.24 μmol g–1 h–1 under the irradiation of a 300 W Xe lamp. In addition, the composite shows good stability after five recycles in humid air, and the CO2 photoreduction efficiency does not decrease significantly. The mechanistic investigation uncovers that the intimate atomic-level contact between Cs3Bi2Br9 and Bi-MOF via the coshared atoms not only improves the dispersion of Cs3Bi2Br9 QDs over Bi-MOF nanosheets but also accelerates interfacial charge transfer by forming a strong bonding linkage, which endows it with the best performance of CO2 photoreduction. Our new finding of bismuth-based metal–organic framework/lead-free halide perovskite by cosharing atoms opens a new avenue for a novel preparation strategy of the heterojunction with atomic-level contact and potential applications in capture and photocatalytic conversion of CO2.
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Chao Du,Yunfei Ge,Junyi Qian,Zhijie Zhang
Solar-driven CO 2 conversion into reusable carbon forms is an attractive strategy to. reduce CO 2 emissions and provide feedstocks for industrial production. However, most of present catalysts suffer from poor light utilization and rapid charge recombination, thus severely restricting the efficiency of CO 2 photoreduction. Herein, an innovative strategy of integrating Cs 3 Bi 2 Br 9 and MnO 2 via self-assembly was established, with the aim of designing a multimodal photothermal catalyst for CO 2 reduction under full spectrum. In this hybrid, MnO 2 could combine with CBB to create an S-scheme photocatalyst with promoted carrier separation, and simultaneously acted as a “heater” to facilitate CO 2 photoreduction by effective photothermal conversion. Upon UV–vis-NIR illumination, the CBB/MnO 2 hybrid presented an impressively high CO production rate (R CO = 189.75μmol g −1 h −1 ). Theoretical calculations combined with experimental tests indicated that the excellent catalytic activity of CBB/MnO 2 could be ascribed to the synergetic effect of greatly increased carrier transfer and high photothermal conversion efficiency, resulting in considerably enhanced solar-light-driven photothermocatalysis with no extra heat input. The as-proposed catalyst in this study provides a novel and effective approach to develop highly efficient photothermal catalysts for solar-to-fuel applications.
研究领域:
催化化学
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环境科学
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材料科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Zihao Cui,Peng Wang,Yaqiang Wu,Xiaolei Liu,Guoqiang Chen,Peng Gao,Qianqian Zhang,Zeyan Wang,Zhaoke Zheng,Hefeng Cheng,Yuanyuan Liu,Ying Dai,Baibiao Huang
A facile and effective impregnation method is employed to synthesize the space-confined growth of lead-free halide perovskite Cs 3 Bi 2 Br 9 in MCM-41 molecular sieve. This MCM-41 @CBB (Cs 3 Bi 2 Br 9 ) composite shows an outstanding performance for the photocatalytic reduction of CO 2 to CO at the gas−solid condition under visible-light irradiation. The CO production rate of the MCM-41 @ 50 wt% CBB is determined to be 17.24 μmol g −1 h −1 , which greatly exceeds that of pure CBB (1.89 μmol g −1 h −1 ). The composite is highly stable showing no apparent decrease in the catalytic activity after 8 cycles of repeated experiment. The performance of space-confined growth of CBB nanoparticles in the serial molecular sieve exhibits 2.97–13.4 fold higher than that of pure CBB, respectively, which is superb than CPB (CsPbBr 3 ) and MCM-41 @CPB prepared in the same condition. The results are comparable with those reported for many lead halide perovskites, and are in the top among the lead-free perovskites, especially bismuth halide perovskites.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Xiao Wei,Yue Gao,Shen Zhang,Aixia Chen,Jiali Liu,Fei Wang,Ilhem Kerboua,Mengwei Yan,Jiaqi Wang,Yuhui Zhang
