Applied Materials Today
·
2019
·
IF 8.013
Linghui Zhang,Qisheng Sun,Youkui Xu,Lili Han,Qian Wang,Yangchun Yu,Zhiwen Jin,Shikuan Yang,Zhipeng Ci
Fabrication of ultrathin ( e.g. , ∼2 nm) CsPbBr 3 nanowires is still challenging for existing methods, for the extremely fast crystal growth process of CsPbBr 3 . Here, we developed a self-assembled nanotemplate-confined growth concept to prepare ultrathin CsPbBr 3 nanowires. During electrospinning using the N , N -dimethylformamide (DMF) solution composed of polymethyl methacrylate (PMMA), PbBr 2 , CsBr, and capping agents, PMMA chains would assemble into nanochannels acting as nanotemplates within the electrospun PMMA fibers. Owing to the very limited amount of precursors within the nanochannels, ultrathin CsPbBr 3 nanowires were prepared after DMF evaporation. The CsPbBr 3 nanowires within the PMMA fibers or dispersed in toluene showed bright blue luminescence. The structure of the CsPbBr 3 products could be adjusted by the stirring time, as well as the amount of PMMA, PbBr 2 , and CsBr in DMF. Overall, we developed a new method towards engineering ultrafine CsPbBr 3 nanostructure through self-assembled template-confined growth concept during electrospinning, which may find potential applications in blue light emitting diodes and other optoelectronic devices.
研究领域:
材料科学
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纳米技术
·
光电子学
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DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2023
·
IF 2.8
Zheng Li,Jing Wang,Xiaoxia Peng,Yu Chen,Mengyuan Geng
Hydrogen sulfide plays an essential roles in physiological and pathophysiological process. It is still a challenge to design a simple and reasonable H 2 S-specfic fluorescent probe. Herein, we develop a simple reaction-based fluorescent probe for detecting H 2 S in DMF/Tris-HCl buffer system. Fluorescence emission spectra were used to investigate the recognition performance of probe L towards hydrogen sulfide. The results shown that probe L has a specific recognition towards hydrogen sulfide over other tested metal cations and anions with a rapid response. The probe L combined with H 2 S in a 1: 1 manner with a detection limit of 0.372 μM. The appropriate pH range for detecting H 2 S was 4 ∼ 8. The proposed recognition mechanism was studied by fluorescence titration spectrum, Job’s plot, 1 H NMR titration experiment and mass spectrometry analysis. Moreover, probe L was applied in real water samples, test strips and fluorescent films to detect H 2 S successfully.
研究领域:
分析化学
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生物化学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Jia-rong Guo,Bin Xu,Yan Wang,Ling-hua Zhuang,Guo-wei Wang
3,3′-(Oxidi-2,1-ethanediyl)bis[1-methyl-imidazolium] dihexafluorophosphate ([C4O(mim)2][PF6]2) was synthesized and confirmed with 1H NMR and FT-IR. The thermal stability of [C4O(mim)2][PF6]2 was studied with differential scanning calorimetry and thermogravimetric analyses. Using the dynamic method, the solubility of [C4O(mim)2][PF6]2 in five different pure solvents (water, methanol, ethanol, acetone, and acetonitrile) and binary mixtures (water + DMF) was measured at the temperature range from (283.00 to 323.00 K) at atmospheric pressure. The solubility of [C4O(mim)2][PF6]2 in those selected solvents increased with increasing temperature and DMF contents, but the rate of solubility is different. The experimental data were correlated with the modified Apelblat equation. Also, the solubility of [C4O(mim)2][PF6]2 and [C6O2(mim)2][PF6]2 was been compared in the same solvent.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Shenghan Gao,Yuting Luo,Bo Li,Wen Cai,Huai Liu,Rui Zhang,Wenlong Jia,Lincai Peng
Modulating the electronic environment of single-atom metal catalysts is a promising yet challenging strategy to optimize their catalytic performance. Herein, electron-rich Ru single atoms were successfully confined within a CoOx matrix (Ru0.6CoOx) through a simple manual grinding-reduction strategy. The resulting Ru0.6CoOx catalyst demonstrated exceptional catalytic activity for the hydrogenolysis of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF), affording a nearly quantitative DMF yield with an impressive DMF productivity of 210.2 molDMF·mol–1Ru·h–1 at 160 °C. This productivity outperforms most of the noble metal-based catalysts for DMF production. Notably, Ru0.6CoOx also enabled the efficient conversion of HMF to DMF at a low reaction temperature of 120 °C or using a concentrated HMF solution (up to 20 wt %). Experimental studies combined with density functional theory calculations (DFT) revealed that the electronic interaction between the Ru species and CoOx generates electron-rich Ru single atoms, which serve as active sites to boost the H2 activation. Furthermore, the introduction of single Ru atoms was shown to increase the acidity of Ru0.6CoOx, thereby facilitating the cleavage of the C–OH bond during HMF hydrogenolysis. The boosted H2 activation ability and improved acidity of Ru0.6CoOx contribute significantly to its outstanding catalytic performance. This work provides valuable insights into the preparation of electron-rich single-atom metal catalysts for the catalytic hydrodeoxygenation of biomass-derived chemicals.
