JOURNAL OF POWER SOURCES
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2023
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IF 9.2
Xiaoqing Liu,Guangshe Li,Xin Zhang,Jinjiang Wu,Chuang Yu,Linfeng Peng,Dan Zhang,Liping Li
Vanadium-based compounds have earned incremental attention as cathode for aqueous zinc ion batteries (AZIBs) due to their ideal electrical conductivity , rich valence states and flexible crystal structures. Unfortunately, their storage mechanisms are confusing and not well-established, especially for nitride . Herein, we have constructed a cubic vanadium nitride and nitrogen/sulfur doped carbon composite (VN@N/S–C) as a cathode for AZIBs. An in-depth examination of ex-situ XRD and XPS reveal that the electrochemical reduction during the first discharge process promotes a structural transformation of cubic VN to layered Zn 3+ x (OH) 2 V 2 O 7 ·2H 2 O, thus permitting subsequent insertion of Zn 2+ in such layered structure. Ex-situ SEM studies of electrodes further identify a morphology change of nanoparticles to nanosheets , corresponding to VN and Zn 3+ x (OH) 2 V 2 O 7 ·2H 2 O, respectively. New storage mechanism-the electrochemical reduction combined with the contributions from Zn 2+ (de)intercalation, furnishes the VN@N/S–C cathode a high discharge capacity of 232 mA h g −1 after 400 cycles at 4 A g −1 and good rate performance (252 mA h g −1 at 6 A g −1 ). Even at a low temperature of 0 °C, the cathode still delivers an excellent capacity of 361 mA h g −1 after 300 cycles at 1 A g −1 . This study offers a hint to improve the understanding on cubic structure for AZIBs.
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ACS Applied Materials & Interfaces
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2023
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IF 9.5
Nankun Chen,Yiyao Xiao,Chao Wang,Jiahao He,Ningning Song
Ternary hierarchical Fe3O4@C@MoS2 composites and binary hierarchical Fe3O4@C composites were successfully fabricated by a modified mixed solvothermal method, a self-oxidation polymerization method, and a hydrothermal process. Their magnetic properties and microwave absorption performance were investigated. Dual resonance behavior was observed in the Fe3O4@C@MoS2 composites. One of the resonances was attributed to natural resonance with a resonance frequency of 2.58 GHz, which was much higher than that for Fe3O4 bulk (1.5 GHz). The other originated from the superparamagnetic/ferromagnetic relaxation with a resonance frequency of 12.45 GHz. The minimum reflection loss (RLmin) reached −64.30 dB with a matched thickness of 2.24 mm at 11.64 GHz, and the maximum effective absorption bandwidth (EABmax) covered 6.39 GHz with a matched thickness of 1.89 mm. In addition, the maximum Radar cross section (RCS) reduction value reached 31.90 dB m2 at a scattering angle of 0°. Electron holography analysis confirmed a dense magnetic absorption network in the Fe3O4@C@MoS2 composites. The boost in microwave absorption performance was caused by the synergistic effects of magnetic and dielectric properties owing to the ternary hierarchical structure, shape magnetic anisotropy, and incorporation of 1T/2H MoS2. Besides, the binary hierarchical Fe3O4@C composites also exhibited good absorbing performance caused by natural resonance, with an RLmin of −52.90 dB at 5.80 mm, an EABmax of 5.98 GHz at 3.38 mm, and a relatively high RCS reduction value of 13.04 dB m2 at θ = 20°. This work paves the way for designing multicomponent hierarchical absorbers with broadband and intensive microwave absorption.
