Journal of the American Chemical Society
·
2013
·
IF 10.677
Yu Zou,Xiong Su,Jiang Jiang
Cu2ZnSnS4 (CZTS) nanocrystals with different morphologies and phases have been synthesized in hot organic solvents such as dodecanethiol and oleylamine. The crystallographic phases could be controlled by the sulfur precursor and the ligand species of the metal salts used for the synthesis. When a highly reactive sulfur precursor and metal acetates were used, wurtzite CZTS nanocrystals were obtained. On the other hand, using a low-reactivity sulfur precursor or metal chlorides produced CZTS nanocrystals in a kesterite phase. The experimental results from systematic investigations indicated that the reaction rate between Zn and S precursors played a determining role for the growth of CZTS nanocrystals with different crystalline phases. A relatively faster reaction between Zn and S precursors in comparison to the Sn–S reaction favored the formation of a metastable wurtzite phase, which could be accelerated by increasing the reactivity of the S precursor. This work provided a safe and economical way to synthesize high-quality phase-controlled Cu2ZnSnS4 nanocrystals, especially wurtzite nanorods, for potential photovoltaic applications. Moreover, preliminary results show that the proposed mechanism also applies to the phase-controlled synthesis of other quaternary Cu2MSnS4 (M = Cd2+, Mn2+) nanocrystals.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Beibei Liu,Xiaohua Ren,Long Chen,Xiaoxin Ma,Qiong Chen,Qidi Sun,Lin Zhang,Pengchao Si,Lijie Ci
High efficient adsorption of radioiodine in nuclear waste has attracted extensive attentions all over the world. In this work, we fabricated sulfur and nitrogen co-doped graphene aerogels (SN-GA) through one-step hydrothermal method, and investigated its iodine adsorption behavior including adsorption kinetics and isotherms in water. Our results reveal that SN-GA exhibits a 3D porous architecture with thiophene-S, oxidized-S, pyridine-N, pyrrole-N and graphite-N co-doped into the sp 2 carbon frameworks. The adsorption experiment showed SN-GA has a maximum iodine adsorption capacity of 999 mg g −1 determined by Langmuir isotherm, and the adsorption process could be better described by the pseudo-second-order model.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Yanchun Yang,Xiaojiao Kang,Lijian Huang,Daocheng Pan
Alkali metal doping plays a crucial role in fabricating high-performance Cu(In,Ga)(S,Se)2 and Cu2ZnSn(S,Se)4 (CZTSSe) thin film solar cells. In this study, we report the first experimental observation and characterizations of the alloyed LixCu2–xZnSn(S,Se)4 thin films. It is found that Cu+ ions in Cu2ZnSn(S,Se)4 thin films can be substituted with Li+ ions, forming homogeneous LixCu2–xZnSn(S,Se)4 (0 ≤ x ≤ 0.29) alloyed thin films. Consequently, the band gap, conduction band minimum, and valence band maximum of LixCu2–xZnSn(S,Se)4 thin films are profoundly affected by Li/Cu ratios. The band alignment at the LixCu2–xZnSn(S,Se)4/CdS interface can be tuned by changing the Li/Cu ratio. We found that the photovoltaic parameters of the LixCu2–xZnSn(S,Se)4 solar cell devices are strongly influenced by the Li/Cu ratios. Besides, the lattice constant, carrier concentration, and crystal growth of LixCu2–xZnSn(S,Se)4 thin films were studied in detail.
研究领域:
材料科学
·
太阳能技术
·
半导体物理
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 36
·6019-6025
·
IF 3.117
Junli Wang,Fan Guan,Lijun Zhao,Longhua Li,Junhao Zhang,Tingting Wang
Composition engineering is an active topic of research for optical and electronic (nano)crystals and functional materials. We here demonstrate the control over the ratios and distributions of selenium and sulfur in ternary Sb2(Se,S)3 alloy nanorods (NRs), which were synthesized from a molecular chalcogen precursor, selenium disulfide (SeS2). By increasing the anion/cation precursor ratios (SeS2/SbCl3) from 0.5 : 1 to 1 : 1 and 1.5 : 1, an increase in both the Se fractions and the lengths × diameters of NRs is achieved with the Se and S distributions in Sb2(Se,S)3 varying from homogeneity to inhomogeneity. Within the inhomogeneous NRs obtained at high SeS2/SbCl3 ratios containing excessive chalcogen (Se + S), S decreases but Se increases from the center to the periphery as revealed by EDS elemental analyses performed on individual NRs. In particular, the 1D growth anisotropy of NRs allows for a large chalcogen concentration gradient along the axial direction of the resulting NRs from their middle to the two ends. Such non-uniform Se and S distributions can be rationally interpreted by analyzing the growth kinetics and processes of Sb2(Se,S)3 NRs and would give rise to uncommon (opto)electronic properties towards future nanowire-based devices.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19
Yifan Yuan,Kunpeng Zhao,Qingyong Ren,Haotian Gao,Yuxiang Zhan,Tian-Ran Wei,Ting Zhang,Xun Shi
Flexible thermoelectric materials offer a promising route toward self-powered wearable electronics. The emergence of ductile inorganic semiconductors opens a new paradigm for flexible TE technologies, yet their thermoelectric performance remains far from optimal. Herein, we reveal a pronounced phase-transition hysteresis in the Ag 2 (S, Se, Te) system, where the transition temperature during cooling is 20–40 K lower than that during heating. Leveraging this hysteresis behavior, we successfully stabilize different structural phases at ambient conditions simply by varying the thermal treatment protocol. Compared to the monoclinic phase obtained by slow cooling from high temperature, the orthorhombic phase obtained by liquid-nitrogen treatment exhibits worse plastic deformation but much better electrical transport. A maximum power factor of ∼16 µW cm −1 K −2 and a zT of ∼0.5 near room temperature are achieved in the orthorhombic phase, both of which surpass most reported Ag-based ductile thermoelectric materials. This work provides a new pathway for designing high-performance ductile thermoelectrics.
