ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Yanqing Cai,Hongxia Liu,Qian Xu,Qiushi Song,Liang Xu
The in-situ preparation of LiCl–KCl–ZrCl 4 melt was investigated by the replacement reaction between Zr and CuCl in LiCl–KCl melt at 500 °C, and the reaction progress was also investigated by a series of electrochemical techniques, such as cyclic voltammetry , square wave voltammetry and open circuit chronopotentiometry . The electrochemical signals show that the concentration of Zr(IV) ions increases gradually and then reaches to the maximum value with the reaction time increasing from 0 to 180 min, while the concentration of Cu(I) ions decreases rapidly and drops to below the detection limit of the electrochemical tests. Meanwhile, the concentrations of Cu and Zr ions in the melt were determined over time by chemical analysis in the course of reaction. The results are in good agreement with the electrochemical tests. Finally, LiCl–KCl melts with (0.837 wt.% ∼ 1.709 wt.%) ZrCl 4 are obtained, and the final concentration of Cu(I) in the melt has dropped to below 0.025 wt.% when the reaction lasted for 180 min.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2014
·
IF 2.733
Hao Ma,Rui Zhang,Xianghai Meng,Zhichang Liu,Haiyan Liu,Chunming Xu,Rentan Chen,Peter A. A. Klusener,Jan de With
Composite ionic liquid (CIL) prepared from triethylamine hydrochloride, anhydrous aluminum(III) chloride, and cuprous chloride is a new catalyst for isobutane alkylation. This composite ionic liquid alkylation (CILA) technology yields an alkylate with favorable product distribution. CILA is a promising replacement for sulfuric acid and hydrofluoric acid alkylation technologies. However, some solids are formed during alkylation, and solid amount increases with time on stream. In a number of separation steps, the used CIL was divided into liquid and solid. Nuclear magnetic resonance, X-ray diffraction, X-ray photoelectron spectroscopy, and elemental analyses were applied to characterize these fractions. The content of acid-soluble oil (ASO) in solid was also investigated. The results showed that the solid was mainly cuprous chloride and contained about 1 wt % ASO. The loss of aluminum chloride and detachment of CuCl as a form of solid from CIL resulted in the decrease of CIL acidity and product selectivity.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2021
·Vol. 35
·期 7
·e6245
·
IF 4.105
Ruonan Ma,Zhiyin Xiao,Wei Zhong,Chunxin Lu,Zhongquan Shen,Dan Zhao,Xiaoming Liu
Cuprous halides, best described as (CuX) n (X = Cl − , Br − , and I − ) in their solid state, catalyse selective aerobic oxidation of alcohols with the assistance of both NMI ( N -methylimidazole) and TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl), and the iodide generally demonstrates the highest activity, for example, in the oxidation of 1-octanol at ambient temperature under 24 h' reaction. However, in the aerobic oxidation of benzylic alcohols, the chloride showed superiority to the iodide in that the aerobic oxidation was quantitatively completed within 3 h at ambient temperature whereas the iodide showed only about half the activity of the chloride analogue. By probing the system using electrochemistry, electric conductivity, and 1 H NMR titration, it was revealed that the surprising anomaly was due to the difference in the rate of forming active species, [Cu (NMI) 2 X(MeCN)], from the polymeric solid in a two-stage process. Substrates expansion of 11 benzylic alcohols indicated that CuCl/NMI/TEMPO system demonstrated quantitative conversion of benzylic alcohols into corresponding aldehydes within 3 h and showed great tolerance to the substituents on the phenyl ring of the substrates. Furthermore, electron-withdrawing substituent was beneficial to the oxidation and could offset the steric effect at orthro -substituent. Such a behaviour suggested that in the catalysis, increasing the acidity of the hydroxyl group (OH) of the substrates could ease the oxidation, which implied that the deprotonation via an internal pathway might be one of the rate-determining steps. Our results also showed that the anion halide participated actively in the catalysis by coordinating to Cu(I) in the active species.
