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.
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DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Benlin Dai,Xin Chen,Xiaofan Yang,Gang Yang,Shijie Li,Lili Zhang,Feihu Mu,Wei Zhao,Dennis Y.C. Leung
A novel S-scheme Au/g-C 3 N 4 /BiO 1.2 I 0.6 plasmonic heterojunction was constructed by calcining a mixture of flower-like BiOI and Au/g-C 3 N 4 nanosheets for the first time. This Au/g-C 3 N 4 /BiO 1.2 I 0.6 heterojunction exhibited excellent photocatalytic activity in bisphenol AF (BPAF) degradation and Cr(VI) reduction with high cycle stability under visible light irradiation. In particular, the photocatalytic performance of the optimum material developed (4-Au/g-C 3 N 4 /BiO 1.2 I 0.6 ) can reach 0.0174 min −1 (apparent rate of BPAF degradation) and 0.0204 min −1 (apparent rate of Cr(VI) reduction), which were 6.5 and 3.7 times that of pristine g-C 3 N 4 , respectively. The high photocatalytic performance was due to the high efficiency of charge separation, the excellent light absorption of localized surface plasmon resonance (LSPR) caused by the Au deposition, and the formation of S-scheme heterojunctions, which maintained strong photocatalytic reduction and oxidation activity. Noticeably, the charge density difference and band offsets of the g-C 3 N 4 /BiO 1.2 I 0.6 were calculated. The results revealed that an internal electric field (IEF) was created, which further demonstrated the formation of an S-scheme photocatalytic mechanism.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xin Wang,Zhurong Liang,Xueqing Xu,Nan Wang,Jun Fang,Junxia Wang,Gang Xu
Highly Cu-rich copper indium sulfide (CuInS 2 , CIS) quantum dots were synthesized utilizing copper chloride (CuCl) and indium acetate (In(Ac) 3 ) as metal cation precursors, combined with n-dodecanethiol (DDT) as a coordinating sulfur source and solvent. With excess of In(Ac) 3 , i.e. with Cu/In ratios of 1/4, together with Zn 2+ ions post-treatment, a relatively high photoluminescence quantum yield (QY) of ∼73% with long average lifetime of ∼359 ns has been obtained, which is proposed to be attributed to the Cu-rich defect states in the CIS nanocrystals (NCs) nuclei. Meanwhile, the formation of In-rich CIS–ZnS alloy, i.e. Zn–Cu–In–S (ZCIS) with high density of Cu vacancies, combined with the surface passivation of ZnS overlay resulted in a high QY. Finally, the formation mechanism of the ZCIS/ZnS with Cu-rich nuclei has been proposed.
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 59
·期 13
·1434-1445
·
IF 0
Hongyu Jiang,Hanzhou Jiang,Guofei Chen,Xingzhong Fang
Two isomers of commercial 4,4′-(4,4′-isopropylidenediphenoxy) bis(phthalic anhydride) (4,4′-BPADA), that is, 3,4′-(4,4′-isopropylidenediphenoxy) bis(phthalic anhydride) (3,4′-BPADA) and 3,3′-(4,4′-isopropylidenediphenoxy) bis(phthalic anhydride) (3,3′-BPADA), were synthesized through aromatic nucleophilic substitution from nitrophthalonitrile and bisphenol A. 3,4′-BPADA was first synthesized from two intermediates, that is, 3-(4-[4-hydroxyphenylisopropylidene] phenoxy) phthalonitrile (3-BPADN) and 3,4′-(4,4′-isopropylidenediphenoxy) bis(phthalonitrile) (3,4′-BPATN). The corresponding three series of polyetherimides (PEIs) were prepared with two representative aromatic diamines (4,4′-oxydianiline and m -phenylenediamine ( m -PDA)) via two-step procedure and chemical imidization. Isomeric polyimides showed T g s from 206 to 256°C in nitrogen and T d5% s from 488 to 511°C in argon, good mechanical properties (tensile moduli of 2.3–3.3 GPa, tensile strengths of 70–96 MPa, and elongations at break of 3.2%–5.1%), and good solubility. With the introduction of 3-substituted phthalimide unit, PEIs displayed higher T g values, lower strengths and elongations, better solubility and larger d -spacings. The rheological properties of thermoplastic polyimide resins based on the BPADA isomers were investigated, which showed that polyetherimide PEI-3b derived from 3,3′-BPADA and m -PDA had the lowest melt viscosity among the isomers, indicating that the melt processibility had been greatly improved. Graphical
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DOI
Joule
·
2017
·
IF 0
Fei Pei,Lele Lin,Ang Fu,Shiguang Mo,Daohui Ou,Xiaoliang Fang,Nanfeng Zheng
Summary Lithium-sulfur (Li-S) batteries are a promising next-generation energy-storage system due to their high theoretical energy density and low cost. However, the rapid capacity fading of high-sulfur-loading cathodes caused by the shuttle of soluble polysulfide intermediates between two electrodes heavily hinders the development of high-energy-density Li-S batteries. We develop in this work a powerful functional separator to suppress the polysulfide shuttle by coating two-dimensional nitrogen-doped porous carbon nanosheets on one surface of a commercial polypropylene separator. The high surface area, high content of nitrogen dopants, and close-packing laminar structure of the two-dimensional porous carbon nanosheets make them ideal to fabricate a lightweight and thin separator for high-energy-density Li-S batteries. The separator reported in this work endows the high-sulfur-loading cathodes made of commercial carbon materials with significantly enhanced performances that are comparable with or even superior to the state-of-the-art sulfur composite cathodes, opening up new opportunities for designing practical high-energy-density Li-S batteries.
