Nanoscale Research Letters
·
2015
·Vol. 10
·期 1
·1-7
·
IF 2.779
Ye Jian,Li Xueliang,Zhao Jianjun,Mei Xuelan,Li Qian
Two-dimensional (2D) material has many advantages including high carrier mobilities and conductivity, high optical transparency, excellent mechanical flexibility, and chemical stability, which made 2D material an ideal material for various optoelectronic devices. Here, we developed a facile method of preparing MoS 2 nanosheets followed by a facile liquid exfoliation method via ethyl cellulose-assisted doping and utilizing a plasma-induced p-doping approach to generate t effectively the partially oxided MoS 2 (p-MoS 2 ) nanosheets from the pristine n-type nanosheets. Moreover, an n-p junction type MoS 2 photodetector device with the built-in potentials to separate the photogenerated charges is able to significantly improved visible light response. We have fabricated photodetector devices consisting of a vertically stacked indium tin oxide (ITO)/pristine n-type MoS 2 nanosheets/p-MoS 2 /Ag structure, which exhibit reasonably good performance illumination, as well as high current values in the range of visible wavelength from 350 to 600 nm. We believe that this work provides important scientific insights for photoelectric response properties of emerging atomically layered 2D materials for photovoltaic and other optoelectronic applications.
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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
·
2020
·
IF 1.27
Yixiao Li,Jing Li,Jinfeng Du,Changfan Zhang,Xiaoyan Wang,Qingpei Xiang,Chuanfei Zhang
The thermoelectric materials working in radioisotope thermoelectric generators or space reactor power system will be exposed to neutron irradiation in space missions . Herein, the influences of neutron irradiation with doses of 10 13 n/cm 2 and 10 15 n/cm 2 on the transport properties of p- and n-type Half-Heusler thermoelectric alloys were investigated. It was found that, neutron irradiation showed negative effects on thermoelectric properties of p-type Hf 0.5 Zr 0.5 CoSb 0.85 Sn 0.15 and p-type Hf 0.5 Ti 0.5 CoSb 0.85 Sn 0.15 . But neutron irradiation had no effects on thermoelectric properties of n-type Hf 0.5 Zr 0.5 NiSn 0.985 Sb 0.015 and n-type ZrNiSn 0.985 Sb 0.015 . After 10 15 n/cm 2 neutron irradiation, the electrical conductivity , power factor and ZT of p-type Half-Heusler alloys decreased by 7–22%, which was caused by the decreased carrier concentration. However, the radiation-induced changes in the thermoelectric properties proved to be essentially healed by annealing at 773 K ~ 873 K. The anti-annealing effects were also studied.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yu Jia,Xuehui Gao,Changqing Teng,Xiaoyu Li,Yi Liu,Mingjia Zhi,Zhanglian Hong
Hydrogen evolution reaction (HER) is a crucial half-reaction of water splitting to produce possible future energy carrier: H 2 , which is directly associated with the conversion and storage of clean energy. There is a great demand on efficient earth-abundant electrocatalysts to replace Pt, especially in alkaline medium . Herein, we report Co 2 Ni alloy anchored on nitrogen-doped carbon nanotubes (Co 2 Ni alloy/N-CNTs) as an efficient alkaline HER electrocatalyst. The alloy is prepared from a straightforward hydrothermal reaction and a post-annealing process in NH 3 atmosphere, which in situ reduces the nickel cobalt carbonate hydroxide precursor to alloy and brings N-doping to CNTs without changing original morphology. The as-obtained Co 2 Ni alloy/N-CNTs hybrids exhibit superior alkaline HER performance with a small Tafel slope of 87 mV dec −1 , high exchange current density of 0.8 mA cm −2 and a low overpotential of 100 mV to drive current density of 10 mA cm −2 , which is comparable to commercial Pt/C and surpasses numerous reported earth-abundant electrocatalysts . This electrocatalyst can also endure long-time HER process (>24 h). The excellent catalytic performance can be attributed to accelerated charge transfer, more exposed active sites and structural robustness which all benefit from the structural and component configuration that brought by alloy and N-doped CNTs.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2013
·Vol. 24
·期 2
·315-320
·
IF 1.174
Yao Zhenxing,Wang Mingquan,Sun Shaohua,Jia Ruibao,Li He
Carbon tetrachloride (CCl 4 ) is a kind of toxic and persistent groundwater contaminant. Considering keeping drinking water safe, a novel kind of N-doped graphene (NGS)-P25 TiO 2 photocatalyst was prepared by a facile one-step hydrothermal method for the removal of CCl 4 from contaminated water. Simultaneously, nitrogen-doping and the reduction of graphene oxide, and loading of P25 were finished during the same process. The photocatalytic efficiency of resulted NGS-P25 nanoparticles was studied for the degradation of CCl 4 . The results indicated that NGS-P25 exhibited the highest photocatalytic activity under UV light irradiation, outperforming graphene-P25, bare P25 or NGS. The effects of NGS-P25 dosage, irradiation time, CCl 4 concentration and pH on CCl 4 photocatalytic degradation efficiency were discussed in detail. Accordingly, the optimum experimental conditions were obtained. Moreover, the high performance photocatalyst of NGS-P25 can be extended to environmental pollution control and remediation towards various pollutants.
