VACUUM
·
2022
·
IF 4.11
Peng Su,Wei Li,Jie Zhang,Xiaoling Xie
Detecting some appropriate target gases through the optimization of material structure is still applicable to some old sensing materials. In this work, we showed that hollow tin oxide (SnO 2 ) nanotubes (NTs) exhibited a remarkable sensing performance for nitric oxide (NO) at 160 °C. The sensing materials were prepared by direct annealing of electrospun precursor nanofibers , and hollow NTs can be obtained at an appropriate heating rate of 6 °C/min. Given the large surface area of hollow SnO 2 NTs, their sensing performance is better than that of solid SnO 2 NTs. The response of hollow SnO 2 NTs is approximately 33.3 upon exposure to 500 ppb of NO at 160 °C. The hollow SnO 2 NTs also exhibit good repeatability, long-term stability, and excellent selectivity . These remarkable sensing properties indicate that conventional SnO 2 still has great practical applications because of the fine design of the material structure and proper control of working conditions.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Ruijie Wu,Liang Tian,Hao Li,Huabin Liu,Jiaxin Luo,Xuemin Tian,Zhongqiu Hua,Yi Wu,Shurui Fan
Gas sensors based on metal oxide semiconductor adduce a low cost and reliable solution for the leakage detection of methane, which is highly explosive. However, it is a fact that MOS gas sensors suffer from a heavy cross sensitive response to volatile organic compounds such as ethanol and acetic acid. With the help of filters, metal oxide semiconductor gas sensors could become quite selective to methane. Here, a novel on-chip microfilter was designed for metal oxide semiconductor gas sensors. The on-chip microfilter is fabricated from porous alumina ceramics loaded with platinum on the surface. The active filter was continuously heated by sensor chips. Whereas, it was kept intact with sensing films and reactive gas molecules have to diffuse through the porous ceramics before reaching the surface of metal oxide semiconductor. It was found that both selective response and sensitive response to methane were enhanced by the on-chip microfilter. This is similar to the reported active filter, which is prepared from catalytic films and deposited directly on the top of sensor layer. Additionally, it was indicated that the on-chip microfilter not only limited to tin dioxide but also valid for indium oxide based on sensors.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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IF 4.598
Deyu Mao,Shenglong Yi,Zirui He,Qiancheng Zhu
Lithium-oxygen (Li-O 2 ) batteries with high theoretical energy density are well developed over the past decade, as the cycle performance and round-trip efficiency had enhanced prominently. However, there are still several obstacles that need to be tackled before commercial application. Among them, proper cathode structure design with low cost stands as a core problem. A Typical type of gas diffusion layer cathode are usually carbon paper, which is valuableness, meanwhile, cannot fit the application of flexible devices. In this work, non-woven fabrics were applied as basis materials to synthesis Fe 3 C/N-doped carbon tubes gas diffusion layer by a simple carbonization method. The resulting carbon cloth can be used directly as binder-free and current collector-free cathode for Li-O 2 batteries. More than 130 stable cycles were achieved. The composite synthesized in this paper has the possibility for future application in flexible lithium-oxygen batteries and provide a new strategy for the recovery of non-woven fabrics.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2022
·Vol. 46
·期 8
·10919-10929
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IF 4.672
Shujie Xue,Qingwei Wang,Guangjun Dai,Minglin Zhao,Shanshan Sun,Nengfei Yu,Qinghong Huang,Yusong Zhu,Lijun Fu,Yuping Wu
Summary Direct methanol fuel cell (DMFC) is considered as one of the next-generation power sources for portable electronic devices. However, the problems of structure and materials of the membrane electrode assembly (MEA) must be resolved if it is applied in flexible electronic devices. The traditional materials of MEA used in DMFC cannot bend and are easy to break. Moreover, the existence of a microporous layer increases the likelihood of separation of the gas diffusion layer (GDL) and catalytic layer. Herein, we develop a simple electrospinning method to prepare flexible titanium carbide/carbon nanofibers (TiC/CNFs) film used as GDL. TiC/CNFs film plays a GDL and a microporous layer dual role. The MEA exhibits enhancing performance and excellent flexibility. The maximum power density of flexible DMFC can reach 20.2 mW/cm 2 , compared with the GDL made of traditional carbon cloth (18.1 mW/cm 2 ), the maximum power density rises by 11.6%. After 50 consecutive bends, the voltage drops less than 10%. This work would promote the flexibility of DMFC.
