LANGMUIR
·
2025
·
IF 3.9
Xiaowei Ma,Lin Tan,Jiaqi Xu,Jiaoyang Hao
Metal–organic frameworks (MOFs) exhibit highly adjustable porosity, structure, and versatility, properties that render them promising for electromagnetic wave (EMW) absorption applications. However, the impedance matching of these composites is poor in practical applications, thereby compromising their EMW absorption performance. In this study, a novel EMW absorbing composite was synthesized by a solution-thermal method combined with a subsequent pyrolysis process. Specifically, we introduced heteroatom (N and S) codoped graphene (N, S-Gr) into the Co–Ni MOF, forming N, S-Gr/CoNi/C. Graphene was endowed with abundant defect and disorder sites through the codoping of nitrogen and sulfur, which enhanced interfacial polarization and dipole polarization. When nickel and cobalt were added in a 1:1 ratio, the minimum reflection loss (RLmin) of the N, S-Gr/Co–Ni/C composite reached −47.7 dB at 4.24 GHz, and the resultant material exhibited the best absorption properties. As a result, this composite is considered to be an ideal candidate for the development of highly effective EMW absorbers.
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高影响因子
Catalysis Science & Technology
·
2024
·Vol. 14
·期 3
·667-672
·
IF 4.4
Qiulan Huang,Ruiqin Ren,Jia Li,Muhammad Waqas,Pan Chen,Xiaotian Liu,Dujuan Huang,Zhongyun Yang,Xinglan Peng,Du-Hong Chen,Youjun Fan,Wei Chen
Fabricating highly competent and cost-effective catalysts is essential for promoting the sluggish kinetics associated with the oxygen reduction reaction (ORR). Herein, a new type of Fe, Co decorated porous carbon composite catalyst co-doped with S and N (FeCo–SNC) was prepared by a simple carbonization process. Interestingly, FeCo–SNC inherits not only the pore structure but also the large surface area of the ZIF-67 dodecahedron. Furthermore, the electronic configuration of the two catalytic centers in Fe–N–C and Co–NC was customized. On the basis of synergetic coordination between the two active sites, the fabricated FeCo–SNC showed prior stability for the ORR even after 10 000 cycles of cyclic voltammetry measurement, besides the great limiting current density of 5.99 mA cm−2 and high half potential of 0.856 V (vs. reversible hydrogen electrode), surpassing the commercially available Pt/C catalyst. Moreover, the primary active site of Fe–N–C was regulated, providing the highest catalytic activity for the ORR. This research offers a new perspective on enhancing carbon-based catalysts for the ORR without relying on precious metals and introduces a strategic method for controlling active centers.
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高影响因子
Nanoscale
·
2024
·Vol. 16
·期 36
·17009-17023
·
IF 5.8
Congcong Wang,Suili Shi,Boya Liu,Guorong Wang,Zhiliang Jin
Rational design and synthesis of a unique heterojunction photocatalyst structure is an important strategy to enhance its performance and structural stability. Herein, Co9S8/MnCdS/Co3O4 photocatalysts with double S-scheme heterojunctions were successfully prepared by coupling Co9S8 and Co3O4 sheet structures with n-type MnCdS nanoparticles through a simple solvothermal and mechanical mixing method. The construction of the dual S-scheme heterostructure offers the possibility to expand the light absorption range, extend the carrier lifetime and maximise the redox capacity. In addition, the mechanism of charge transfer and the reason for the improvement of photocatalytic activity were explored through photoelectrochemical characterization. The lamellar structures of Co9S8 and Co3O4 not only provide excellent dispersion and slow down the agglomeration of MnCdS nanoparticles, but also promote charge transfer, which improves the photocatalytic hydrogen production effect. Under simulated solar irradiation, the evolution rate of H2 after 5 h was as high as 46.44 μmol, which was 3.49 and 1.49 times higher than those of pristine MnCdS and MnCdS/Co3O4, respectively. Meanwhile, it has good stability under 20 h irradiation. This work demonstrates a novel idea for the rational design of double S-scheme photocatalysts with efficient space separation.
