APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Min Zhang,Jiacheng Yao,Muhammad Arif,Bo Qiu,Hongfei Yin,Xiaoheng Liu,Shen-ming Chen
The electronic transmission mode can effectively influence the photogenerated electron-hole separation efficiency, which further influence the photocatalytic hydrogen production performance. Herein, we synthesized a CeO 2 /ZnIn 2 S 4 composite photocatalyst having a 0D/2D heterojunction by facile solvothermal and room temperature precipitation methods. The successful construction of the heterojunction was demonstrated by XRD and XPS. Meanwhile, the interesting findings shows that the 0D “chess” CeO 2 compounded on the 2D “checkerboard” ZnIn 2 S 4 in SEM and TEM. The ESR test of O 2 − and OH demonstrates the photocatalytic mechanism of Z-scheme electron transport in the catalyst. The highest hydrogen production rate of the catalyst reaches 847.42 μmol·g −1 ·h −1 . This work provides a simple and effective strategy to achieve a rationally design photocatalyst for efficient, stable and cost-effective solar hydrogen production applications.
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DOI
高影响因子
Materials Chemistry Frontiers
·
2020
·Vol. 5
·期 2
·937-943
·
IF 6.788
Xupeng Gao,Xinyu Shen,Dingke Xue,Xin Li,Po Lu,Min Lu,Chunyan Li,William W. Yu,Xue Bai
Two-dimensional (2D) perovskites have become a research hotspot due to their large exciton binding energy and excellent stability. However, it is difficult to achieve longer wavelength emission than blue and green light in the 2D perovskites owing to their wide band gap resulting from their strong quantum confinement. Herein, we demonstrate a simple, efficient and low energy consumption crystallization method at room temperature to synthesize Mn2+ ion doped 2D (PEA)2PbBr4 nanocrystals (NCs) with dual-color emission centered at 410 nm from the exciton transition of the host and 600 nm from the d–d transition of Mn2+ ions. The periodic XRD peaks prove the formation of 2D perovskites. It is reassuring that the high PLQY of 54% has been achieved in the Mn2+ ion doped 2D (PEA)2PbBr4 NCs. The temperature-dependent and time-resolved spectra illustrate the efficient energy transfer from excitons to Mn2+ dopant ions. The realization of white LEDs with different color temperatures presents an opportunity and prospect for Mn2+ ion doped 2D perovskites in LED application.
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高影响因子
Frontiers in Environmental Science
·
2023
·
IF 4.6
Gan Xinhong,Song Yang,Liu Guoqiang,Zhang Huijuan,Yang Jianhua
We hydrothermally synthesized a flower-shaped ZnO/ZnIn2S4(ZnO/ZIS) Z-scheme heterojunction, which could decompose antibiotics efficiently. Meanwhile, the photocatalysts degradation of sulfamethoxazole (SMX) as the representative pollutant by ZnO/ZIS were studied deeply. When irradiated by a xenon lamp (500 W), ZnO/ZIS (0.20 g/L) degraded SMX (2.5 mg/L) in 6.5 h with an efficiency of 74.9%. The O2− and h+ played key roles in the visible light-assisted decomposition of SMX by ZnO/ZIS, while the role of OH was supplementary. Additionally, we investigated the mechanism of the generation of active species environmentally persistent free radicals (PFRs) within the SMX degradation using ZnO/ZIS by performing computations and experimental analyses based on density functional theory. Besides, PFRs (predominantly oxygen-centered) generated during the visible light-assisted SMX degradation by ZnO/ZIS had a concentration of 1011 spin/mm3. The generation of PFRs involves two major events, i.e., chemical adsorption and electron transfer. To adsorb the precursor F9a on ZnO, the energy required was −2.03 eV, and the electrons were transferred to the ZnO/ZnIn2S4 heterojunction from the precursor F9a. The PFRs only had minor negative impacts on the SMX degradation through ZnO/ZIS.
