Nano Research
·
2021
·Vol. 15
·期 3
·1809-1816
·
IF 8.897
Geng Shuo,Tian Fenyang,Li Menggang,Liu Yequn,Sheng Jie,Yang Weiwei,Yu Yongsheng,Hou Yanglong
The hydrogen evolution reaction (HER) of molybdenum disulfide (MoS 2 ) is limited in alkaline and acid solution because the active sites are on the finite edge with extended basal plane remaining inert. Herein, we activated the interfacial S sites by coupling with Ru nanoparticles on the inert basal plane of MoS 2 nanosheets. The density functional theory (DFT) calculation and experimental results show that the interfacial S electronic structure was modulated. And the results of Δ G H* demonstrate that the adsorption of H on the MoS 2 was also optimized. With the advantage of interfacial S sites activation, the Ru-MoS 2 needs only overpotential of 110 and 98 mV to achieve 10 mA·cm −2 in both 0.5 M H 2 SO 4 and 1 M KOH solution, respectively. This strategy paves a new way for activating the basal plane of other transition metal sulfide electrocatalysts for improving the HER performance.
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Nano Research
·
2021
·Vol. 16
·期 4
·4506-4514
·
IF 8.897
Yang Yi,Cheng Bei,Yu Jiaguo,Wang Linxi,Ho Wingkei
Photocatalytic production of hydrogen peroxide (H 2 O 2 ) is an ideal pathway for obtaining solar fuels. Herein, an S-scheme heterojunction is constructed in hybrid TiO 2 /In 2 S 3 photocatalyst, which greatly promotes the separation of photogenerated carriers to foster efficient H 2 O 2 evolution. These composite photocatalysts show a high H 2 O 2 yield of 376 µmol/(L·h). The mechanism of charge transfer and separation within the S-scheme heterojunction is well studied by computational methods and experiments. Density functional theory and in-situ irradiated X-ray photoelectron spectroscopy results reveal distinct features of the S-scheme heterojunction in the TiO 2 /In 2 S 3 hybrids and demonstrate charge transfer mechanisms. The density functional theory calculation and electron paramagnetic resonance results suggest that O 2 reduction to H 2 O 2 follows stepwise one-electron processes. In 2 S 3 shows a much stronger interaction with O 2 than TiO 2 as well as a higher reduction ability, serving as the active sites for H 2 O 2 generation. The work provides a novel design of S-scheme photocatalyst with high H 2 O 2 evolution efficiency and mechanistically demonstrates the improved separation of charge carriers.
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SOLID STATE IONICS
·
2018
·
IF 2.751
Yuelong Xu,Shasha Wang,Meifang Yan,Lihui Zhang,Zhenfa Liu
Heteroatom doping in carbon aerogels is critical for improving the surface areas and electronic properties of these aerogels. This paper demonstrates doping sulfur (S) atom into carbon aerogels. S-doped carbon aerogels (S-CAs) were prepared via a sol-gel process using phloroglucinol (P), resorcinol (R) and formaldehyde as the polymerization precursors with sodium carbonate (Na 2 CO 3 ) as the basic catalyst and sodium 4-hydroxybenzenesulfonate (HBS) as the surfactant . The as-synthesized products were dried in normal temperature and carbonized with temperature-programmed. The effects of S-doping on the surface area and electronic properties of the S-CAs were studied by a surface area analyzer and electrochemical workstation. When the S loading was up to 1.38%, the corresponding S-CA exhibited the most optimal surface area and specific capacitance. The textural properties were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), a surface area analyzer, an X-ray diffraction spectrometer, a Raman spectrometer, the X-ray photoelectron spectroscopy (XPS) spectra, an elemental analyzer and an EDX detector, and the electrochemical properties were measured using cyclic voltammetry , galvanostatic charge–discharge measurements and electrochemical impedance spectroscopy (EIS). When the molar ratio of HBS/(P + R) was 0.05, the S loading was 1.38%, the specific surface area of the as-synthesized CA was 831 m 2 /g, and its specific capacitance was 105 F/g.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 59
·15897-15902
·
IF 5.16
Binshen Wang,Yongan Feng,Xiujuan Qi,Mucong Deng,Junjun Tian,Qinghua Zhang
Graphical Going off with a bang ! A series of novel explosive poly(ionic liquid)s (E-PILs) are designed and prepared by introducing an energetic nitrato group and nitro-rich anions into polymeric chains. All E-PILs show higher detonation performances than state-of-the-art energetic polymers. The E-PILs are promising candidates for applications as binders and/or plasticizers for explosive formulations. The development of ionic-liquid-derived functional materials would be vital for stimulation of the interdisciplinary research in the fields of ionic liquid chemistry and material science. Here, a series of novel poly(ionic liquid)s with explosive capability were designed and prepared by introducing the energetic nitrato group and nitro-rich anions, such as nitrate, dinitramide, and nitroform into the polymeric chains. The as-synthesized explosive poly(ionic liquid)s (E-PILs) were fully characterized, and their physicochemical and detonation properties were investigated. All E-PILs show higher detonation performances than state-of-the-art energetic polymers including glycidyl azide polymer (GAP) and poly(glycidyl nitrate) [poly(GLYN)]. Some E-PILs exhibit higher calculated detonation velocities and pressures than 2,4,6-trinitrotoluene (TNT). These E-PILs are promising candidates for applications as new high-performance energetic polymers.
