JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Danni Zeng,Tingzhe Shen,Yadong Hu,Fengjiao Liu,Ze Liu,Jun Song,Rongfeng Guan,Changjian Zhou
Photothermal synergistic catalysis is a novel technology that converts energy. In this study, ZnIn 2 S 4 with S-vacancy (ZIS-Vs) is combined with Nickel, Nickle Oxide and Carbon Nanofiber aggregates (Ni-NiO@CNFs) to create a multi-interface coupled photocatalyst with double Schottky barrier, double channel and mixed photothermal conversion effect. Theoretical calculation confirms that the Gibbs free energy (ΔG *H ) of the S-scheme heterojunction in the composite material is −0.07 eV, which is close to 0. This promotes the adsorption of H* and accelerates the formation of H 2 . Internal photothermal catalysis is achieved by visible-near infrared (Vis-NIR, RT) irradiation. The internal photothermal catalytic hydrogen production rate of the best sample (0.9Ni-NiO@CNFs/ZIS-Vs) is as high as 17.24 mmol·g −1 ·h −1 , and its photothermal conversion efficiency (η) is as high as 61.42 %. Its hydrogen production efficiency is 20.52 times that of ZIS-Vs (0.84 mmol·g −1 ·h −1 ) under visible light (Vis, RT) conditions. When the Vis-NIR light source is combined with external heating (75 ℃), the hydrogen production efficiency is further improved, and the hydrogen production efficiency (29.16 mmol·g −1 ·h −1 ) is 26.75 times that of ZIS-Vs (1.09 mmol·g −1 ·h −1 , Vis-NIR, RT). Further analysis shows that the increase in hydrogen production resulted from the apparent activation energy (Ea) of the catalyst decreasing from 16.7 kJ·mol −1 to 9.28 kJ·mol −1 . This study provides a valuable prototype for the design of an efficient photothermal synergistic catalytic system.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Qiangshun Wu,Siqi Chai,Hanpei Yang,Zhao Gao,Ruichen Zhang,Lina Wang,Li Kang
A novel composite photocatalyst of Bi/BiOBr-Bi 5+ was successfully developed via a facile two-step procedure. The co-existence of self-doped Bi 5+ and in-situ deposited Bi(M) was evidenced by X-ray diffraction, field-emission transmission electron microscope and X-ray photoelectron spectra. Its photocatalytic performance on the Rhodamine B (RhB) degradation under visible light irradiation displayed a significant improvement compared with that of Bi/BiOBr or BiOBr-Bi 5+ , which was mainly attributed to the synergistic effect between Bi(M) and Bi 5+ . For Bi(M), enhancement of visible-light absorption capacity was beneficial from surface plasmon resonance (SPR) effect while the promoted separation of photoinduced charge carriers was attributed to the formation of oxygen vacancies (OVs) and Schottky-barrier. Besides, Bi(M) induced a predominant exposure of (0 1 0) facet, further enhancing photocatalytic performance. Differently, Bi 5+ brought a narrowed bandgap of BiOBr in increasing the carrier density. A plausible mechanism towards RhB degradation was proposed based on analysis of electron transfer pathway and determination of dominant active species. The work offers new routes to enhance the photocatalytic performance of Bi-based materials without introducing any impurities.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
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IF 10.7
Ying-jie Sun,Xue-ting Liu,Xin-jie Zhao,Xiao-jing Wang,Jun Zhao,Yu-pei Li,Hui-ying Mu,Fa-tang Li
The tuning of the Mott–Schottky barrier for obtaining superior separation and transfer efficiency of photogenerated carriers is significant for metallic co-catalyst-modified photocatalytic materials. Metallic cobalt phosphide (CoP) has been regarded as a promising co-catalyst for replacing Pt in the photocatalytic hydrogen evolution reaction (HER). However, it is still challenging to enhance the kinetics of CoP for the HER while lowering the Schottky barrier and improving electron transport properties. Herein, Mo metal was introduced into CoP and graphite carbon nitride (g-C3N4) as a bridge of electron transfer channels for synchronous tuning of the Schottky barrier. The analyses showed that the original Schottky contact between CoP and g-C3N4 was transformed into an ohmic contact by the introduction of metallic Mo, which caused a decrease in the Schottky barrier and even improved the charge transfer, lowered the HER potential, and accelerated the HER kinetics process of CoP. After rational assembly, the optimum photocatalyst (Mo-CoP@CN-1.0) showed a remarkable photocatalytic HER rate of 1.47 mmol g−1 h−1 under visible light irradiation, which was about twice as high as that of the optimal Pt modified g-C3N4. This study provides a new prospect for the rational design of a high-efficiency co-catalyst and provides a new way for regulating the Mott–Schottky barrier.