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2023
·Vol. 41
·期 11
·1786-1795
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IF 4.3
Yu Tian-Xin,Liu Ya-Yuan,Tian Fu-Yue,Ning Nan-Ying,Yu Bing,Tian Ming
3D printing silicone elastomer has demonstrated great potential in diverse areas such as medical devices, flexible electronics and soft robotics. It is of great value to investigate how to improve the mechanical properties, including tensile strength and elongation at break of printed parts. In this work, a light curing system that can be applied in silicone elastomer 3D printing is explored, which is composed of vinyl terminated polysiloxane as the macromer and thiol containing polysiloxane as the crosslinking agent, and a chain extension reaction is also introduced into this light curing system via the addition of the chain extender dithiol molecules, and a light curing system accompanied with chain extension is designed and realized based on the thiol-ene click reaction mechanism. After reinforced with silica fillers, the obtained light curing system can endow the light curing silicone elastomer with better mechanical properties under the condition of a lower viscosity of the precursor, the tensile strength and elongation at break can reach 525.5 kPa and 601%, respectively. This light curing system provides a feasible method to solve the contradiction between the viscosity of the precursor and the mechanical properties of the light curing elastomer in the digital light processing (DLP) 3D printing field.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Shutao Li,Pengfei Wang,Haoxu Zhao,Rendong Wang,Ruisen Jing,Zilin Meng,Wenzhi Li,Zhilei Zhang,Yunyan Liu,Qian Zhang,Zhao Li
The novel photocatalyst capable of utilizing the full spectrum of solar energy has attracted the attention of researchers. Black phosphorus (BP), as a rising star in an assortment of 2D materials , possesses a broadband absorption due to its tunable direct bandgap, which makes it a candidate photocatalyst. In our work, poly dimethyldiallyl ammonium chloride (PDDA) is used to passivate BP nanosheets (BPNs) to improve its stability. Further, the functionalized BPNs and BiOBr are combined by a one-step co-precipitation method to form nanocomposites . The successful formation of nanocomposites obviously promoted the possibilities for the carrier transporting between BiOBr and BPNs, and effectively hindered the recombination of carriers, which is confirmed by all manner of characterization. Meanwhile, nanocomposites have enhanced light absorption and relatively large specific surface area , which also has a gain in its photocatalytic activity. The as-prepared nanocomposite photocatalysts significantly enhanced the photocatalytic activity with the best degradation effect of 14 and 3.4 times than pure BiOBr towards degradation of methylene orange (MO) and ciprofloxacin (CIP), respectively, under visible light . To get clear proofs of the photocatalytic mechanism, the UV–vis diffuse reflectance spectroscopy, photocurrents , electrochemical impedance spectra and Mott-Schottky measurements et al. were employed and the type-I band alignment was proposed. This finding provides an easily synthesis and effective way of BP/semiconductor photocatalysts and demonstrates a new perspective for designing novel solar light driven photocatalysts.
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高影响因子
iScience
·
2023
·
IF 5.8
Chengcheng Suo,Wei Li,Sha Luo,Chunhui Ma,Shouxin Liu
Summary Photocatalytic depolymerization is a high value-added approach for utilization of lignin. In this study, magnetic microspheres of FeCoRu@SiO 2 –TiO 2 were synthesized by a co-precipitation method. Doping with CoO x and RuO x was used to improve the response to visible light, and doping with TiO 2 was used to improve the response to ultraviolet light ( λ < 380 nm). The lignin model compound depolymerization rate was >90%. The electron paramagnetic resonance results showed that the reaction occurred in two steps (aerobic phase and oxygen-free phase). Most of the O 2 − was produced in the first step by cleavage of C-O bonds. The second step was inhibited in an oxygen-free atmosphere. This research provides a valid method for enhancing the photocatalytic properties using full-spectrum light and exploring the lignin photocatalytic depolymerization mechanism. Further research is required to develop the catalyst properties and performance to produce radicals.
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高影响因子
Soft Matter
·
2022
·Vol. 18
·期 41
·8017-8023
·
IF 4.046
Shilin Yang,Bo Liao,Enxiang Liang,Shoujun Yi,Qing Liao
A novel type of aggregation-induced emission (AIE) nanoparticles, which are carbon dots (CDs) grafted with block polymer of tetraphenylethylene, spiropyran and N-isopropylacrylamide (CD-g-poly((TPE-co-SPA)-block-NIPAM)), was synthesized. The CD-g-poly((TPE-co-SPA)-block-NIPAM) nanoparticles can emit weak cyan fluorescence in tetrahydrofuran, while showing AIE-enhanced cyan fluorescence in water and solid film. The fluorescence of the CD-g-poly((TPE-co-SPA)-block-NIPAM) nanoparticles can reversibly transform cyan to red with UV/visible light irradiation, and functioned as a reversible fluorescence photoswitch. Importantly, the CD-g-poly((TPE-co-SPA)-block-NIPAM) nanoparticles have low cytotoxicity and, therefore, can be used for imaging in living cells.
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高影响因子
Advanced Optical Materials
·
2020
·Vol. 8
·期 23
·2001073
·
IF 8.286
Junnan Li,Xuechun Wang,Yeshu Tan,Dong Liang,Yatao Zou,Lei Cai,Tian Wu,Kaichuan Wen,Yusheng Wang,Yajuan Li,Tao Song,Lu Wang,Baoquan Sun
Halide perovskites are promising emitters for light-emitting diodes (LEDs) due to their outstanding optoelectronic properties, i.e., tunable bandgap, high photoluminescence quantum efficiency, and excellent color purity. However, in contrast to their green and red cousins, the present blue perovskite LEDs are still suffering from poor operational lifetime and electroluminescence shift during bias operation, hindering their practical applications in full-color information displays. Developing rational strategies to achieve efficient and stable blue perovskite LEDs is one of the urgent tasks in this community. Herein, through substituting the Pb site with strontium ions, blue perovskite films with stable emission under relatively harsh working conditions, i.e., high electrical bias, constant thermal heating, and UV illumination, are obtained, which accordingly guarantees spectrally stable blue perovskite LEDs with external quantum efficiency of 4.1%. Moreover, different alkaline-earth metal ions are also investigated to further explore the effects of B-site ion substitution on the performance of perovskite LEDs. This work demonstrates an alternative path for the development of spectral-stable blue perovskite LEDs.