研究领域:
化学
·
催化反应
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2013
·Vol. 57
·期 3
·397-401
·
IF 1.327
Zhang QiBo,Hua YiXin,Wang Rui
Direct electroreduction of solid cuprous chloride to prepare copper powder in a “neutral” ambient-temperature ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid (BMIMBF 4 ) was investigated. Cyclic voltammetry of the CuCl powder in a Pt-powder cavity microelectrode exhibited that solid CuCl can be electrochemical reduced in the ionic liquid. Chronoamperometry of the salt powder filled Mo-cavity electrode (current collector) in the ionic liquid further demonstrated the conversion of chloride-to metal inside the cavity, as confirmed by scanning electron microscopy, energy-dispersive X-ray, and X-ray diffraction spectra.
研究领域:
电化学
·
材料科学
·
无机化学
·
绿色化学
·
冶金工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Jiaxin Zhang,Lu Wang,Zhiqiang Ma,Chuanjun Di,Guanghui Chen,Jipeng Dong,Jianlong Li,Fei Gao
CuCl-based catalysts are the most commonly used catalysts for the “direct synthesis” of trimethoxysilane (M3). CuCl species are sensitive to air and water, and are prone to oxidation deactivation. When CuCl is directly used as a catalyst, it needs to be purified before the utilization, and the operating conditions for the catalyst preparation are relatively harsh, requiring the inert gas environment. Considering a high-temperature activation step required for CuCl-based catalysts used for catalyzing synthesis of M3 to form active phase Cu–Si alloys (Cu x Si) with Si powder, in this work, a series of catalysts for the “direct synthesis” of M3 were obtained by a one-step high-temperature activation of the mixture of stable CuCl 2 precursors, activated carbon-reducing agent, and Si powder, simultaneously achieving the reduction of CuCl 2 to CuCl and the formation of active phase Cu x Si alloys of CuCl with Si powder. The prepared samples were characterized through various characterization techniques, and investigated for the catalytic performance for the “direct synthesis” of M3. Moreover, the operation conditions were optimized, including the activation temperature, catalyst dosage, Si powder particle size, and reaction temperature. The characterization results indicate that during the one-step activation process, the CuCl 2 precursor is reduced to CuCl, and the resulting CuCl simultaneously reacts with Si powder to form active phases Cu 3 Si and Cu 15 Si 4 alloys. The optimal catalyst S acm (250, 0.8:10) exhibits a good catalytic activity with selectivity of 95% and yield of 77% for M3, and shows a good universality for various alcohol substrates. Furthermore, the catalytic mechanism of the prepared catalyst for the “direct synthesis” of M3 was discussed.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Molbank
·
2024
·Vol. 2024
·期 2
·M1828
·
IF 0.6
Zhongwei Wang,Lin Song,Yukun Qin
This study aims to develop an efficient and green one-pot method for the synthesis of 6-en-1-yl furan-2-carboxylic acid heptyl ester. Initially, using furfural as the starting substrate, hept-6-en-1-yl furan-2-carboxylate was prepared using a one-pot method. This study developed a new experimental scheme for preparing ester compounds, using cuprous chloride as a catalyst and tert butyl hydrogen peroxide as an oxidant to prepare furoic acid. Without the need for intermediate treatment, the target product can be directly obtained from furfural by adding 7-bromo-1-heptene, TBAB, and potassium carbonate. This method effectively utilizes furfural as a platform chemical, demonstrating its potential for synthesizing high-value chemicals. The entire synthesis process is simple and efficient, following the principles of green chemistry.