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MACROMOLECULAR RESEARCH
·
2012
·Vol. 21
·期 6
·681-686
·
IF 1.153
Xu Yewei,Tang Jie,Chang Guanjun,Zhu Fanghua,Luo Xuan,Zhang Lin
Poly( N -arylenebenzimidazole ketone ketone)s (PNABIKKs) consisting of m - and p -phenylene linkages have been synthesized by nucleophilic aromatic substitution from bis(benzimidazolyl) derivatives containing sulfonyl, carbonyl, and ether groups with activated aromatic difluorides in sulfolane at 210 °C in the presence of anhydrous potassium carbonate. The structures of the polymers were characterized by means of Fourier tramsfom infrared (FTIR), proton nuclear magnetic resonance ( 1 H NMR) spectroscopy, and elemental analysis, and the results were largely consistent with the proposed structure. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) measurements demonstrated that polymers had high glass transition temperatures ( T
g
>220 °C) and good thermal stability with high decomposition temperatures ( T
D
>480 °C). These novel polymers also showed good solubility.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2014
·
IF 5.03
Wangen Zhao,Gang Wang,Qingwen Tian,Lijian Huang,Shang Gao,Daocheng Pan
Cu 2 CdSn(S,Se) 4 is an important candidate material for thin film solar cell absorber layers . In this work, low-cost Cu 2 CdSnS 4 nanocrytal thin film with a stannite structure has been successfully fabricated by a butyldithiocarbamate-based ethanol solution approach. The selenized Cu 2 CdSn(S,Se) 4 thin film shows large densely packed grains and has a suitable band gap value of 1.01 eV. The Cu 2 CdSn(S,Se) 4 thin film solar cell with a proof-of-concept power conversion efficiency of 3.1% was fabricated.
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2013
·Vol. 51
·期 17
·3667-3673
·
IF 3.543
Weipu Zhu,Hong Du,Ying Huang,Shuai Sun,Ning Xu,Huagang Ni,Xia Cai,Xiaodong Li,Zhiquan Shen
Biodegradable poly(ester-phosphoester)s bearing multiple chloroethyl groups were synthesized facilely by the ring-opening copolymerization of 2-(2-chloroethoxy)-2-oxo-1,3,2-dioxaphospholane (CEP) and ε-caprolactone (CL) in the presence of lanthanum tris(2,6-di-tert-butyl-4-methylphenolate)s (La(DBMP) 3 ) as single-component catalyst under mild conditions. Then the quaternization reaction was carried out between the halide copolymers and a series of N,N -dimethyl alkylamines to give poly(ester-phosphoester)s containing ammonium groups with various charge density and alkyl chain length. The antibacterial properties of these cationic poly(esterphosphoester)s were evaluated by OD600 and zone of inhibition methods against gram-negative ( Escherichia coli ) and gram-positive ( Staphylococcus aureus ) bacteria. Cationic poly(esterphosphoester)s with long alkyl chain on the ammonium groups show excellent antibacterial activity for both gram-negative and gram-positive bacteria even with low charge density. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 3667–3673
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POLYMER INTERNATIONAL
·
2017
·Vol. 66
·期 11
·1633-1639
·
IF 2.07
Nafeesa Mushtaq,Lala Rukh Sidra,Guofei Chen,Yongmei Tang,Lubo Xu,Xingzhong Fang
A series of cardo based asymmetric polyimides containing bulky rigid naphthalimide and phthalimide groups were prepared from asymmetric monomer bishaloimide and bisphenols by solution polycondensation. Bishalo(naphthalimide-phthalimide) monomers containing different terminal leaving groups (Cl, F, NO 2 ) were synthesized, and the reactivity difference of these monomers was compared for the successful synthesis of polyimides. The inherent viscosities of the polyimides were in the range 0.51 − 0.60 dL g −1 in N -methyl-2-pyrrolidone at 30 °C. These polyimides demonstrated good organosolubility and mechanical properties with tensile strengths of 93 − 120 MPa, tensile moduli of 3.5 − 5.3 GPa and elongations at break of 2.8% − 4.3%. The polyimides showed high glass transition temperatures ( T g ) ranging from 330 to 363 °C. The 10% weight loss ( T 10% ) of asymmetric polyimides reached 436 − 500 °C in nitrogen and 417 − 476 °C in air. The water uptake of the polyimides was in the range 0.35% − 0.72%. © 2017 Society of Chemical Industry
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JOURNAL OF MATERIALS RESEARCH
·
2017
·Vol. 32
·期 18
·3585-3592
·
IF 1.673
Xinjun Shi,Jinju Zheng,Minhui Shang,Tingting Xie,Jiangbo Xie,Sheng Cao,Weiyou Yang
