JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2013
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IF 2.004
Neng Gao,Guangming Chen,Yunyun Jiang,Lingyun Fang,Yijian He
Properly choosing additives to conventional lithium bromide aqueous solution to improve the performance is an important part in lithium bromide absorption refrigeration studies. Mixtures consisting of lithium bromide + triethylene glycol + water, lithium bromide + propylene glycol + water, lithium bromide + sodium formate + water, and lithium bromide + potassium formate + water were thought to be four promising alternatives to lithium bromide aqueous solutions. In the study, heat capacities of the four kinds of solutions were measured using a calvet type calorimeter at temperatures from 308.15 K to 348.15 K. The experimental data were regressed using a stepwise statistical method, and the corresponding equations for each kind of solution were given. The average absolute deviations between experimental and calculated values were no more than 0.12 % for all of the systems.
研究领域:
化学工程
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热力学
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DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Yin Shuhu,Chen Long,Yang Jian,Cheng Xiaoyang,Zeng Hongbin,Hong Yuhao,Huang Huan,Kuai Xiaoxiao,Lin Yangu,Huang Rui,Jiang Yanxia,Sun Shigang
Replacement of expensive and rare platinum with metal–nitrogen–carbon catalysts for oxygen reduction reactions in proton exchange membrane fuel cells is hindered by their inferior activity. Herein, we report a highly active iron-nitrogen-carbon catalyst by optimizing the carbon structure and coordination environments of Fe-N 4 sites. A critical high-temperature treatment with ammonium chloride and ammonium bromide not only enhances the intrinsic activity and density of Fe-N 4 sites, but also introduces numerous defects, trace Br ions and creates mesopores in the carbon framework. Notably, surface Br ions significantly improve the interaction between the ionomer and catalyst particles, promoting ionomer infiltration and optimizing the O 2 transport and charge transfer at triple-phase boundary. This catalyst delivers a high peak power density of 1.86 W cm −2 and 54 mA cm −2 at 0.9 V iR-free in a H 2 -O 2 fuel cells at 80 °C. Our findings highlight the critical role of interface microenvironment regulation.
研究领域:
电化学
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催化
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能源材料
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燃料电池
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DOI
PubMed
高影响因子
Journal of Environmental Sciences
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2024
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IF 5.9
Wei Hou,Qian Zheng,Hengyue Xu,Guangming Zhan,Long Zhao,Jie Dai,Jiaxian Wang,Xingyue Zou,Bing Zhou,Lufa Hu,Ruizhao Wang,Kaiyuan Wang,Yancai Yao,Lizhi Zhang
Atomic hydrogen (H*) plays a crucial role in electrochemical reduction technology towards various environmental and energy applications, but suffers from low utilization efficiency arisen from the undesirable H–H dimerization and the competitive adsorption between water molecule with reactants on the traditional adjacent catalytic sites. Herein, we anchored Pd single atoms on the naturally formed titanium oxide of titanium foam to construct Pd 1 -O-Ti dual-site electrocatalyst with spatially isolated water dissociation and H* utilization site, which synchronously inhibits the H–H dimerization and the competitive adsorption of water molecule and targeted reactants. Experiments and theoretical calculations revealed that the Ti–O sites could synergistically dissociate water to H*, which overflowed to nearby Pd single-atom sites for designed reduction reactions and utilization benefiting from the hydrogen spillover ability of titanium oxide substrate. These Pd 1 -O-Ti dual sites delivered almost 100 % bromate reduction efficiency with a rate constant of 1.57 h –1 , far superior to those of Pd n -O-Ti with adjacent Pd sites (0.52 h –1 ), Pd 1 -N-C with single sites (0.04 h –1 ) and commercial Pd/C (0.18 h –1 ), respectively. This study sheds light on the importance of integrating synergistic active sites for complicated electrochemical reactions, and provide new insights in improving H* utilization for environmental remediation.
