NANO
·
2020
·
IF 1.566
Ke Xu,Xiaosheng Yang,Dagao Sun,Xin Yang,Yumei Zhou,Wei Li,Qindan Yang,Xianjiong Yang,Rong Li,Jian Feng
LaFeO 3 /NiO modified g-C 3 N 4 nanosheets (L-N/CNS) were synthesized by a two-step method. HRTEM results showed that an intimate contact between LaFeO 3 , NiO and N-CNS was successfully established. Ninety percent of phenol was degraded within 120 min, and the hydrogen evolution rate of 171.2 μ mol h − 1 g − 1 was obtained over the L-N/CNS heterojunctions under the visible-light irradiation. It was higher than that of g-C 3 N 4 nanosheets, NiO modified g-C 3 N 4 and LaFeO 3 /g-C 3 N 4 . The ⋅ O 2 − radicals acted the crucial role in the photocatalytic degradation reaction. EIS, PL and time-resolved fluorescence spectra demonstrated that L-N/CNS possessed the highest charge separation efficiency. The intimate contact between LaFeO 3 , NiO and g-C 3 N 4 nanosheets promoted the separation and transfer of photo-induced electron–hole pairs and consequently prolonged the exciton lifetime, and implied more photo-induced electrons could be probably involved in the photocatalytic reactions on the surface of photocatalysts. Thus, the visible-light driven photocatalytic performances of L-N/CNS were effective. This work provided a feasible method to design and construct heterostructures for the exploitation of solar energy.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
PLoS One
·
2022
·Vol. 17
·期 8
·e0273169
·
IF 3.752
Chu-Ya Wang,Xin Fang,Qi Zeng,Heng-Deng Zhou,Yongze Lu
Bismuth(III) oxybromide (BiOBr) is a typical photocatalyst with a unique layered structure. However, the response of BiOBr to visible light is not strong enough for practical application. Moreover, the charge separation efficiency of BiOBr still needs to be improved. In this study, series of Au-doped BiOBr photocatalysts was prepared through a facile one-step hydrothermal method. The as-prepared Au 0.3 -BiOBr nanosheets exhibited an excellent electrochemical performance. The charge separation efficiency of Au 0.3 -BiOBr nanosheets was enhanced by 18.5 times compared with that of BiOBr. The intrinsic photocatalytic activity of Au 0.3 -BiOBr nanosheets in the degradation of tetracycline hydrochloride was approximately twice higher than that of BiOBr under visible light irradiation. In addition, three pathways were identified for the photocatalytic degradation and mineralization of tetracycline hydrochloride, which involve four reactions: hydroxylation, demethylation, ring opening and mineralization. Accordingly, this study proposes a feasible and effective Au-doped BiOBr photocatalyst, and describes a promising strategy for the design and synthesis of high-performance photocatalysts.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Sitong Liu,Guangmin Ren,Xiangchao Meng
A BrO3–-modified Bi2O3/Bi(OH)3 heterojunction photocatalyst was in situ fabricated by a facile one-pot method and applied in photocatalytic nitrogen fixation. In comparison with Bi(OH)3, the Bi2O3/Bi(OH)3 heterojunction has a larger specific surface area from the nanoflower-like morphology and an extended visible light absorption range. Of special importance, the proper band gap match between Bi(OH)3 and Bi2O3, the multiple charge transfer channels via the BrO3– bridge, and the oriented electron migration in the type-II heterojunction mechanism make a stronger charge separation efficiency. Therefore, the BiO/BiHO-3 sample presented the highest photocatalytic nitrogen reduction performance with an ammonia production rate of 45.28 μmol g–1 h–1, which was 10 times higher than that of Bi(OH)3. Photogenerated cavities are consumed during H2O oxidation to produce O2 and H2O2. However, the O2 production was small, and the H2O2 yield was about 78.5 μmol g–1 h–1. For CO2 reduction, the CO production rate was 52.86 μmol g–1 h–1, which was 1.6 and 1.9 times those of Bi(OH)3 and Bi2O3. This work provides useful guidance for the design and synthesis of efficient catalysts for photocatalytic N2 fixation.