研究领域:
有机化学
·
绿色化学
·
合成化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 23
·2400762
·
IF 8
Wentao Niu,Xiulin Xie,Zhong Chen,Ruixin Sun,Yu Li,Shuaibing Wang,Yu Zhang,Chunhe Yang,Aiwei Tang
Recently, I-III-VI type quantum dots (QDs) have attracted considerable attention in display technology due to their large-scale tunable emission and environmentally friendly characteristics. However, within this family, narrow-bandwidth Cu-based QDs have rarely been reported. Herein, the synthesis of narrow-bandwidth blue-emitting Cu-Ga-S (CGS)-based QDs is reported by a hot-injection method for the first time, boasting a narrow full width at half-maximum (FWHM) of 29 nm, closely approaching that of traditional Cd-based QDs. Through precisely controlling the temperature of nucleation stage, CGS-based QDs showcase a representative blue emission at 475 nm, featuring the narrowest FWHM and a photoluminescence quantum yield (PLQY) of 32%. Besides, the femtosecond transient fluorescence (fs-TA) characterization indicates that the narrow-bandwidth luminescence is attributed to band-to-hole recombination rather than donor-acceptor pair (DAP) recombination. The work opens a new avenue for narrow-bandwidth I-III-VI QDs, offering increased potential for applications in blue-light-emitting devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 35
·2401330
·
IF 13
Yingfen Li,Yue Jian,Fang Huang,Nian Zhou,Wanqiu Chai,Juguang Hu,Jun Zhao,Zhenghua Su,Shuo Chen,Guangxing Liang
Cu 2 ZnSn (S,Se) 4 (CZTSSe), a promising absorption material for thin-film solar cells, still falls short of reaching the balance limit efficiency due to the presence of various defects and high defect concentration in the thin film. During the high-temperature selenization process of CZTSSe, the diffusion of various elements and chemical reactions significantly influence defect formation. In this study, a NaOH-Se intermediate layer introduced at the back interface can optimize Cu 2 ZnSnS 4 (CZTS)precursor films and subsequently adjust the Se and alkali metal content to favor grain growth during selenization. Through this back interface engineering, issues such as non-uniform grain arrangement on the surface, voids in bulk regions, and poor contact at the back interface of absorber layers are effectively addressed. This method not only optimizes morphology but also suppresses deep-level defect formation, thereby promoting carrier transport at both interfaces and bulk regions of the absorber layer. Consequently, CZTSSe devices with a NaOH-Se intermediate layer improved fill factor, open-circuit voltage, and efficiency by 13.3%. This work initiates from precursor thin films via back interface engineering to fabricate high-quality absorber layers while advancing the understanding regarding the role played by intermediate layers at the back interface of kesterite solar cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Shi-Wei Fu,Jian Yang,Zong-Yan Zhao,Bao-Feng Shan,Jia-Xin Zhang,Jin Zhang,Qingju Liu,Jianyong Feng,Zhaosheng Li,Zhigang Zou
A profound understanding of the band-edge electronic structure is crucial for advancing the development of highly efficient photocatalytic materials and unraveling the underlying mechanisms. This study employs a unified and consistent assessment protocol, offering a systematic exploration of the inherent connections between the band-edge electronic structure and the photo(electro)catalytic performance of a series of delafossite ABO2 compounds (A = Cu, Ag; B = Al, Ga, In). These compounds exhibit characteristics of indirect bandgap semiconductors, with fundamental and optical bandgaps spanning from 1.45 to 3.57 eV. Notably, the Cu-based ABO2 compounds display a significantly larger fundamental bandgap and excel as photocathode materials when the B-site element is held constant. Among these, CuInO2 emerges as the most promising candidate, showcasing superior photo(electro)catalytic performance. Extensive density functional theory calculations unravel intricate insights into the interplay between the band-edge electronic structure and valence orbital hybridization of the A- and B-site elements, providing invaluable perspectives for comprehending and enhancing the photo(electro)catalytic performance of such compounds. The findings in this study not only establish robust theoretical foundations for integrating ABO2 compounds into the field of photo(electro)catalysis but also lay the groundwork for future material design and optimization.