研究领域:
环境科学
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材料科学
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电化学
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DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Lixiang Wang,Jingwen Li,Mingqiang Li,Xinping Duan,Haochen Weng,Shuailiang Xu
In this study, we introduce a novel “water-in-salt” electrolyte for Bromine-ion batteries (BIBs) for the first time: 3M AlCl 3 + 1M NH 4 Br. The 3M AlCl 3 establishes the “water-in-salt” system, while 1M NH 4 Br supplies Br- ions. Employing flexible graphite paper as the cathode, during charging, Br- cooperates with AlCl 3 , forming AlCl 3 Br - ions that embed into the graphite paper, resulting in reversible reactions during discharge. The anode utilizes various metals such as Zn, Cu, Pb, In 2 O 3 , undergoing reversible redox reactions in the charge–discharge process. The designed electrolyte effectively prevents elemental bromine generation, presenting a safe, green, and environmentally friendly aqueous electrolyte suitable for BIBs.
研究领域:
能源存储
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材料科学
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环境科学
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DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 11
·2563
·
IF 3.1
Qi Liu,Hang Li,Xiaoqian Wang,Jiazhen He,Xuemin Luo,Mingwei Wang,Jinfeng Liu,Yong Liu
Amidst the rapid advancements in the fields of photovoltaics and optoelectronic devices, CsPbBr3nanosheets (NSs) have emerged as a focal point of research due to their exceptional optical and electronic properties. This work explores the application potential of CsPbBr3NSs in photonic and catalytic domains. Utilizing an optimized hot-injection method and a ZnBr2-assisted in situ passivation strategy, we successfully synthesized CsPbBr3NSs with controlled dimensions and optical characteristics. Comprehensive characterization revealed that the nucleation environment and thickness significantly influenced the structure and optical performance of the materials. The results indicate that the optimized synthesis method enables control over the lateral dimensions of the nanoparticles, ranging from 9.1 ± 0.06 nm to 334.5 ± 4.40 nm, facilitating the tuning of the excitation wavelength from 460 nm (blue) to 510 nm (green). Further analyses involving photoresponse and electrochemical impedance spectroscopy demonstrated the substantial potential of these NSs in applications such as photocatalysis and energy conversion.
研究领域:
材料科学
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光化学
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纳米技术
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Bojie Ding,Xinhao Cai,Shenglin Ma,Ruiting Liang,Imran Khan,Jianbei Qiu,Yue Liu,Anjun Huang,Zhiguo Song,Yangke Cun,Cherkasova Tatiana,Zhengwen Yang
Cesium lead halide perovskite (CsPbX 3 ) quantum dots (QDs) are recognized as viable substitutes for conventional fluorescent powder color converters, which can improve the color gamut and reproducibility of liquid crystal displays (LCDs). Encapsulating QDs in glass can effectively solve the water oxygen stability of QDs, but the glass matrix impedes the nucleation of QDs and the precipitation of QDs requires secondary heating. In our research, we successfully accomplished the self-crystallization of CsPbBr 3 QDs facilitated by LiF within a B 2 O 3 -SiO 2 -ZnO borosilicate glass matrix. The results indicate that the self crystallization of CsPbBr 3 QDs induced by LiF in borosilicate glass matrix has a synergistic effect. The Li + ions can break the glass network structure and facilitate ionic migration and transport, while F − ions have good electronegativity due to ion aggregation, and can strongly attract Cs + and Pb 2+ ions with larger atomic radii, thereby promoting the rapid nucleation and growth of CsPbBr 3 QDs, ultimately synthesizing QDs with uniform particle size, narrow half peak width, good optical properties, and thermal stability.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Peng Zhang,Feiming Li,Shujuan Lin,Wen-Jie Chen,Dejian Chen
