PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2016
·Vol. 33
·期 8
·569-575
·
IF 4.367
Yuqi Xu,Yongchao Hao,Guoxin Zhang,Xiuyan Jin,Lin Wang,Zhiyi Lu,Xiaoming Sun
Herein, a strategy for one-step fabrication of cobalt sulfide/graphene (Co 1− x S/G) nanocomposite as bifunctional catalyst for oxygen catalysis is demonstrated. The one-step fabrication method involves annealing the mixture of cobalt salt, thioacetamide, and graphene oxide with the assistance of small amount of glycol without any further purification steps. The Co 1− x S/G shows a morphology with small-sized Co 1− x S nanocrystals strongly and uniformly anchored on the graphene surface. Systematically electrochemical studies demonstrate that the Co 1− x S/G with optimized components shows superior catalytic activities toward oxygen reduction and oxygen evolution, which are comparable or even superior to commercial Pt/C and Ir/C catalysts. As a result, the potential hysteresis of Co 1− x S/G is the lowest among all the samples. The facile operability of the fabrication method and the high bifunctional activity of Co 1− x S/G may pave one practical way for broad applications including fuel cell, metal-O 2 battery, and water electrolysis.
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高影响因子
Solar RRL
·
2020
·Vol. 4
·期 9
·2000220
·
IF 7.527
Kanghua Li,Yue Lu,Xiaoxing Ke,Sen Li,Shuaicheng Lu,Chong Wang,Siyu Wang,Chao Chen,Jiang Tang
Antimony chalcogenides (including Sb 2 S 3 , Sb 2 Se 3 , and Sb 2 (S,Se) 3 alloy) have emerged as promising solar absorber materials. Notably, the Sb 2 (S,Se) 3 alloy possesses continuously tunable bandgap from 1.1 to 1.7 eV, which covers the ideal bandgap for single-junction photovoltaics governed by the Shockley–Queisser theory. Moreover, the bandgap gradient provides effective ways for photogenerated carriers collection and has the potential for high-efficient Sb 2 (S,Se) 3 alloy solar cells. Herein, a V-shaped distributional bandgap in Sb 2 (S,Se) 3 solar cells is reported through a simple dual-source vapor transport deposition process, enabling the synergetic increase of the open-circuit voltage ( V OC ) and short-circuit current ( J SC ). Through careful optimization, a power conversion efficiency of 7.27% under AM1.5G illumination is obtained, with V OC and J SC of 0.46 V and 29.6 mA cm −2 , respectively. This V-shaped bandgap engineering provides an effective method to enhance the device performance and can be extended to other chalcogenide thin-film solar cells such as Sn–X, Ge–X, Cu–Sb–X (X = S and Se), and so on.
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POLYMER DEGRADATION AND STABILITY
·
2013
·
IF 2.77
Yongzhen Wang,Jianqing Zhao,Yanchao Yuan,Shumei Liu,Zhengming Feng,Ying Zhao
In this study, a maleimido-substituted aromatic s-triazine (TMT) was synthesized successfully via the nucleophilic substitution reaction between cyanuric chloride and N-(4-hydroxyphenyl) maleimide (HPM) formed from paraaminophenol and maleic anhydride ; and its structure was characterized by flourier transform infrared spectroscope (FT-IR), 1 H and 13 C nuclear magnetic resonance (NMR), and elemental analysis (EA). The studied flame-retarded epoxy resins were obtained via thermal curing reactions among 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) modified epoxy prepolymer (DOPOER), 4,4′-diaminodiphenyl ethane (DDM) and TMT. Cure kinetics, flame-retardant, thermal and mechanical properties of the cured epoxy resins were characterized by differential scanning calorimeter (DSC), thermogravimeric analysis (TGA), limited oxygen index (LOI) measurement, UL 94 vertical burning test and mechanical test. The results indicate that TMT can promote the curing reaction of epoxy resins and decrease its apparent activation energy ( E a ). Introduction of TMT can greatly improve flame-retardant, thermal and mechanical properties of the cured epoxy resins. Compared with the DOPOER/DDM system without TMT, LOI value of the cured epoxy resin can increase from 36.4% to 51.8%, and all samples can pass UL 94 V-0 rate when TMT content ranges from 1.98 wt% to 7.44 wt%. Its initial degradation temperature and glass transition temperature ( T g ) can increase maximally by 37.6 °C and 12.6 °C, respectively when TMT content is 3.88 wt%.
