Energies
·
2023
·Vol. 16
·期 18
·6426
·
IF 3.2
Jiajie Cheng,Jiahao Yan,Jiaming Wang,Yufan Jiang,Jie Xing,Hao Liu,Huiying Hao,Jingjing Dong
An increasing number of researchers are interested in studying CsPbBr3perovskite solar cells (PSCs) due to their high stability. However, the use of methanol during the spin-coating process is extremely hazardous, both to humans and the environment. CsBr is very soluble in water, but owing to its high specific heat capacity, water causes uneven crystallization and the creation of pores, which negatively impact the performance of CsPbBr3devices. In this paper, water is introduced as the solvent for CsBr in place of methanol to prepare CsPbBr3films and ethanol is used as the surface treatment solvent. The morphology and crystal quality of CsPbBr3films are improved by varying the concentration and spin-coating cycles of the CsBr/H2O solution and adding ethanol post-treatment. The results show that high-quality CsPbBr3films with reduced grain boundaries and high phase-purity were obtained by spin-coating 100 mg/mL CsBr/H2O solution three times and using ethanol as a post-treatment. The CsPbBr3solar cells yielded a maximum efficiency of 7.65% and demonstrate long-term stability over 1100 h.Keywords:perovskite solar cells;CsPbBr3;green solvent;post-treatment
研究领域:
材料科学
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能源研究
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Dongsheng Zhao,Jiyu Song,Yiwen Zhang,Zhiquan Lin,Bo He,Nanfu Qiao,Kangping Huang,Wei Zhang,Shuang Ge,Yuying Li,B. Larry Li,Kang Xie,Guicai Liu
To tune both water transport and solute rejection (i.e., permselectivity) of nanofiltration (NF) membranes, polyamide (PA) films were synthesized under the same interfacial polymerization (IP) conditions following distinct posttreatments, and the underlying relationship between the PA structure and membrane performance was systematically investigated. The combination of hexane activation and water curing was the optimal posttreatment process, which significantly increased membrane permeability from 6.7 ± 0.4 to 19.8 ± 0.8 L·m −2 ·h −1 ·bar −1 and enhanced the selectivity of NaCl/Na 2 SO 4 from 9.6 ± 1.2 to 45.8 ± 0.8. For this combined posttreatment process, the outstanding permeability was due to the enlarged PA film pore size, the enhanced hydrophilicity and the reduced PA thickness and crosslinking degree, and the high NaCl/Na 2 SO 4 selectivity was attributed to the increased electrostatic repulsion between the hydrolyzed acyl chloride groups (i.e., carboxyl groups) and divalent anions. Furthermore, a continuous filtration of 10 days was implemented, and the permeation flux and salt rejection trends for the fabricated PA membranes were maintained at high levels, which indicated excellent long-term stability for the combined posttreatment process. The results of the current study are of paramount practical significance for the reconciliation of permeability and selectivity in water treatment and resource recovery from wastewater.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2025
·
IF 2.3
Chungang Yuan,Zeyu Luo,Chunjiang Liu,Junhou Zhang,Liwei Zheng,Xiaoying Ma,Yujue Wang,Shiwei Guo
Solvent post-treatment is an effective strategy for regulating polyamide nanofiltration membranes. However, the regulatory mechanism behind this process requires further supplementation and improvement. In this study, different polar solvents (polarity order: acetonitrile > methanol > ethanol > acetone > n-butanol > n-hexane) were used for post-treatment of PEI nano-filtration membranes to compare and analyze the influence of solvent post-treatment on the performance of PEI nano-filtration membranes (flux, salt and heavy metal retention). Combined with the comprehensive physicochemical characterization (SEM, FTIR, XPS, contact angle), the regulatory mechanisms of different solvent post-treatments on PEI nanofiltration membranes were analyzed and summarized. The results revealed that the effect of solvent