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
高影响因子
Small
·
2023
·Vol. 19
·期 45
·2302022
·
IF 13.3
Hai-Bing Zhao,Jia-Nan Huang,Qi Qin,Hong-Yan Chen,Dai-Bin Kuang
Rational design and facile synthesis of efficient environmentally friendly all-inorganic lead-free halide perovskite catalysts are of great significance in photocatalytic CO 2 reduction. Aiming at photogenerated charge carrier separation and CO 2 reaction dynamics, in this paper, a CsCuCl 3 /Cu nanocrystals (NCs) heterojunction catalyst is designed and synthesized via a simple acid-etching solution process by using Cu 2 O as the sacrificed template. Due to the disproportionation reaction of Cu 2 O induced by concentrated hydrochloric acid, Cu NCs can be deposited onto the surface of CsCuCl 3 microcrystals directly and tightly. As revealed by photoelectrochemical analysis, in situ Fourier transform infrared spectra, etc., the Cu NCs contribute a lot to extracting photoelectrons of CsCuCl 3 to improve the charge separation efficiency, regulating the CO 2 adsorption and activation, and also stabilizing the reaction intermediates. Therefore, CsCuCl 3 /Cu heterojunction exhibits a total electron consumption rate of 58.77 µmol g −1 h −1 , which is 2.9-fold of that of single CsCuCl 3 . Moreover, high CH 4 selectivity of up to 92.7% is achieved, which is much higher than that of CsCuCl 3 (50.4%) and most lead-free halide perovskite-based catalysts. This work provides an ingenious but simple strategy to rationally design cocatalysts in situ decorated perovskite catalysts for manipulating both the catalytic activity and the product selectivity.
研究领域:
材料科学
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环境科学
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催化化学
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Liyi Tang,Yangsen Xu,Shuang Tang,Yu-Xiang Yu,Aiyun Meng,Xinzhong Wang,Wei-De Zhang
Photocatalytic hydrogen production utilizing solar energy provides a pivotal strategy for realizing a carbon–neutral society. Cocatalyst-modified semiconductor materials have emerged as promising candidates for photocatalytic applications due to their ability to facilitate the spatial separation and directional migration of photogenerated electron-hole pairs. Nevertheless, those systems often face challenges such as intricate preparation procedures and issues with non-compact recombination. Herein, we report a one-pot thermal treatment approach for synthesizing a composite of Mn 3 O 4 nanoparticles and sodium poly(heptazine imides) (Na-PHI). Mn 3 O 4 nanoparticles were in situ generated and embedded within the Na-PHI matrix during the sintering process. The resulted photocatalyst demonstrated significantly enhanced photoinduced charge separation efficiency, exhibiting approximately 6-fold and 3-fold improvements compared to pristine Mn 3 O 4 and Na-PHI, respectively. The photocatalytic hydrogen evolution rate reached 14 μmol h −1 , nearly 14 times that of Na-PHI (1.2 μmol h −1 ) in the aqueous solution of benzylamine (BA) under visible light illumination (780 nm ≥ λ ≥ 420 nm). Furthermore, the optimized Mn 3 O 4 -Na-PHI sample (Mn-Na-PHI) displayed a remarkably high photocatalytic hydrogen generation rate alongside the synchronous photo-oxidative coupling of aliphatic and aromatic amine under visible light. This work underscores the potential for rational design and synthesis of novel Na-PHI-based functional composites for sustainable energy applications.