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高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Junchang Liu,Weijie Yuan,Minghui Zhu,Sivarasan Ganesan,Nikolai Ivanovich Vatin,Dafeng Zhang,Xue-Yang Ji,Xipeng Pu,Xinghui Liu
The widespread application of antibiotics, such as tetracycline (TC), has led to severe environmental problems. Herein, the rod-like Mn 0.3 Cd 0.7 S (MCS) coupled with flower-like FeNi 8 -LDH self-assembled from nanosheets S-scheme heterojunction is successfully constructed by a simple physical ultrasonic-assisted combined with a grinding method. The optimized MCS/30FeNi 8 -LDH heterojunction exhibits excellent photocatalytic degradation of TC under visible light with a removal rate of 72.5 % within 30 min along with excellent cycling stability, which enhanced 14.5 and 1.68 times compared to those of pristine FeNi 8 -LDH and MCS. The correlation between S-scheme heterojunction and photocatalysis performance clarify the rapidly transfer pathway of photogenerated carriers between MCS and FeNi 8 -LDH. The trapping experiment confirms •O 2 - and h + are the primary active species, with h + playing a dominant role in the degradation process. The enhanced photocatalytic degradation performance can be attributed to the formation of S-scheme heterojunction with well-matched band alignment, which remains the powerful reduction capability of generated electrons of FeNi 8 -LDH and more robust oxidation capability of photogenerated holes of MCS. This work not only provides a potential solution for photocatalysis degrading TC, but also expands the S-scheme heterojunction constructed strategy to the realm of energy storage and conversion .
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高影响因子
FUEL
·
2024
·
IF 6.7
Yan Wang,Xi Wu,Qiaoling Yang,Yuqi Zhao,Hengliang Wang,Arturo Pajares,Jinying Zhang,Jiahong Wang,Wai-Yeung Wong,Xin Wang
Designing ternary heterojunction photocatalysts is regarded as a compelling approach to attain exceptional photocatalytic activity. However, they always suffer from poor interfacial contact and unclear charge transfer pathways. Herein, a metal-free dual S-scheme heterojunction photocatalyst comprised of black phosphorus (BP), carbon nitride (CN), violet phosphorus (VP) was designed by electrostatic self-assembly. The non-metallic feature of the BPCNVP heterostructure facilitates to form strong interfacial contact by coordinating active P sites in VP and BP with N atoms in CN. Notably, a definite dual S-scheme heterojunction configuration is achieved by rational band alignment of VP and BP, respectively, which significantly boosts the driving force for charge separation. The BPCNVP heterostructure exhibited a hydrogen evolution rate of 1669μmol h -1 g −1 with excellent stability, surpassing most reported metal-free photocatalysts. This work demonstrates that the design of dual S-scheme heterojunction by metal-free materials provides valuable insights into the intricate reaction mechanism of ternary heterojunction photocatalysts.