In this work, a non-toxic bismuth-based perovskite quantum dot fluorescent nanocomposite (Cs 3 Bi 2 Br 9 @SiO 2 -MIPs) was constructed for the detection of trace oxytetracycline (OTC) in the ethanol phase, which solves the toxicity problem of perovskite quantum dots and realises the application of non-toxic perovskite quantum dots in analysis and detection, the combination boronate affinity effect and molecularly imprinted technology enables highly selective detection of the Cs 3 Bi 2 Br 9 @SiO 2 -MIPs. The basic structure and optical properties of Cs 3 Bi 2 Br 9 @SiO 2 -MIPs were characterized by various characterization methods, and the optimal detection conditions and fluorescence detection ability of Cs 3 Bi 2 Br 9 @SiO 2 -MIPs for OTC were determined. Under the optimal conditions, the Cs 3 Bi 2 Br 9 @SiO 2 -MIPs had a good linear relationship with OTC in the concentration range of 0.8 ∼ 130 μM, and the detection limit was 0.32 μM. Furthermore, the fluorescence detection mechanism of the Cs 3 Bi 2 Br 9 @SiO 2 -MIPs was investigated in detail, which ultimately revealed that the detection mechanism was a synergistic effect of inner filter effect and fluorescence resonance energy transfer. The Cs 3 Bi 2 Br 9 @SiO 2 -MIPs was successfully applied to the detection of trace OTC in real samples. This work provides a new idea for the construction of environmentally friendly and highly selective perovskite quantum dot fluorescent nanocomposite.
研究领域:
材料科学
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分析化学
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纳米技术
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环境科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Zihao Cui,Qianqian Zhang,Hui Fu,Qihao Liu,Xiaolei Liu,Yaqiang Wu,Peng Gao,Zeyan Wang,Zhaoke Zheng,Hefeng Cheng,Yuanyuan Liu,Ying Dai,Baibiao Huang,Peng Wang
Herein, a facile anti-solvent preparation strategy is proposed to fabricate lead-free halide perovskite Cs 3 Bi 2 Br 9 with TiO 2 , which boosts photocatalytic activation of C(sp 3 )−H bonds in toluene oxidation . TiO 2 not only works as nucleation center to reduce the particle size of perovskite, but could form type II heterojunction with Cs 3 Bi 2 Br 9 , thus improving the photocatalytic performance of the TiO 2 /Cs 3 Bi 2 Br 9 composite. Under AM 1.5 G simulated sunlight irradiation, the optimal TiO 2 /Cs 3 Bi 2 Br 9 composite exhibits both high production rate (9692.5 μmol g −1 h −1 ) and selectivity (91 %) of benzaldehyde product. As verified by in-situ ESR, in-situ FT-IR and DFT calculations, •O 2 − and h + are demonstrated to be the main active species in this process. This work provides a new insight into the design of high-performance lead-free perovskite photocatalysts for organic synthesis.
研究领域:
材料科学
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光催化
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有机合成
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纳米技术
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DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 16
·e202200793
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IF 9.14
Yanmei Guo,Jinxi Chen,Yixin Zhao,Yongbing Lou
Graphical Greener approach to toluene oxidation : Pb-free Cs 3 Bi 2 Br 9 @BiOBr perovskite quantum dots (QDs) are anchored on the surface of NH x -rich monodisperse silica (A−SiO 2 ) via N−Bi chemical bonding to isolate QDs from each other, thus enhancing surface passivation and suppressing optical decay. Additionally, the novel composites as photocatalysts are used to drive the oxidation of toluene and demonstrate astonishing conversion rates with high selectivity. All-inorganic metal halide perovskite quantum dots (QDs) have attracted attention from researchers with their fascinating optoelectronic properties. However, blue-emitting perovskite QDs typically have low photoluminescence quantum yield (PLQY). For potential commercial applications, it is preferable to replace Pb with an element having low toxicity. Here, Pb-free Cs 3 Bi 2 Br 9 @BiOBr perovskite QDs were anchored on the surface of NH x -rich monodisperse silica (A−SiO 2 ) via N−Bi chemical bonding to isolate QDs from each other, thus enhancing efficient surface passivation and suppressing optical decay. Compared to unanchored QDs, Cs 3 Bi 2 Br 9 @BiOBr QDs/A−SiO 2 composites exhibited significantly enhanced blue emission performance, the PLQY of which increased from 16.62 % to 77.26 %, in addition to good water and environmental stability. Finally, the novel composites as photocatalysts were used to drive the oxidation of toluene, a template reaction of C(sp 3 )−H bond activation and demonstrated astonishing conversion rates (4317 μmol g −1 h −1 ) with high selectivity (around 87 %).