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DOI
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Tao An,Huanhuan Jia,Linfeng Peng,Jia Xie
Room-temperature solid-state sodium batteries have the remarkable potential to simultaneously achieve high safety, high energy density, and low cost. However, their current performance is far below expectations. Through material and interfacial modification based on Na3PS4 solid electrolytes, progress is made toward stable room-temperature solid-state sodium–sulfur (Na–S) batteries. First, the ionic liquid N-butyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (Pyr14FSI) is employed to modify the anode/electrolyte interface. An overpotential of 0.55 V after 900 h of a symmetrical battery indicates enhanced interfacial stability. A stable in situ solid electrolyte interphase layer is formed at the interface of NaSn alloy and Na3PS4, proved by X-ray photoelectron spectroscopy measurements. Furthermore, selenium-doped sulfurized polyacrylonitrile (Se0.05S0.95@pPAN) is used to boost the ionic and electronic conductivities of the sulfur cathode. As a result, the Na–S battery using a Se0.05S0.95@pPAN cathode and the interfacial modification delivers stable cycle performance and enhanced rate capability.
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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.
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DOI
POLYMER
·
2020
·
IF 4.231
Bin Shen,Hongting Pu
A new monomer , propargyl-1-methylimidazolium bromide, is synthesized. A series of poly(ether sulfone)s with pendent imidazolium (PES-Im-x) are synthesized from poly(ether sulfone)s with azide via nucleophilic polycondensation , bromination, and azidation, which are then reacted with propargyl-1-methylimidazolium bromide via click chemistry. The membranes are prepared sequentially via solution casting and ion exchange, which exhibit good alkaline stability under basic and elevated temperature conditions. The micro-phase separation of the membranes is observed on transmission electron microscopy . The conductivities of the membranes achieve in the range of 3.53 × 10 −2 to 5.76 × 10 −2 S cm −1 at 80 °C, which are related to the introduction of dense imidazolium groups on the side chains of the polymers. The designed structure facilitates the aggregation and transport of the ions in the membranes. The membrane electrode assembly based on PES-Im-38 with a power density of 18.0 mW cm −2 at 60 °C is obtained. In addition, all these membranes show good dimensional stability and thermal stability. It is demonstrated that click reaction may provide a viable strategy for the further preparation of high performance anion exchange membranes .
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DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Lulu Tian,Yuanping Huang,Chaoran Li,Shuang Chen,Jiayu Peng,Liyong Niu,Zhijun Zhang
Complex operating conditions pose greater challenges for lubricants, making the development of multi-functional additives a trend. This research introduces a multifunctional Cu-Mo-S nanoparticle (CMS) additive, synthesized using a unique one-pot in situ method. The CMS significantly improved the tribological performance and oxidation stability of base oils. Specifically, 0.5 wt% CMS manifested a remarkable reduction in the friction coefficient and wear volume of ester-based oils by 74.75% and 95.91%, accompanied by a noteworthy increase in the extreme pressure capabilities exceeding 50%, outperforming the individual copper nanoparticles, organic molybdenum, and their mixtures. The remarkable results are attributed to the distinctive structure of CMS, which decomposed during the friction process, forming a continuous friction film containing copper, molybdenum, and iron compounds.
