FLUID PHASE EQUILIBRIA
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2015
·
IF 2.2
Tianxiang Zhao,Feng Sha,Jianbai Xiao,Qiang Xu,Xiaohong Xie,Jianbin Zhang,Xionghui Wei
Isothermal gas–liquid equilibrium (GLE) data were measured at 298.15 K and 122.66 kPa for dilute SO 2 in the binary system ethylene glycol (EG) + dimethyl sulfoxide (DMSO), in which SO 2 partial pressures were calculated in range of (0–130) Pa. The solubility of dilute SO 2 in the binary system gradually increased with the increasing DMSO concentration in the whole composition . Based on the GLE data, Henry’s law constants ( HLC ) of dilute SO 2 in the binary system EG (1) + DMSO (2) were obtained. The regeneration experiments showed that the 97.6% SO 2 could be separated from the dissolving SO 2 solution at 80 °C and bubbling N 2 within 30 min; meanwhile, SO 2 desorption ran smoothly and solubility of SO 2 no significant dropped after five-successive absorption–desorption cycles. Furthermore, to obtain important reaction mechanism, the intermolecular interaction among SO 2 , EG, and DMSO were investigated by UV–vis, FTIR, and 1 H NMR spectroscopic techniques. Spectral results showed that the interaction among EG, DMSO, and SO 2 were resulted from both the O → S charge-transfer interaction and intermolecular hydrogen bonding .
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 27
·期 2
·1457-1462
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IF 1.569
Sun Yunfei,Yang Lili,Wei Maobin,Chen Gang,Che Guangbo,Yang Jinghai,Wang Zhe,Gao Zhiyuan
Well aligned CoS NRAs with different length have been grown on ITO substrates by a simple chemical method without any catalyst. The morphology properties of the as grown CoS nanostructures were investigated by SEM and TEM images. From the SEM results measured from the tilt-view, with the reaction time increasing, the length of CoS nanorods increased. However these CoS(6) NRAs partially aggregated, which will decrease the surface area of CoS NRAs. The optimized photovoltaic performance with a Voc of 0.66 V, a Jsc of 1.96 mA/cm 2 , an FF of 0.43, and a η of 0.64 % is obtained from the device based on CoS(4) ANRAs electrode. Although the quantum dot sensitized solar cells (QDSSCs) with CoS NRAs show smaller η values than that of the QDSSC with sputtered Pt counter electrode, the CoS material will be an efficient alternative for the Pt electrode due to its excellent catalytic ability and low cost.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yiling Ran,Man Yang,Jian Li,Jinlei Song,Yi Wang,Zhanguo Li,Liyong Yuan
Developing versatile sorption materials for radionuclide capture (e.g. iodine) is critical for nuclear energy and environmental science. Covalent organic frameworks (COFs) have recently become a new platform for developing sorption materials because of their high surface area and functionalised skeleton structure. Herein, two types of COF materials containing thiophene were designed as iodine sorbents and synthesised via a Schiff base reaction of benzo[1,2-b:3,4-b’:5,6-b’’]trithiophene-2,5,8-tricarbaldehyde, benzidine (DADP) and p-phenylenediamine (DAB): DADP-COF and DAB-COF. DAB-COF exhibits a unique granular-rod-like morphology and has a higher surface area (1775 m 2 /g) than DADP-COF (1140 m 2 /g), which is clearly beneficial for the physical adsorption of iodine. Meanwhile, the COF backbone is rich in N and S sites, which are advantageous for the chemical adsorption of iodine. These two features make the two prepared COFs ideal iodine sorption materials. DAB-COF demonstrates an excellent gaseous iodine adsorption capacity of 4.2 g/g, ranking it as one of the most effective iodine sorption materials, while DADP-COF exhibits a good adsorption capacity of over 235 mg/g for iodine in cyclohexane solutions. Density functional theory calculations prove that imine N and thiophene S serve as active sites during the iodine adsorption. DAB-COF exposes more active sites because of its higher surface area, leading to a higher iodine adsorption capacity than DADP-COF. The results of this study indicate that introducing thiophene to COFs improves sorption efficacy for sorption applications in general and particularly paves the way for developing stable and effective COF sorbents for iodine capture from various environments.