研究领域:
材料科学
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光催化
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产品关联
DOI
高影响因子
Nano Hybrids and Composites
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2023
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IF 0.4
Yan Hua Lu,Min Min Xu,Chen Jie Zhang,Ya Xian Yuan,Jian Lin Yao
The rapid recombination of carriers on plasmon metal nanoparticles leads to relatively low efficiency of traditional photocatalysts. The combination of a metal and a semiconductor allows to the separation of hot electrons and holes to improve photocatalytic efficiency. In this study, Au nanoparticles were integrated with semiconductor TiO2 nanoparticles of different sizes to improve the photocatalytic activity. Various techniques have been developed to study the mechanism of catalytic activity, the significance of band bending in the space-charge region within metal–semiconductor nanocomposites, and the built-in electric field. The results provide theoretical and experimental evidence for the design of a high-performance surface plasmon resonance (SPR) photocatalyst. To reveal the interface band structure, surface-enhanced Raman spectroscopy (SERS) was employed to analyze the band structure of the TiO2–metal composites. This approach was based on the electrochemical Stark effect and a molecular probe strategy, combined with X-ray photoelectron spectroscopy (XPS), Electrochemical impedance spectroscopy (EIS), and other techniques at the molecular level. The results demonstrated that charge transfer occurred spontaneously between the Au nanoparticles and TiO2, and that the TiO2–metal interface constitutes a Schottky barrier. Moreover, the size of the TiO2 nanoparticles affects the degree of band bending. Optimal state matching was achieved with TiO2 (60 nm)–Au, improving the photocatalytic activity of the nanocomposite. The photocatalytic coupling reaction of p-aminothiophenol (PATP) acted as a probe to study the catalytic performance of TiO2–metal nanocomposites. The results revealed that the introduction of TiO2 improves the SPR catalytic activity of Au, mainly through the efficient separation of electrons and holes at the TiO2–metal interface.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 7
·4848-4860
·
IF 2.599
Shen Jing,Xue Jinjuan,Chen Zixiao,Ni Jie,Tang Bo,He Guangyu,Chen Haiqun
Here, we report a simple approach to fabricate 3D hierarchical peony-like Ag/Bi 2 WO 6 hybrid photocatalyst through one-step hydrothermal method with l -leucine as a template. The morphology and structure of the resultant materials were characterized by various analytical methods, such as X-ray diffraction, field emission scanning electron microscopy and UV–Vis diffuse reflectance spectra. The photocatalytic performance of Bi 2 WO 6 and Ag/Bi 2 WO 6 samples was evaluated by degrading organic dye and antibiotic in water under visible light irradiation. A series of results indicated that loaded Ag nanoparticles significantly improve the photocatalytic activity of Bi 2 WO 6 . In addition, the possible mechanism was proposed that the enhanced photocatalytic activity was resulted from the unique configuration of peony-like morphology that favorable for the adsorption of organic compounds and the high Schottky barriers between interface of Ag NPs and Bi 2 WO 6 , which promoted the transfer of photogenerated electrons from Bi 2 WO 6 to Ag NPs. Meanwhile, noble metal Ag can induce surface plasmon resonance leading to the better visible light absorption of Bi 2 WO 6 .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ru-zhou Miao,Yu-long Bao,Guang Yang,Ying-jie Sun,Xiao-jing Wang,Jun Zhao,Hui-ying Mu,Fa-tang Li
The simultaneous construction of efficient hydrogen evolution surfaces and the establishment of effective electron transport channels are crucial for improving the efficiency of photocatalytic hydrogen evolution reactions (PHERs). Molybdenum carbide materials are considered strong substitutes for Pt co-catalysts in PHERs because their electronic structure is similar to that of Pt. However, it is still challenging to enhance the kinetics of molybdenum carbide for hydrogen evolution reactions (HERs) while improving interface electron transport properties. In this study, low electronegativity heteroatoms P were introduced into metalloid MoC to adjust the overpotential of HERs while tuning the Schottky barrier between MoC and Zn 0.5 Cd 0.5 S. Due to the excellent charge separation efficiency in photocatalysts driven by the atomic-scale tuning of interfacial energetics on the prerequisite of not impairing the kinetics for surface reactions, the optimal P-MoC-modified Zn 0.5 Cd 0.5 S displayed a hydrogen evolution rate of 28.98 mmol·g −1 ·h −1 , which was 11.59 and 1.51 times higher than that of pure Zn 0.5 Cd 0.5 S and Pt-modified Zn 0.5 Cd 0.5 S, respectively. This study provides a reference for the design of a high-efficiency co-catalyst and provides a new way for the regulation of the Mott–Schottky barrier.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 18
·7583-7593
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IF 4.5
Dou Yun-Qi,Deng Tian-Song,Zhang Qi,Zhao Xiaoyu,Liu Jia,Cheng Zhiqun
In this study, we synthesized Au-Cu 2 O core–shell nanoparticles (Au@Cu 2 O NPs) with epitaxial Cu 2 O shell, which have highly improved catalytic performances in methyl orange reduction reaction. We have obtained Au@Cu 2 O NPs with different sizes at low temperatures by changing the amount of Cu 2+ precursor. Both Au and Cu 2 O are catalytic materials, especially Cu 2 O, as a p -type semiconductor, whose catalytic ability depends on the crystalline facets. Catalytic reduction of methyl orange (MO) was used as a model system to explore the catalytic properties of Au@Cu 2 O nanocomposite. In comparison to pure Au and Cu 2 O NPs, the catalytic performance of Au@Cu 2 O has a noticeable improvement. The best catalytic rate was ~ 22 times faster than that of AuNRs and ~ 4 times than that of Cu 2 O NPs. By studying the catalytic mechanism, it is supposed that the Schottky barrier at the Au-Cu 2 O interfaces leads to the charge separation, which is beneficial to catalysis. Therefore, the Au@Cu 2 O NPs we designed with controllable shell thickness is an ideal composite material in the catalyst domain.