In this work, we reported the growth of cadmium-free Ag-doped Zn–In–S nanocrystals (NCs) with effective photoluminescence (PL) via a hot-injection strategy. The effects of the nucleation temperatures, reaction times, and Ag-doping concentrations on the PL properties of Ag-doped Zn–In–S NCs were investigated systematically. The as-synthesized NCs exhibit color-tunable PL emissions covering a broad visible range of 472–585 nm. After being passivated by a protective ZnS shell, the PL quantum yield (QY) of the resultant NCs was greatly improved up to 33%. With the increase of the Ag-doping level, the PL is significantly intensified due to the improved concentration of Ag ions which provides more holes to recombine with electrons from the bottom of the conduction band. This also makes the emission via the dopant energy level become a powerful, competitive advantage for the NCs with higher Ag-doping levels, resulting in a longer lifetime and higher PL QY. These results suggest that tailoring the Ag-doping level can be a powerful strategy to control the optical properties of Ag-doped Zn–In–S NCs.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Bowen Xing,Min Zhang,Zhenya Zhang,Xiaolong Yao
In this study, In-doped SnS 2 nanostructures were synthesized by a one-step hydrothermal method. Characterization results demonstrated that S vacancies were successfully constructed in the synthesized material. Samples doped with different masses of indium were prepared. Among them, the In/V s2 -SnS 2 sample with moderate sulfur vacancy content the In/V s2 -SnS 2 showed the best ammonia detection response (500 ppm) at room temperature, and the peak response reached 2392. Moreover, the sensor exhibited a response/recovery time of 37.5s/3.3s. The adsorption energies of ammonia on the pure phase SnS 2 surface and S vacancies were determined by the first principle DFT calculations. The theoretical analysis agreed well with the experimental results, suggesting that the S vacancies provided more active sites for effective adsorption, favoring the sensitive detection of ammonia molecules. The proposed study demonstrates that In-doping created S vacancies in SnS 2 , which is promising for gas sensitization, laying the foundation for high-performance room-temperature gas sensors.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Fajun Li,Yuqi Ma,Rui Xu,Jingyang Chen,Shujin Kan,Guizhi Wang,Haifeng Xu,Zhong Jin
Low-cost, highly active, and robust electrocatalysts are needed for more efficient H 2 production from water splitting, herein, we present an amorphous MoS 2 -Ni 3 S 2 heterostructure on the nickel foam (NF) substrate via a facile hydrothermal treatment and a one-step electrodeposition approach. The S 2 2 - sites in the fabricated electrocatalyst could be conveniently modulated by synthesis conditions. The optimized amorphous MoS 2 -Ni 3 S 2 @NF-24 shows an excellent electrocatalytic activity for HER with the overpotential of 58 mV at 10 mA cm −2 and stabilizes for over 50 h when used as a bifunctional catalyst for overall water splitting in 1 M KOH electrolyte at room temperature. Experimental characterizations and DFT calculations demonstrate that the excellent electrocatalytic performance of the fabricated heterostructure could be attributed to the synergistic effect of the proper hydrogen binding free energies of MoS 2 with abundant bridging S 2 2 - and the strong adsorption of OH − to the Ni 3 S 2 . This work proposed a finely designed MoS 2 -based hybrid catalyst for efficient alkaline HER, thus providing insights into the design and fabrication of inexpensive electrocatalysts for wide range of applications.
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mSystems
·
2024
·
IF 5
Jiaming Zhang,Xiaoxia Yu,Weidong Li,Yunjing Jiang,Liangran Zhang,Shunxin Wang
A good quality egg is essential for a successful pregnancy and early embryo development. Oocyte development is vulnerable to environmental exposures. Bisphenol S (BPS) is widely used as a replacement for its analog bisphenol A, but the reproductive toxicity of BPS has been of great concern. In this study, we showed that BPS exposure induces dysbiosis of the gut microbiota, which further leads to intestinal permeability and inflammation, and ultimately impairs oocyte quality. More importantly, we found that alginate oligosaccharide reshapes the gut microbiota to improve gut homeostasis, thereby preventing the deleterious effects of BPS on the gut and oocytes. Overall, this study not only demonstrates that BPS exposure impairs the intestine and oocytes by inducing dysbiosis of the gut microbiota but also develops a preventive strategy.
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