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POLYMER
·
2017
·
IF 3.684
Zhongying Wu,Yiyao Tang,Dewen Sun,Shujiang Zhang,Yixuan Xu,Hua Wei,Chenliang Gong
Organic-inorganic hybrid polymers based on poly(arylene ether sulfone) (PAES) containing multi-sulfonated polyhedral oligosilsesquioxane (POSS) pendants (PAES-sPOSS-x) were synthesized to improve the inorganic fillers' distribution in polymer matrix and to enhance the ion conductivity and swelling resistance of aromatic polymer electrolyte membrane. The synthesis of the graft hybrid polymers in this study involves the grafting of mono-functional 3-Iodopropylheptaphenyl POSS with an -OH functionalized polymer main-chain and postsulfonation of the POSS grafted PAES. Notably, nearly all of the benzene rings on the POSS side chains were sulfonated successfully without any sulfonation of main chains. The structure with hydrophobic aromatic backbone and hydrophilic hybrid side chains made an improvement of the nano-phase hydrophilic/hydrophobic separation, thereby facilitating the formation of continuous proton exchange channels. The transmission electron microscopy (TEM) images of the comb-shaped polymer membranes showed homogeneous sulfonated POSS (sPOSS) dispersion, significant phase separation and well-defined interconnected hydrophilic networks. This morphological structure leaded to dramatically enhanced comprehensive properties as proton conductive membranes.
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CRYSTAL GROWTH & DESIGN
·
2016
·
IF 4.425
Ting He,Huiqiong Wu,Xiaojuan Wang,Qiguang Zang,Peng Xue,Rujuan Shen,Li Dang,Yi Zhang,Juan Xiang
A facile strategy was developed to fabricate structure controllable microcrystals of ferrocene-based metal–organic (Fc-Ala-BCB) materials through evaporation-induced self-assembly. Two distinctive microcrystals, microrods and microtubes had been achieved by tuning the solvents during the self-assemblies. X-ray diffraction analysis was conducted on single crystals to investigate the packing mode of Fc-Ala-BCB molecules, which indicated the two crystals with the hexagonal system. Inheriting the aromaticity and chirality of ferrocenyl and l-Ala, this organic molecule self-assembled into a single-helix structure through intermolecule hydrogen bonds and π–π stacking. Theoretical analysis and stimulated computations were carried out to compare the surface energies of certain planes. Among those microcrystals, the microrods exhibited a higher chemical activity in catalyzing the decomposition of H2O2, due to the high-density atomic steps and kinks on the high energy surfaces. However, the hollow hexagonal tubes displayed appropriate catalytic activity and novel maneuverability toward catalyzing H2O2. The O2 bubbles accumulated at the inner walls of the microtube were periodically released as individual bubbles, suggesting their potential application as a new kind of microengine (e.g., the microrotor).
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Yang Yang,Jiaqi Li,Dingqiong Chen,Jinbao Zhao
Fe3O4 is regarded as an attractive anode material for lithium ion batteries (LIBs) due to its high theoretical capacity, natural abundance, and low cost. However, the poor cyclic performance resulting from the low conductivity and huge volume change during cycling impedes its application. Here we have developed a facile electrophoretic deposition route to fabricate the Fe3O4/CNTs (carbon nanotubes)/rGO (reduced graphene oxide) composite electrode, simultaneously achieving material synthesis and electrode assembling. Even without binders, the adhesion and mechanical firmness of the electrode are strong enough to be used for LIB anode. In this specific structure, Fe3O4 nanoparticles (NPs) interconnected by CNTs are sandwiched by rGO layers to form a robust network with good conductivity. The resulting Fe3O4/CNTs/rGO composite electrode exhibits much improved electrochemical performance (high reversible capacity of 540 mAh g–1 at a very high current density of 10 A g–1, and a remarkable capacity of 1080 mAh g–1 can be maintained after 450 cycles at 1 A g–1) compared with that of commercial Fe3O4 NPs electrode.