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高影响因子
JOURNAL OF POLYMER RESEARCH
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2022
·Vol. 29
·期 10
·1-13
·
IF 3.061
Wu Wei-Lian,Lai Shi-Qing,Niu Hong-Chao,Liu Chan-Juan,Zhou Li,Huang Xiao-Hua
Four aromatic fluorinated polyimides (PIs) with bulky pendant were synthesized through one-step polycondensation reaction with a novel diamine 2,6-bis(4-aminophenyl)-4-(3-(1,1,2,2-tetrafluoroethoxy)phenyl)pyridine (AFEPP) and commercially aromatic dianhydrides. The structures of diamine AFEPP and PIs were characterized by NMR and FT-IR. The obtained PIs displayed outstanding heat-resistant performances with glass transition temperature between 225–286 °C, 10% weight loss temperature between 564–605 °C, and the char yields between 61–68% at 800 °C in N 2 atmosphere. Meanwhile, they also presented excellent solubility, and can be dissolved in DMSO, DMF, NMP, DMAc, and THF. Additionally, PIs films have good optical property with the cut-off wavelength transmittance between 356–373 nm, and remarkable hydrophobicity with the contact angles ranged from 90.58° to 93.57°. Moreover, incorporating fluorinated group and bulky pendant into polymer chains could enhance their molecular chain spacing ( d -spacing) and fractional free volume (FFV) values as demonstrated by WAXD and molecular simulation. The results of gas permeability test revealed these polymer membranes exhibit relatively good gas transport performance. Among them, PI-6FDA have the best gas transport performance ( P He = 37.28 barrer, P CO2 = 20.4 barrer) in this study, which is match with its relatively large d -spacing and FFV. In addition, all PI films exhibit good mechanical property with tensile strength range from 44 to 79 MPa.
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ANALYTICAL CHEMISTRY
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2022
·
IF 8.008
Lu Shi,Qiaorong Tang,Bing Yang,Wei Liu,Baoxin Li,Chaoyong Yang,Yan Jin
Cross-reactive sensor arrays are useful for discriminating multiple analytes in a complex sample. Herein, a portable and label-free gas pressure sensor array was proposed for multiplex analysis via a handheld gas pressure meter. It is based on the interaction diversity of analytes with catalase-like nanomaterials, including Pt nanoparticles (PtNP), Co3O4 nanosheets (Co3O4NS), and Pt–Co alloy nanosheets (PtCoNS), respectively. Thus, the diverse influence of analytes on the catalase-like activity could be output as the difference in the gas pressure. By using principal component analysis, eight proteins were well distinguished by the gas pressure sensor array at the 10 nM level within 12 min. Moreover, different concentrations of proteins and mixtures of proteins could likewise be discriminated. More importantly, the effective discrimination of proteins in human serum and discrimination of five kinds of cells further confirmed the potential of the gas pressure sensor array. Therefore, it provides a portable, cheap, sensitive, and label-free gas pressure sensor array, which is totally different from the reported sensor arrays and holds great potential for portable and cheap discrimination of multiple analytes.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Haodong Li,Haoyu Li,Zhiwei Yang,Yizhu Lai,Qing Yang,Pengxin Duan,Zhuo Zheng,Yang Liu,Yan Sun,Benhe Zhong,Zhenguo Wu,Xiaodong Guo
The application value of silicon-based anodes has not been fully realized due to the ∼ 300% volume expansion and poor electronic conductivity. In present study, mesoporous Si/C (MP-Si/C) composite with nanosized primary particles of 30–50 nm and pore diameter of 20–40 nm was proposed, which displays superior Li storage properties. Firstly, Polyacrylic acid (PAA) was applied to fulfill in-situ carbon coating and inhibit the particle growth of SiO 2 generated from tetraethyl orthosilicate (TEOS) in stöber reaction. Secondly, Mg gas was introduced to create nano-sized Si with meso -pores and three-dimensional carbon network via the gas-cutting effect. The cycling stability and rate capability were both significantly enhanced with capacity of 671 mAh/g after 400 cycles and 593 mAh/g after 500 cycles at 2 A/g and 4 A/g, respectively, which was highly relevant to the selection of carbon source PAA and its corresponding carbon coating and Mg reduction effect. Moreover, this method bypasses the use of costly nano-silicon, which provides inspiration for the commercialization of silicon-based anodes.