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SOLID STATE SCIENCES
·
2016
·
IF 2.041
Long Shi,Dajiang Mei,Jingli Xu,Yuandong Wu
Three new bismuth-based compounds, Bi 2 O(XO 4 )(IO 3 ) 2 (X = S, Se, Cr) have been synthesized by hydrothermal method and characterized by single-crystal X-ray diffraction. Title compounds crystallize in the monoclinic space group P 2 1 /n (No.14) with lattice parameters: a = 7.2391(5), b = 17.9074(12), c = 7.7964(5) Å, β = 109.6521(15) °, Z = 4 for Bi 2 O(SO 4 )(IO 3 ) 2 ; a = 7.2665(4), b = 18.0115(10), c = 7.9310(5) Å, β = 109.7480(10) °, Z = 4 for Bi 2 O(SeO 4 )(IO 3 ) 2 ; and a = 7.2708(6), b = 17.9967(14), c = 7.8998(6) Å, β = 109.799(2) °, Z = 4 for Bi 2 O(CrO 4 )(IO 3 ) 2 , respectively. All compounds exhibit three-dimensional frameworks that are composed of [Bi 4 O 2 ] 8+ clusters, [IO 3 ] − and [XO 4 ] 2− (X = S, Se, Cr) groups. Bi atoms occur in two different coordination types, showing the stereochemical influence of the Bi 3+ lone electron pair. Title compounds were characterized by infrared spectra, solid state UV–vis–NIR diffuse reflectance spectroscopy and thermogravimetric analysis.
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Journal of Energy Chemistry
·
2021
·
IF 9.676
Huanhuan Yuan,Cheng Guo,Jiahang Chen,Huichao Lu,Jun Yang,Yanna Nuli,Jiulin Wang
High-energy density lithium-sulfur (Li-S) batteries have received intensive attention as promising energy storage system. Among diverse sulfur-based cathodes, sulfurized pyrolyzed poly(acrylonitrile) (S@pPAN) cathode delivered superior electrochemical performance. However, the sulfur content of S@pPAN is relatively low (<50 wt%), which significantly limits the energy density. Herein, a hydrogel SA-Cu binder was proposed with a crosslinking network constructed by Cu 2+ ions. The introduction of Cu 2+ ions enabled excellent electrochemical behaviors of S@pPAN cathode even with high sulfur content of 52.6 wt% via chemical interaction with sulfur and polysulfide. Moreover, a favorable cathode interphase was formed containing electrochemically active and conductive CuS x . S@pPAN/SA-Cu exhibited a high sulfur utilization of 85.3%, long cycling stability over 1000 cycles and remarkable capacity of 1200 mAh g s −1 even at 10 C. Furthermore, ascribed to the improved electrode structure, high-loading electrode (sulfur loading: 4 mg cm −2 ) displayed stable cycling with areal capacity of 5.26 mAh cm −2 (1315 mAh g s −1 ) after 40 cycles. This study provides new directions to prepare high-sulfur content and high-loading S@pPAN cathode for higher energy density.
研究领域:
储能与转换
·
电化学
·
材料科学
·
高分子科学
·
电池技术
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高影响因子
IONICS
·
2022
·Vol. 28
·期 7
·3217-3222
·
IF 2.961
Du Gang,Zhao Jinguo,Yang Hongwei
Lithium-sulfur batteries with high theoretical energy density have drawn much attention during the past decades, while the shuttle effect of the polysulfide also hinders the practical application. The employment of suitable host materials has been considered as the effective strategy to inhibit the polysulfide migration. In this work, we develop MoO 2 /C composite as sulfur host material to increase the capacity of lithium-sulfur batteries while retaining high capacity after cycles. The MoO 2 /C composite could serves as active sites, effectively adsorbing and catalytically converting polysulfide, thus improving the redox kinetics and reducing shuttle effect. Owing to these merits, the as-prepared MoO 2 /C@S cathodes exhibit high capacity of 1165 mAh g −1 at 0.1 C. Meanwhile, the battery exhibits superior rate capability and stable cycling performance.