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PubMed
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CARBON
·
2017
·
IF 6.337
Hong Yuan,Jia Liu,Qingze Jiao,Yongjian Li,Xiufeng Liu,Daxin Shi,Qin Wu,Yun Zhao,Hansheng Li
A novel sandwich-like hierarchical structure composed of reduced graphene oxide (RGO) and uniform cobalt disulfide (CoS 2 ) octahedrons is successfully prepared by a simple one-step solvothermal process, in which Co 2+ cations attracted into graphene framework by the electrostatic adsorption induce the growth of octahedral CoS 2 nanoparticles between the layers of graphene. The fascinating sandwich-like structured CoS 2 /RGO hybrid inherits excellent electrical conductivity of graphene skeletons. Meanwhile, CoS 2 octahedrons intercalated between the layers of graphene provide both rich inner active sites for the reduction of triiodide and abundant mesoporous structure for effective electrolyte diffusion. Benefit from the synergistic effects of CoS 2 octahedrons and RGO, the dye-sensitized solar cell (DSSC) assembled with this CoS 2 /RGO counter electrode (CE) manifests excellent photoelectric conversion efficiency (7.69%), even higher than that of DSSC with conventional noble metal Pt CE (7.38%). Furthermore, CoS 2 /RGO composite displays outstanding electrochemical stability in I 3 − /I − redox electrolyte . Overall, this design provides a new strategy for the development of alternative Pt-free counter electrode materials in a DSSC system.
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CARBON
·
2017
·
IF 6.337
Yan-Jun Wan,Peng-Li Zhu,Shu-Hui Yu,Rong Sun,Ching-Ping Wong,Wei-Hsin Liao
Large-sized graphene sheets (LG) and doping strategy were employed to fabricate lightweight and flexible graphene paper with exceptional electromagnetic interference (EMI) shielding performance. Compared with the smaller sized ones, LG with fewer defects and more conjugated carbon domain size as well as better alignment result in higher electrical conductivity and strength of graphene paper. The iodine doping further improves the carrier density of LG by formation of triiodide ( I 3 − ) and pentaiodide ( I 5 − ) through charge transfer process without deteriorating the mechanical property, thus leading to superior EMI shielding effectiveness (SE). The EMI SE of iodine doped LG film with thickness of 12.5 μm is up to ∼52.2 dB at 8.2 GHz, which is much higher than that of undoped LG with the same thickness (∼47.0 dB). More important, the improvements in EMI SE is contributed to the SE absorption, while the SE reflection is almost unchanged. The mechanisms of improved EMI shielding performance as well as mechanical property were investigated and discussed. The present study provides a facile way to fully develop graphene in lightweight and flexible EMI shielding materials and devices.
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RSC Advances
·
2017
·Vol. 7
·期 17
·10494-10502
·
IF 3.108
Yanming Zhao,Futai Lu,Jie Zhang,Yuze Dong,Bao Zhang,Yaqing Feng
How to graft co-sensitizers with different binding strengths onto TiO2 surfaces for enhancing the performance of dye-sensitized solar cells (DSSCs) has not been discussed very much. Herein a ruthenium-based sensitizer (N719) and a porphyrin molecule (LP-2) with complementary absorption spectra (300–750 nm) have been chosen to investigate how the dye loading procedure would influence the photovoltaic performance of co-sensitized solar cells. Interestingly, it is found that 54.7% of the loading amounts of pre-adsorbed LP-2 are replaced by the post-adsorption of N719. The replacement adsorption is not observed when the two molecules are loaded in reverse order, which is attributed to their different adsorption configurations and binding energies. The competitive adsorption between co-sensitizers is thus systematically investigated by UV-visible absorption spectroscopy, energy dispersive spectrometry (EDS) and electron probe microanalysis (EPMA). Upon optimization, the device sequentially sensitized with LP-2 and N719 exhibits efficiency (7.72%) enhancement of 38.6% and 18.0% compared with those fabricated with single LP-2 and N719, respectively. The results provide a new vision on the stepwise sensitization of TiO2 films using co-sensitizers with a difference in adsorption properties, suggesting that complementary spectral absorption of co-sensitizers can lead to excellent cell performance by choosing an appropriate dye loading procedure.