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2026
·
IF 9
Xun Wang,Xiaolong Kong,Weisheng Wang,Ziwei Jing,Fei Wang,Zhiguo Wang,Xun Li
Optically pure linalool with (R)- and (S)-configurations is a pivotal chiral building block in the flavors and fragrances industry as well as in sustainable crop protection. However, current production of (R)- and (S)-linalool relies on plant extraction, which is severely restricted by the spatiotemporal differences in enantiomer distribution, leading to low yields and complex downstream separation processes. Herein, we developed a practical two-step batch resolution process based on the stereoselective linalool dehydratase-isomerase (LDI), isolated from Castellaniella defragrans strain 65Phen. Using the racemic linalool as substrate, (R)-linalool was obtained in the first batch, accompanied by the dehydration of (S)-linalool to β-myrcene. After fractional distillation, β-myrcene was stereoselectively hydrated back to (S)-linalool by LDI in the second batch. To overcome the thermodynamic constraints of enzymatic reactions and enhance the productivity, we further developed an in situ product removal strategy via selective adsorption using XAD-4 resin, which shifted the reaction equilibrium toward the formation of (S)-linalool and enhanced the hydration efficiency by 28.1-fold. Moreover, employing immobilized cells LDI@de-GA, we obtained 9.9 g of (R)-linalool with 98.0% enantiomeric excess (ee) value and 9.2 g of (S)-linalool with 97.3% ee from 20 g of racemic linalool, corresponding to a combined isolated yield of 95.5%. This work represents the first enzymatic resolution of linalool and establishes an environmentally friendly and sustainable approach for the synthesis of chiral linalool.
✓ 已验证
DOI
PubMed
高影响因子
ORGANIC PROCESS RESEARCH & DEVELOPMENT
·
2020
·
IF 3.023
Hong-Yi Wang,Jia-Wei Tang,Peng Peng,Hai-Jun Yan,Fu-Li Zhang,Shao-Xin Chen
We first developed a novel and efficient chemoenzymatic process to prepare (S)-1-(pyridin-4-yl)-1,3-propanediol, a vital HepDirect prodrug intermediate, from inexpensive and commercially available isonicotinic acid. Through this process, we provide a creative way to obtain the key chiral intermediate, β-hydroxyester, with ketoreductase (KRED) EA. After optimization of the process, we performed the reaction on a 100 g scale with a substrate concentration of up to 150 g/L, a yield of 93%, and an ee value of up to 99.9%. Additionally, we used a simple and effective NaBH4/MgCl2 reduction system to obtain (S)-1-(pyridin-4-yl)-1,3-propanediol with >99.9% ee and an 80% yield. This novel chemoenzymatic process has the potential to be a cost-effective and environmentally friendly process suitable for industrial use.