post-treatment on PEI-TMC polyamide is different from that of the MPD and PIP systems, possibly due to the larger molecular weight and acyclic molecular chain structure of PEI. Moreover, the solvent post-treatment mainly modulates the polyamide structure through two mechanisms: the swelling effect and the miscibility-promoted further reaction or hydrolysis. The former is the primary mechanism that determines the changes in separation properties. And the chemical structure of the polyamide surface is primarily influenced by the mutual dissolution promoted reaction or hydrolysis. This study improves the understanding of solvent post-treatment of interfacial polymerization and provides inspiration for performance modulation of positively charged PEI NF membranes.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Applied Sciences-Basel
·
2021
·Vol. 11
·期 16
·7476
·
IF 2.679
Lei Xing,Jingui Yu,Zhiyong Ji,Xingjiu Huang,Chaoyuan Dai,Qiaoxin Zhang
Superhydrophobic surfaces are used in aerospace, medical equipment, transportation, household appliances and other fields due to their special interface characteristics. In this paper, a superhydrophobic surface is prepared by Selective Laser Melting (SLM) 3D-printed technology, comparing the effects of different post-treatment methods and time on corrosion resistance, and revealing the root cause of the transition from hydrophilic to superhydrophobic. The test results show that for samples not treated with fluoro-silane, the microstructure adsorbs the organic matter in the air and reduces the surface energy, which is the root cause of the sample surface changing from hydrophilic to superhydrophobic. In addition, the corrosion resistance of 3D-printed, polished, 3D-printed + modified, and 3D-printed + corroded samples are analyzed. Among them, 3D-printed + modified samples have a longer resistance to corrosion, and after placing in outdoor natural conditions for 60 days, the contact angle of water droplets on the surface is 150.8°, which still has superhydrophobic properties and excellent natural durability.Keywords:3D printed;post-treatment process;superhydrophobic;wettability;corrosion resistance
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2024
·
IF 4.2
Cheng Wang,Fuling Du,Lipeng Wang,Qianru Yu,Xinchao Liang,Siqi Liu,Zhe Lei
TiO 2 /ZSM-5 composites with enhanced adsorption and photocatalytic properties were synthesized via regulation of synthesis pH value and post (acid/alkali) treatment of ZSM-5. The influences of synthesis pH values and post-treatment of ZSM-5 on microstructure, adsorption and photocatalytic properties of the composites were investigated. The methyl orange was used to assess the adsorption and photocatalytic properties of the samples. The results showed that the synthesis pH values and acid/alkali treatment had significant influences on the microstructure, adsorption and photocatalytic properties of TiO 2 /ZSM-5 composites. The composites synthesized at pH 7 had a relatively higher TiO 2 content, smaller anatase crystallite size, greater specific surface area, the most effective separation of photogenerated electron-hole pairs, the fastest interfacial charge transfer, and therefore exhibited excellent adsorption and photocatalytic properties. Acid treatment could significantly increase the specific surface area, Si/Al ratio of ZSM-5, the separation efficiency of photogenerated electron-hole pairs, and amount of produced active free radicals •O 2 – and •OH. The TiO 2 /acid-treated ZSM-5 exhibited excellent photodegradation with 99.3 % methyl orange in 150 min, which is higher than that of the TiO 2 /ZSM-5 and TiO 2 /alkali-treated ZSM-5.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Liang Chu,Zhaokun Wang,Zhaohui Liu,Teng Zhao,Liyan Wang,Mu Yang,Ge Wang
