SOLID STATE SCIENCES
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2021
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IF 3.059
Lin Liu,Moying Li,Peng Jiang,Kunyang Cui,Yuqian Wang,Jianlei Kuang,Wenbin Cao
The solid solution of YIn 1- x Mn x O 3 shows intense blue colors as well as excellent properties. In this paper, N- and N/S- doped YIn 1- x Mn x O 3 samples are successfully prepared by the high-energy ball milling method with hexamethylenetetramine (C 6 H 12 N 4 ), urea (CH 4 N 2 O) and thiourea (CH 4 N 2 S). The X-ray diffraction patterns of samples with various anion doping all show single phase and the oxidation state of Mn are maintained as +3. In C 6 H 12 N 4 treated YIn 0.7 Mn 0.3 O 3 , N is in the interstitial site while in CH 4 N 2 O treated YIn 0.7 Mn 0.3 O 3 , N exists in both interstitial site and substitution site. In CH 4 N 2 S treated YIn 0.7 Mn 0.3 O 3 , both S and N are in the substitution site and interstitial site. Due to the anion doping by N and S, the optical properties of the samples are modified and analyzed.
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高影响因子
Journal of Energy Storage
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2021
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IF 6.583
Jie Xu,Cuili Xiang,Songwen Fang,Luping Zhu,Fen Xu,Lixian Sun,Yongjin Zou,Jian Zhang
Supercapacitors, such as pseudocapacitors (PCs), are widely used because of their excellent electrochemical activity and capacitance; however, it is still challenging to fabricate PCs with high stability and good electrochemical properties. Therefore, suitable templates and transition metal composite materials should be selected for improving their performance. Binary transition metal sulfides exhibit excellent electrochemical performance owing to their rich valence, electrical conductivity, and abundant electrochemical active sites. In this study, we prepared porous Mn-Co-S nanospheres (MCSN) via the hydrothermal method using silica colloidal particles was as the template; to the best of our knowledge, this is the first study to synthesize MCSN. Results suggest that the MCSN composite exhibited excellent conductivity and enhanced stability owing to the porous structure formed by the vertical growth of MnS 2 -CoS 2 nanosheets on silica nanoparticles. The porous MCSN electrode showed an excellent specific capacitance of 1158 F g −1 at 1 A g −1 . Moreover, when coupled with an activated carbon (AC) positive electrode, the supercapacitor of MCSN//AC exhibited stability of 90.4% after 5000 cycles at 10 A g −1 (the specific energy of 34 W h kg −1 at 775 W kg −1 ). Given the results, we believe that the prepared MCSN material has potential application prospects for high-efficiency supercapacitors.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Xue Li,Shubo Wang,Hong Zhang,Cheng Lin,Xiaofeng Xie,Chenxing Hu,Ran Tian
Copoly (arylene ether sulfone)s was employed for proton exchange membrane preparation via atom transfer radical polymerization followed by mild sulfonation , enhanced phase-separated morphology and favorable proton conductivity were achieved. The comprehensive ex-situ properties of a range of membranes with different ion exchange capacities were characterized alongside the fuel cell performances investigation. The membranes exhibit higher water uptake, which is beneficial to the proton conduction, compared to Nafion® 211 while maintaining similar swelling ratio. The prepared membranes exhibit reasonably high proton conductivity (0.16 S/cm at 85 °C) benefitting from the well-defined microstructure and high connectivity of the hydrophilic domains. Considering the comprehensive property, membrane with moderate ion exchange capacity (1.39 mmol/g) was employed to fabricate the membrane electrode assembly and peak power density of 0.65 W/cm 2 at 80 °C, 60% relative humidity was achieved for a H 2 /O 2 fuel cell, these hydrocarbon membranes can therefore be implemented in PEMFCs.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
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IF 8.067
Bo Yu,Fei Ma,Dongjiang Chen,Katam Srinivas,Xiaojuan Zhang,Xinqiang Wang,Bin Wang,Wanli Zhang,Zegao Wang,Weidong He,Yuanfu Chen
The shuttle effect of lithium polysulfides (LiPSs) and sluggish redox conversion significantly hinder practical implementation of lithium-sulfur batteries (LSBs). To overcome these issues, herein, we present MoP quantum dots anchored N, P-doped graphene (MPQ@G) as a multifunctional LSB cathode. The N, P-doped graphene layers serve as a conductive skeleton to support the MoP QDs which can accelerate the electron transfer, physically hinder the polysulfide migration and thus enhance the electrochemical performance. More importantly, as a polar and conductive catalyst, MoP QDs provide catalytically active sites for the conversion of LiPSs. As a result, the LSBs with MPQ@G/S cathodes deliver an elevated initial capacity of 1220.2 mAh g −1 at 0.2 C and remain 98.9% after rate cycles, signifying its exceptional cycling stability. Moreover, it displays a large capacity of 681.2 mAh g −1 even at a high rate of 1 C. The Li-S pouch cell also presents high specific capacities and preeminent cycling stabilities, confirming its great potential for high-rate applications. Density functional theory calculations demonstrate the improved absorptivity and redox conversion reversibility of LiPSs. This work provides an efficient strategy to improve composite with highly adsorptive and catalytic properties for high-performance Li-S batteries.
