RSC Advances
·
2017
·Vol. 7
·期 89
·56183-56193
·
IF 3.108
Yong Zhang,Bin Yang,Kuiling Li,Deyin Hou,Changwei Zhao,Jun Wang
A novel terpolymer (abbreviated as THV), which is a copolymer of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride, that possesses advantages of excellent hydrophobicity, mechanical properties, and chemical resistance is an ideal material for membrane distillation. In this study, THV hydrophobic membranes were fabricated by the electrospinning method. Morphology and properties (pore size distribution, liquid entry pressure, porosity, and contact angle) of the THV electrospun membranes with various fabrication conditions (solvent composition, THV concentration, and applied voltage) were systematically studied. Under the optimized condition, the membrane exhibited a good structure, wetting resistance, and surface hydrophobicity. The mean pore size, liquid entry pressure of water (LEPw), and contact angle were 0.79 μm, 118.0 kPa, and 130.7°, respectively. Owing to the advantages of the raw material and fabrication method, the membrane showed excellent mechanical properties and desalination performance. The tensile strength was 5.41 MPa, and the elongation at break was 247.9%, which were 2.47 and 5.61 times higher than those of the poly(vinylidene fluoride) (PVDF) membrane, respectively. Additionally, the membrane distillation flux was 4.42 kg m−2 h−1, which was 1.93 times higher than that of the PVDF counterpart obtained under the same test condition via sweeping gas membrane distillation, and the salt rejection rate was higher than 99.8%.
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International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 32
·期 1
·169-181
·
IF 5.6
Li Haixu,He Haobo,Jiang Tiannan,Du Yunfei,Wu Zhichen,Xu Liang,Wang Xinjie,Liu Xiaoguang,Yu Wanhua,Xue Wendong
S and Co co-doped carbon catalysts were prepared via pyrolysis of MOF-71 and thiourea mixtures at 800°C at a mass ratio of MOF-71 to thiourea of 1:0.1 to effectively activate peroxymonosulfate (PMS) for methylene blue (MB) degradation. The effects of two different mixing routes were identified on the MB degradation performance. Particularly, the catalyst obtained by the alcohol solvent evaporation (MOF-AEP) mixing route could degrade 95.60% MB (50 mg/L) within 4 min (degradation rate: K = 0.78 min −1 ), which was faster than that derived from the direct grinding method (MOF-DGP, 80.97%, K = 0.39 min −1 ). X-ray photoelectron spectroscopy revealed that the Co–S content of MOF-AEP (43.39at%) was less than that of MOF-DGP (54.73at%), and the proportion of C–S–C in MOF-AEP (13.56at%) was higher than that of MOF-DGP (10.67at%). Density functional theory calculations revealed that the adsorption energy of Co for PMS was −2.94 eV when sulfur was doped as C–S–C on the carbon skeleton, which was higher than that when sulfur was doped next to cobalt in the form of Co–S bond (−2.86 eV). Thus, the C–S–C sites might provide more contributions to activate PMS compared with Co–S. Furthermore, the degradation parameters, including pH and MOF-AEP dosage, were investigated. Finally, radical quenching experiments and electron paramagnetic resonance (EPR) measurements revealed that 1 O 2 might be the primary catalytic species, whereas ·O 2− might be the secondary one in degrading MB.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Liujie Lu,Zhenxiang Chen,Peihong Lin,Chuyan Rong,Rajkumar Devasenathipathy,Yujing Zhong,Limin Wang,Du-Hong Chen,Youjun Fan,Wei Chen