研究领域:
催化化学
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材料科学
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化学工程
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生物质转化
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密度泛函理论（DFT）
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 8
·2995-3002
·
IF 6.4
Wenwei Lai,Chuanli Wu,Xiuxun Han
CsPbBr3 nanocrystals (NCs) exhibit great potential for various optoelectronic applications due to their excellent optoelectrical properties. However, the poor stability inherited from the ionic crystal structure limits their practical applications. Hence, coupling CsPbBr3 NCs with protective and functional materials for achieving superior properties is one of the current research challenges. Herein, three-dimensional hyperbranched structures of Eu-MOF were developed as effective frameworks coupled with CsPbBr3 NCs. Rich Eu-MOF morphologies including sheaf-like, dumbbell-like, and urchin-like ones were achieved in a controllable way via introducing an Al(Ac)3 additive. The crystal splitting growth mechanism was found to dominate the formation of hierarchical Eu-MOF structures, as evidenced by the time-dependent morphological evolution of an urchin-like Eu-MOF. In addition, acidic carboxylate salts (such as Al(Ac)3, Zn(Ac)2, Pb(Ac)2, Cu(Ac)2, Ni(Ac)2) effectively modulate the splitting of Eu-MOF crystal growth, which is deemed to be the synergistic effect of metal ions and acetate ions. Subsequently, a series of CsPbBr3/Eu-MOF composites were synthesized by pre-preparing various Eu-MOF hyperbranched structures, and they demonstrate excellent dual-emissive optical properties. A ratiometric fluorescence probe fabricated by encapsulating CsPbBr3 in the three-dimensional hyperbranched Eu-MOF structure exhibits remarkable sensitivity, good linearity, and high selectivity for DMF detection.
研究领域:
材料科学
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化学
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纳米技术
·
光电
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分析化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yating Fang,Yue Jiang,Zhengchi Yang,Zhengjie Xu,Zhen Wang,Xubing Lu,Xingsen Gao,Guofu Zhou,Jun-Ming Liu,Jinwei Gao
With the steady industrialization process of the perovskite solar cells (PSCs), the toxicity of the used solvents has become a pivotal issue that needs to be addressed. Especially, the usage of N,N-dimethylformamide (DMF) solvent would pose serious environmental and health concerns. Herein, we have reported a nontoxic solvent N-formylmorpholine (NFM) to replace the toxic DMF and have achieved a higher PCE of 22.78% compared to 21.97% when DMF was adopted. Moreover, with NFM, a widened antisolvent processing window was observed, facilitating the fabrication of PSCs with high reproducibility. This solvent engineering strategy offers an important solution to prepare eco-friendly, efficient, and stable perovskite solar cells.