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高影响因子
MACROMOLECULES
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2021
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IF 5.985
Xiaoliang Yu,Zhengyi Xia,Tengda Zhao,Xiaoyan Yuan,Lixia Ren
Organic magnets are promising in quantum computers, spintronic devices, and information storages for their excellent processing and smart design abilities, resulting from the organic part. However, the organic part shields the magnetic centers to weaken the magnetic interaction. In this work, π–π stacking planar pyrene groups are introduced into cations of a magnetic ionic liquid (NBPBI[FeCl4]) and poly(ionic liquid) (PNBPBI[FeCl4]) with FeCl4– as the anions. By introducing pyrene groups, the shortest distance between neighboring magnetic units is within 4 Å. The ferromagnetic interactions in NBPBI[FeCl4] and PNBPBI[FeCl4] are enhanced by the π–π stacking pyrene groups. Moreover, the corresponding organic magnets are soft ferromagnets, as phase transition from paramagnetism to ferromagnetism is observed from zero field cooling and field cooling tests at the low temperature. This is a new strategy for designing a ferromagnetic organic magnet.
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高影响因子
APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Jianfei Xiao,Yuan Wang,Tian C. Zhang,Shaojun Yuan
Nitrogen-sulfur codoped porous carbon (NSPC) is a promising advanced material, showing great application potential in greenhouse gas capture and energy storage. Here, a novel NSPC with controllable porous structure was fabricated via pyrolysis and activation of N, -containing polycondensates, which were synthesized by one-pot polycondensation reaction of triglycidyl isocyanurate, glucose and thiourea. The obtained sample NSPC-1-650 showed cross-linked spherical morphology with uniform pore size (2.61 nm), large specific surface areas (1927.46 m 2 ·g −1 ), and the doping of nitrogen (4 wt%) and sulfur (2 wt%), which leaded to a good CO 2 adsorption capability (5.56 mmol·g −1 at 298.15 K, 5 bar) and excellent stability. Additionally, when used as a supercapacitor, the NSPC-1-650 sample showed an ultrahigh specific capacitance (224.3F·g −1 at 1 A·g −1 in 6 M KOH electrolyte), an excellent rate capability, and good stability (retained > 85% capacity after 5000 cycles). Notably, the all solid-state symmetrical NSPC-1-650-based supercapacitors delivered a high energy density (the maximal value = 7.8 Wh·Kg −1 ) and power density (the maximal value = 4500 W·Kg −1 ). These results suggest that NSPC-1-650 be a competitive candidate as a CO 2 adsorbent and supercapacitor.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 45
·期 4
·6227-6238
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IF 3.741
Xiangxiang Du,Xuejun Shi,Yanling Li,Kesheng Cao
Summary Herein, N, S-co-doped graphene hydrogel (N/SGH) was first prepared by one-pot feasible hydrothermal approach using thiourea as a dopant for both N and S sources. And then, polyaniline (PANI) was grown on the surface of N, S-co-doped graphene hydrogel via simple adsorption of aniline monomer and in situ polymerization process. The N, S-co-doped graphene/polyaniline (N/SGH/PANI) composite hydrogel was fabricated as a free-standing and binder-free electrode material. Due to the co-doped synergistic effect, the N/SGH electrode exhibited enhanced electrochemical performances. The N/SGH electrode displays a specific capacitance of 130.4 F/g at 0.5 A/g. Compared with pure graphene hydrogel (GH), the specific capacitance of N/SGH and N-doped graphene (NGH) electrodes at 0.5 A/g increased by 53% and 20%, respectively. PANI pseudocapacitor material was introduced to further improve its capacitive performance. The resultant N/SGH/PANI composite electrode could achieve a max specific capacitance of 236.5 F/g at 0.5 A/g. In addition, N/SGH/PANI composite electrode showed stable cycle performance with the capacity retention of 95.1% after 1000 cycles performed at 10 A/g. Those provide a fabrication strategy for the design of high-performance supercapacitors electrode materials.
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高影响因子
TETRAHEDRON LETTERS
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2020
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IF 2.275
Youming Huang,Hongyi Chen,Wenting Zheng,Qingle Zeng
A new protocol for the synthesis of (enantioenriched) benzylic sulfones via the Cu 2 O-catalyzed C–S bond cross coupling of alkane-/arene-sulfinates and (enantioenriched) benzylic quaternary ammonium salts has been developed. The product benzylic sulfones were obtained in good to high yields (75–96%). Chiral arylmethyl sulfones with high enantiomeric excess (90–94% ee) were also synthesized in the presence of Cu 2 O and 1,1′-bis-(diphenylphosphino)ferrocene (dppf).
