JOURNAL OF SOLID STATE CHEMISTRY
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2020
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IF 2.726
Xiaodong Wang,Yanjun Yin,Mingling Li,Yuan Hu
An ecofriendly flame retardant was synthesized by hydrothermal method . The structure and morphology of h-BN@ZnFe 2 O 4 were characterized. PVA nanocomposites were prepared by adding h-BN@ZnFe 2 O 4 as filler into PVA. The effect of h-BN@ZnFe 2 O 4 on the flame retardant properties of PVA composites was studied and the flame retardant mechanism was also analyzed. The results showed that the peak heat release rate of PVA nanocomposites was slightly lower than that of pure PVA and the amount of CO , CO 2 , and hydrocarbons produced by the pyrolysis of PVA nanocomposites is less than that of pure PVA. The main reasons for this are the physical barrier effect of h-BN and catalytic carbonization effect of zinc ferrate .
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高影响因子
JOURNAL OF CATALYSIS
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2020
·
IF 7.888
Hong Zhang,Shunhang Wei,Xiaoxiang Xu
BaTaO 2 N owns a promising band gap of 1.8 eV and suitable band edge positions but generally exhibits poor photocatalytic activity for water splitting reactions. In this work, we have modified BaTaO 2 N by introducing Mg to the B site of perovskite lattice to form a new compound, i.e. BaTa 0.95 Mg 0.05 O 2+x N 1−y . This modification results in an alteration to a number of important parameters such as unit cell size, nitrogen content, optical absorption and microstructures etc. More importantly, Mg modifications are responsible for stronger Ta-O/N bonds, lower Ta 4+ defects concentration and positively shift of band edge positions, which in turn contribute to high photocatalytic activities for water oxidation reactions. Apparent quantum efficiency as high as 2.59% has been realized at 420 ± 20 nm, being the highest for BaTaO 2 N reported to date under similar conditions. Further photoelectrochemical analysis confirms better charge utilizations in Mg modified BaTaO 2 N.
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JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Xuxia Hao,Jianqiang Bi,Weili Wang,Weikang Yan,Xicheng Gao,Xiaoning Sun,Rui Liu
Bimetallic carbides have aroused wide attention for energy-storage applications recently. In this work, one-dimensional Fe 2 MoC/CNFs (Fe 2 MoC/C nanofibers) are successfully synthesized via a facile electrospinning method for the first time. To obtain the most integrated structure between the Fe 2 MoC nanoparticles and carbon nanofibers , we explore the optimal heating rate during the carbonization treatment. Fe 2 MoC/CNFs exhibits an integrated one-dimensional structure under 800 °C with a heating rate of 5 °C/min. As revealed in the experimental results, Fe 2 MoC/CNFs possesses a high specific surface area of 196.9 m 2 /g, a high specific capacitance of 347.8 F/g at the current density of 1 A/g, an excellent rate capability of 91% capacitance retention from 1 A/g to 40 A/g, and shows superior cycling stability with the capacitance retention of about 85.6% and Coulombic efficiency of about 100% after 5000 cycles. An asymmetric supercapacitor coin-cell device using Fe 2 MoC/CNFs as the positive electrode displays an energy density of 14.5 Wh/kg at a power density of 300 W/kg and an outstanding cycling life of 93% retention after 5000 cycles. The impressive electrochemical performance indicates that the Fe 2 MoC/CNFs composite is a promising material for efficient supercapacitors .
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ACS Applied Energy Materials
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2020
·
IF 4.473
Qinxin Luo,Dan Lin,Wenqi Zhan,Wanqun Zhang,Lulu Tang,Jingjing Luo,Zhan Gao,Peng Jiang,Miao Wang,LuYuan Hao,Kaibin Tang
Currently, the oxygen evolution reaction (OER) plays a key role in the industrial application of renewable electrochemical technologies. Thus, developing electrocatalysts with high performance and sufficient stability for the OER is urgently pursued. Although perovskite oxides have provided numerous degrees of freedom for enhancing the electrocatalytic activity due to their diversity and flexibility, their investigation for the OER is mostly limited to pseudocubic structures. In this study, a complex perovskite oxide, Ba0.9Sr0.1Co0.8Fe0.1Ir0.1O3−δ (BSCFI-91), with a six-layer hexagonal (6H) structure, is synthesized first, displaying higher OER activity. Based on parent Ba0.9Sr0.1Co0.8Fe0.2O3−δ (BSCF-91), BSCFI-91 is obtained by replacing iron (Fe) with low-level iridium (Ir) doping and produces a current density of 10 mA cm–2 at a low overpotential of 300 mV, a small Tafel slope of 61.2 mV dec–1, and good stability up to 10 h in a 1.0 M KOH electrolyte. The dramatically enhanced OER performance is achieved by optimizing cobalt (Co) valence and highly oxidative oxygen species based on the hexagonal structure. The Ir incorporation facilitated the oxygen (O) p band center approaching to the Fermi level, indicating that BSCFI-91 could be a candidate in the electrocatalyst application. Moreover, this study opens up a new way to design efficient perovskite oxides for OER catalysis in terms of hexagonal crystal structures and composition modulation strategy.
