JOURNAL OF POWER SOURCES
·
2023
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IF 9.2
Mingfa Shao,Dingwei Ji,Zefeng Xu,Juncheng Dong,Xiaojing Lv,Mi Ouyang,Yaokang Lv,Dominic S. Wright,Cheng Zhang
Three star-structured monomer molecules of 9-phenylcarbazole derivatives (TTCB) (TBTCB) (TECB) are synthesized and their conjugated polymer films (pTTCB) (pTBTCB) (pTECB) are prepared by electrochemical polymerization , respectively. The electrochromic (EC) properties and energy storage properties are compared of them, and the results indicate that the pTBTCB shows faster colored speed and higher cycling stability than pTTCB, as well as higher optical contrast than pTECB. Besides, the pTBTCB exhibits a high specific capacitance of 2.96 mF·cm −2 and high energy density of 0.26 mWh·cm −2 , which is viewed as excellent electrochromic supercapacitor materials. We further prepare a novel hybrid thin film pTi-TBTCB with rough porous surface by electrochemical co-polymerization with TBTCB and polyoxotitanate (POT). Moreover, compared with pTBTCB, pTi-TBTCB film has higher optical contrast (45.72%), faster switching time (1.91 s, 1.26 s) and higher energy storage capacitance (4.35 mF·cm -2 ). Therefore, using pTi-TBTCB as electrode material , we finally prepare a prototype electrochromic supercapacitors (ECSCs), which appears blue when fully charged (1.6 V) and yellow when drained (0 V). This work further proves that polyoxotitanate can be introduced into EC films to prepare hybrid electrode materials, which can improve electrochromic and energy storage properties as electrode materials for ECSCs.
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RSC Advances
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2021
·Vol. 11
·期 62
·39291-39305
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IF 3.361
Rui Li,Haoran Xu,Yuhang Zhang,Lijing Chang,Yang Ma,Yanjun Hou,Shoulei Miao,Cheng Wang
Pyrene is composed of four benzene rings and has a unique planar melting ring structure. Pyrene is the smallest condensed polycyclic aromatic hydrocarbon, and its unique structural properties have been extensively studied. Pyrene has excellent properties such as thermal stability, high fluorescence quantum efficiency and high carrier mobility. This paper mainly used thiophene, EDOT and triphenylamine groups to enhance the pyrene based π-conjugated system and control the molecular accumulation of organic semiconductors, and improve their charge transport performances. Five kinds of polymer were synthesized and correspondingly characterized. The five kinds of pyrene conductive polymer had outstanding properties in terms of solubility, fluorescence intensity and thermal stability, good film-forming properties, stable electrochromic properties and high coloring efficiency. The coloration efficiency (CE) of PPYTP was as high as 277 cm2 C−1, and the switching response time was short. The coloring time of PPYEDOT was 1.3 s and the bleaching time was 3.2 s. The lower impedance will also provide the possibility of such polymers being incorporated into electrochromic devices in the future. In short, the synthesized new pyrene conductive polymers will have wide application prospects in the field of electrochromic materials.
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PubMed
高影响因子
FUEL
·
2021
·
IF 6.609
Lan li,Feng Ju,Yao Sun,Hui Pan,Hao Ling
The Ni/ZnO-Al 2 O 3 -SiO 2 adsorbent is a widely used industrial adsorbent for reactive adsorption desulfurization (RADS) process. Metallic Ni and NiO are assumed as the main RADS active sites, and NiS x is the intermediate phase to transfer sulfur to ZnO. However, NiS x could also be the active center for RADS process. In this work, to conduct the desulfurization activity of NiS x , a novel NiSO 4 /ZnO-Al 2 O 3 -SiO 2 adsorbent was prepared and examined through a serious experimental and theoretical study over the conventional adsorbents. Results showed that NiSO 4 based adsorbents could first self-sulfide to NiS x phases, and then NiS x plays as main active sites for RADS. The NiSO 4 phases improved the direct desulfurization selectivity of dibenzothiophene (DBT). By adjusting the content of nickel, the sulfur removal rate of adsorbent with 3 wt% Ni from NiSO 4 could achieve the same level of adsorbent prepared with 18 wt% Ni from NiO. Moreover, NiSO 4 based adsorbent performs excellent desulfurization activity, and its breakthrough sulfur capacity achieves 122.0 mgS/g. The evolution of Ni species on NiSO 4 adsorbent has been studied, and a desulfurization mechanism that takes both NiO and NiS x as active phases has been carried out. NiO phase mainly promotes the hydrodesulfurization pathway, while NiS x phase prefers the direct desulfurization pathway. Finally, the mechanism of RADS on NiS x and the reaction pathways of DBT are also presented.