INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jiashun Zhou,Haifeng Zhu,Renjie Ding,Huihua Luo,Lianqing Yu,Yaping Zhang
The core-shell structure photocatalysts have attracted extensive attention in photocatalysis due to large contact area, multiple reaction sites and high photocatalytic performance. Herein, a series of Mn 0.5 Cd 0.5 S@CuPc nano core-shell composites photocatalyst were successfully synthesized by facile solution method. The results showed that the as-prepared Mn 0.5 Cd 0.5 S photocatalyst hydrogen evolution was only 0.40 mmol/g·h, while Mn 0.5 Cd 0.5 S@CuPc composites show strong light absorption from 600 nm to 800 nm and high catalytic performance compared with pure Mn 0.5 Cd 0.5 S. Notably, the hydrogen evolution of Mn 0.5 Cd 0.5 S @CuPc-5% reached up to 2.14 mmol/(g·h), representing a remarkable 5.35 times improvement compared to the pure Mn 0.5 Cd 0.5 S when the optimal loading capacity of CuPc was set at 5%. The Mn 0.5 Cd 0.5 S@CuPc-5% exhibits excellent photocatalytic performance can be attributed to the CuPc forms a uniform molecular film on the surface of Mn 0.5 Cd 0.5 S, and the close contact between Mn 0.5 Cd 0.5 S and CuPc which can effectively promote the transfer and separation of photo-generated carriers. Moreover, the 5% Mn 0.5 Cd 0.5 S@CuPc nano core-shell composites have excellent stability, photocatalyst hydrogen activity reduce was approximately 20.1% after four runs for 12 h. This nano core-shell structure photocatalyst research offers a new strategy for constructing organic-inorganic nanocomposite photocatalysts .
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Zizheng Ai,Gang Zhao,Yueyao Zhong,Yongliang Shao,Baibiao Huang,Yongzhong Wu,Xiaopeng Hao
CdS is a photocatalyst known for its desirable bandgap and availability but it is limited by photocorrosion and inefficiency issues in practical applications. According to band engineering theory, regulating the width of bonding region that exists between cubic phase and hexagonal phase, we design a suitable phase junction and achieve effective separation of electron-hole pairs. Thus, the problems caused by photocorrosion and phase exclusion can be resolved. The optimal photocatalytic activity of the prepared material is 4.9 mmol h −1 g −1 with 41.5% quantum efficiency at the wavelength of 420 nm, which is 60 times higher than that of the initial samples (cubic or hexagonal phase), and keeps high photocatalytic stability. This novel construction approach can be useful in designing ideal band structures and matching the phase bandgap of other binary sulfides.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2018
·
IF 2.687
Qifeng Liu,Bingrui Liu,Qian Zhang,Jianping Gao,Jingjun Ma
High-efficiency hydrogen evolution is obtained from a novel fluorescein homogeneous system, comprising a noble metal free fluorescein as the photosensitizer, Pt nanoparticle as the cocatalyst and TEOA as the holes scavenger in an aqueous solution under visible light irradiation. The highest H 2 production rate is 491.40 μmol/h (λ > 420 nm) and quantum efficiencies of our system are among the highest reported for the molecular hydrogen systems in the visible light range. Unlike many reported molecular hydrogen systems are either unstable under illumination and expensive, or have weak photocatalytic performances, our low-cost system exhibits excellent activity and endurance. We believe that this low-cost, high-efficiency and durable homogeneous system for molecular hydrogen may result in new breakthroughs for the hydrogen energy and solar energy utilization.
研究领域:
能源科学
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光化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Yuping Che,Bingxin Lu,Huaxiang Chen,Jin Zhai,Kefeng Wang,Huaiqiu Chang,Zhaoyue Liu
Adding a cocatalyst to a semiconductor catalyst is often considered an effective measure to increase the efficiency of the photocatalytic hydrogen evolution reaction. Nowadays, noble metals are the state-of-the-art cocatalysts for the hydrogen evolution reaction. Due to their high cost and scarcity, it is imperative to develop cocatalysts prepared from cheap and abundant elements. Here, RuSe2 was used as an effective substitute for precious metal promoters such as Pt to enhance the efficiency of g-C3N4 for the hydrogen evolution reaction. A high efficiency of 13417.3 μmol·g–1·h–1 was obtained. It was 214 times higher than that of g-C3N4 and 2.8 times higher than that of 3%Pt/g-C3N4. Density functional theory calculations were performed. The (210) and (200) crystal faces of RuSe2 showed lower ΔGH* than Pt(111), indicating higher hydrogen evolution efficiency. Compared with the Pt cocatalyst, metallic RuSe2 cocatalysts exhibited superior performance. Meanwhile, the electrocatalytic activity was also investigated in an alkaline medium. It showed a decent electrocatalytic activity and high stability. These findings might provide a prototype to develop cheap and efficient cocatalysts for large-scale water splitting.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Shuo Zhao,Chao Zhang,Yanyun Wang,Kai Zhao,Yuming Zhou,Lu Li,Shuping Zhuo
