NANO
·
2022
·
IF 1.438
Ming Gong,Zhong Wei,Xiaoqiang Cui
Preventing the high recombination rate of carriers in graphite-carbon nitride (GCN) is essential for hydrogen production. In this work, we break the original symmetry of GCN by embedding benzene ring for enhanced visible-light absorption and carriers transfer efficiency. The new catalyst was prepared by a condensation reaction using dicyandiamide and 5-amino-2,4,6-triiodoisophthalic acid as precursors. It shows photocatalytic hydrogen evolution rate of 690.74 μ mol g − 1 h − 1 , 9.3 times enhancement than the original GCN. This work provides a new strategy for designing efficient two-dimensional photocatalytic materials for water splitting.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 6
·3612-3622
·
IF 3.9
Yiyao Zhang,Hongchen Song,Jintai Han,Yunchao Liu,Jing Sun,Tingting Shen,Xikui Wang,Zhen Wang,Weizhen Zhang,Xuerui Yao
A Bi2WO6/BiVO4 composite photocatalytic material was synthesized by the hydrothermal method, and achieved the effective degradation of oxytetracycline (OTC) and tetracycline (TC) under visible light. The compositions, structures, chemical states and optoelectronic properties of Bi2WO6, BiVO4 and Bi2WO6/BiVO4 composites were characterized by systematic characterization. The results show that the existence of the heterojunction interface facilitates the separation of photogenerated carriers. Compared with the pure catalyst of Bi2WO6 and BiVO4, the Bi2WO6/BiVO4 composite material significantly improves the degradation efficiency of OTC and TC. The degradation rate is 6.22 and 3.02 times higher than that of Bi2WO6 and BiVO4, respectively. Through the free radical quenching experiments, it is known that photogenerated holes (h+) and superoxide anion free radicals (·O2−) are the main active substances in the degradation of OTC. By analyzing the process of photocatalytic degradation of OTC, there are mainly six intermediates during the process. Their possible degradation pathways are also inferred in this paper.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Guanglu Xia,Jianhao Qiu,Lu Zhang,Dingliang Dai,Jianfeng Yao
Photocatalytic H 2 O 2 production by reducing O 2 has drawn great interest, but most reactions were conducted in pure O 2 which requires extra energy input. Here, TpPa-1 was facilely decorated by ZnIn 2 S 4 nanosheets for H 2 O 2 production in ambient air under visible light . Profiting from the hierarchical heterostructure , efficient visible-light absorption and O 2 capture of ZnIn 2 S 4 /TpPa-1, an H 2 O 2 yield of 516 μmol·L −1 was obtained with 2 h irradiation, which is 3.0 and 3.9 times those of blank TpPa-1 and ZnIn 2 S 4 , respectively. The intimate interface contact between ZnIn 2 S 4 and TpPa-1 also contributes to the performance improvement. It is noted that the photocatalytic H 2 O 2 formation over ZnIn 2 S 4 /TpPa-1 hybrids experienced an indirect reduction of O 2 that ·O 2 - served as the key intermediate. Additionally, the reactions under different atmospheres and ethanol concentrations demonstrate that both O 2 and ethanol play important roles in the efficient evolution of H 2 O 2 . This work could enlighten the heterostructure construction and (photo)catalytic H 2 O 2 production based on covalent organic frameworks .