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Ya Yuan Zhang,Qiao Jing Lin,Ding Ling Gao,Yu Xiang Liu,Na Qin,Yan Xue Xue,Fei Fei Dai,Jian Hua Chen,Qian Yang
NHC/Co-MOF-Cu 2+ composite adsorbent materials were prepared through the in-situ synthesis of nitrogenous heterocyclic compounds (NHC) on Co-containing metal–organic framework (Co-MOF) using terephthalaldehyde (C 8 H 6 O 2 ) and p-Phenylenediamine (C 6 H 8 N 2 ) at room temperature. Subsequently, further modification with Cu 2+ was carried out. These materials were then utilized for the removal of dibenzothiophene (DBT) from simulated gasoline. The samples were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR) and other methods. The results indicated the uniform attachment of NHC and Cu 2+ metal particles onto Co-MOF, confirming the successful synthesis of NHC/Co-MOF-Cu 2+ adsorption materials. The introduction of Cu 2+ enhanced the π-complexation between NHC/Co-MOF-Cu 2+ and DBT. The introduction of NHC brought heteroatoms and ring structures to the composite, increasing the electron cloud density of the NHC/Co-MOF-Cu 2+ composite and thereby amplifying the π-complexation with DBT. The adsorption capacity of NHC/Co-MOF-Cu 2+ for DBT (150.4 mg/g) is significantly larger than that of Co-MOF (102.5 mg/g). The adsorption process of NHC/Co-MOF-Cu 2+ for DBT followed the pseudo-second-order kinetic model and Langmuir model. Additionally, the adsorption process was found to be spontaneous and exothermic. Over five consecutive adsorption–desorption cycles, the efficiency of NHC/Co-MOF-Cu 2+ decreased by only 10 %, indicating its excellent regeneration performance.
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高影响因子
FUEL
·
2023
·
IF 7.4
Xingye Zeng,Cunhui Lin,Qinggang Ren,Shufeng Shan,Hanlu Wang
Developing a highly efficient catalyst is one of the important topics in the field of oxidative desulfurization from liquid fuels. In this study, the composite metal oxide catalysts (CuO-MgO) with co-catalyst MgMoO 4 were prepared by co-precipitation method with simple process, high efficiency and good performance and their structures characterized. An efficient extractive catalytic oxidative desulfurization (ECODS) system for liquid fuel was successfully developed on the basis of as-prepared CuO-MgO-MgMoO 4 (CuMgMo) as the catalyst, sodium hypochlorite (NaClO) as the oxidant, and acetonitrile as the extractant. Taking the n -decane and n -tetradecane containing dibenzothiophene (DBT) as the test model oil sample, the main parameters influencing desulfurization performance were examined in detail, such as the molybdenum content, the dosage of CuMgMo, the reaction temperature, the initial S-concentration, the different extractants, the volume ratio of extractant to oil, the different oxidants, and the molar ratio of NaClO to DBT . Based on optimized desulfurization reaction conditions, the model oil containing different sulfur compounds (benzothiophene, 4-methyldibenzothiophene, and 4,6-dimethyldibenzothiophene) and the real oil (straight-run gasoline, straight-run kerosene, and straight-run diesel) were further tested. Based on the free radical trapping experiments and the calculation of density functional theory, the reaction mechanism was deeply explored. The results showed that the de-electron reaction of DBT was mainly catalyzed by MgMoO 4 and the reaction of HClO obtaining electron was mainly catalyzed by CuO. MgMoO 4 plays an assisting role in improving the catalytic reaction rate. This work will provide a useful reference for the construction of efficient ECODS system using composite metal oxides.