Carbon doping is a promising strategy to enhance the catalytic performance of carbon nitride . Herein, a microtube-shaped carbon doped carbon nitride photocatalyst with increased π-electron density is developed, which is successfully applied in water splitting under visible light irradiation. The special tubular texture and the effective π delocalization caused by carbon doping largely broaden the light absorption range, boost the separation and transfer of charge carriers. The hydrogen evolution rate of carbon doped carbon nitride is enhanced by 3.1 times than that of the pure carbon nitride. And the experimental calculations and density functional theory indicate that carbon doping plays a critical role in improving catalytic performance owing to the increased π-electron densities. The unique tubular texture provides the improved surface area and numerous active sites for carbon nitride, which benefits the adsorption of reactant molecules and improves structural stability. Meanwhile, carbon doping can control electron density, adjust the band structure to accelerate charge carrier transfer and separation rate, and finally enhance the H 2 generation rate. This work sheds light on the development of carbon nitride-based photocatalysts with a high H 2 generation rate.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yilei Li,Qing Zhao,Yang Zhang,Yunchao Li,Louzhen Fan,Fa-tang Li,Xiaohong Li
Photocatalysis has been facing challenging problems especially the inefficient photocarriers transfer at the interfaces. Here, based on K sp difference, we prepare the sequential heterojunction of CoS/CdS/CuS via sequential cation exchange strategy, and propose the concept of "electron-welcome zone", where the point-to-point contact can be formed at the interface, thus providing continuous electron transport channels. HAADF-STEM EDS line test indicates the formation of designed structures, and the p/n junction is confirmed by band structure and Mott-Schottky analysis. Theoretical calculation indicates that CoS reduces the Gibbs free energy of the reaction. TRPL spectra show that the existence of "electron welcome zone" greatly improves the lifetime of electrons. This sequential structure enable the optimal H 2 production rate to reach 123.2 mmol g −1 h −1 with AQE of 45.6%, which is among the highest values of CdS-based photocatalysts. This work opens new way to efficient photogenerated carrier transfer channel for solar-energy conversion.
研究领域:
材料科学
·
能源化学
·
催化作用
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Hongxia Zhang,Yahang Mou,Shuhua Liu,Dezhi Han,Fang Wang,Liancheng Bing,Guangjian Wang
Efficient and controllable hydrogen release from ammonia borane (NH 3 BH 3 , AB) hydrolysis is a secure and effective way to generate hydrogen on-demand. The development of high-efficiency and low-cost catalysts is of important but still remains a great challenge. Herein, uniformly dispersed NiPCeO x nanoparticles (NPs) with narrow size distribution supported on mesoporous MCM-41 were prepared by incipient wetness impregnation followed by NaBH 4 reduction. Attributing to the ordered mesoporous structure of the support as well as the efficiently enhancement of electron density on the Ni active sites brought by the electron transfers , the NiPCeO x /MCM-41 catalyst exhibits exceptional catalytic performance towards AB hydrolysis with a high turnover frequency (TOF) value of 47.3 mol H2 (mol Ni ·min) −1 at 298 K and a low apparent activation energy ( Ea ) of 35.86 kJ mol −1 . Furthermore, the NiPCeO x /MCM-41 catalyst shows excellent durability with 76.5% of the initial TOF value remained after five cycles.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Qi Li,Pengcheng Wu,Yufan Huang,Peng Chen,Keliang Wu,Jianning Wu,Yan Luo,Lele Wang,Shengchao Yang,Zhiyong Liu,Xuhong Guo
Traditional surface-to-surface contact heterojunctions suffer from poor stability and low electron-hole separation efficiency, which has become a crucial limiting the further improvement of photocatalytic property. Therefore, improving the combination of heterogeneous materials will become a new attempt. In this work, a novel lattice embedded ZnO@TiO 2 (B) nanoflowers was prepared by combining electrodeposition method combined with hot solvent method. The hetero interface of the ZnO@TiO 2 (B) nanoflowers is distributed in the phase of TiO 2 (B), which drives high-efficiency charge separation. The sample Zn:Ti 1:4 has the highest photocatalytic property, and the H 2 generation efficiency under the full spectrum is 1.695 mmol g −1 h −1 , which is 3.5 times that of TiO 2 (B). After 36 h cycle stability test, its stability is as high as 90%. According to results, the possible mechanism of ZnO@TiO 2 (B) photocatalytic hydrogen production is proposed. These findings may provide new strategies for the preparation of high-efficiency heterojunction photocatalysts with special structures.
研究领域:
材料科学
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光催化
·
纳米材料
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能源化学
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半导体物理
·
环境功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 27
·1-14
·
IF 2.8
Kavitha T.,Renukadevi S.,Veerasamy R.