研究领域:
材料科学
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能源化学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Xiaoyan Wang,Yu Yuan,Jingru Lai,Xiaoli Shi,Mingye Ding
Solar-driven water splitting for hydrogen production is a pivotal technique for sustainable energy conversion. However, its efficiency is constrained by intermittent solar irradiation and rapid charge recombination. To overcome these limitations, designing a round-the-clock photocatalyst with high charge storage capacity that can still operate effectively under low light flux after sunset and promote charge carrier separation is a promising strategy. Herein, by selecting SrAl 2 O 4 :Eu 2+ /Dy 3+ persistent phosphors as electron-trapped centers and g-C 3 N 4 semiconductor as visible-light photocatalyst, SrAl 2 O 4 :Eu 2+ /Dy 3+ @g-C 3 N 4 composite has been successfully synthesized via in-situ growth strategy to form a conventional type II heterojunction photocatalyst. Benefiting from the excellent ability of charge storage and release from electron traps and the improved electron-hole separation efficiency, the designed round-the-clock photocatalyst exhibits the improved hydrogen production from 153.8 μmol g −1 h −1 to 560 μmol g −1 h −1 under visible-light irradiation, infrared-light-driven H 2 production of 932 μmol g −1 for 3 h and a dark activity of 269.1 μmol g −1 h −1 lasing for 0.5 h. This work provides a promising strategy for designing a highly efficient photocatalyst for wide-spectral-responsive and all-weather photocatalytic hydrogen production.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Fang Li,Dennis Y.C. Leung
A heterojunction structure of BiVO 4 coupled with a narrow bandgap photocatalyst Bi 2 S 3 was fabricated forming a composite material with strong capacity in visible light absorption and enhancement in the separation rate of photogenerated charge carriers owing to their suitable band structures. As a result, efficiency of hydrogen production through photoelectrocatalysis is highly enhanced. The morphology and composition of as-prepared sample electrodes are measured through X-Ray Diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). The performance of the hybrid nanostructure Bi 2 S 3 /BiVO 4 photoelectrode was found to be related to the growing process of Bi 2 S 3 nanowire during the hydrothermal preparation process. The composited Bi 2 S 3 /BiVO 4 photoanode achieved a photoconversion efficiency of 2.9% which is nearly 3-fold that of the bare BiVO 4 electrode under visible light irradiation, while the hydrogen production was greatly enhanced by nearly 5-fold in the photoelectrocatalytic hydrogen production reaction.
研究领域:
材料科学
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能源科学
·
光催化
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Binshu Sun,Jianhong Zheng,Dewu Yin,Huile Jin,Xin Wang,Quanlong Xu,Aili Liu,Shun Wang
Cocatalyst can greatly facilitate the charge separation efficiency and decrease the activation barrier of a specific reaction, thus contributing the improved photocatalytic performance. Herein, PdS/CdS/MoS 2 was synthesized via a facile microwave-assisted approach. Owing to the coexistence of PdS and MoS 2 , respectively serving as oxidation and reduction cocatalyst, PdS/CdS/MoS 2 displayed enhanced photocatalytic performance in both hydrogen production (6610 μmol·g −1 ·h −1 ) and benzylamine oxidation (87% conversion) in comparison with the individual and binary composite counterparts. The improved photocatalytic activity was mainly attributed to the high charge separation efficiency and lowed activation barrier. Furthermore, the introduction of PdS can timely extract photogenerated holes from CdS, which effectively inhibits the photo-corrosion of CdS, endowing it with high stability. This work paves the way for developing efficient chalcogenide photocatalysts.
研究领域:
材料科学
·
光催化技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Ben Chen,Jin Zhang,Jing Yu,Rui wang,Beibei He,Jun Jin,Huanwen Wang,Yansheng Gong
Poor visible light utilization and charge separation efficiency of TiO 2 restrict its extensive application in the photocatalytic field. Herein, a specific Z-scheme TiO 2-x /Cu/ZnO heterojunction was successfully constructed by atomic layer deposition (ALD) technique and spray pyrolysis technology. Benefited from the surface plasmon resonance (SPR) effect of Cu and Z-scheme heterojunction, the visible light absorption capacity was greatly enhanced. Meanwhile, ZnO nanolayer coating, prepared by ALD technique, protects Cu element to hinder its oxidation, thus enhancing the separation efficiency of photogenerated carriers. Therefore, the photocatalytic hydrogen production performance was significant improved, exhibiting a maximum value of 342.0 µmol·g −1 ·h −1 for the optimal B-T-0.1C-10Z (black TiO 2 /0.1Cu/10 nm ZnO) sample without any noble-metal cocatalyst, which is higher than pure TiO 2 (310.7 µmol·g −1 ·h −1 , with 3 wt% Pt) synthesized by spray pyrolysis method under equal conditions. In addition, a possible mechanism for the enhanced performance was briefly discussed based on the experimental results.