Host-guest catalysts are promising for tailored applications but require innovative synthesis strategies. Herein, we report the first ambient aqueous-phase synthesis of bimetallic Ce/Zr MOF-801, followed by acid post-treatment. Utilizing defect engineering, Ce species are preferentially exposed within the robust Zr-MOF-801 substrate. This structural modification substantially enhances the host–guest catalyst’s oxidative desulfurization (ODS) performance. We systematically investigate synthesis parameters, spatiotemporal yield, and defect characterization, and refines catalytic conditions. Post-acid-treated Ce/Zr-MOF-801-H displays augmented external surface area (189 m 2 g −1 ), and exposed acidic sites while upholding the outstanding intrinsic stability of the Zr-MOF-801 substrate. Under optimal conditions (60 °C, 6 min), Ce/Zr-MOF-801-H completely eliminates dibenzothiophene (1000 ppm S), with a turnover frequency of 39.3 h −1 and catalytic activity of 53.2 mmol g −1 h −1 , far surpassing Zr-UiO-66-H. It maintains a desulfurization rate of 96.6% after five cycles. FTIR spectroscopy, quenching experiments, and ESR spectroscopy reveal that the exposed Ce sites serve dual roles: (1) activating the substrate by reducing the electron density of sulfur atoms and (2) facilitating H 2 O 2 into hydroxyl and superoxide radicals, driving ODS. This strategy not only advances industrial ODS applications but also sheds light on the synthesis of MOF-based host–guest catalysts.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
Advanced Energy Materials
·
2022
·Vol. 12
·期 33
·2201787
·
IF 29.698
Jian Xiong,Naihe Liu,Xiaotian Hu,Yifang Qi,Weizhi Liu,Junqian Dai,Yongsong Zhang,Zhongjun Dai,Xiaowen Zhang,Yu Huang,Zheling Zhang,Qilin Dai,Jian Zhang
Defects in perovskite films and the suboptimal interface contact largely limit the performance and stability of inverted perovskite solar cells (PSCs). A simple surface post-treatment with N -benzyloxycarbonyl- d -valine (NBDV) is developed to overcome these problems. The device performance following NBDV treatment is systemically investigated. It is showed that NBDV surface post-treatment results in the bulk restructure of the entire perovskite film and improves the film-forming property of [6,6]-phenyl-C 61 -butyric acid methyl ester. The grain sizes, crystallinity, trap states, cathode interfaces, as well as the built-in field are also improved, which result in PSC performance and stability enhancement. A relatively higher power conversion efficiency (PCE) of 21.80% is reached, which is comparable to the PCE record based on single-crystal MAPbI 3 . Meanwhile, the PCE of the NBDV devices can retain ≈77% and 84% of the initial value after storage for 768 h (32 days) in air and 8376 h (349 days) in N 2 , respectively, while the control devices only maintain ≈53% and 38% of their initial PCE values under the same exposure conditions. This work provides means to promote bulk, surface, and interface regulation toward high performance and stable inverted PSCs.
研究领域:
材料科学
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光伏技术
✓ 已验证
DOI
高影响因子
Journal of Central South University
·
2023
·Vol. 30
·期 8
·2501-2509
·
IF 4.4
Liu Wen-bo,Du Xue-rong,Wang Cheng-cheng,Zhuo Chun-xue,Chang Jin,Wang Na-na,Li Ren-zhi
Cesium copper halides have attracted increasing attention for light-emitting diodes (LEDs) applications due to their high photoluminescence quantum efficiency (PLQE) and non-toxicity. However, the current film fabrication methods for copper halides cannot simultaneously meet the high-performance, eco-friendly, and good environmental tolerance requirements. Here, we demonstrate a facile approach that combines the advantages of both traditional nanocrystal-based methods and precursor solution-based methods. Through treating Cs 3 Cu 2 I 5 nanocrystal films with proper alcohols, Cs 3 Cu 2 I 5 /CsCu 2 I 3 mixed-dimensional copper halides are formed with enhanced PLQE and improved energy level matching. This enhances the peak EQE of copper halide LEDs to 0.8%, which is among the highest efficiency of lead-free metal halide nanocrystal LEDs. This work provides a new strategy for fabricating high-performance lead-free LEDs in an eco-friendly manner.