Lead halide perovskite nanocrystals (PNCs) have emerged as promising materials for photocatalysis due to their exceptional optoelectronic properties, yet achieving efficient charge separation and selective oxidation reactions remains a significant challenge. In this study, we report the synthesis of Fe 3+ -doped CsPbBr 3 /SiO 2 nanocomposites (Fe-PNCs/SNPs) with gradient energy levels, designed to enhance photocatalytic performance. Our results demonstrate that Fe 3+ doping introduces mid-gap states, promotes photoinduced charge separation, and generates reactive oxygen species (ROS) such as O 2 − and OH radicals under sunlight-simulating light irradiation from a 300 W Xe arc lamp. The Fe 20 -PNCs/SNPs catalyst achieved over 99 % conversion of benzyl alcohol to benzaldehyde with high selectivity and stability in the ethanol under ambient conditions. Additionally, the catalyst exhibited excellent recyclability and broad substrate tolerance. These findings highlight the innovative design of gradient energy levels in perovskite nanocomposites, offering a new strategy for enhancing photocatalytic efficiency in selective organic transformations.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Crystals
·
2024
·Vol. 14
·期 6
·508
·
IF 2.4
Sumei Li,Jian Ji,Saisai Shan,Sha Chen,Hanbing Li,Qian Xu,Yixuan Liang
Tetrabromobisphenol A (TBBPA) is a kind of widely used brominated flame retardant (BFR), which is proven to be harmful to ecological systems and public health. It is very important to remove TBBPA from the environment. In our study, a magnetic composite named Fe3O4/GO/ZIF-67 was synthesized by a coprecipitation method and applied in the highly efficient adsorption of TBBPA from water. Static adsorption experiments demonstrated that the adsorption capacity could reach 232 mg·g−1within 120 min, which is much higher than those reported in the other literature. The experimental results show that the adsorption of TBBPA on Fe3O4/GO/ZIF-67 followed Langmuir and pseudo-second-order kinetic adsorption models. The main mechanisms for these adsorptions were identified as hydrogen bonds between OH groups in TBBPA and COOHs of Fe3O4/GO/ZIF-67, and π-π stacking between Fe3O4/GO/ZIF-67 and TBBPA. This study provides a method with great promise for the design and synthesis of better adsorbents for the removal of TBBPA from the water environment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Yi Zheng,Zongsheng Liu,Bangdong Ge,Meng Ma,Si Chen,Yanqin Shi,Huiwen He,Yulu Zhu,Xu Wang
The incorporation of traditional low molecule bromine flame retardants can enhance the flame retardancy of polycarbonate (PC), yet their poor compatibility with PC impairs its transparency and mechanical properties. Here, brominated polycarbonate (B 50 PC) was synthesized by interfacial polycondensation method using bisphenol A, tetrabromobisphenol A, and triphosgene. The number average molecular weight ( M n ) of B 50 PC reached 14,600, and compared to the low molecule bromine flame retardant tetrabromobisphenol A (TBBPA), its initial decomposition temperature increased by 38.7 % under air atmosphere. The PC composites containing 5 wt% B 50 PC achieved the V-0 rating in the UL-94 test, with LOI increased by 10.3 %. At the same time, the peak heat release rate (PHRR) was decreased by 28.6 % and the ignition time (TTI) was delayed by 21.3 %. Compared with that of samples with TBBPA, the composite with the same amount of B 50 PC maintained the original elongation at break of PC and the transmittance remained at 84.9 %. In summary, the composites with B 50 PC maintains outstanding transparency and mechanical properties while enhancing the flame retardancy. This work has developed a high molecular bromine flame retardant that combines flame retardancy and transparency, offering a strategy for expanding the application of PC in the electronics, construction, and aerospace sectors.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yanling Lin,Zhennan Wu,Enrou Mei,Jiapeng Yang,Ye He,Zhenbo Xu,Xiaojuan Liang,Xingen Hu,Ruowang Liu,Weidong Xiang
Perovskite quantum dots (QDs) have become the star material for liquid crystal display (LCD). However, instability affects its practical application. Herein, CsPbBrI 2 quantum dots (CsPbBrI 2 QDs) with high quantum efficiency have been successfully precipitated in situ by adding CaO to the Li-Al-Si glass substrate. The photoluminescence quantum yield (PLQY) was adjusted from 64.5 % to 87.5 %. At the same time, we adopted a new strategy of blue light irradiation-stirred water washing. When blue light irradiation and stirred water washing interact synergistically, the naked CsPbBrI 2 QDs detached from the glass surface, while smaller CsPbBrI 2 QDs continued to grow. This process successfully resulted in CsPbBrI 2 QDs with high luminescence intensity and high stability. Moreover, when exposed to 60 °C, 90 % relative humidity (RH), and 2000 nit blue light for 240 hours (h), the treated sample could retain 91.1 % of the original emission intensity. The color gamut of the prepared CsPbBrI 2 @CsPbBr 3 @glass@polystyrene (PS) light conversion film covered 122 % of the NTSC 1953 standard and 90 % of the Rec. 2020 standard. It provided great value for the commercialization of QDs in backlight display applications.