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DOI
高影响因子
ENERGY
·
2025
·
IF 9.4
Naomie Beolle Songwe Selabi,Lukang Che,Mengdie Liu,Luozhi Mo,Yingke Zhou,Lesly Dasilva Wandji Djouonkep,Xiaohui Tian
Reducing electrochemical polarization is an efficient strategy to promote electrochemical reaction and increase battery performance. Herein, we develop a magnetic tuning strategy and investigate the influence of the electromagnetic properties of NiCo 2 O 4 on polarization and redox kinetics of Li-S battery. The electromagnetic properties of NiCo 2 O 4 are adjusted by controlling the nanowire dimension and crystalline size, where a series of relationships between electromagnetism and polysulfide conversion reactions are established. The built-in magnetic field in ferromagnetic NiCo 2 O 4 nanowire modulates the surface reactivity and diffusion pathway of negative species at the electrolyte/cathode interface for strong adsorption of LiPSs during cycles. The high dielectric properties of carbon cloth-supported NiCo 2 O 4 nanowire composite (NCO-CC) improve charge carriers/ions mobility and regulate the voltage at the electrolyte/cathode interface, enhancing the electrochemical performance of the battery. The optimized NiCo 2 O 4 -CC-based Li-S battery exhibits excellent initial specific capacity (1496.1 mAh g -1 at 0.1 C), high-rate capability (896.8 mAh g -1 at 1 C), and outstanding cycling stability (a decay of 0.019%/cycle after 1200 cycles at 1 C). A high areal capacity (10.4 mAh cm -2 at 0.1 C) is achieved at high sulfur loading (10.7 mg cm -2 ). This work provides new insights for tuning the magnetic properties of the cathode material to reduce polarization, mitigate polysulfide migration, and enhance the overall electrochemical performance of Li-S batteries.
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 19
·2000613
·
IF 16.836
Yusen He,Mingjun Li,Yongguang Zhang,Zhenzhen Shan,Yan Zhao,Jingde Li,Guihua Liu,Chunyong Liang,Zhumabay Bakenov,Qiang Li
The main obstacles that hinder the development of efficient lithium sulfur (Li–S) batteries are the polysulfide shuttling effect in sulfur cathode and the uncontrollable growth of dendritic Li in the anode. An all-purpose flexible electrode that can be used both in sulfur cathode and Li metal anode is reported, and its application in wearable and portable storage electronic devices is demonstrated. The flexible electrode consists of a bimetallic CoNi nanoparticle-embedded porous conductive scaffold with multiple Co/Ni-N active sites (CoNi@PNCFs). Both experimental and theoretical analysis show that, when used as the cathode, the CoNi and Co/Ni-N active sites implanted on the porous CoNi@PNCFs significantly promote chemical immobilization toward soluble lithium polysulfides and their rapid conversion into insoluble Li 2 S, and therefore effectively mitigates the polysulfide shuttling effect. Additionally, a 3D matrix constructed with porous carbonous skeleton and multiple active centers successfully induces homogenous Li growth, realizing a dendrite-free Li metal anode. A Li–S battery assembled with S/CoNi@PNCFs cathode and Li/CoNi@PNCFs anode exhibits a high reversible specific capacity of 785 mAh g −1 and long cycle performance at 5 C (capacity fading rate of 0.016% over 1500 cycles).
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Hong Fan,Lili Ai,Mengjiao Xu,Shumin Wu,Luxiang Wang,Chuan Tan
Photocatalytic synthesis of hydrogen peroxide is an emerging topic for solar-to-chemical energy conversion. ZnIn 2 S 4 /Bi 4 Ti 3 O 12 (ZIS/BTO) - based S-scheme heterojunction semiconductor photocatalysts were prepared via a one-pot water bath method. Under visible light irradiation, the optimum H 2 O 2 yield of ZIS/BTO-2 reaches 1102 µmol L −1 , which is 20.0 and 11.5 times higher than those of the pure phases of Bi 4 Ti 3 O 12 and ZnIn 2 S 4 , respectively. Experimental and density functional theory (DFT) calculations demonstrated that the Built-in Electric Field (IEF) present between the ZIS/BTO S-type heterostructures not only facilitated the transfer of photogenerated carriers to surface active sites, but also promoted the adsorption of molecular oxygen and the tuning of the energy band structure. This resulted in an enhancement of the efficiency of photocatalytic oxygen reduction reaction (ORR) and the water oxidation reaction (WOR) for the synthesis of H 2 O 2 . Hence, the present study provided a practical route for the efficient synthesis of H 2 O 2 over Bi 4 Ti 3 O 12 - based photocatalysts and disclosed the reaction mechanism, that is, a heterojunction with a high efficiency for H 2 O 2 synthesis.
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