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MATERIALS LETTERS
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2020
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IF 3.204
E. Loni,M.H. Siadati,A. Shokuhfar
In the current work, for the first time, hard-templating method was applied to synthesize mesoporous Na 2 CoP 2 O 7 powder for oxygen evolution reaction (OER) application. X-ray diffraction patterns (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and Brunauer–Emmett–Teller (BET) analyses were carried out for investigating the structure, composition, and morphology of the electrocatalyst powder. The electrocatalytic performances of the mesoporous Na 2 CoP 2 O 7 (meso-Na 2 CoP 2 O 7 ) powder along with its composites with reduced graphene oxide (rGO) were studied by linear sweep voltammetry (LSV). The meso-Na 2 CoP 2 O 7 /rGO (50/50 wt%) composite required only 167 mV overpotential to produce a current density of 10 mA cm −2 .
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高影响因子
ACS Applied Materials & Interfaces
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2020
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IF 8.758
Yuanqin Li,Kang Wang,Jiawei Chen,Wenguang Zhang,Xuehuan Luo,Zhangmin Hu,Qiankui Zhang,Lidan Xing,Weishan Li
High-voltage cathodes provide a promising solution to the energy density limitation of currently commercialized lithium-ion batteries, but they are unstable in electrolytes during the charge/discharge process. To address this issue, we propose a novel electrolyte additive, pentafluorophenyltriethoxysilane (TPS), which is rich in elemental F and contains elemental Si. The effectiveness of TPS has been demonstrated by cycling a representative high-voltage cathode, LiNi0.5Mn1.5O4 (LNMO), in 1.0 M LiPF6–diethyl carbonate/ethylene carbonate/ethyl methyl carbonate (2/3/5 in weight). LNMO presents an increased capacity retention from 28 to 85% after 400 cycles at 1 C by applying 1 wt % TPS. Further electrochemical measurements combined with spectroscopic characterization and theoretical calculations indicate that TPS can not only construct a robust protective cathode electrolyte interphase via its oxidation during initial lithium desertion but also scavenge the detrimental hydrogen fluoride (HF) present in the electrolyte via its strong combination with the species HF, F–, and H+, highly stabilizing LNMO during the charge/discharge process. These features of TPS provide a new solution to the obstacle in the practical application of high-voltage cathodes not limited to LNMO.
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PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2020
·Vol. 167
·期 6
·067517
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IF 3.721
Lijun Zhang,Qianwen Li,Zhongbo Li,Zhaofang Du,Xia Hong,Longzhen Qiu
The chiral recognition of α-amino acids has attracted considerable interest because different enantiomeric amino acids show differences in their biological behavior and pharmacological activity. An organic electrochemical transistor (OECT)-based biosensor modified with L-amino acid oxidases (L-AAODX) was fabricated and successfully used as a biosensor for enantioselectively discriminating α-amino acids, such as D/L-tryptophan (D/L-Trp), D/L-tyrosine (D/L-Tyr) and D/L-phenylalanine (L-Phe) with high performance because L-AAODX selectively catalyzed the oxidation of L-Trp, L-Tyr, and L-Phe along with the amplification of OECT. The biosensor showed a sensitivity of 19.67 μA/μM with a LOD of 10 nM (S/N > 3) over the range of 10 nM to 30 μM for L-Trp, 16.71 μA/μM with a LOD of 2 nM (S/N >3) over the range of 2 nM to 30 μM for L-Tyr and 15.51 μA/μM with a LOD of 10 nM (S/N > 3) over the range of 30 nM to 30 μM for L-Phe. Furthermore, the biosensor can both be used for the chiral recognition of Trp, Tyr and Phe, and distinguish L-amino acids from its interferences (e.g., Glu, UA, L-Asp, L-Lys and L-Glu) and common metal ions (K+, Na+ and Fe3+).
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高影响因子
International Journal of Polymer Science
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2020
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IF 1.646
Shuxi Gao,Xiaoyong Hu,Lei Zhang,Yuliang Mai,Hao Pang,Yongqiang Dai,Bing Liao
One silsesquioxane-polythiophene hybrid copolymer, with combined star-like structure and intramolecular heterogeneity, was synthesized and sufficiently characterized via various methods, including FTIR, NMR, and SEC measurements. According to the exploration and characterization results, it was much more efficient at modifying SWNTs than its linear analogs in aqueous solution. The hydrophobic silsesquioxane core and PEDOT chains could locally anchor to the surface of the nanotubes, while the soluble flexible copolymer chains extended into the solution and rigid conjugated chains provided some - stacking effect to enhance adhesive force with the conjugated structure of the carbon nanotube, imparting steric stabilization to nanotube dispersion. The noncovalent interaction with SWNTs and solubility in aqueous solution improved the electrochemical characteristics of the modified-SWNT composite and availed for the preparation of a flexible and transparent electroactive film. Accordingly, this kind of silsesquioxane-polythiophene hybrid copolymer will be forwarded to apply to the assembling of flexible optoelectronic devices.