研究领域:
材料科学
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可再生能源
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太阳能电池技术
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环境科学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2024
·
IF 6
Letu Siqin,Chenjun Yang,Jingyuan Guo,Yutian Wang,Lei Wang,Yuan Li,Yiming Wang,Shuyu Li,Xiangyu Chen,Hongmei Luan,Ruijian Liu,Chengjun Zhu
The high open-circuit voltage deficit (V OC, def ) caused by structural imperfections in the absorber layer and charge loss during carrier transport is a critical barrier affecting the performance of Cu 2 ZnSn(S,Se) 4 (CZTSSe) devices. In this work, Ag was added to the DMF-based Cu + -Sn 4+ system, which significantly improved the crystal morphology and electrical properties of the absorber layer. Additionally, optimizing the selenization process not only reduced surface roughness and eliminated voids at the bottom of the absorber layer but also resulted in the formation of a MoSe 2 back interface layer with a more suitable thickness. These measures collectively enhanced the overall quality of the absorber layer, reducing the formation of deep-level defect clusters and effectively boosting carrier transport efficiency. Consequently, the concentration of bulk and interfacial defects decreased, and the impact of potential barriers on carrier movement was minimized. With these comprehensive improvements, the power conversion efficiency of CZTSSe solar cells increased from 8.48 % to 11.23 %. Our research demonstrates that optimizing the structure of the absorber layer can effectively enhance the performance of CZTSSe solar cells, providing valuable insights for the fabrication of high-efficiency devices in the future.
研究领域:
材料科学
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太阳能
·
半导体物理
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 22
·期 2
·532-539
·
IF 9.405
Qixuan Lin,Shouwei Liao,Libo Li,Weiying Li,Fengxia Yue,Feng Peng,Junli Ren
In this study, experiments and molecular dynamics simulations were combined to get insights into the role of solvent during the process of xylose conversion under catalyst-free conditions. Solvents used for furfural production were comparatively discussed, including traditional and emerging biomass-derived solvents – water, dimethyl sulfoxide (DMSO), dimethyl formamide (DMF), isopropanol (ISO), γ-butyrolactone (GBL) and γ-valerolactone (GVL). The degradation behavior of solvents, the solubility and α/β ratio of xylose, the distribution of the solvent around xylose/furfural and the hydrogen bonding between them were also studied. The results showed that in pure solvents, the different hydrogen bonding between xylose and the solvent resulted in different products. Water was a favourable solvent for xylose to form furfural among these pure solvents because less formic acid was produced from xylose in water under catalyst-free conditions. Furfural could be produced in mixed solvents if there was more water around xylose, which was similar to the case in pure water. Otherwise, the situation in mixed solvents was similar to that in the corresponding pure organic solvents. GBL and GVL, as green solvents, had weaker affinities with xylose than DMSO, DMF and ISO, but were intensively attracted by furfural, thus they could provide protective shells for furfural, which played a positive role during the production of furfural. The highest furfural yield of 46.4% was achieved in GBL–H2O at 180 °C – 150 min in the absence of catalysts.
研究领域:
化学工程
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生物质转化
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分子动力学模拟
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绿色化学
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 28
·期 6
·1737-1747
·
IF 2.496
Jiang Haoxi,Zhao Yingying,Lin Jing,Chen Yifei,Wang Sheng
Highly dispersed palladium nanoparticles (NPs) supported on UiO-66 as catalyst for CO 2 methanation were prepared by supercritical fluid deposition (SFD). As a result, the most suitable Pd precursor salt and co-solvent are Na 2 PdCl 4 and ethanol/DMF, respectively. The best SFD process condition to deposit the Pd precursor on UiO-66 is 40 °C, 10 MPa and 2 h. Under the above condition, 4% Pd/UiO-66 exhibits the highest activity with 53% of CO 2 conversion and 95% of CH 4 selectivity while the turnover frequency (TOF) value is 3669.4 h −1 . The catalysts were characterized by XRD, BET, TEM, XPS, TGA, CO-DRIFTS and ICP-OES to investigate the structure–activity relationship. The 4% Pd/UiO-66 with the average size of 2.2 nm of Pd prepared in assistance of supercritical fluid behaved the similar activity as the 6%Pd/UiO-66 with average size of 9.7 nm of Pd prepared by sol–gel method. It is showed prospect of technique for reducing noble metal loading resulting from high dispersion effect.