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PubMed
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
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2022
·
IF 5.168
Qixin Liu,Changlong Liu,Yuan Li,Na Fang,Xiang Yan,Caili Dai,Yongping Huang,Yining Wu
Gas flooding is an effective EOR process for carbonate fractured-vuggy reservoirs worldwide. With the large-scale application of gas flooding, the problem of gas channeling is emerging inevitably and restricts the improvement of oil recovery. Foaming can alleviate such problems due to its high viscosity. However, many factors lead to the poor stability of conventional foam or even gelled-foam in fractured-vuggy reservoirs, such as Ostwald maturation, lack of support from pore-throat units, and weak regeneration ability, dilution of formation water, high temperature, high salinity , etc. Therefore, a novel dual network semi-solidified gelled-foam was designed to solve the gas channeling problem in fractured-vuggy reservoirs. It overcomes the shortcoming of fast foam volume attenuation due to temperature rising. The new foam system consists of an ionic crosslinking network (sodium alginate , Ca 2+ ) and a covalent crosslinking network (acrylamide, polyacrylamide, crosslinking agent). The characteristics of sodium alginate, which can rapidly react with divalent cations (Ca 2+ ) in formation water to generate an ionic crosslinking network, forming a protective film to enhance foam stability in the first stage. Acrylamide, polyacrylamide, and crosslinking agent (methenamine and resorcinol) were used to form the second network (covalent crosslinking network), which can effectively enhance the high temperature stability of the foam. After optimization, the dual network semi-solidified gelled-foam was obtained, and the half-life can reach 15d in a high temperature and high salinity environment (130 °C, 22.37 × 10 4 mg/L). Meanwhile, the new foam system also showed higher viscosity, high oil tolerance and plugging capability. This unique designed gelled-foam offers high application potential in deep fractured-vuggy reservoirs. It effectively solves the gas channeling problem in gas flooding production in fractured-vuggy reservoirs worldwide.
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高影响因子
Journal of Cleaner Production
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2022
·
IF 11.072
Chang Chen,Fentian Ma,Tingshu He,Zeqian Kang,Yubin Wang,Chen Shi
Flue gas desulfurization gypsum blocks were prepared using polymethylhydrosiloxane as a waterproofing and antiefflorescence agent, flue gas desulfurization gypsum as the matrix, and fly ash as the mineral admixture . The mechanical properties, water absorption, softening coefficient, surface contact angle, phase composition, and microstructure of the flue gas desulfurization gypsum blocks were determined with a universal testing machine, contact angle tester, X-ray diffractometer , Fourier-transform infrared spectrometer, and scanning electron microscopy. The salt crystallization phenomenon on the block surfaces was also observed to evaluate antiefflorescence performance. Results showed that flue gas desulfurization gypsum blocks containing 0.4 wt% polymethylhydrosiloxane had optimal overall properties. The compressive and flexural strength values were 16.03 and 6.80 MPa, respectively; the water absorption rate was 3.25%; the softening coefficient was 0.83; and the contact angle with water was 121.75°. The introduction of polymethylhydrosiloxane improved water resistance for flue gas desulfurization gypsum blocks, which also discharged water from the blocks and removed soluble salt , effectively prevented efflorescence.