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ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Lijun Gao,Qiang Dong,Silin Bai,Sucen Liang,Chao Hu,Jieshan Qiu
Capacitive deionization (CDI) has shown great promise in desalinating salt water; however, conventional CDI electrode materials suffer from low specific salt capacity and charge efficiency owing to the co-ion expulsion effect. Herein, using expanded MoS2 nanosheets supported by reduced graphene oxide (MoS2/rGO) as the intercalation electrode, we develop a hybrid CDI system that shows a battery-like behavior and can reversibly store cations through the intercalation mechanism. The incorporation of rGO in the composite not only affords a conductive support and ensures fast electron transfer but also, more importantly, widens the MoS2 interlayer spacing from 0.62 to 0.73 nm. The expanded MoS2 interlayer facilitates the diffusion of cations and decreases the internal strain during the intercalation/de-intercalation process. Also, it endows MoS2/rGO with more accessible sites and space for cations in the electrolyte. Benefiting from the desirable structure features, the hybrid CDI system delivers a remarkable specific salt capacity of 34.20 mg g–1 and a charge efficiency as high as 97% in 300 mg L–1 sodium chloride aqueous solution. The MoS2/rGO involved in the CDI system for the adsorption of other metal ions is also verified, indicating its potential applications for the removal of various metal ions in brackish water and seawater.
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Methods and Applications in Fluorescence
·
2020
·Vol. 8
·期 2
·025005
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IF 2.8
Zhikun Gao,Yu Luan,Yunfei Cao,Jialin Li,Yi Lu,Tianshu Liu,Ningwei Wang,Zhiping Zhou,Weihong Huang,Wanzhen Xu
An eco-friendly fluorescence polymer nanoparticle based on carbon quantum dots and poly(methyl methacrylate) nanoparticles is successfully fabricated to detect sulfadiazine. By making use of the abundant functional group of carbon quantum dots and poly(methyl methacrylate) nanoparticles, without any extra modification, the synthetic process of the fluorescence nanoparticles is reduced and the unnecessary chemical molecules are avoided being brought into the reaction system. The investigation of the fluorescence property of carbon quantum dots shows that the prepared carbon quantum dots are the excitation independent. In addition, the morphology of the synthesized fluorescence polymer nanoparticle is tested by the scanning electron microscope and shows that the fluorescence sensor possesses a good spherical core–shell structure. Moreover, under the optimized condition, the prepared fluorescence polymer nanoparticle possesses a good selectivity in the detection of sulfadiazine under a mixture solution. Moreover, the limit of detection is 4 μmol.l−1 within the detective range from 10 μmol.l−1 to 60 μmol.l−1. Meanwhile, the fluorescence quenching mechanism is considered with the photoinduced electron transfer mechanism. Finally, the practical research on the detection of sulfadiazine in tap water shows that the recovery range and relative standard deviation are 97.5% − 105.1% and 2.1%–4.5%, respectively.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Qingbo Wei,Zhangwen Ye,Xianpei Ren,Xue Li,Mingli Yin,Lingxing Zan,Feng Fu
Structure and morphology play a crucial role in improving the performance of catalysts. In this work, we prepared core-shell structured CoS 2 @MoS 2 nanoparticles by a two-step hydrothermal method . The unique electrochemical properties of the core-shell CoS 2 @MoS 2 nanoparticles with a narrow size distribution centered at 20–30 nm were demonstrated. An excitation-dependent photoluminescence emission was observed for the core-shell CoS 2 @MoS 2 nanoparticles. These core-shell CoS 2 @MoS 2 nanoparticles showed an excellent catalytic activity towards hydrogen evolution reaction (HER), indicated by the onset potential of 190 mV ( vs. RHE), the overpotential of 276 mV at a current density of 10 mA cm −2 and the Tafel slope of 60 mV·dec −1 . Therefore, the developed core-shell CoS 2 @MoS 2 nanoparticles can be applied for HER for their excellent catalytic activities.
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ACS Applied Electronic Materials
·
2021
·
IF 3.314
Jingyu Li,Changshuai Dong,Junli Hu,Jun Liu,Yichun Liu
The intrinsic flexibility makes conjugated polymers an ideal choice for wearable thermoelectrics. The n-type polymer thermoelectric is still in its infancy. The majority of research on the n-type polymer thermoelectric focuses on the design of n-type conjugated polymers and high-efficiency n-dopants. In this paper, we report a self-standing and flexible nanofiber mat of an n-type conjugate polymer prepared with electrospinning technology. We choose a representative n-type conjugate polymer N2200. The electrospun N2200 nanofiber mat shows a maximal conductivity of 7.06 × 10–4 S/cm, a maximal Seebeck coefficient of −346 μV/K, and a maximal power factor of 0.0085 μW/(m K2). This thermoelectric performance is fairly comparable to that of the traditional spin-coated N2200 thin film. The nanofiber mat is self-standing, flexible, and stretchable and thus can attach to human skin and move with body movement. This work demonstrates the feasibility of fabricating flexible thermoelectric devices by an electrospinning technique and lays a foundation for the applications of n-type conjugated polymers in wearable electronics.
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危险品化学品经营许可证（带存储）