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Desalination and Water Treatment
·
2024
·
IF 1
Liuyi Yin,Hui Zhao,Guangying Chen,Yongyan Xu,Yongxing Chen,Yongbo Li
Salt-containing vapor-liquid equilibrium for the n-propanol + water system was obtained experimentally at atmospheric pressure using a modified Othmer still. The studied salts include lithium chloride (LiCl), sodium chloride (NaCl), potassium chloride (KCl), potassium bromide(KBr) and potassium iodide (KI). The experimental vapor-liquid equilibrium data was compared with that calculated using the LIFAC model. The average relative deviation between experimental data and the correlation are –0.24%, –1.42%, –0.29%, –1.33% and 0.23% for LiCl, NaCl, KCl, KBr and KI, respectively. The corresponding standard deviations are 2.06%, 2.83%, 2.27%, 2.71%, and 2.11%. From these results, it may be seen that the new experimental data for the vapor-liquid equilibrium of the ternary system (n-propanol + water +salt) and the predictive thermodynamic model LIFAC can be used to estimate the influence of the salts on the VLE of the n-propanol + water system. Furthermore, the effect of different salts on relative volatility was studied.
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Science China-Materials
·
2020
·Vol. 63
·期 9
·1769-1778
·
IF 6.098
Xu Jingjing,Wu Hongping,Yu Hongwei,Hu Zhanggui,Wang Jiyang,Wu Yicheng
Alike phosphates, silicates and germanates exclusively containing tetrahedral basic building units (BBUs) can also exhibit ultraviolet (UV) even deep-UV transitions. They are important for the design of new UV or deep-UV nonlinear optical (NLO) materials. In this paper, four new alkali metal silicates and germanates, Li 2 Rb 4 Si 6 O 15 , Li 2 Cs 4 Si 6 O 15 , Li 3 Rb 3 Ge 6 O 15 and Li 3 Cs 3 Ge 6 O 15 were successfully synthesized by a high temperature solid state reaction. They obey the general formula of Li m A n M 6 O 15 (A=Rb, Cs; M=Si, Ge; m+n =6) and all exhibit the Sr 2 Be 2 B 2 O 7 (SBBO)-like structures. More importantly, Li 3 Rb 3 Ge 6 O 15 and Li 3 Cs 3 Ge 6 O 15 crystallize in the noncentrosymmetric (NCS) structures and exhibit remarkable phase-matched second harmonic generation (SHG) effect, 0.8×KH 2 PO 4 (KDP) and 1×KDP, respectively. These indicate that they are potential as UV or deep-UV NLO materials. Furthermore, their optical and NLO properties as well as thermal properties were measured. The structure-property relationships were studied by the dipole moment calculations and the first-principles calculations.