The M N C (M = non-noble metal) materials have been utilized as highly active and cost-efficient catalysts for boosting the ponderous kinetics of oxygen reduction reaction (ORR). However, the fabrication and tailoring of bi-active sites in M N C catalysts are essential for ORR. In this investigation, the N -doped porous carbon supported Co– and Zn- based nanoparticles (Co/Zn N C) catalyst was synthesized by carbonizing the composite of ZIF-8 and cobalt phthalocyanine. By tailoring the numbers of active sites in Co/Zn N C, the catalyst achieved a maximum half-wave potential ( E 1/2 ) of 0.846 V ( vs RHE ) and a highest limiting current density of 5.4 mA cm −2 in alkaline medium. After 20,000 cyclic voltammetry cycles, the E 1/2 shift of Co/Zn N C has been only shifted about 30 mV, outperforming commercial Pt/C catalysts (126 mV). Density Functional Theory calculations reveal that the cooperative interaction between adjacent Zn and Co active sites enhances the adsorption of ORR intermediates, thus boosting the overall reaction kinetics. This investigation offers a novel strategy for the construction of highly active and cost-effective metal catalysts as well as tailoring the numbers of active sites for ORR.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Jiuxiao Sun,Pei Leng,Yuhua Xie,Xinxin Yu,Konggang Qu,Ligang Feng,Haifeng Bao,Fang Luo,Zehui Yang
The commercialization of rechargeable zinc air batteries (ZABs) requires the discovery of high-performance, low-cost and durable bifunctional oxygen electrocatalysts . In this work, we report nitrogen doped carbon nano/microtubes confined metallic cobalt nanoparticles and single atoms (Co@NCNT/Co-SA@NCMT) as robust oxygen electrocatalyst for rechargeable ZABs. Co@NCNT/Co-SA@NCMT exhibits 18 times better ORR performance than Co@NCNT ascribed to the relay catalysis by Co-SAs and Co-NPs via O 2 →H 2 O 2 →H 2 O pathway. Experimental and theoretical investigations reveal that Co-SAs are capable of efficient oxygen reduction to H 2 O 2 , which is further reduced to H 2 O by Co-NPs due to its higher oxophilicity. Besides, due to the formed microtubes, the overpotential at 100 mA cm −2 in OER catalysis is lowered by 130 mV for Co@NCNT/Co-SA@NCMT than Co@NCNT. The power density of the assembled rechargeable ZAB is 155 mW cm −2 for Co@NCNT/Co-SA@NCMT outperforming the noble-metal counterpart (Pt/CB-IrO 2 : 71 mW cm −2 ). Furthermore, a superior stability with inappreciable increment in voltage gap for 300 h is achieved. Co@NCNT/Co-SA@NCMT also performs its high potential in the practical application with a maximum battery performance of 120 mW cm −2 sustained for 17 h in all-solid-state ZABs test.
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ACS Applied Energy Materials
·
2025
·
IF 5.5
Ruiqing Zhang,Guanyu Li,Shiyi Chen,Wenguo Xiang
The successful commercialization of concentrated solar power (CSP) plants necessitates the development of efficient energy storage systems to ensure the on-demand power generation during solar transients. In recent years, the redox cycling of doped CaMnO3−δ has emerged as a promising approach for thermochemical energy storage (TCES) in CSP applications. This study aims to enhance the thermochemical energy storage capability of CaMnO3−δ by co-doping with Sr and Co at the A- and B-sites, respectively, forming (SrxCa1–x)(CoxMn1–x)O3–δ. Two doping levels (x = 0.05 and 0.10) were investigated. XRD and SEM–EDS analyses confirmed that Sr and Co were homogeneously incorporated into the perovskite lattice, yielding porous microstructures in both compositions. Notably, evaluation of the thermochemical energy storage (TCES) densities of these codoped perovskites under diverse thermal energy storage conditions revealed that although the two materials exhibited different heat storage processes, comparable TCES densities were ultimately achieved. In particular, under favorable thermochemical energy storage conditions (1100 °C, pO2 = 10–5 atm), the thermochemical energy storage densities of Sr0.05Ca0.95Co0.05Mn0.95O3–δ and Sr0.10Ca0.90Co0.10Mn0.90O3–δ achieved 459 kJ/kgABO3 and 470 kJ/kgABO3, respectively. However, in the subsequent redox cycle tests, Sr0.10Ca0.90Co0.10Mn0.90O3–δ demonstrated a stronger reoxidation capability compared to Sr0.05Ca0.95Co0.05Mn0.95O3–δ. Compared to the undoped material, both co-doped samples exhibited significant improvements in the TCES density and thermal stability. Moreover, the isothermal redox reaction rate measurements and the analysis revealed the rapid redox reaction rate in both materials, providing valuable insights for the development of advanced perovskite-based thermochemical energy storage systems.