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高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2023
·
IF 3.6
Yanqing Yang,Haidong Jiang,Zhiyuan Zhou,Juekuan Yang,Yujuan Wang,Kedong Bi
The Young’s modulus of polythiophene (PT) nanofibers has not been reported so far. In this paper, PT nanofibers were electrolytically prepared from thiophene monomer with a porous anodic aluminum oxide template. The Young's modulus of individual PT nanofibers was measured using atomic force microscopy. The average Young's modulus of PT nanofibers with diameters around 90 nm was 64.5 ± 5.0 GPa, which is an order of magnitude higher than its bulk value. We attribute the high Young’s modulus of PT nanofibers to the alignment of the molecular chain.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Jiani Zhang,Risheng Bai,Zhaochi Feng,Jiyang Li
Aiming to promote the activity of TS-1 zeolite in catalytic oxidative desulfurization (ODS), a general amide-assisted strategy was proposed to synthesize hierarchical TS-1 zeolite with rich and homogeneously distributed Ti(OH 2 ) 2 (OH) 2 (OSi) 2 species. Strong interactions between acrylamide (AM) and Si/Ti as well as self-polymerization of AM in synthetic gels change the zeolite formation process, thus to effectively construct Ti(OH 2 ) 2 (OH) 2 (OSi) 2 , promote Ti evenly distribution and form micro-mesopore structure. The activity of Ti(OH 2 ) 2 (OH) 2 (OSi) 2 was evaluated by ODS of refractory sulfur-containing compounds. The advantages of Ti(OH 2 ) 2 (OH) 2 (OSi) 2 over TiO 4 in substrate adsorption and reactive intermediate formation for ODS were further proved by theoretical calculations. By adjusting AM amount to optimize the Ti(OH 2 ) 2 (OH) 2 (OSi) 2 content and distribution, the obtained catalyst achieves 134.8 h -1 of turnover frequency and 100 % DBT removal at ten minutes, and maintains > 92 % removal after seven cycles at 333 K. This facile active-site construction strategy is promising to be extended to other heteroatom-containing zeolite catalysts.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Jiaxing Chen,Shufang Wu,Xinlin Zhang,Yongjun Liu
Unsupported MoS2 nanosheets are promising hydrodesulfurization (HDS) catalysts that can effectively convert sulfur species in diesel to hydrocarbons and H2S during the production process of fossil fuels. However, the active site density of MoS2-based catalysts is limited due to the existence of a large amount of inert basal planes, hindering the improvement of MoS2 HDS activity. Herein, a strategy that combines defect control and metal doping is proposed to boost the catalytic activity of unsupported MoS2 nanosheets. By adjusting hydrothermal reaction conditions, few-layered defect-rich MoS2 (DR-MoS2(FL)) is synthesized to significantly enhance the HDS efficiency, which is further improved by incorporating Ni atoms in basal planes, achieving the highest thiophene conversion of 92.3% at 280 °C. Moreover, the Ni-doped DR-MoS2(FL) catalyst exhibits excellent stability with the high activity retained in the recycling reaction. The effect of Ni dopants on the electronic structure and adsorption behavior of the MoS2 basal planes is demonstrated by density functional theory calculation. This work reveals a facile method to tailor the basal planes with the formation of more Ni–Mo–S active sites for highly efficient MoS2 HDS catalysts.
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WASTE MANAGEMENT
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2023
·
IF 8.1
Mengxin Lu,Yongjie Xue,Hui Zhao,Xiaoshan Zhang,Teng Wang
Secondary sulfur pollution in dyeing sludge (DS) during drying and incineration is a major environmental problem necessitating in-situ control. To robustly immobilise sulfur during drying–incineration, the authors introduce an electromagnetic induction (EMI) drying method and reveal the corresponding migration and conversion of sulfur in DS. The EMI-drying efficiency reached 10.69%/min, five times that of thermal drying. EMI drying increases the relative sulfoxide ratio from that of thermal drying. In a sludge–sulfur model, the proposed treatment promoted the oxidation and decomposition of organic sulfur without noticeably affecting the inorganic sulfur. The selective oxidation process during EMI drying promotes sulfur stabilisation in dried DS, decreasing the performance and stability of DS combustion. The sulfur-containing pollutants released during the incineration of DS mainly contain H 2 S, followed by CH 3 SH and SO 2 . EMI drying increases the outputs of SO 2 and CH 3 SH but decreases the outputs H 2 S and total sulfur compared with the outputs of thermal drying. Under the sulfur-model conditions, EMI promoted the conversion of inorganic sulfur to sulfur-containing gases (especially H 2 S) during incineration. In contrast, the sulfur stabilised by partial oxidation of organic sulfur in the EMI-dried DS was not easily converted to gaseous sulfur during subsequent combustion. Overall, EMI inhibits the release of sulfur during the combined drying–incineration process of DS.