研究领域:
材料科学
·
显示技术
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产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2021
·
IF 8.071
Lujian Lin,Shuai Tang,Xuesong Wang,Xuan Sun,Ying Liu
Microplastics (MPs) are becoming a major concern due to their great potential to sorb and transport pollutants in the aquatic environment ; hexabromocyclododecane (HBCD) is a common chemical additive in polystyrene (PS) MPs. However, the underlying mechanisms for the interaction of tetracycline (TC) onto HBCD-PS composites MPs (HBCD-PS MPs) are still not well documented. Our findings showed that the addition of HBCD resulted in a relatively higher hydrophobicity of PS MPs, and significantly enhanced the sorption ability of HBCD-PS MPs for TC. The kinetic models suggested that the sorption of TC onto PS and HBCD-PS MPs were mainly controlled by film diffusion and intra-particle diffusion, respectively. The statistical physics models were used to elucidate the sorption of TC onto PS and HBCD-PS MPs was associated with the formation of the monolayer, and the results indicated the TC was sorbed onto the two MPs by both multi-molecular and non-parallel processes. The TC sorption was solution pH-dependent while the effect of NaCl content on TC sorption was negligible. The presence of Cu(Ⅱ), Pb(Ⅱ), Cd(Ⅱ), and Zn(Ⅱ) ions had different influences on the TC sorption onto both the MPs. Overall, various mechanisms including π-π and hydrophobic interactions jointly regulated the sorption of TC onto both the MPs. Our results provided new insights into the sorption behavior and interaction mechanisms of TC onto both the MPs and highlighted that the addition of HBCD likely increased the enrichment capacity of MPs for pollutants in the environment.
研究领域:
环境科学
·
污染生态学
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Lingli Zhang,Chunjuan Huang
The equilibrium solubility of 6-bromo-2-methylquinoline in various binary blends [ethanol/isopropanol/N,N-dimethylformamide (DMF)/methanol + water] and ten monosolvents (methanol, ethanol, n-propanol, isopropanol, ethyl acetate, toluene, acetone, acetonitrile, DMF, and water) was studied by the isothermal method at 278.15–323.15 K under 101.2 kPa. Among the ten pure solvents, the maximum solubility in mole fraction was obtained in toluene (3.318 × 10–2), followed by ethyl acetate (2.991 × 10–2), acetone (2.764 × 10–2), acetonitrile (2.528 × 10–2), DMF (2.220 × 10–2), n-propanol (9.141 × 10–3), isopropanol (8.123 × 10–3), ethanol (3.896 × 10–3), methanol (9.981 × 10–4), and water (2.888 × 10–5) at 323.15 K. In four solvent mixtures, the maximum and minimum solubilities were obtained in the (DMF + water) and (methanol + water) blends. The solubility of 6-bromo-2-methylquinoline in pure solvents was only affected by temperature and calculated by the Apelblat, van’t Hoff, and NRTL models. The Jouyban–Acree (J–A), van’t Hoff–Jouyban–Acree (V–J–A), and modified Apelblat–Jouyban–Acree (A–J–A) models were used to evaluate the solubility data in mixed systems. The calculation of solvent effect deeply explored the dissolution behavior of 6-bromo-2-methylquinoline from the molecular point of view, and the results showed that the interaction between the solute and solvent was dominant. The apparent thermodynamic properties of 6-bromo-2-methylquinoline in pure solvents were obtained by van’t Hoff plots.
研究领域:
化学
·
物理化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）