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Journal of Macromolecular Science Part B-Physics
·
2022
·
IF 1.366
Jiaming Gu,Zhihua Zhou,Tianlong Huang,Wei Wu,Wenjuan Liu,Yanmin Zhao,Ping Chen,Ziwei Zhou,Dan Wang,Chao Zhang,Meilin Yi,Xiao He,Jianjun Fang
Composite porous microspheres based on blends of poly(D,L-lactide-co-glycolide-co-ε-caprolactone) (PLGCL) and 1,4-butanediamine modified poly(D,L-lactide-co-glycolide) (BMPLGA) were prepared by using a combined solvent evaporation and particle leaching technique. The morphologies and porous structure of the PLGCL/BMPLGA microspheres were observed by using scanning electron microscopy (SEM). The in-vitro degradation behaviors and cytocompatibility were studied. The resultant microspheres showed a porous surface and a three-dimensional network structure with interconnecting pores. The changes of morphologies, pH value and mass loss during in-vitro degradation in phosphate buffered solution (PBS) at 37°C indicated that the degradation rate of the BMPLGA was faster than that of the PLGCL in the PLGCL/BMPLGA blends. We suggest the PLGCL/BMPLGA porous microspheres were non-cytotoxic and showed excellent cytocompatibility. We suggest the PLGCL/BMPLGA porous polymeric microspheres have great potential for application for drugs delivery and tissue regeneration.
研究领域:
生物材料
·
高分子科学
·
药物递送
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组织工程
·
生物医学工程
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ACS Catalysis
·
2024
·
IF 11.3
Baoxin Ge,Pengyang Jiang,Biyi Chen,Caijin Huang
The orbital hybridization between metal and oxygen of perovskite catalysts can lower the overpotential and enhance the oxygen evolution reaction (OER) activity. This study combines density functional theory with experiments to clarify how Sr/Fe codoping modulates orbital hybridization and enhances OER catalytic activity of LaCoO3. The as-prepared La0.50Sr0.50Co0.75Fe0.25O3 shows remarkable performance with a low overpotential of 310 mV at 10 mA cm–2 current density and a 107.03 mV dec–1 Tafel slope, outperforming most state-of-the-art perovskite-based OER electrocatalysts. The experimental results confirm that Sr/Fe codoping enhances the expansion of Co–O–Co bond angles and strengthens the covalency of the Co–O bond in LaCoO3, leading to enhanced electrocatalytic activity. Moreover, increasing Sr doping reduces the distance between the Co 3d/O 2p center and the Fermi level, decreasing the energy difference between them and enhancing the degree of orbital hybridization between Co 3d and O 2p. As the degree of Co 3d/O 2p orbital hybridization increases, a higher charge transfer was found between the active center and intermediate product, OOH, reducing the energy barrier of the rate-determining step while lowering the overpotential. This study provides thorough insight into the rational design of OER catalysts based on orbital hybridization.
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SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Zhaoyang Zheng,Dong Han,Tianyu Zhang,An Du,Ruina Ma,Yongzhe Fan,Xue Zhao,Xiaoming Cao
The Co-depletion zone in WC–Co brazed joints is the main zone of joint failure, so it is crucial to explore novel processes to inhibit the Co-depletion zone and enhance the joint shear strength. In this study, a composite process of pre-plating Cu on the WC–Co surface + brazing was designed. Co-depletion zone reduces from 6 μm to 1 μm due to the Cu plating. Meanwhile, the formation of a plating fusion zone in the filler layer transforms TiCo with a thickness of 2.5 μm into a small number of TiCo particles. Moreover, the high concentration of Cu atoms in the vicinity of the WC particles at the interface changes the Co-segregation layer in the WC into a Cu-rich layer. The concentration of Cu in the filler layer leading to precipitation of TiCu and Ti 2 Cu particles. Ti 2 Cu particles encapsulated by ductile Ag–Cu–In ternary eutectic contribute to inhibit the cracks propagation. The shear strength of the joints was enhanced by 51.3 % to 295 MPa. The composite process of pre-plating on the base material surface + brazing has positive significance in inhibiting the excessive diffusion of elements from the base materials to the filler layer.
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APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Meidan Que,Yabo Wang,Ruochen Shi,Xun Sun,Jun Xu,Peihong Ma,Yanbo Sun,Jing Guan,Shengxia An
MIL-125(Ti) is well known for having stable structure, tunable electron structure, and multiple active sites, which is commonly studied in the field of photocatalysis . In this work, a series of rare earth (RE) doped MIL-125(Ti) (RE=Ce, Pr, Tm, Dy, Eu, and Sm) are prepared via the one-step hydrothermal method . Notably, Pr-MIL-125 displays a significantly enhanced catalytic performance than other RE-doped MIL-125, resulting in a maximal CO and CH 4 yield of 13.30 and 0.87 µmol·g −1 ·h −1 , respectively, which are 2.53-fold and 4.14-fold of the pristine MIL-125. The layered morphology endows Pr-MIL-125 with more active sites and facilitates the reaction of photoreduction CO 2 . Furthermore, the promoted photoactivities attributed to Pr ion dopant can act as electron transfer bridge and suppress charge recombination. This work would provide insight and guidance for designing RE-MOF based photocatalysts and enhancing the performance of photoreduction CO 2 .