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PubMed
高影响因子
Nano Research
·
2023
·
IF 9.9
Wu Kunjie,Wang Bin,Niu Yutao,Wang Wenjing,Wu Cao,Zhou Tao,Chen Li,Zhan Xianghe,Wan Ziyao,Wang Shan,Yang Zhengpeng,Zhang Yichi,Zhang Liwen,Zhang Yongyi,Yong Zhenzhong,Jian Muqiang,Li Qingwen
Floating catalysis chemical vapor deposition (FCCVD) direct spinning process is an attractive method for fabrication of carbon nanotube fibers (CNTFs). However, the intrinsic structural defects, such as entanglement of the constituent carbon nanotubes (CNTs) and inter-tube gaps within the FCCVD CNTFs, hinder the enhancement of mechanical/electrical properties and the realization of practical applications of CNTFs. Therefore, achieving a comprehensive reassembly of CNTFs with both high alignment and dense packing is particularly crucial. Herein, an efficient reinforcing strategy for FCCVD CNTFs was developed, involving chlorosulfonic acid-assisted wet stretching for CNT realigning and mechanical rolling for densification. To reveal the intrinsic relationship between the microstructure and the mechanical/electrical properties of CNTFs, the microstructure evolution of the CNTFs was characterized by cross-sectional scanning electron microscopy (SEM), wide angle X-ray scattering (WAXS), polarized Raman spectroscopy and Brunauer–Emmett–Teller (BET) analysis. The results demonstrate that this strategy can improve the CNT alignment and eliminate the inter-tube voids in the CNTFs, which will lead to the decrease of mean distance between CNTs and increase of inter-tube contact area, resulting in the enhanced inter-tube van der Waals interactions. These microstructural evolutions are beneficial to the load transfer and electron transport between CNTs, and are the main cause of the significant enhancement of mechanical and electrical properties of the CNTFs. Specifically, the tensile strength, elastic modulus and electrical conductivity of the high-performance CNTFs are 7.67 GPa, 230 GPa and 4.36 × 10 6 S/m, respectively. It paves the way for further applications of CNTFs in high-end functional composites.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xuzhao Gao,Yueyang Xu,Yan Yin,Ning Gu,Yongping Zeng
The adsorption desulfurization technology presents remarkable advantages and is a promising method because of its affordability, gentle operating conditions. Metal-organic frameworks (MOFs) have garnered significant attention owing to their remarkable features, including large specific surface areas, pore volume and the designable structure. The hierarchical porous CuBTC-DMA was successfully synthesized by adding salicylic acid and using the hydrothermal method. Subsequently, Ni ions were introduced into the structure using ion-exchange method. It was found that the doping of salicylic acid and Ni ions did not significant alter the structure of the material. The new type of π-complexed adsorbent, Ni@HP-CuBTC-DMA, was prepared. The results of adsorption desulfurization experiments showed that Ni@HP-CuBTC-DMA-1.5(0.2 M) had the highest adsorption capacity, with the maximum adsorption amounts of 25.63 mg S/g and 41.06 mg S/g for thiophene and benzothiophene , respectively. In the toluene competition experiment, the adsorption amount of thiophene could still reach 19.25 mg S/g. The results of regeneration experiments demonstrate that Ni@HP-CuBTC-DMA-1.5(0.2 M) still has excellent adsorption capacity after four cycles.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Ning Gu,Yueyang Xu,Yan Yin,Xuzhao Gao,Yongping Zeng
SO x released from the combustion of sulfur-containing compounds in fuels pollute the environment and have a serious impact on human health. Adsorption desulfurization is an effective and environmentally friendly technique for removing sulfur-containing compounds from fuels. Metal-organic frameworks (MOFs) have high specific surface areas and can be easily modified and functionalized, making them excellent candidates for adsorption desulfurization in fuels. In this work, the precursor MIL-100(Fe)-SA was prepared using the hydrothermal method , and the adsorbent Ni@MIL-100(Fe)-SA was obtained by doping Ni 2+ into the resulting MIL-100(Fe)-SA using the impregnation method. FT-IR, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and nitrogen adsorption-desorption isotherms were used to analyze the samples. The results indicated that Ni 2+ was successfully loaded onto MIL-100(Fe)-SA, and the MOF's structure remained stable. The adsorption performance of benzothiophene and thiophene was evaluated through batch adsorption experiments. The adsorption capacities of Ni@MIL-100(Fe)-SA for thiophene and benzothiophene were 23.68 mg S/g and 49.58 mg S/g, respectively. These observations could be ascribed to the π-complexation interactions between Ni 2+ of the framework and thiophenic compounds. The regeneration experiments demonstrated that the spent 11Ni@MIL-100(Fe)-SA-1.5 reach 86% of the adsorption capacity of fresh adsorbent after four cycles. Additionally, the regenerated adsorbent maintained good crystallinity after recycling.
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