✓ 已验证
产品关联
DOI
高影响因子
Food Bioscience
·
2023
·
IF 5.2
Jingwen Zhu,Xue Xia,Foxin Zhang,Shiqing Song,Heping Cui,Khizar Hayat,Qiang Zhang,Xiaoming Zhang,Chi-Tang Ho
Light color and savory flavor are difficult to be integrated in ‘Thermal Process Flavoring’ through traditional Maillard reaction . A light-colored seasoning from gluten peptide-glucose system was prepared through gradient temperature-elevating Maillard reaction with extra-added l -cysteine. Greater saltiness and umami enhancement effect of Maillard reaction products (MRPs) were observed from weaker reaction, while lower temperature and longer heating time were conducive to yield kokumi-taste compounds. With the addition of l -cysteine, intensities of fluorescence and UV-VIS absorption of MRPs were weakened. An inhibition of browning and a decrease of α-dicarbonyls concentration caused by l -cysteine were observed. The addition of l -cysteine also led to an increase of peptides below 500 Da (from 53.27 mg/mL to 56.50 mg/mL) and a decrease of cross-linking products in 1–3 kDa, which accounted for superior umami and gentle kokumi attribute of the light-colored products compared with the MRPs without l -cysteine addition.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 48
·18234-18240
·
IF 8.067
Chuan-Jun Tang,Bo-Mei Liu,Lin Huang,Jing Wang,Qiang Tang
The rapid development of minimized near-infrared (NIR) phosphor-converted LEDs (pc-LEDs) has evoked a large demand for broadband NIR phosphors and will enable breakthrough NIR spectroscopy applications. Consequently, the search for NIR pc-LEDs which can emit in the NIR-II window (1000–1700 nm) has become increasingly urgent. Herein, an unprecedented long-wavelength NIR MgTi2O5:Ni2+ phosphor that exhibits broadband NIR emission covering 1200 to 1700 nm with a full width at half maximum (FWHM) of 245 nm is successfully synthesized. By combining the MgTi2O5:Ni2+ phosphor with an ultraviolet LED chip, a high-performance NIR pc-LED is fabricated, which has a NIR output power of 3.6 mW at 300 mA driving current. These results indicate that the fabricated NIR-II pc-LED device is a promising candidate as a broadband light source for NIR spectroscopy applications including night vision, high-penetrating imaging, and information restoration. For instance, the secret information covered by ink can be recovered with the aid of an NIR-II pc-LED. This work not only provides a new material that has great potential as a NIR light source, but also demonstrates a set of approaches to expand the application of NIR spectroscopy and imaging technology.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jie Zhang,Kang-Bo Yu,Jia-Min Wu,Chun-Sheng Ye,Wen Zheng,Heng Liu,Shi-Feng Wen,Chun-Ze Yan,Yu-Sheng Shi
SiO 2 -based ceramic cores are widely used in the preparation of gas turbine engine hollow blades due to their excellent chemical stability and easy removal after casting. In this paper, ZrSiO 4 reinforced SiO 2 -based ceramics were fabricated using digital light processing (DLP) technology. The results showed that the addition of ZrSiO 4 reduced the cure depth due to its high UV light absorptivity and refractive index . When the content of ZrSiO 4 increased to 15 wt%, the cristobalite content reached the maximum, and radial shrinkage reached the minimum of 1.4%. ZrSiO 4 grains could hinder the propagation of cracks, enhancing the room-temperature flexural strength . At 1550 °C, fracturing across SiO 2 grains in SiO 2 -based ceramics led to the great improvement of high-temperature flexural strength. When the content of ZrSiO 4 reached 15 wt%, the flexural strength at room temperature and high temperature was 11.5 MPa and 36.7 MPa, respectively. Therefore, the SiO 2 -based ceramics prepared using DLP technology have good room temperature and high temperature properties, and are expected to be used for hollow blade casting.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 47
·22639-22649
·
IF 3.925
Doudou Wang,Haiyan Zhang,Ye Zhang,Zhixuan Huang,Lili Li