研究领域:
材料化学
·
光催化
·
环境科学
·
无机化学
·
能源化学
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Kang An,Siran Zhang,Hong Wang,Ningyan Li,Ziyang Zhang,Yuan Liu
Direct hydrogenation of CO 2 into ethanol has been considered as an up-and-coming way to achieve CO 2 utilization. Ethanol can be generated by reverse water gas shift as well as CO hydrogenation over Co-based catalysts, where the regulation of Co 0 − Co δ+ is critical. Herein, we designed a supported Co-based catalyst doped with gallium, which was derived from Co-Al-O spinel precursor to facilitate synergistic catalyzing for CO 2 -to-ethanol transformation. The selectivity of ethanol reached 20.1 % in a continuous flow fixed micro-reactor over reduced CoGa 1.0 Al 1.0 O 4 /SiO 2 catalyst at 270 °C and 3.0 MPa. Results of characterization show that the existence of the strong interaction between Ga oxide and cobalt induced the configuration of Co 0 − Co δ+ active pairs, which promotes the process of ethanol synthesis by coupling the dissociation (CH x *)/non-dissociation (CO*) of the intermediates. The strategy by tuning the interaction between cobalt and gallium and/or aluminum oxide brings an avenue to tailor Co 0 − Co δ+ active pairs for the hydrogenation of CO and CO 2 .
研究领域:
催化化学
·
能源化学
·
材料化学
·
环境化学
·
工业催化
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yafei Xue,Ge Ma,Xin Wang,Mingliang Jin,Eser Metin Akinoglu,Dan Luo,Lingling Shui
The development of high-efficiency oxygen electrocatalysts with earth-abundant transition metals rather than scarce noble metals has aroused growing interests due to their potential for energy storage and conversion applications. Herein, we developed a facile strategy to synthesize hollow tubular bimetallic Ni–Co oxide rooted with dense nanosheets for enhanced bifunctionality and facilitated redox reaction kinetics. Owing to the rational design of morphology and well-dispersed Ni and Co ions, the bimetallic samples exhibit admirable bifunctional electrocatalytic activities. This bimetallic Ni–Co oxide shows superior oxygen electrocatalytic performance in comparison with the monometallic Ni and Co oxides, according to the electrocatalytic synergistic effect from the bimetallic system. The optimized sample with the specific mass ratio of Ni and Co displays the oxygen reduction reaction (ORR) property comparable to commercial Pt/C and oxygen evolution reaction (OER) performance superior to commercial RuO2. The electrochemical tests and structural characterizations offer in-depth dissection on the electrocatalytic behaviors, especially the superb stability in both ORR and OER tests, as well as the outstanding resistance to methanol poisoning, representing a promising candidate in the renewable energy field.
研究领域:
材料科学
·
能源化学
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Jianhua Lü,Yuqin Fu,Dongmei Wang,Changli Lü
Luminescent silver nanoclusters (NCs) decorated with temperature-responsive copolymer P(NIPAm-co-MQ) have been fabricated in aqueous solution as a new fluorescent pH stimuli-responsive functional materials. P(NIPAm-co-MQ) was prepared by a conventional free-radical copolymerization of isopropylacrylamide (NIPAm) as thermo-responsive units and 5-(2-methacryloylethyloxymethyl)-8-quinolinol (MQ) as coordinating groups. The obtained fluorescent Ag NCs with various sizes showed different morphologies from single sphere to chain structure induced by the copolymer ligand. Upon changing the temperature, the fluorescence intensity of the Ag NCs exhibited temperature triggered response simultaneously. The copolymer stabilized Ag NCs as a pH probe exhibited reversible pH-dependent PL properties over the pH range of 3.04–5.25. With the pH decreased, the fluorescence intensity of Ag NCs under a UV lamp decreased and it was almost completely quenched after pH 3.04. Also, the properties of this fluorescence change with pH are reversible.
研究领域:
材料科学
·
纳米技术
·
分析化学
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危险品化学品经营许可证（带存储）