研究领域:
材料科学
·
催化
·
光化学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Ying Zhang,Xin Liu,Yonggang Zhao,Zhineng Zhou,Yufei Chen,Congyan Xu,Xinghuan Hu,Xu Su,Lang Wu,Xiaoyu Jin,Shurong Wang
In recent years, there is significant interest in Cu 2 SnS 3 (CTS) thin film solar cells owing to the eco-friendly nature and abundant elemental composition. However, the efficiency prepared in laboratory settings for these solar cell remains relatively low, primarily due to serious open-circuit voltage losses. Cation substitution is one of the strategies to alleviate this problem. In this work, Ag and Ge dual-cation substitution in CTS is proposed, which occupy partial Cu and Sn lattice sites respectively. Investigation reveals that substituting Cu with part Ag increases the band gap slightly, promotes grain growth, and improves crystallinity of CTS films. Simultaneously, Ge incorporation shifts the conduction band upwards to some extent, while reducing grain boundaries, due to increasing the grain size. As a result, the incorporation of 6 % Ag resulted in an optimal efficiency (PCE) of 2.78 %. Furthermore, employing dual-cation substitution with 6 % Ag and 6 % Ge is employed, the CTS device achieved an optimal efficiency of 3.15 %. This work develops the synergistic effect of Ag and Ge dual-cation substitution in CTS device and confirms that this approach can improve device performance, thus providing new research ideas for advancing the development of CTS device.
研究领域:
材料科学
·
太阳能电池研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FLUORINE CHEMISTRY
·
2025
·
IF 1.9
Zihan Ai,Baohe Wang,Zhaobang Zhang,Bangxing Yin,Jing Zhu,Jing Ma
The fluorine-containing compound with symmetrical structure (I-C 2 H 4 -(CF 2 ) n -C 2 H 4 -I) is a widely used the intermediate of fluorine-containing copolymer having various applications in the organic fluorine chemical industry. Herein, the addition reaction of 1,6-diiodoperfluorohexane (I-C 6 F 12 -I) with ethylene was studied at different temperatures (130 to 170 °C), reaction time (4 to 12 h), solvents (acetonitrile, DMF, Py, n-hexane) and initiators (AIBN, DTBP, CuI, CuCl). The yield of the product (I-C 2 H 4 C 6 F 12 C 2 H 4 -I) was up to 73 % under optimal reaction conditions (150 °C, 10 h, CuI, acetonitrile). The kinetic equation of the reaction was derived through further studies on the reaction kinetics. The addition reaction is a consecutive reaction, the reaction order and the activation energy of the first step (I-C 6 F 12 -I to I-C 6 F 12 C 2 H 4 -I) are 1.131 and 56.53 kJ mol -1 , and the reaction order and the activation energy of the second step (I-C 6 F 12 C 2 H 4 -I to I-C 2 H 4 C 6 F 12 C 2 H 4 -I) are 0.479 and 49.81 kJ mol -1 . These are important results that allows for further process intensification and designing of reactor.
研究领域:
有机化学
·
材料科学
·
工业化学
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2024
·Vol. 16
·期 11
·1504
·
IF 3
Dongyang Zhang,Kunfu Li,Lei Fang,Huishan Chen
In this research, the CuFeS2/MXene-modified polyvinylidene fluoride (PVDF) membrane was prepared to activate peroxymonosulfate (PMS) to remove moxifloxacin (MOX) and its morphology; surface functional groups and hydrophilicity were also studied. The parameters of the catalytic membrane/PMS system were optimized, with an optimal loading of 4 mg/cm2and a PMS dosage of 0.20 mM. High filtration pressure, alkaline conditions, and impurities in water could inhibit MOX removal. After continuous filtration, the removal efficiency of MOX using the catalytic membrane/PMS system and PVDF membrane was 68.2% and 9.9%, respectively. Batch filtration could remove 87.8% MOX by the extra 10 min contact time between the catalytic membrane and solution. During the filtration process, CuFeS2/MXene on the surface of the catalytic membrane activated PMS to produce SO4•−, HO•, and1O2, and MOX was removed through adsorption and degradation. Taking humic acid (HA) as the model foulant, reversible fouling resistance in the catalytic membrane/PMS system was 22.8% of the PVDF membrane. The catalytic membrane/PMS system weakened the formation of the cake layer by oxidizing HA into smaller pollutants and followed the intermediate blocking cake filtration model. The novelty of this research was to develop a CuFeS2/MXene–PVDF membrane-activated PMS system and explore its application in antibiotics removal.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）