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CATALYSIS LETTERS
·
2015
·Vol. 145
·期 4
·1014-1021
·
IF 2.307
Li Yan,Li Bing,Geng Longfei,Wang Jun,Wang Yong,Huang Jun
Vanadium catalysts supported on N-doped carbon materials (CN) were prepared and the catalyst VOSiW showed high activity for the hydroxylation of various aromatics with O 2 . Aromatics with electron-withdrawing groups such as CN, NO 2 , COOH, CF 3 , COCH 3 and aromatic halides (F, Cl and Br) were oxygenated to the corresponding phenols in considerable yields. The CN materials were not only indispensable for the reusability of the vanadium catalyst VOSiW, but also favorable to the high catalytic activity. The VOSiW catalyst is ready for the hydroxylation of aromatics with O 2 as both V 4+ and V 5+ species are coexisted in the VOSiW catalyst. Graphical
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Zhi Yang,Siqi Wang,Yuejun Sun,Yu Xiao,Li-Dong Zhao
The n -type PbTe still maintains relatively low thermoelectric performance compared with its p -type counterpart. Thus, to promote its performance in n -type PbTe, we conduct successive strategies that firstly suppressing the lattice thermal conductivity ( κ lat ) through alloying with ternary compound AgSbSe 2 , and then optimizing carrier density with Sb, Bi or I doping. In AgSbSe 2 -alloyed PbTe samples, the κ lat can be evidently reduced, and the minimum κ lat decreases from ∼1.1 Wm −1 K −1 in undoped PbTe to ∼0.8 Wm −1 K −1 in PbTe–5%AgSbSe 2 . Based on PbTe–5%AgSbSe 2 matrix, several dopants (Sb, Bi or I) are used to optimize its carrier density, and found that I element is verified to be the most effective dopant to enhance its electrical transport properties. In I-doped PbTe–5%AgSbSe 2 samples, the carrier density raises from ∼2.49 × 10 16 cm −3 in PbTe–5%AgSbSe 2 to ∼1.15 × 10 19 cm −3 in PbTe 0.992 I 0.008 -5%AgSbSe 2 , which contributes to the maximum power factor ∼14.8 μWcm −1 K −2 . Combining the reduced lattice thermal conductivity and improved power factor, the maximum ZT max and average ZT ave values in PbTe 0.992 I 0.008 -5%AgSbSe 2 are boosted to ∼1.0 at 723 K and ∼0.77 at 300–823 K, respectively. This work points out a valid avenue to improve thermoelectric transport property in n -type PbTe with separately successive strategies to adjust its thermal and electrical performance.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yu Xiao,Wei Li,Cheng Chang,Yuexing Chen,Li Huang,Jiaqing He,Li-Dong Zhao
We report n-type PbTe with a maximum ZT ∼1.2 at 673 K and an average ZT ave ∼0.84 at 300–823 K, which was achieved through a Sn and Se co-alloying approach. We find that the lattice thermal conductivity can be largely reduced through introducing Se in Te sites, and the power factor can be enhanced through introducing Sn in the Pb sites. Combining two strategies via Se and Sn co-alloying in PbTe, results show that the lattice thermal conductivity at 300 K can be reduced from ∼3.1 Wm −1 K −1 to ∼1.2 Wm −1 K −1 after alloying 15% Se, which is consistent with the Callaway model. Meanwhile, we find that both carrier concentration and mobility can be enhanced through alloying small amount of Sn, which are supported by DFT calculation with emphasis on the defect formation energies . The improvement on electrical conductivity elucidates an enhanced power factor at 300 K increasing from ∼6.4 μWcm −1 K −2 to ∼14.6 μWcm −1 K −2 . Through synergistically optimizing electrical and thermal transport properties of n-type PbTe via Sn and Se co-alloying, the ZT value is distinctly enhanced to 1.2 at 673 K, and the average ZT ave value is improved by ∼35%, from ∼0.62 in PbTe 0.997 I 0.003 to ∼0.84 in Pb 0.995 Sn 0.005 Te 0.847 Se 0.15 I 0.003 , ensuring a high maximum thermoelectric conversion efficiency ∼10.7%.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 16
·47025-47037
·
IF 5.8
Wang Tianyu,Yang Lang,Rao Feng,Jiang Kaixi,Byrynnai Choduraa
Adding organics in the process of geopolymer synthesis can combine the functional groups of organics with the three-dimensional structure of geopolymer, thus changing the properties of geopolymer such as compressive strength, flexural strength, and acid resistance. In this work, excellent mechanical properties and acid resistance of metakaolin-blast furnance slag (Mk-BFS)-based geopolymer were synthesized by the incorporation of chitosan. The formation of sodium-alumino-silicate-hydrate (N-A-S–H) gel and calium-alumino-silicate-hydrate (C-A-S–H) gel in geopolymerization were characterized by 29 Si nuclear magnetic resonance (NMR). At 5% of chitosan, the compressive strength of Mk-BFS-based geopolymer could reach to 33.7 MPa. The results could be ascribed to that chitosan reacts with geopolymer to generate new C-O-Si structure meanwhile adhesion produced by the combination of positively charged cations and negatively charged ions makes the structure of geopolymer denser. After 7 days of sulfuric acid immersion, the reduction of compressive strength is less than 3 MPa, demonstrating its great acid resistance. The acid resistance of Mk-BFS-based geopolymer could attribute to that the free amino groups in chitosan preferentially react with acid solution and weakened the erosion of sulfuric acid. This study optimizes the compressive strength and acid resistance of geopolymer by adding appropriate amount of chitosan.