研究领域:
储能
·
材料科学
·
电化学
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Journal of Physical Chemistry C
·
2024
·
IF 3.3
Yi Pan,Yongzhao Feng,Shiyu Wang,Xiaofang Lai,Hong Zhang,Jikang Jian
P-type AgSbTe2 exhibits great potential due to its high thermoelectric (TE) performance in the medium-temperature range. It is of importance from both scientific and application perspectives to enhance the TE performance of AgSbTe2 by substituting the environmentally harmful and expensive Te with the eco-friendly and cost-effective element S. In this work, we report an enhanced maximum figure of merit zT value of 1.31 at 573 K and an average zT value of 0.87 in the temperature range of 300–623 K for S-doped AgSbTe2, which are increases of about 23% and 30% than those of the undoped sample through the synergistic optimization of the electrical and thermal transport properties. S dopant suppresses the formation of Ag2Te precipitates at the grain boundaries, increases the p-type carrier concentration, and enlarges effective mass, which promotes the power factor. Meanwhile, the thermal conductivities of AgSbTe2–xSx samples decrease due to enhanced phonon scattering caused by S doping. This work demonstrates that the eco-friendly and low-cost substitution for Te with S is promising to advance the applications of AgSbTe2-based TE materials.
研究领域:
材料科学
·
热电学
·
能量转换
·
固体物理
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高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2014
·Vol. 42
·期 8
·1131-1135
·
IF 0.7
Hui-Zhi LI,Tao ZHAI,Guang-You ZHANG,Mei-Shan PEI
A novel fluorescence switch was constructed based on poly 3-{[1-(2-hydrazino-2-oxoethyl) piperidin-4-ylidene]methyl} thiophene (PMTH) in the presence of Pb 2+ and S -adenosylmethionine (SAM). The fluorescence of PMTH solution can be efficiently quenched by Pb 2+ ions, resulting in a “fluorescence off” state. Upon the addition of SAM, a strong Pb 2+ chelator, to Pb 2+ -PMTH solution, fluorescence of PMTH can be restored, leading to fluorescence “on”. Based on this fluorescence switch characteristics of PMTH, a new method for recognition and determination of SAM was established. By investigating the fluorescence spectral characteristics of Pb 2+ -PMTH and Pb 2+ -SAM complexes in H 2 O/CH 3 CH 2 OH (4:1, V/V ) solution, we found this method offered advanced sensitivity and selectivity for detecting SAM in the presence of common amino acids and metal ions. Under optimum conditions, the relative fluorescence intensity exhibited a linear relationship with SAM concentration in the range of 1.0 × −8 –2.0 × 10 −6 M. The regression equation was Δ 68.51 + 72.32 C (μith a correlation coefficient r = 0.9982. The limit of detection was 8.72 × 10 −9 M. The method was successfully applied in the detection of SAM in real samples.
研究领域:
分析化学
·
高分子科学
·
荧光传感
·
生物分析化学
·
环境监测
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高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.7
Yuqi Xie,Enze Zhu,Yimeng He,Yifan Wang,Qinghua Li,Bingxin Lei
Lead-free double perovskite Cs2AgBiBr6 (CABB) has emerged as a promising photocatalytic material, but its efficiency is limited by rapid electron–hole recombination and insufficient active sites. Herein, an S-scheme heterojunction photocatalyst was constructed through the in situ growth of CABB nanosheets on a zinc phthalocyanine (ZnPc) substrate, where ZnPc acted as the reduction site with abundant high-energy electrons. Comprehensive characterizations confirmed the formation of robust interfacial Zn–Br bonds, ensuring intimate contact between ZnPc and CABB. Under visible-light irradiation, the optimized 0.05ZnPc/CABB composite exhibited significantly enhanced photocatalytic activity, achieving complete degradation of Rhodamine B (RhB) within 20 min, which outperformed pristine CABB and ZnPc. Mechanistic investigations involving photoelectrochemical measurements and density functional theory calculations revealed that the S-scheme band alignment, driven by the interfacial Zn–Br bonds and the built-in electric field, significantly enhanced charge separation and transfer. Additionally, the composite displayed excellent stability, maintaining 99% RhB degradation efficiency after five cycles. This work provides a novel strategy to enhance CABB photocatalysis via constructing S-scheme heterojunctions with ZnPc, highlighting potential applications in environmental remediation.