The hydrothermal approach was used to synthesise a composite photocatalyst of Ag 2 WO 4 /g-C 3 N 4 . This photocatalyst proved effective in preventing Escherichia coli ( E. coli ) when exposed to visible light. Imaging microscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N 2 adsorption–desorption analysis, UV–Vis diffuse reflectance spectra (DRS), and photoluminescence (PL) were among the many methods used to comprehensively characterize the photocatalysts’ physicochemical characteristics. In comparison to pure g-C 3 N 4 and Ag 2 WO 4 under visible light, the produced photocatalysts demonstrated significantly improved photocatalytic cleaning efficiency. In addition, under visible light irradiation for 60 min, a mixture of 5 percent Ag 2 WO 4 and 100 milligrammes of g-C 3 N 4 was able to entirely kill many live bacteria. The ideal mass ratio for this combination was 5 weight percent. By working in tandem, g-C 3 N 4 and Ag 2 WO 4 increase the separation rate of photogenerated electron–hole pairs and ensure that Ag 2 WO 4 particles are evenly distributed over the g-C 3 N 4 surface, leading to a high disinfection efficiency. These hybrids outperform pure g-C 3 N 4 in the visible range when it comes to the efficiency of hydrogen evolution (3761.1 µmol h −1 g −1 ). A higher degree of photocatalytic activity may be achieved in the composite Ag 2 WO 4 /g-C 3 N 4 photocatalyst through boosting the spacing of charge carriers produced by photons in the two photocatalysts.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yu Liang,Wei Li,Xuan Wang,Run Zhou,Hao Ding
TiO 2 –ZnO/Au ternary heterojunction nanocomposite was fabricated by producing TiO 2 nanosheets first using solvent-thermal method followed by Au deposition and ZnO deposition respectively. The TiO 2 nanosheets provide a relatively large surface area for the good dispersion of ZnO nanoparticles and Au particles and sufficient contact with the medium, which contribute to the excellent photocatalytic performances of TiO 2 –ZnO/Au heterojunction composite. The phases and structures, morphologies, surface and optical properties of the ternary heterojunction composite are well-characterized. Subsequently, the photocatalytic hydrogen generation of TiO 2 –ZnO/Au is evaluated under visible light irradiation. TiO 2 –ZnO/Au ternary heterojunction composite has efficient light absorption ability and excellent performances in photocatalytic hydrogen generation (1068 μmol/g under the irradiation of visible light for 4 h) and antibacterial properties (reaching 98.2%). TiO 2 –ZnO/Au ternary heterojunction nanocomposite has a large potential to be used in areas such as interior wall coating.
研究领域:
材料科学
·
环境科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2023
·Vol. 7
·期 12
·2300188
·
IF 7.9
Yichao Wang,Zipeng Xing,Chunxu Wu,Meijie Liu,Jiapeng Gao,Na Zhang,Zhenzi Li,Haixia Liu,Wei Zhou
The development of heterojunction composite photocatalysts with sophisticated charge transfer mechanisms and interfaces is a promising approach to enhance photocatalytic efficiency. Herein, for the first time, a peanut-like Zn 0.5 Cd 0.5 S/BiVO 4 S-scheme heterostructure visible-light composite photocatalyst via a two-step hydrothermal method is synthesized. S-scheme heterostructures, which can maintain the maximum redox capacity in the conduction and valence bands of the catalyst, have been established as an effective charge transfer mode in the field of photocatalysis. The Zn 0.5 Cd 0.5 S/BiVO 4 heterojunction photocatalyst exhibits 99.52% degradation efficiency for tetracycline-based organic pollutants under visible light irradiation. In addition, the photocatalytic hydrogen production efficiency of the composite catalyst is as high as 8969.58 μmol g −1 h −1 , which is 69.24 and 4.35 times higher than that of single BiVO 4 and Zn 0.5 Cd 0.5 S, respectively. Through density functional theory calculations and experimental studies, the material conformed to the charge transfer mode of the S-scheme heterojunction is determined. The improved photocatalytic efficiency can be attributed to the formation of S-scheme heterogeneous interface, which bends the energy band at the interfacial contact, and the formation of an internal electric field, which hinders rapid charge recombination and prolongs the lifetime of charge carriers.
研究领域:
材料科学
·
光催化技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Yating Ai,Jiajie Hu,Xianqiang Xiong,Sónia A.C. Carabineiro,Yuesheng Li,Nikolay Sirotkin,Alexander Agafonov,Kangle Lv
Efficient interfacial charge transfer and robust interface interactions are crucial to achieve superior spatial separation of carriers and develop advanced heterogeneous photocatalysts . This study describes the synthesis of a novel S-scheme heterojunction of ZnO/In 2 S 3 , with S−O covalent bonds , achieved through a hydrothermal method . The optimized heterojunction shows exceptional photocatalytic activity , achieving a H 2 generation rate of 2488 μmol g −1 h −1 and a degradation efficiency of 86 % for tetracycline hydrochloride (TCH) within 2 h. These values surpass those of In 2 S 3 alone by 35 and 1.4 times, respectively. Various techniques, including electron spin resonance, X-ray photoelectron spectroscopy, Kelvin probe force microscopy and density functional theory calculations confirm the S-scheme heterojunction. The establishment of a chemical S−O bond between In 2 S 3 and ZnO facilitates an atomic level interfacial pathway, enabling efficient transportation of interfacial electrons.
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）