研究领域:
纳米材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 23
·2201396
·
IF 10.05
Yuchao Wei,Chao Chen,Chong Tan,Le He,Zhengze Ren,Chaoyi Zhang,Silu Peng,Jiayue Han,Hongxi Zhou,Jun Wang
Owing to its suitable electronic bandgap, excellent air stability, and high carrier mobility at room temperature, low-dimensional bismuth oxyselenide (Bi 2 O 2 Se) has become attractive in the context of visible–near-infrared (VIS–NIR) detection. However, the high carrier concentration and bolometric effect of Bi 2 O 2 Se nanosheets are not conducive to reducing the dark current and improving the response speed, which hinders Bi 2 O 2 Se nanosheet-based photodetectors from achieving an optimal performance. In this study, a Bi 2 O 2 Se nanoribbon is controllably synthesized on a fluorophlogopite substrate by means of the chemical vapor deposition approach. Through the use of a Bi 2 O 2 Se nanoribbon structure and the application of a Schottky barrier between the Bi 2 O 2 Se and Au electrodes, a fast response and low noise photodetector is achieved. More specifically, the response times are 2.1 and 313 µs at 650 and 1550 nm, respectively, and the corresponding optimal detectivities are 3.28 × 10 13 and 8.07 × 10 9 Jones. Furthermore, the device reaches a −3 dB bandwidth of 81 kHz and exhibits a responsivity of 3.2 × 10 5 A W −1 at 650 nm under a bias of 5 V. This study provides new opportunities for the application of high-performance VIS–NIR photodetectors.
研究领域:
材料科学
·
光电探测
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yanping Zhu,Runliang Zhu,Gangqiang Zhu,Miaomiao Wang,Yannan Chen,Jianxi Zhu,Yunfei Xi,Hongping He
Nowadays, two-dimensional (2D) nanosheets, such as layered double hydroxides (LDH), have received considerable attention for their potential to meeting clean energy demand and solving environmental problems. In this work, novel and efficient photocatalysts of plasmonic Ag nanoparticles coated Zn/Ti-LDH nanosheets have been synthesized through low-temperature reduction method. The structural characteristics of the as-prepared products were investigated by a series of characteristic methods The scanning electron microscopy (SEM) and transmission electron microscope (TEM) images showed that Ag nanoparticles were distributed on the surface of Zn/Ti-LDH uniformly. The UV–vis diffuse reflectance spectra (DRS) showed that the absorbance of Ag/LDH in visible-light region enhanced markedly and presented a broad band at 500–600 nm, which was resulted from the surface plasmon resonance (SPR) effect of Ag nanoparticles. The photocatalytic activities of Ag/LDH were evaluated by degradation of Rhodamine-B (RhB) and NO. The photocatalytic experiments showed that Ag/LDH had higher photocatalytic activity than that of pure LDH , and 2%Ag/LDH exhibited the highest photocatalytic activity. In addition, the 2%Ag/LDH exhibited high photochemical stability after multiple reaction runs. The obtained results from photoluminescence (PL) spectroscopic measurement and transient photocurrent ( I – V ) analysis both revealed the existence of Schottky barriers between LDH and Ag nanoparticles. The electron spin resonance (ESR) showed that OH were the dominant active species in the photo-degradation process. The enhanced photocatalytic performance of the composite should be ascribed to both the SPR effect of Ag nanoparticles in visible light and the Schottky barriers between LDH and Ag nanoparticles.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）