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产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2026
·Vol. 19
·期 5
·e202501878
·
IF 5.9
Jun Li,Ronghao Liu,Hao Tian,Yanzhao Yang
Precious metal recovery from secondary resources with high efficiency and minimal environmental impact remains a critical challenge in separation technology. In this study, a novel ionic liquid N6-tetramethyl-N1-(4-vinylbenzyl)hexane-1,6-diammonium chloride (TVBHDCCl 2 ) was synthesized and subsequently polymerized into bicentric poly(ionic liquid)s, designated as P(TVBHDCCl 2 )s. The P(TVBHDCCl 2 )s demonstrated exceptional adsorption capacities for gold (637 mg/g), palladium (299 mg/g) and platinum (542 mg/g) with fast adsorption kinetics to reach equilibrium within 2–4 min and appreciable stability in acidic medium (pH = 1). Combined experimental and theoretical analyses revealed that the adsorption process is governed by a synergistic mechanism involving electrostatic interactions and redox reactions, with the primary adsorption site located in the region between the double cationic center in P(TVBHDCCl 2 )s. In summary, this work introduces a highly efficient, selective, and sustainable polymeric adsorbent for simultaneously recovering precious metals from secondary resources, presenting a viable strategy for resource recycling and green separation technology. Graphical A green and efficient strategy is reported for the selective adsorption of Au(III) from wastewater containing As 3+ , Ag + , Ni 2+ , Pb 2+ , Pd 2+ , and Pt 4+ . By using poly(ionic liquid)s (PILs) as adsorbents, gold is preferentially captured. Following adsorption, efficient stripping and washing enable complete regeneration of the PILs. This closed-loop cycle offers a sustainable pathway for precious metal reclamation.
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高影响因子
LANGMUIR
·
2026
·
IF 4.4
Tie Ye,Yong Qin,Zhenyu Gao,Zhengkun Long
Advancing green hydrogen evolution critically depends on the design of bifunctional electrocatalysts that are both highly economical and efficient for overall water decomposition. Herein, we report the sulfur-doped porous CoMoP2 catalyst synthesized on nickel foam (S-CoMoP/NF) via a simple step-by-step hydrothermal approach. Through extensive physicochemical characterization, it is verified that S atoms are effectively immobilized into the CoMoP2 lattice, thereby tuning the electronic structure while retaining a porous framework. As evidenced by electrochemical testing conducted in 1.0 M KOH, S-CoMoP/NF possesses exceptional bifunctional capability, attaining overpotentials as low as 191 mV for the hydrogen evolution reaction and 331 mV for the oxygen evolution reaction at a current density of 100 mA cm–2. According to density functional theory (DFT) calculations, the introduction of S dopants triggers charge redistribution, elevates the d-band center, and fine-tunes the adsorption, consequently accelerating the catalytic kinetics. The S-CoMoP/NF||S-CoMoP/NF electrolyzer achieves 100 mA cm–2 at 1.82 V and demonstrates a stabilized performance throughout 80 h. Beyond presenting a high-performance non-noble bifunctional electrocatalyst, this work further elucidates how anionic doping modulates charge distribution to enable efficient water splitting.
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DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2026
·Vol. 156
·期 6
·156
·
IF 2.5
Tao Kun,Zhao Chao,Yu Wenya,Hu Shengye,Xue Hui,Zhang Mengmeng M.
Converting CO 2 into valuable chemicals is a sustainable way to address the energy and environmental crisis, yet achieving high selectivity toward CO remains challenging. Here, a S-doped copper-bismuth oxide (S-CuBiO x ) catalyst with a hierarchical structure was synthesized via a facile solution method toward selectively producing CO from CO 2 . The prepared S-CuBiO x exhibits a 91.3% CO Faradic efficiency at −0.9 V RHE in an H-type cell with 0.5 M KHCO 3 solution, delivering a 3.8-fold enhancement compared to the undoped CuBiO x , while decreasing the H 2 and HCOOH by-products to 2.6% and 4.5%, respectively. The doped-S can be responsible for the excellent CO selectivity, namely, the S dopant induces S-M-O (M = Cu or Bi) bond formation and tunes the local electronic structure of S-CuBiO x , thus benefiting *COOH formation/stabilization and accelerating the reaction kinetics toward CO. This work provides a rational design strategy for steering CO 2 RR selectivity toward CO via non-metal heteroatom doping in bimetallic oxide systems. Graphical The alternative text for this image may have been generated using AI.
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