研究领域:
材料科学
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光电技术
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2020
·
IF 5.825
Xingang Li,Jianing Lai,Haifeng Cong,Chang Shu,Runnan Zhao,Yiwei Wang,Hong Li,Xin Gao
The initial aim of this paper is to dramatically improve the post-treatment stage of biodiesel production, which converts problematic glycerol to solketal (SK), by introduction of an eco-efficient integrated reactive and dividing wall distillation process. To overcome the chemical equilibrium limitations and the long post-treatment process with the high energy consumption and waste water emission, this study provides the potentially, sustainable and novel reactive distillation (RD) process for cleanly catalytic synthesis of SK, taking into account costs and environmental impact. The ketalization kinetics experiments were carried out to provide a basis for subsequent experiments and simulations. A reliable model was established for further RD technological design and validated by the pilot-scale experiments. Through sensitivity analysis, the effects of multiplex parameters in RD process were determined. The advanced intensification of SK production by reactive dividing wall column (RDWC) achieves reduction in energy, total annual cost (TAC) and CO 2 emissions of 13.9 %, 18.2 % and 16.4 % (as oil resources), respectively, compared to the optimal SK production by RD process. This proposed technology is also compared with the conventional industrial route of ketalization with 18.7 % energy saving.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Tianxing Yang,Yuliang Feng,Rui Ma,Qiang Li,Hong Yan,Yanan Liu,Yufei He,Jeffrey T. Miller,Dianqing Li
In this work, a simple post-treatment has been carried out on a solid palladium–copper alloy to enhance the ethylene selectivity without any loss of activity. In all catalysts, PdCu/C catalysts post-treated at 375 °C exhibit improved ethylene selectivity (86%) compared to the solid PdCu/C catalysts (61%) at 100% acetylene conversion with comparable catalytic activity. During the post-treatment, the average size of PdCu nanoparticles is maintained at 6.6–6.8 nm, and no obvious segregation is observed. X-ray photoelectron spectroscopy and in situ extended X-ray absorption fine structure (EXAFS) results display that Pd is in a metallic state for all PdCu catalysts before and after post-treatment. Moreover, the EXAFS fitting results show that the Pd–Pd bond is gradually replaced by the Pd–Cu bond. The good separation of Pd atoms by Cu is also proven by XRD characterization, which shows that a body-centered cubic PdCu structure with uniform distribution of Pd and Cu in a unit cell forms under 375 °C post-treatment. The rearrangement of Pd and Cu atoms has a limited impact on the surface Pd dispersion, avoiding the activity loss due to the decrease in Pd sites. The improved selectivity could be attributed to the isolation of Pd and the accompanied d-band center downshifting, which favors the desorption of π-bonded ethylene species.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN JOURNAL OF AGRONOMY
·
2023
·
IF 5.2
Die Hu,Wei Chen,Aiqing Miao,Xiaoyan Qiao,Hongling Xia,Chengying Ma
Volatile blends contain numerous information about the emitters. Volatile organic compounds (VOCs) have been used as biomarkers to monitor agri-products’ state during postharvest management. We placed tea shoots at 15 °C or 25 °C after plucking and wondered if the emitted VOCs may reflect the freshness of these plucked tea shoots or differentiate tea shoots experiencing different postharvest treatments . Headspace solid-phase microextraction combined with gas chromatography-mass spectrometry was applied in this research to profile volatiles that were released from plucked tea shoots. Twenty-nine VOCs were found from all tea shoots samples, and the composition of released VOCs varied under different temperatures. Assessed by PLS-DA and two-way ANOVA, fourteen volatiles were selected as putative markers. All the markers were detected under the low-temperature condition, but not under the room-temperature condition. Transcriptome analysis showed that low temperature caused less variation in gene expression compared to room temperature. Many genes in volatile biosynthetic pathways had similar expression trends in either condition, while some changes occurred with a delay in the low-temperature environment. The study advances the understanding of the physiological changes of tea shoots subjected to temperature-dependent postharvest treatments .
研究领域:
植物学
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食品科学
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分子生物学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 15
·2670
·
IF 5.719
Jizhen Yang,Fan Li,Guibin Lu,Yuanbin Lu,Chuanbo Song,Rong Zhou,Shaohua Wu
Crude oil spills seriously harm the ocean environment and endanger the health of various animals and plants. In the present study, a totally biodegradable polymer, poly(L-lactic acid) (PLLA), was employed to fabricate highly porous oil absorbent nanofibrous materials by using a combination of electrospinning technique and subsequent acetone treatment. We systematically investigated how the electrospinning parameters affected formation of the porous structure of PLLA nanofibers and demonstrated that PLLA nanofibers with decreased and uniform diameter and improved porosity could be rapidly prepared by adjusting solution parameters and spinning parameters. We also demonstrated that the acetone treatment could obviously enhance the pore diameter and specific surface area of as-optimized electrospun PLLA nanofibers. The acetone treatment could also improve the hydrophobic property of as-treated PLLA nanofiber membranes. All these led to a significant increase in oil absorption performance. Through our research, it was found that the oil absorption of PLLA nanofiber membrane increased by more than double after being treated with acetone and the oil retention rate was also improved slightly.Keywords:PLLA;electrospinning;porous structure;acetone post-treatment;oil absorption
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）