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高影响因子
Matter
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2020
·
IF 0
Zizheng Fang,Huijie Song,Yue Zhang,Binjie Jin,Jingjun Wu,Qian Zhao,Tao Xie
Summary Advanced multifunctional devices increasingly rely on challenging complex shapes for their functions. 3D printing offers a solution but is often limited by the fabrication speed and/or material diversity. 4D printing based on digitally controlled 2D-to-3D transformation is advantageous in speed, but the accessible shapes are limited and integration of multiple materials is difficult. We report herein a concept that significantly extends the technological scope by combining 4D printing with modular assembly. Specifically, 4D photo-printed structures based on dynamically crosslinked polymers can be assembled in a modular fashion by interfacial bond exchange. Complex 3D objects with tailorable multiple materials can consequently be produced. This allows the fabrication of sophisticated shape-memory devices including a 3D Miura-patterned structure with zero Poisson's ratio and a Kresling-patterned cylindrical structure with superior mechanical stability. Our approach extends the possibilities for the future development of multifunctional devices with seamless integration of material, structure, and function.
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DOI
ChemCatChem
·
2018
·Vol. 11
·期 3
·1069-1075
·
IF 4.674
Rui Tong,Zhi Sun,Xiongwei Zhong,Xina Wang,Jincheng Xu,Ye Yang,Baomin Xu,Shuangpeng Wang,Hui Pan
Graphical Photocatalytic hydrogen production : g-C 3 N 4 /CeCO 3 OH/CeO 2 ternary composite showed greatly enhanced photocatalytic performance for hydrogen production under visible light irradiation. Promoting the separation of photo-generated carriers is significantly important to improve the efficiency of photocatalytic hydrogen production. Therefore, we prepared g-C 3 N 4 /CeCO 3 OH/CeO 2 (CeCeCN) ternary nanocomposite via an easy synthetic way using g-C 3 N 4 and CeO 2 as reactants. A CeCO 3 OH layer was formed and resulted in the novel ternary photocatalyst. The CeCeCN composite shows superior photocatalytic (PC) H 2 generation performance in sunlight excitation. The H 2 evolution rate is about 764 μmol h −1 g −1 , which is over 11 times larger than those of g-C 3 N 4 and CeO 2 . Compared with g-C 3 N 4 and CeO 2 , CeCeCN further shows a larger photo-response current density and a lower charge-transfer resistance. The remarkably increased photocatalytic property of CeCeCN is because of the efficient charge migration induced by the formed heterojunction. Our findings demonstrate that building multi-heterostructures can liberate more excited electrons for efficient hydrogen production under sunlight.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Shu Li,Haoran Wang,Gaohao Sun,Fengyang Zhao,Hui Yang,Guijiang Li,Xia Kong,Qingyun Liu
Rational design of efficient and durable non-precious metal electrocatalysts for methanol oxidation reaction (MOR) is a challenge of current research. In this work, the photosensitive organic molecule 5,10,15,20-tetrakis (4-carboxyphenyl) porphyrin (TCPP) has been used to modify nickel cobaltite (NiCo 2 O 4 ) nanomaterials . Under visible light irradiation , its catalytic performance for MOR is better than that of pure NiCo 2 O 4 . The photoelectrocatalytic mechanism of TCPP/NiCo 2 O 4 is attributed to the effective inhibition of photoelectron and hole recombination and then accelerated electron transfer , which are verified by photoluminescence (PL) emission spectra , impedance spectroscopy (EIS) and photocurrent response curves. Notably, the mass activity of TCPP/NiCo 2 O 4 for MOR under visible light irradiation is 299.2 mA mg −1 , higher than that of pure NiCo 2 O 4 under dark (51.2-fold) and under visible light (36.5-fold). This study is very meaningful for the development of efficient noble-metal free photoelectrocatalysts for MOR.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiaming Li,Zhaoping Chen,Jianming Liu,Enrou Mei,Xiaojuan Liang,Jianping Liu,Weidong Xiang
CsPbX 3 (X = Br, I) quantum dots (QDs) have gradually become the star materials in light-emitting diodes (LED), but its stability has a big impact on development. Here, a variety of novel CsPbX 3 -TS-1 nanocomposites have been fabricated and the luminescence wavelength can be tunable by varying the halide nanocomposites (Br, I). What's particularly nice is that the original photoluminescence quantum yield (PLQY) of CsPbBr 1 l 2 QDs approaches 82% and it still has close to 74% after being combined with TS-1. Besides, the nanocomposites enhance stability resisting moisture, thermal stressing and light. In addition, a 460 nm InGaN blue chip, YAG:Ce 3+ and CsPbBr 1 I 2 -TS-1 were equipped with white light emitting diodes (WLEDs), with a luminous effect of 95 lm/W, a color rendering index of 80, and a color temperature of 5144 K. Meanwhile, wide color gamut (116% of the National Television Standards Committee, 86.3% of the ITU-R Recommendation BT. 2020) and great chromaticity coordinate (0.3425, 0.3408) are realized. This is a very important step to open up the awkward situation of the practical application of perovskite QDs materials in LED.
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高影响因子
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