The design of organic photocatalysts with visible-light-response is an important way to solve energy crisis and environmental pollution. Polypyrrole (PPy) as one of the conjugated polymers is a prospective photocatalyst material due to its excellent optical properties, easy synthesis and high environmental stability. In this work, polyacrylonitrile (PAN) and g-C3N4 were electrospun as a fiber membrane matrix. PPy was coated on the matrix by in situ polymerization of a pyrrole monomer using doped Fe3+ as an oxidant. PPy exhibited a broadband visible light absorption region and a narrow band gap which was conducive to improve visible light utilization. The separation efficiency of photogenerated e−–h+ pairs was improved by constructing a heterojunction between PPy and g-C3N4. The doping of Fe3+ as an electron scavenger further prevented the recombination of carriers. The PAN/g-C3N4-PPy-Fe3+ membrane showed highly efficient removal performance for both cationic and anionic dyes. Moreover, PAN/g-C3N4-PPy-Fe3+ exhibited excellent recyclability and stability. This work outlined an approach for designing a novel conjugated polymer based multi-component composite photocatalyst with visible light response.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 18
·2211830
·
IF 19
Kwan Ho Ngai,Xinwen Sun,Yinping Wang,Long Lin,Zefeng Chen,Qi Wei,Mingjie Li,Chuhao Luan,Wenjun Zhang,Jianbin Xu,Mingzhu Long
The delicate engineering of monovalent cations in perovskite material has led to continuous performance breakthroughs and stability improvement for the perovskite light-emitting diodes (PeLEDs). However, the exact role of A-site cations on the electroluminescence (EL) performance and degradation mechanism of PeLEDs has not been systematically answered yet. Herein, it is demonstrated that the most commonly used methylammonium cation (MA + ) has an adverse effect on the electrochemical reaction at the interface between perovskite and metal-oxide layer, leading to deteriorated EL performance as compared to that of the formamidinium cation (FA + )-based perovskite. It reveals that the accelerated deprotonation process of MA + under an electric field will aggravate the reaction between iodide and metal ion in oxide layer. The further substitution of a small portion of FA + with inorganic cesium cation (Cs + ) results in much enhanced crystallinity and enlarged crystal size, leading to an optimized peak external quantum efficiency of 21.3%. The ion migration process in the PeLEDs can be significantly suppressed with Cs + incorporation, leading to a smaller roll-off under large current density and an elongated half-lifetime of 190.1 h under a current density of 20 mA cm -2 , representing one of the most stable PeLEDs based on 3D perovskite layer.
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 5
·1501-1511
·
IF 5
You Zi,Songrui Wei,Zhihui Huang,Jun Zhu,Yi Hu,Mengke Wang,Han Zhang,Weichun Huang
Organophosphorus compounds display excellent chemical and biological properties that the S–P(O) bonds afford utility in various fields. Herein, we report for the first time on the utilization of zero-dimensional (0D) monoelemental bismuth (Bi) quantum dots (QDs) as photocatalysts for direct dehydrogenative phosphonylation under visible light irradiation. A tiny amount of 0D Bi QDs (1.5 mol%) show high photocatalytic efficiency in the direct formation of S–P(O) between thiols and H–P(O) compounds under visible light with simple protocol, amenable gram-scale synthesis and good reusability. The mechanism study and density functional theory (DFT) calculation demonstrate the sulfide radial generated on the surface of 0D Bi QDs. The DFT study also indicates that the as-synthesized 0D Bi QDs exhibit suitable adsorption energy and sufficient charge transfer to effectively promote phosphonylation. We believe that such unique transformation can pave the way to more sustainable organic photocatalytic transformations based on high-efficiency QDs or QD-related nanocomposites.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Junfeng Yang,Yuyang Wu,Yanhui Dong,Hao Cui,Chenyang Shi,Hang Sun,Shengyan Yin