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Chemosensors
·
2022
·Vol. 10
·期 6
·226
·
IF 4.229
Xue Shi,Hua Zhang,Hanyang Ji,Fanli Meng
Volatile organic compounds (VOC) harm human health seriously in the air. Therefore, it is essential to recognize VOC gases qualitatively and quantitatively. The dynamic measurement method can improve the selectivity of metal oxide semiconductor (MOS) gas sensors to VOC, but there is a problem of the insufficient number of characteristic peaks. From the experimental point of view, the primary judgment basis for the correct qualitative and quantitative recognition of VOC gases by the dynamic measurement method is the characteristic peak of the dynamic response signal. However, the traditional dynamic measurement method generally only has two characteristic peaks. In this experiment, the voltage was changed at the time of the second characteristic peak by controlling the constant dynamic response period. Taking ethyl alcohol as an example, the experimental results show that the characteristic peak of the dynamic response signal does not increase when the voltage is constant. However, a new characteristic peak will appear based on a continuously rising heating voltage. The characteristic peaks of the dynamic response of n-propyl alcohol, isopropyl alcohol, and n-butyl alcohol were also increased based on the rising heating voltage waveform. Based on the K-Nearest-Neighbors algorithm, the qualitative and quantitative recognition rate of the four alcohol homologue gases reached 100%.Keywords:dynamic response signal;characteristic peaks;ZnO gas sensor;periodic cycle heating waveform;alcohol homologue gases
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Shuang Li,Yuchi Zhang,Le Han,Xianliang Li,Yan Xu
Heterojunction formation has been considered as an effective way for exploring ultrahigh sensitive multi-metal oxide based gas sensors. Herein, unique hierarchical radial CeO 2 /ZnO heterostructures with excellent triethylamine (TEA) gas-sensing performance were successfully prepared via a feasible solvothermal method . The morphology, microstructure and gas-sensing performance of the composite were systematically characterized and investigated. The selective TEA gas response of the radial CeO 2 /ZnO heterostructure was increased by ten times as compared to that of pure ZnO phase, ascribing to the abundant reactive sites induced by the formation of n-n heterojunction . Furthermore, the radial CeO 2 /ZnO n-n heterojunction exhibited the best TEA gas sensitivity with R a /R g = 92.17 at an operating temperature of 200 °C, a fast response/recovery time of 29 s/23 s, and a long-term stable repeatability for at least 60 days. The excellent selectivity of CeO 2 /ZnO heterojunction for TEA sensing is also remained even when mixing with other interferent gases. The interface-dependent and enhanced TEA sensing property of CeO 2 /ZnO can be ascribed to its intriguing radial morphology, for which the CeO 2 nanoparticles located in the internal structure of the composite while the ZnO hexagonal prism grew radially outward. The well assembled hierarchical CeO 2 /ZnO n-n heterojunction with abundant accessible active sites significantly facilitate the surface reaction and diffusion of target gas molecules at the interface between CeO 2 and ZnO during gas sensing process.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Su Liu,Mingqiang Tang,Jun Pang,Jintao Hu,Weijie Chen,Jie Cheng,Zewei Liu,Haihong Zhao,Rong Tan
Water-soluble single-chain polymeric nanoparticles (SCPNs), which isolated catalytic sites within a hydrophobic interior, made water-incompatible organometallic catalysis highly efficient in water. However, it is still a great challenge to conveniently control their hydrophilicity, so as to combine reactivity and recovery of the catalytic SCPNs in aqueous systems. Herein, we have developed a series of catalytic SCPNs, which possessed CO2-switchable hydrophilic/hydrophobic behavior, to realize the gas-controlled reaction and separation for asymmetric sulfa-Michael addition (SMA) in water. A novel series of CO2-switchable random copolymers were thus synthesized by copolymerization of CO2-responsive amidine derivatives with hydrophobic chiral salen FeIII monomers via reversible addition-fragmentation chain transfer polymerization. Characterization suggested their CO2-controlled self-collapse behavior in water due to CO2-switched change in hydrophilicity/hydrophobicity of the amidine moiety. The resultant CO2-switchable SCPNs provided hydrophobic, catalytic compartments for asymmetric SMA in water upon CO2 addition, giving various chiral β-keto sulfides with almost quantitative yields (90–98%) and high enantioselectivities (93–99%). When CO2 is removed by N2 bubbling, they were collapsed and spontaneously precipitated from the aqueous system for steady reuse. The gas-controlled reaction-separation approach provides an energy-efficient way to combine reactivity and recovery of catalytic SCPNs in aqueous systems, which should be quite practical in large-scale industrial applications.
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