研究领域:
催化
·
材料科学
·
化学工程
·
环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yi Guo,Shuxuan Li,Baowei Su,Bishnupada Mandal
The solvent resistance performance of organic solvent nanofiltration (OSN) membranes still need to improve for their applications in harsh organic environments. We envisioned that fluorine (F) atoms could enhance the solvent resistance of OSN membranes owing to the high bond energy of C-F bonds. Herein, a kind of novel solvent-resistant F-containing OSN membranes was successfully prepared via interfacial polymerization (IP), chemical crosslinking and solvent activation processes. Mixtures of m-phenylenediamine (MPD) and 5-(trifluoromethyl)-1,3-phenylenediamine (TFMPD) were used as aqueous monomers, and trimesoyl chloride (TMC) was used as an organic monomer. The incorporation of F-containing monomer is proved useful to regulate the surface morphology and the roughness of the OSN membranes. Two folds increase in permeance for ethanol (achieving 41.6 L m −2 h −1 MPa −1 ) and a rejection of 99.4% for Rhodamine B (479 Da) were achieved at optimal F-containing monomer ratio. Three persistent static immersion tests, in NMP for 90 days (room temperature), in NMP for 10 days (80 °C), and in DMF for 31 days (80 °C), respectively, and one continuous cross-flow filtration test for 104 h using Rose Bengal (1017 Da)/DMF solution at room temperature demonstrated that the prepared OSN membranes owned an outstanding solvent resistance, proving vast potential in organic solvent separation and purification.
研究领域:
材料科学
·
化学工程
·
膜技术
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Changhui Zhu,Haiyong Wang,Chilu Cai,Kang Bi,Bijuan Cai,Xiangbo Song,Qiying Liu,Longlong Ma
Biomass-derived 2,5-dimethylfuran (DMF) is an ideal, renewable gasoline additive, and its production with high productivity is highly desirable. A continuous production route was developed to yield DMF from fructose via a tandem strategy, where dehydration catalysts (HY zeolite and niobium phosphate) assisted by 1-butyl-3-methylimidazolium chloride ([BMim]Cl) and hydrodeoxygenation (HDO) catalyst Cu–Ru/C were integrated into one reaction system with γ-butyrolactone (GBL) as the mobile phase. Optimum conditions, such as temperature, H2 pressure, weight hourly space velocity, and [BMim]Cl concentration, were investigated systematically, with an initial HDO study by using 5-hydroxymethylfurfural (HMF) as substrate and subsequent tandem dehydration and HDO to produce DMF with fructose as substrate. Among the conditions, the highest yield of DMF at 55.2% was gained by niobium phosphate and Cu–Ru/C, with the aid of [BMim]Cl in a fixed bed. Meanwhile, [BMim]Cl facilitated fructose dehydration to HMF and also mediated HDO of the resultant HMF by stabilization, which was clarified by 1H NMR and FTIR spectroscopy. Finally, the fact that carbon deposit led to catalyst deactivation was examined thoroughly via a series of characterization techniques. This work achieved continuous DMF production from fructose and laid a foundation for future possible amplification of DMF.
研究领域:
化学工程
·
催化
·
可再生能源
·
生物燃料
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Guang Yang,Yudong Luo,Yanhong Bian,Xi Chen,Lu Chen,Xia Huang
In electro-mediated biological system (EMBS), biological anode and cathode components were incorporated into an anaerobic bioreactor, providing a small amount of oxygen to the cathode as an electron acceptor. Oxygen diffusion also impacts the anode's anaerobic ecological environment. This study unraveled how oxygen influences the metabolism and electron transport chain during the biological oxidation of refractory organics. Under the influence of electromotive force, the straight-chain model pollutant N,N -dimethylformamide (DMF) showed rapid degradation and better ammonification, with maximum rates reaching 0.53 h -1 and 26.6 %, respectively. Elevated electromotive force promoted the enrichment of functional electroactive bacteria on the anode and enhanced the availability of electron storage sites, thereby facilitating electron transfer at the anode-biofilm interface. Conversely, the anodic micro-aerobic environment disrupted the anaerobic microbial community structure, and the competitive interactions among fermentative bacteria and electroactive bacteria inhibited DMF degradation. Metagenomic analysis confirmed that cathodic oxygen up-regulated the pyruvate metabolism and the tricarboxylic acid (TCA) cycle to generate NADH and synthesize ATP. The electromotive force induced by cathodic oxygen accelerated the electron transfer in respiratory chains of electroactive bacteria, driving the oxidation of NADH and enhancing the degradation of organics. This study improves our understanding of the regulatory mechanisms governing metabolic pathways under the influence of cathodic oxygen. It offers potential for developing more efficient EMBS in industrial wastewater pretreatment, ensuring that oxygen is prevented from diffusing to the anode during micro-aeration at the cathode.
研究领域:
环境工程
·
生物技术
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微生物学
·
废水处理
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）