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CRYSTENGCOMM
·
2016
·Vol. 18
·期 25
·4744-4748
·
IF 3.849
Wangen Zhao,Daocheng Pan,Shengzhong (Frank) Liu
Achieving micro-sized and closely packed grains is an essential requirement for high-performance chalcogenide thin film solar cells. Here, I2–II–IV–VI4 (Cu2MnSn(S,Se)4) (CMTSSe) thin films were successfully deposited by carrying out a simple, degradable solution-based process. The structure, composition, and morphology were characterized by powder X-ray diffraction (XRD), energy dispersive spectrometry (EDS), and scanning electron microscopy (SEM), and the Hall effect was also measured. These characterizations indicated that CMTSSe thin films may find applications in photovoltaic absorbing materials. In addition, different substrates were found to affect the morphology and compactness of the grains of the thin film.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Fan Sun,Zhongnan Guo,Huanhuan Zhang,Wenxia Yuan
Previous study suggested that Se-site doping with Te or S in tetragonal FeSe adjusts the superconductivity only by expanding or compressing the lattice parameters . However, three chalcogens X ( X = S, Se, Te) show different electronegativity, which could directly change the interaction between Fe & X , and their electronic structures. In order to understand this underlying mechanism, the samples with different anion compositions but the same lattice parameters are required. In this work, two superconductors : FeSe 0.95 Te 0.03 S 0.02 and FeSe 0.9 Te 0.057 S 0.043 have been synthesized by solid state reaction. The thus-obtained samples have the same lattice parameters in tetragonal single phase as that of undoped FeSe. It is found that despite the unchanged lattice, S/Te co-doping on Se-site still increased the density of the electronic states (DOS) near the Fermi level, thereby enhanced the superconductivity. Our results suggest that the influence of Se-site doping with the same valence chalcogen in superconducting FeSe is not simply in the view of the lattice size, effects on electronic structures originated from different electronegativity during Se-site doping should also be considered.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Ao Nan Lai,Yi Zhi Zhuo,Chen Xiao Lin,Qiu Gen Zhang,Ai Mei Zhu,Mei Ling Ye,Qing Lin Liu
A series of phenolphthalein-based poly(arylene ether sulfone nitrile)s containing imidazolium groups on the side chains was synthesized to prepare anion exchange membranes (AEMs) for alkaline fuel cells . Strong polar nitrile groups were introduced into the polymer backbone with the intention of improving the dimensional stability of the AEMs. The content of nitrile groups was varied to study the effect of nitrile groups on the morphology and properties of the AEMs. With imidazolium groups locating on the cardo side chains, all the AEMs exhibited well-defined microphase-separated structures. Furthermore, the imidazolium groups tend to aggregate with increasing the nitrile group content resulting in the formation of larger and more interconnected ionic domains in the AEMs. The ionic conductivity in the range of 2.21–8.14×10 −2 S cm −1 increased with increasing the nitrile group content and temperature. The AEMs showed superb ratios of conductivity to IEC or swelling ratio at 60 °C, good mechanical properties , and thermal and alkaline stability. A single H 2 /O 2 fuel cell using the as-prepared AEMs showed an open circuit voltage of 0.95 V and a peak power density of 50.6 mW cm −2 at 60 °C.
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高影响因子
Nano Research
·
2017
·Vol. 10
·期 7
·2495-2507
·
IF 7.354
Yu Huijuan,Li Hanwen,Yuan Shouyi,Yang Yuchi,Zheng Jiahui,Hu Jianhua,Yang Dong,Wang Yonggang,Dong Angang
Mesoporous carbons have been widely utilized as the sulfur host for lithium-sulfur (Li-S) batteries. The ability to engineer the porosity, wall thickness, and graphitization degree of the carbon host is essential for addressing issues that hamper commercialization of Li-S batteries, such as fast capacity decay and poor high-rate performance. In this work, highly ordered, ultrathin mesoporous graphitic-carbon frameworks (MGFs) having unique cage-like mesoporosity, derived from self-assembled Fe 3 O 4 nanoparticle superlattices, are demonstrated to be an excellent host for encapsulating sulfur. The resulting S@MGFs exhibit high specific capacity (1,446 mAh·g –1 at 0.15 C), good rate capability (430 mAh·g –1 at 6 C), and exceptional cycling stability (~0.049% capacity decay per cycle at 1 C) when used as Li-S cathodes. The superior electrochemical performance of the S@MGFs is attributed to the many unique and advantageous structural features of MGFs. In addition to the interconnected, ultrathin graphitic-carbon framework that ensures rapid electron and lithium-ion transport, the microporous openings between adjacent mesopores efficiently suppress the diffusion of polysulfides, leading to improved capacity retention even at high current densities.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Ling Yi,Yisi Wang,Guanliang Lin,Danling Lin,Wenliang Chen,Yugang Huang,Guodong Ye