Herein, a ternary Bi@H-TiO 2 /B-C 3 N 4 type II heterostructure is successfully designed and prepared via metal Bi as cocatalyst for photocatalytic H 2 generation. As expected, under λ > 300 nm light, the highest photocatalytic hydrogen production rate (HPR) of Bi@H-TiO 2 /B-C 3 N 4 is up to 223.08 μmol g −1 h −1 . Excitingly, under visible light (λ > 400 nm), the highest HPR of Bi@H-TiO 2 /B-C 3 N 4 is increased to 18.84 μmol g −1 h −1 , which is about 67.3 times, 37.7 times and 6.8 times as high as that of H-TiO 2 , B-C 3 N 4 and H-TiO 2 /B-C 3 N 4 under the same conditions, respectively. Moreover, the electrochemical impedance spectroscopy and transient photocurrent tests manifest that the interface resistance of Bi@H-TiO 2 /B-C 3 N 4 composite decreases and the photocurrent density increases after loading metal Bi. These results indicate that loading metal Bi as cocatalyst (providing more electron trapping sites) is beneficial to improve photocatalytic activity in the type II heterostructure composite. And the electron transfer directions (B-C 3 N 4 → H-TiO 2 → Bi or B-C 3 N 4 → Bi) are proved by ultraviolet photoelectron spectroscopy test. Therefore, the Bi@H-TiO 2 /B-C 3 N 4 photocatalyst with strong visible light absorption is expected to be a promising candidate in photocatalytic fields under visible light.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Junqing Chen,Zhaodong Zhu,Hui Zhang,Shiyu Fu
Response actuators based on different stimuli such as light, humidity and temperature have attracted extensive attention due to their advantages in various environments. In this work, a facile top-down strategy is proposed to prepare a light stimuli-responsive self-densified wood film. We constructed a sandwich-like structure by in-situ co-precipitation of Fe 3 O 4 , spraying CNT, self-densification and chemical vapor deposition methyltrimethoxysilane (MTMS) on TEMPO-oxidized delignified wood. The CNT/Fe 3 O 4 /MTMS wood film exhibits excellent strength (56 Mpa along the fiber direction), superhydrophobicity (water contact angle of 151°) and photothermal conversion performance. The Fe 3 O 4 in the film plays a good role of photothermal conversion, which makes the photothermal conversion effect of the film double that of the wood film sprayed only with CNT. Under near-infrared (NIR) light irradiation and focused sunlight, the film exhibits a light-driven response of linear motion on the water surface. Based on the excellent electrical conductivity and light stimulus responsiveness of the film under NIR irradiation, an electrical switch is successfully designed and can be remotely controlled. Moreover, the film is easy to recycle due to magnetism , it is also very stable under moisture environment due to the protection of the superhydrophobic coating and the dense structure created by self-densification.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 9
·3387-3395
·
IF 8.067
Yuqing Song,Xiaobao Xu,Yuanzhou Zhang,Zeyao Han,Jiaxin Liu,Junyu Li,Yousheng Zou
As an artificial perception system, a neuromorphic vision sensing system can imitate the complex image sensing and processing functions of a human visual neural network. In order to simulate the nervous system, people often need to integrate multiple functional components such as sensors and processors into a sophisticated circuit system or prepare a multi-functional optoelectronic device through a complex and tedious process. The high cost and complicated preparation process will undoubtedly limit the future development of a neuromorphic vision system. Herein, we show a perovskite-based transformational photodetector that can mimic image sensing and preprocessing functions in a vision system. The pristine photodetector is prepared by a simple one-step method and has an on–off ratio of ∼107, a low noise current of ∼4.27 × 10−13 A Hz−0.5, a −3 dB bandwidth of 185 kHz, and a specific detectivity of 3.48 × 1011 Jones. Then, we utilize the reversible interaction between NH3 and MAPbI3, and adjust irradiation to induce dynamic transformation of the perovskite, so that the photocurrent of the photodetector exhibits enhanced behavior of short-term synaptic plasticity over time. The photocurrent with 3.36 mW light intensity shows ∼225% enhancement after 60 pulses, while the photocurrent with 0.48 mW light intensity shows ∼178% enhancement, which can enhance the contrast of the transmitted image and realize the image transmission and preprocessing functions of a neuromorphic vision sensing system. We believe that this work will provide new potential for the future application of photodetectors in neuromorphic vision sensing.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）