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JOURNAL OF MOLECULAR LIQUIDS
·
2016
·
IF 2.74
Tianxiang Zhao,Xi Feng,Wentao Zheng,Xingbang Hu,Jianbin Zhang,Youting Wu
In a previous work, the binary mixture of polyethylene glycol 200 (PEG) and dimethyl sulfoxide (DMSO) was used as a promising medium for absorption of SO 2 ( J. Chem. Eng. Data 2015 , 60 , 2135). As a continuation of the previous study, the solubility data of dilute SO 2 in the binary mixture of PEG + DMSO were measured by isothermal gas-liquid equilibrium experiments at 298.15 K and 122.66 kPa with SO 2 partial pressure below 128 Pa in the gas phase. The solubility of SO 2 decreased gradually with increasing mass fraction of PEG in the mixtures. We found that the absorption process, which obeyed Henry's law within the given experimental conditions, was physical absorption , and Henry's constants were further calculated from solubility data. Furthermore, to obtain important information about the absorption mechanism, the inter-molecular interactions among SO 2 , PEG, and DMSO were investigated by UV, FTIR, and 1 H NMR spectroscopic techniques. Spectral results showed that the interactions among SO 2 , PEG, and DMSO were resulted from both intermolecular hydrogen bonding and the O → S charge-transfer interaction.
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Nanoscale
·
2017
·Vol. 9
·期 28
·9913-9920
·
IF 7.367
Javid Khan,Jiuwang Gu,Shiman He,Xiaohui Li,Gulzar Ahmed,Zhongwu Liu,Muhammad Nadeem Akhtar,Wenjie Mai,Mingmei Wu
A tri-layered photoelectrode for dye-sensitized solar cells (DSSCs) is assembled using single crystal hollow TiO2 nanoparticles (HTNPs), sub-micro hollow TiO2 mesospheres (SHTMSs) and hierarchical TiO2 microspheres (HTMSs). The bottom layer composed of single crystal hollow TiO2 nanoparticles serves to absorb dye molecules, harvest light due to its hollow structure and keep a better mechanical contact with FTO conducting glass; the middle layer consisting of sub-micro hollow mesospheres works as a multifunctional layer due to its high dye adsorption ability, strong light trapping and scattering ability and slow recombination rates; and the top layer consisting of hierarchical microspheres enhances light scattering. The DSSCs made of photoanodes with a tripartite-layer structure (Film 4) show a superior photoconversion efficiency (PCE) of 9.24%, which is 7.4% higher than a single layered photoanode composed of HTNPs (Film 1: 8.90%), 4.6% higher than a double layer-based electrode consisting of HTNPs and SHTMSs (Film 2: 9.03%) and 2.6% higher than a double layer-based electrode made of HTNPs and HTMSs (Film 3: 9.11%). The significant improvements in the PCE for tri-layered TiO2 photoanodes are mainly because of the combined effects of their higher light scattering ability, long electron lifetime, fast electron transport rate, efficient charge collection and a considerable surface area with high dye-loading capability. This study confirms that the facile tri-layered photoanode is an interesting structure for high-efficiency DSSCs.
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CRYSTENGCOMM
·
2016
·Vol. 19
·期 2
·325-334
·
IF 3.849
Javid Khan,Jiuwang Gu,Yuying Meng,Zhisheng Chai,Shiman He,Qili Wu,Shengfu Tong,Gulzar Ahmed,Wenjie Mai,Mingmei Wu
In this paper, we successfully synthesized anatase TiO2 hierarchical microspheres (S0), anatase TiO2 sub-micro hollow mesospheres (S50), anatase TiO2 single crystal hollow nanoparticles (S100), nanoparticles (S250) and (S500) by using different amounts of hydrofluoric acid (HF) versus titanium n-tetrabutoxide (TBT) and acetic acid (AcOH). The structure and morphology of the as-prepared materials were confirmed by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The DSSCs (dye-sensitized solar cells) based on anatase single crystal hollow TiO2 nanoparticles (S100) as a photoanode showed an efficient power conversion efficiency of 8.94% along with a current density of 17.39 mA cm−2 and an open circuit voltage of 778 mV, which is higher than the DSSCs based on S0 (8.10%), S50 (8.57%), S250 (7.25%) and S500 (6.12%). The high performance of S100 as a DSSC is attributed to their hollow structure which might help to harvest more light, higher light scattering and trapping abilities and comparatively higher surface area. Therefore, we can expect that our materials are promising for assembling superior photoelectrodes for future preparation of highly-efficient DSSCs and may lead to applications for energy storage, water splitting, catalysis, and gas sensing.
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