Ring-opening polymerization of S -propargyl-cysteine -N -carboxyanhydride has been used to synthesize conformation switchable poly( S -propargyl-cysteine) starting with l -cysteine, d l - and d -cysteine. Then cationic polypeptides with different backbone chirality are obtained by nearly 100% side-chain grafting of cysteamine via thiol-yne click chemistry. The cationic polypeptides containing mixed conformations of β-sheets, β-turns and random coils are stable against pH, salt and temperature variations. The cationic polypeptides can condense siRNA at a low polypeptide/siRNA weight ratio to form nanoparticles with size depending on the backbone chirality. The cationic polypeptides derived from poly( S -propargyl- l or d -cysteine) are non-cytotoxic to HeLa and HepG2 cells, but interrupting the backbone chirality enhances the cytotoxicity sharply. The cationic polypeptides used for siRNA delivery show good transfection efficiency, but cell internalization process depends on the backbone chirality. The cationic polypeptide derived from the poly( S -propargyl- l -cysteine) is an appropriate siRNA vector with advantages of non-cytotoxicity and high transfection efficiency.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 10
·5863-5871
·
IF 3.108
Chen Zhan,Xiao-Bin Fu,Yefeng Yao,Hua-Ji Liu,Yu Chen
A series of hyperbranched poly(amidoamine)s (HPAs) were synthesized from the Michael addition copolymerization of tris(2-aminoethyl) amine (TAEA) and two bisacrylamide monomers N,N′-cystamine bisacrylamide (CBA) and N,N′-hexamethylene bisacrylamide (HMBA) at room temperature. The further modification with isobutyric anhydride led to isobutyramide terminated HPA (HPA-C4). 1H NMR and 15N NMR characterizations proved the successful preparation of these polymers. Moreover, beside the contents of TAEA, CBA and HMBA units in the composition, 15N NMR spectrometry could supply more structural information than 1H NMR spectrometry, such as the ratio of different amine groups in polymers, the transformation efficiency of reactive primary and secondary amines into C4 groups. GPC measurements not only gave the information of molecular weight and polydispersity, but also proved that all the HPA-C4s containing disulfide bonds could be degraded after being treated with dithiothreitol (DTT). Turbidimetry measurements showed that HPA-C4s had thermoresponsive property in water. The cloud point temperature (Tcp) of HPA-C4s was pH-dependent. Moreover, DTT could only affect the thermoresponsive property of HPA-C4s containing disulfide bonds due to the induced polymer degradation. Although no traditional fluorophores existed in HPA-C4s, HPA-C4s could emit blue fluorescence centered at ca. 455 nm. The fluorescence intensity was influenced pronouncedly by polymer concentration, pH, oxidizing time.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
Gui-lin Zhuang,Jia-qi Bai,Xin-yong Tao,Jian-min Luo,Xiang Zhou,Wen-xian Chen,Xing Zhong,Xiao-nian Li,Jian-guo Wang
S, N-co-doped porous carbon (SNPC) exhibit potential application in fuel cell, supercapacitors and lithium-ion batteries (LIBs) because of synergistic effect of S and N atom. However, SNPC prepared by one-pot method usually features the drawback of low S-content and thereby weakens the synergistic effect both geometrically and electronically. Herein, we reported one facile synthetic approach to prepare high S-content SNPC. In this regard, the introduction of NaH 2 PO 4 into the pyrolysis of S, N-containing precursor is beneficial to confine S atoms in carbon framework. It is found that S-content is 25.05% for SNPPC-700, 12.58% for SNPPC-800, higher than previously reported results. Structural characterizations indicate that NaH 2 PO 4 salt plays an important role. Furthermore, LIBs test shows high S-content SNPPC-800 features the higher capacities of 977.68 mAh g −1 after 50 cycles than those of low S-content SNPC-800 at 100 mA g −1 . Moreover, ORR activity measurements show a slight better performance and cycling durability than low S-content SNPC. In addition, the SNPPC-800 also reveals excellent supercapacitor performance with an specific capacitance of 227.5 F g −1 at 0.5 A g −1 , and kept 160.29 F g −1 via the measurement of 6000 cycles at 10 A g −1 .
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