研究领域:
生物化学
·
制药工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 34
·18477-18487
·
IF 12.732
Menghua Yang,Xuewei Wang,Jinfeng Wu,Yue Tian,Xingyu Huang,Ping Liu,Xianyang Li,Xinru Li,Xiaoyan Liu,Hexing Li
Lithium sulfur (Li–S) batteries have been investigated as ideal candidates for future high-density energy storage systems with the advantages of abundant reserves, high energy density and competitive cost. The key issues are the severe shuttling of polysulfides and sluggish redox kinetics. Herein, we report a novel metal–organic framework-derived Co2P–ZnS/ZnS–C nanocomposite constructed from inner Co2P–ZnS and outer ZnS–C heterostructures. Both the experimental results and theoretical calculations demonstrated that these dual electrocatalytic heterostructures enabled strong affinity with polysulfides and facilitated the reaction kinetics. Meanwhile, the hollow carbon polyhedron provided fast electron/ion transfer channels and effectively buffered volume expansion during cycling. As anticipated, a high initial capacity of 1503 mA h g−1 was achieved at 0.2C with Co–Zn/Zn–C/S as a cathode, together with excellent stability after 500 cycles at 1C. Even a high reversible capacity of 540 mA h g−1 was achieved at 1C after 200 cycles under an elevated sulfur loading of 3.65 mg cm−2. This work presents a new strategy for designing dual electrocatalytic hosts for immobilization and conversion of polysulfides, which may offer more opportunities as cathodes in stable Li–S batteries with high energy density.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Green Chemical Engineering
·
2023
·
IF 0
Ying Jin,Shengxin Chen,Ruirui Wang,Yumei Liu,Xinxin Li,Yingwei Li,Ruirui Zhang,Ruixia Liu
Poly(ionic liquids) (PILs) combined with the macromolecular structure and unique properties of ionic liquids show unlimited potential in catalysis. In this work, a series of metal-based PIL with different ionic ratios were prepared for the selective oxidation of cyclohexane. Characterization analysis reveals that different degrees of ionization could adjust the Co–N sites of the catalysts efficiently, leading to significant changes in their electronic structure, which strongly relate to catalytic performance in oxidation. 20.07% cyclohexane conversion and 13.06% cyclohexanone and cyclohexanol (KA oil) yield can be achieved by metal-based PILs that are better than other commercial catalysts. Compared with CoCl 2 , metal-based PILs perform well, with superior conversion and KA oil yield. More interestingly, the catalyst created in this study features a malleable Co–N site, which may potentially have an impact on how oxygen species adsorb and desorb from the catalyst. Therefore, the catalyst studied in this work is used as molecular oxygen for the selective oxidation of cyclohexane to produce KA oil, and its application prospect is promising.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
CHINESE SCIENCE BULLETIN
·
2013
·Vol. 58
·期 11
·1262-1266
·
IF 1.319
Wang Jing,Liu ZhengPing
Poly(aryl ether ketone)s (PAEKs) were successfully synthesized via nucleophilic aromatic substitution (S N AR) mechanism, using ionic liquids as green reaction media. The influence of various reaction parameters including monomer concentration, dehydration time, polymerization temperature and duration, IL’s cations and anions nature, upon PAEKs molecular weight was investigated. In addition, the peculiarities of hydrogen-bonding ability of ILs were investigated. The interaction of 2,2-bis(4-hydroxyphenyl) propane (bisphenol A) with ILs has a strong influence on PAEKs synthesis. Various moderate molecular weight PAEKs have been obtained in high yields with molecular weights ranging from 10000 to 18000 g mol −1 .
研究领域:
高分子化学
·
绿色化学
·
材料科学
·
有机合成
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Qinhua Gu,Yujie Qi,Wuxing Hua,Tongxin Shang,Junnan Chen,Luozhen Jiang,Lina Li,Ming Lu,Yixiao Zhang,Xi Liu,Ying Wan,Bingsen Zhang
The shuttle effect caused by soluble lithium polysulfides (LiPSs) deteriorates multiphase transformation reaction kinetics of sulfur species, and gives rise to an unserviceable lithium-sulfur (Li-S) battery. Catalysis, as a process optimization approach, offers an option to eliminate the intrinsic issues. However, exploring and understanding the role of catalysts on electrode reaction remains critical bottlenecks, particularly as they are prone to continuous evolution under complex dynamic environment. Herein, platinum nanoparticles loaded on MXene nanosheets, as sulfur host, and the action of catalysts on the reaction process are investigated via ex-situ monitors upon solid–liquid–solid chemical transformation of sulfur species. These traces confirm that the high performance originates from electron transfer between catalysts and LiPSs, which lowers the nucleation barrier from liquid LiPSs to solid Li 2 S/Li 2 S 2 . Further, the accelerated liquid–solid conversion can alleviate the accumulation of LiPSs, and boost the reaction kinetics in Li-S batteries. The findings corroborate the electronic modulation between catalysts and LiPSs, which is a generalizable strategy to optimize energy conversion efficiency of Li-S batteries.
研究领域:
电化学
·
能源材料
·
纳米催化
·
电池化学
·
表面科学
✓ 已验证
DOI
高影响因子
Energy Materials
·
2023
·Vol. 3
·期 1
·N
·
IF 0
Xin Liang,Dongqing Zhao,Lulu Wang,Qianqian Huang,Chonghai Deng,Lili Wang,Lei Hu,Sheng Liang,Huaxia Deng,Hongfa Xiang
A gelatin-based nanofiber separator doped with C60 and ZIF-67 was constructed by electrostatic spinning of two different solutions. It can be used as a multifunctional separator for Li-S batteries.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
·
高分子材料
✓ 已验证
DOI
危险品化学品经营许可证（带存储）