研究领域:
材料科学
·
光催化技术
·
表面化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yue-Xin Song,Zheng Wang,Ying-Hui Zhang
The design of photocatalysts based on covalent organic frameworks (COFs) has attracted considerable interest. Nevertheless, the low efficiency in separating photogenerated carriers remains a substantial challenge. Herein, carboxyl modification is employed to enhance the separation efficiency of photogenerated carriers within imine-based porphyrin COFs through the resultant built-in electric field, thereby improving the photocatalytic performance of COFs in hydrogen evolution from water splitting. Spectroscopic and electrochemical analyses reveal that, compared with pristine two-dimensional porphyrin-based COFs (Por-COF), an isostructural carboxyl-modified COF (Por-COOH-COF) exhibits a prolonged excited-state lifetime, reduced exciton binding energy and decreased deactivation probability via radiative processes, and an improved photocurrent response. These improvements result in a hydrogen evolution of 12773 ± 297 μ mol⋅g −1 ⋅h −1 for Por-COOH-COF, approximately four times higher than that of Por-COF (3351 ± 197 μmol⋅g −1 ⋅h −1 ), positioning it among the most efficient metal-free COF photocatalysts reported to date. Density functional theory calculations and in situ X-ray photoelectron spectroscopy analyses indicate that carboxyl modification facilitates charge transfer from the porphine core to the active site of the imine bond (–C N–) under the ultraviolet–visible light irradiation, thereby contributing to the remarkable photocatalytic activity of Por-COOH-COF. This study elucidates how carboxyl groups positively influence photogenerated carrier separation within COFs and provides valuable insights into the development of high-performance metal-free COFs photocatalysts.
研究领域:
材料科学
·
光化学
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DOI
PubMed
高影响因子
Molecular Catalysis
·
2017
·
IF 0
Yanyang Shang,Yongjin Ma,Xi Chen,Xiang Xiong,Jun Pan
Construction of high-efficiency photocatalysis for hydrogen evolution has long been regarded as the significative and challenging work. Herein, we developed a facile ball milling combined calcination method to synthesize a series of sodium-doped graphitic carbon nitride (g-C 3 N 4 ) with different sodium content. The as-prepared samples were characterized by various techniques and applied in hydrogen production under visible-light irradiation. Results showed that the incorporation of sodium would have certain effect on the intrinsic properties of g-C 3 N 4 . The optimal sample with about 3.09 At% of sodium exhibited the highest photoactivity, the hydrogen production rate (176.0 μmol h −1 g −1 ) of which was about 9.9 times higher than that of pure g-C 3 N 4 (17.8 μmol h −1 g −1 ). The tremendously enhanced photoactivity could be ascribed to the expanding visible light absorption and immensely increased separation efficiency of photo-generated charge carriers. Therefore, this study proposes an effective route to synthesize sodium doping g-C 3 N 4 , which is promising for further practical applications in environmental issues.
研究领域:
材料科学
·
环境科学
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DOI
OPTICAL MATERIALS
·
2023
·
IF 3.9
Jia Li,Jianfeng Zheng,Xingmin Liu,Yatao Yang,Xiaojin Han,Zhanggen Huang
Photoelectrochemical reduction of CO 2 with H 2 O into syngas (H 2 /CO) is considered as an important platform to organic chemicals, which can effectively alleviate the greenhouse effect and energy dependence. We synthesized SnO/g-C 3 N 4 p-n junction catalyst with matched energy band, which shows enhanced light absorption performance and photogenerated charge separation efficiency. The M − S plots verified the successful construction of p-n type heterojunctions , and the investigations of LSV , EIS , PL and transient photocurrents test indicate that the recombination rate of charge is well inhibited by the design of p-n heterojunction. In this work, the syngas derived from PEC reduction of CO 2 and H 2 O is achieved by the SnO/g-C 3 N 4 photocathode with a total FE of 70% at an external bias of −1.5 V. In addition, the H 2 /CO molar ratio can be tuned from 1.5 to 10 by controlling the applied voltage. The study may inspire a new thought for the design of high-performance photoelectric catalyst and a promising strategy for PEC CO 2 reduction to valuable carbon-based compounds.
研究领域:
材料科学
·
环境科学
·
能源科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）