研究领域:
材料科学
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化学
·
环境科学
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纳米技术
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhijian Xiao,Wenda Yang,Jing Wang,Shuang Cao,Jingling Yang,Mingshan Zhu
Photocatalysis is a promising technology for removing low concentrations of nitric oxide (NO) from the atmosphere. However, the unsatisfactory photocatalytic NO removal efficiency and the high selectivity for NO 2 in catalysts limit the development of this technology. In this work, we used an in-situ synthesis method to incorporate Cs 3 Bi 2 Br 9 into UiO-66 for efficient and robust photocatalytic NO removal. The Cs 3 Bi 2 Br 9 /UiO-66 catalyst exhibits a 77.6 % NO removal efficiency and low NO 2 selectivity under visible light irradiation at a WHSV of 1,650,000 mL h −1 g −1 , exceeding the efficiencies of Cs 3 Bi 2 Br 9 (36.4 %) and UiO-66 (2.3 %), as well as those of most reported MOF-based photocatalysts. The synergy of weak Lewis acid sites from Cs 3 Bi 2 Br 9 in Cs 3 Bi 2 Br 9 /UiO-66 and the strong Lewis acid sites from UiO-66 promotes the enrichment of NO on the catalyst surface and act as electron traps to induce carrier separation, thereby promoting the generation of O 2 − to achieve high efficiency. This work provides a new idea for the development of catalysts in NO elimination.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Catalysts
·
2026
·Vol. 16
·期 2
·120
·
IF 4
Jin Zhang,Yuxin Zhong,Bin Yu,Xinyue Xu,Dan Xu
Halide perovskites have many advantages in environmental remediation. The photocatalytic performance of halide perovskites is often hindered by low specific surface area and rapid photogenerated carrier recombination. The aim of this work is to prepare a green, novel photocatalyst in the form of biochar-anchored Cs3Bi2Br9perovskite composites. The rose-petal-derived biomass carbon (RC) provides adsorption sites and high electrical conductivity, while the perovskite Cs3Bi2Br9can efficiently capture visible right and degrade pollutants, and the reciprocal effect can enhance the photocatalytic efficiency of the composite. The results of scanning electron microscopy (SEM) showed the Cs3Bi2Br9particles were loaded on the surface of RC. Compared with bare Cs3Bi2Br9, Cs3Bi2Br9/RC composite has a more perfect structure, higher specific surface area, enhanced ability to absorb visible light, and reduced bandgap value. As visible-light-driven photocatalysts, the prepared Cs3Bi2Br9/RC composites can enhance the removal efficiency of Rhodamine B. The Cs3Bi2Br9/RC–0.2 composite displays the highest degradation efficiencies for RhB (10 mg/L), reaching 98% within 60 min. And the rate constant (k) is 1.9 times that of bare Cs3Bi2Br9. The results of electrochemical impedance spectroscopy (EIS) show that the interaction between RC and Cs3Bi2Br9speeds up charge carrier separation and transfer. During photocatalytic process, holes (h+) and superoxide radicals (·O2−) played major roles. The composites also showed excellent stability. It is meaningful to deal with a large number of withered rose petals to make them high-value products. This work not only provides a guideline for the construction of perovskite composites materials but also shows the promising prospects of biochar composites in deep treatment for contaminated water.
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高影响因子
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