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Yuzhen Hou,Yanbiao Ren,Shichao Zhang,Kunpeng Wang,Fangshuo Yu,Tao Zhu
Practical application of the lithium-sulfur (Li–S) batteries is still hindered by their capacity decays caused by the shuttling of polysulfides . In this work, 3D MoS 2 nanoporous spheres (MoS 2 -NPSs), exposing abundant active edges by decorating on conductive reduced graphene oxide aerogels (rGOA/GA), were fabricated as an S host to construct the S@MoS 2 @GA cathodes. An S@MoS 2 @GA-0.425 cathode constructed as such delivered an initial capacity of 688 mAh g −1 and arrived at a high discharge capacity of 565 mAh g −1 after 200 cycles at 0.2C; moreover, a reversible capacity of 324 mAh g −1 retained for the electrode after 500 cycles at 1.0C with a slow capacity fading rate of 0.054% per cycle. The improved electrochemical performance can be attributed to the strong interactions of 3D MoS 2 @GA with lithium polysulfides intermediates (Li 2 S n where 4 ≤ n ≤ 8), and the fast lithium ion and electron transport channels formed in the cathode for the sulfur redox reaction . More importantly, the MoS 2 -NPSs electrocatalyst could chemically adsorb the Li 2 S n to fix soluble ones near the conductive GA surface and also could kinetically accelerate the transformation of Li 2 S n .
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Journal of Materials Chemistry C
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2020
·Vol. 8
·期 42
·14723-14731
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IF 7.059
Lele Li,Liwei Yang,Si Zhang,Yuping Sun,Fen Li,Tengteng Qin,Xiaoqiang Liu,Yanmei Zhou,Subbiah Alwarappan
Herein, we designed a NiCo2S4@N/S–CeO2 composite with amplified electrocatalytic oxygen reduction (OR) capability by the in situ growth of NiCo2S4 nanoparticles on CeO2 nanospheres with simultaneous doping of nitrogen and sulfur. After optical characterization of the composite, it was then employed as the signal amplification label for constructing an electrochemical aptasensor. The composite provides a biocompatible and large surface platform to load biomolecules and retain their bioactivity. More importantly, the composite shows a comparable electrocatalytic OR capability similar to a commercial Pt/C catalyst and far better than CeO2, attributed to the NiCo2S4 deposition and oxygen vacancies introduced by N and S doping. Furthermore, the Koutecky–Levich plots indicate a nearly four-electron transfer pathway of the ORR. The as-prepared aptasensor exhibited a highly sensitive and selective determination of a model analyte-sulfadimethoxine with a wide linear range of 0.05–180 nM, a low detection limit of 0.02 ± 0.0011 nM and good feasibility for real-sample detection. This work paved an effective way for the design of highly efficient electrocatalysts with bright prospects in bioanalytical applications.
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ENVIRONMENTAL POLLUTION
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2020
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IF 6.793
Yue-Hong Pang,Yu-Ying Huang,Li Wang,Xiao-Fang Shen,Yi-Ying Wang
Bisphenol A (BPA) is a widely produced chemical that is mainly used as raw material for manufacturing plastic products. It is an endocrine disruptor and causes irreversible damage to the human body. Bisphenol S (BPS), an alternative to BPA, has low dose effects on toxicology and genotoxicity. Herein, we constructed a highly porous crystalline covalent organic framework (COF, CTpPa-2)-modified glassy carbon electrode (GCE) for the electrochemical sensing of BPA and BPS. The electrochemical properties of the CTpPa-2/GCE were characterized using galvanostatic charge-discharge, cyclic voltammetry and differential pulse voltammetry. The CTpPa-2/GCE exhibited remarkable electrocatalytic activity, and the electrochemical responses for BPA and BPS were found to be linear in the concentration ranges of 0.1–50 μM and 0.5–50 μM with detection limits of 0.02 μM and 0.09 μM (S/N = 3), respectively. Moreover, the fabricated sensor was utilized to determine BPA and BPS in bottle samples with recoveries of 87.0%–92.2% and migration rates of 13.2%–28.0%.
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ELECTROCHIMICA ACTA
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2020
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IF 6.215
Tong Wu,Guiru Sun,Wei Lu,Liping Zhao,Alain Mauger,Christian M. Julien,Liqun Sun,Haiming Xie,Jinghai Liu
The inhibition of the shuttle of lithium polysulfides (LiPSs) and enhancement of the electrical conductivity of the cathodes are desirable to improve the performance of lithium-sulfur batteries. In the present work, we report a cathode acting simultaneously as a highly efficient LiPSs immobilizer and sulfur host. It is composed of sulfur embedded inside a hollow sphere, the shell of which is made of hollow black TiO 2 (b-TiO 2 ) spherical nanoparticles . The particles of the composite are then coated with a polypyrrole (PPy) layer to form the active cathode element (b-TiO 2 /S@PPy). The particular topology of the b-TiO 2 layer provides enough space to alleviate the volume expansion of LiPSs. Equally, the PPy coating layer can not only improve the conductivity of the cathodes, but also restrain the shuttle of LiPSs by chemical adsorption . With the sulfur content of 59.6 wt% corresponding to a sulfur loading of 1.5–1.8 mg cm −2 , the lithium-sulfur batteries with the b-TiO 2 /S@PPy cathode exhibits a high initial discharge capacity (1374 mAh g −1 at 0.1C), a superior cycling stability (910 mAh g −1 after 200 cycles at 0.1C), and a good rate performance (725 mAh g −1 at 2C).
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危险品化学品经营许可证（带存储）