研究领域:
材料科学
·
硅酸盐化学
·
无机非金属材料
·
功能复合材料
·
建筑材料
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高影响因子
Science China-Materials
·
2018
·Vol. 62
·期 4
·519-526
·
IF 4.318
Zhang Busheng,Lei Yan,Qi Ruijuan,Yu Haili,Yang Xiaogang,Cai Tuo,Zheng Zhi
Both bismuth and copper are non-toxic and earth-abundant elements suitable for lead-free halide perovskite-like photovoltaic devices. Here, we report a highly facile route for in-situ producing copper-bismuth-iodide (CuBiI 4 ) thin films directly on ITO substrate at room temperature, by utilizing a Bi-Cu alloy layer as precursor. X-ray diffraction and transmission electron microscopy (TEM) results verified the formation of well crystallized CuBiI 4 thin films with [222] orientation. The transient photovoltage (TPV) analysis revealed that the CuBiI 4 is an n-type semiconductor with a suitable band gap of ~1.81 eV, preferable to photoelectric conversion compared with CH 3 NH 3 PbI 3 . It is very interesting that the subsequent spin-coating process of the classical Spiro-MeOTAD organic solution with TBP and acetonitrile resulted in a dense and smooth CuBiI 4 :Spiro-MeOTAD bulk-heterojunction film. The preliminarily fabricated simple sandwich structures of ITO/CuBiI 4 :Spiro-MeOTAD/Au hybrid solar cell devices displayed efficient photovoltaic performance with the PCE up to 1.119% of the best sample. The room temperature direct metal surface elemental reaction (DMSER) method may provide a new insight for all-inorganic lead free perovskite-like A a B b X x compounds and high performance photovoltaic devices.
研究领域:
材料科学
·
光伏技术
·
无机化学
·
半导体物理
·
能源材料
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Xiang Zhou,Yu-Mei Feng,Pu-Ying Qi,Wu-Bin Shao,Zhi-Bing Wu,Li-Wei Liu,Yi Wang,Hao-Dong Ma,Pei-Yi Wang,Zhong Li,Song Yang
Xanthomonas oryzae pv. oryzae (Xoo) is an offensive phytopathogen that can invade a wide range of plant hosts to develop bacterial diseases, including the well-known rice bacterial leaf blight. However, few agrochemicals have been identified to effectively prevent and eliminate Xoo-induced diseases. Thus, designing novel antibacterial compounds on the basis of the potential targets from Xoo may lead to the discovery of highly efficient and innovative anti-Xoo agents. Filamentous temperature-sensitive protein Z (FtsZ), an important functional protein in the progression of cell division, has been widely reported and exploited as a target for creating antibacterial drugs in the field of medicine. Therefore, the fabrication of innovative frameworks targeting XooFtsZ may be an effective method for managing bacterial leaf blight diseases via blocking the binary division and reproduction of Xoo. As such, a series of novel N-(cinnamoyl)-N′-(substituted)acryloyl hydrazide derivatives containing pyridinium moieties were designed, and the anti-Xoo activity was determined. The bioassay results showed that compound A7 had excellent anti-Xoo activity (EC50 = 0.99 mg L–1) in vitro and distinct curative activity (63.2% at 200 mg L–1) in vivo. Further studies revealed that these designed compounds were XooFtsZ inhibitors, validating by the reduced GTPase activity of recombinant XooFtsZ, the nonfilamentous XooFtsZ assembly observed in the TEM images, and the prolonged Xoo cells from the fluorescence patterns. Computational docking studies showed that compound A7 had strong interactions with ASN34, GLN193, and GLN197 residues located in the α helix regions of XooFtsZ. The present study demonstrates the developed FtsZ inhibitors can serve as agents to control Xoo-induced infections.
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