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Small
·
2023
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IF 13.3
Zizhuang He,Hanxiao Xu,Lingzi Shi,Xiangru Ren,Jie Kong,Panbo Liu
The synergistic effect of hollow cavities and multiple hetero-interfaces displays huge advantages in achieving lightweight and high-efficient electromagnetic wave absorption, but still confronts huge challenges. Herein, hierarchical Co 2 P/CoS 2 @C@MoS 2 composites via the self-sacrificed strategy and a subsequent hydrothermal method have been successfully synthesized. Specifically, ZIF-67 cores first act as the structural template to form core-shell ZIF-67@poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) (ZIF-67@PZS) composites, which are converted into hollow Co 2 P@C shells with micro-mesoporous characteristics because of the gradient structural stabilities and preferred coordination ability. The deposition of hierarchical MoS 2 results in phase transition (Co 2 P→Co 2 P/CoS 2 ), yielding the formation of hierarchical Co 2 P/CoS 2 @C@MoS 2 composites with hollow cavities and multiple hetero-interfaces. Benefiting from the cooperative advantages of hollow structure, extra N,P,S-doped sources, lattice defects/vacancies, diverse incoherent interfaces, and hierarchical configurations, the composites deliver superior electromagnetic wave capability (−56.6 dB) and wideband absorption bandwidth (8.96 GHz) with 20 wt.% filler loading. This study provides a reliable and facile strategy for the precise construction of superior electromagnetic wave absorbents with efficient absorption attenuation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Rui Sui,Jing Chai,Xuerui Liu,Jiajing Pei,Xuejiang Zhang,Xingdong Wang,Yu Wang,Juncai Dong,Wei Zhu,Wenxing Chen,Liang Zhang,Zhongbin Zhuang
The metal-nitrogen-carbon (M-N-C) type oxygen reduction reaction (ORR) catalysts are promising for hydroxide exchange membrane fuel cells, but catalysts with further improved performance are challenging. Here, we report the efficient improvement of the ORR activity of M-N-C catalysts by employing highly polarizable metal cation Ag + . Ag, Fe single atomic sites embedded in concave nitrogen doped carbon (Ag 1 Fe 1 /CNC) is successfully synthesized and shows high performance towards ORR, indicating by both the ultra-high half-wave potential of 0.917 V and membrane electrolyte assembly performance of peak power density up to 1.26 W cm −2 . The binding energy of the ORR intermediates on the highly polarizable Ag site in Ag 1 Fe 1 /CNC was significantly tuned by the adjacent Fe site by more than 0.2 eV, and thus leading to a low theoretical ORR overpotential of only 0.398 V. The employment of the highly polarizable metal cation brings a novel and efficient approach to construct highly active catalysts.
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BIOCHEMICAL PHARMACOLOGY
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2023
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IF 5.8
Dongchao Xu,Ajuan Liu,Qiang Liu,Hongchen Zhang,Mengyao Tian,Ying Bian,Xiaofeng Zhang,Meidan Ying,Hongzhang Shen
Pancreatic ductal adenocarcinoma (PDAC) remains one of the most devastating diseases; it has a considerably poor prognosis and may become the second most lethal malignancy in the next 10 years. Chemotherapeutic resistance is common in PDAC; thus, it is necessary to exploit effective alternative drugs. In recent years, traditional folk medicines and their extracts have shown great potential in cancer treatment. The seed of Lagenaria siceraria (Molina) Standl. is a traditional medicine in Asia. Because of its analgesic effects and ability to reduce swelling, it is often used as an adjuvant treatment for abdominal tumors. Cucurbitacin compounds are extracts abundant in Lagenaria siceraria (Molina) Standl. Here, we found that cucurbitacin C (CuC), a member of the cucurbitacin family, has apparent anti-PDAC therapeutic properties. CuC decreased the viability and suppressed the proliferation of PDAC cells in a time- and dose-dependent manner. Further studies revealed that CuC inhibited cell migration and invasion by inhibiting epithelial-mesenchymal transition (EMT). In addition, G2/M arrest was induced, and the apoptotic pathway was activated. Transcriptomic and bioinformatic analyses showed that CuC inhibited the cGMP-PKG-VASP axis, increasing the content of cGMP to restore tumor characteristics. The antitumor activity of CuC in vivo was verified through animal experiments, and no obvious side effects were observed. Overall, our study indicates a candidate therapeutic compound for PDAC that is worthy of further development.
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MICROCHEMICAL JOURNAL
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2023
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IF 4.8
Xiaoqing Lv,Zhengtai Ma,Jiaqi Xu,Zhen Wang,Guixian Zhu,Beiju Huang
The paper-based analytical platforms have been applied in biochemical detection and environmental monitoring due to their low cost and easy operation. Despite their advantages, the complexity of fabrication has limited their further application. Here, a simple and innovative approach using parylene C, a material commonly used in semiconductors, is reported to fabricate paper-based chips and construct a point-of-care testing (POCT) platform through smartphones. Parylene C is deposited on the filter paper through a polydimethylsiloxane (PDMS) clamp and forms a hydrophobic barrier. A three-channel paper-based chip was utilized to detect aluminum (Al) ions on a smartphone platform by the chromogenic method. The color change after Al 3+ detection is represented with △E which was photographed and calculated by app on smartphone. The detection limit is 0.05 mg/L and the detection range is from 0.05 mg/L to 10 mg/L which indicates the application potential in the field of biochemical detection. This new paper-based sensing method and smartphone-based portable detection platform are simple, low-cost, fast, and highly sensitive, and provides a potential application for on-site, visual detection of ions and even other substances.
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CHEMICAL PHYSICS LETTERS
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2023
·
IF 2.8
Bo Li,Mohib Ullah Khan,Cheng Qv,Lin Chen,Ying Xiong,Lixin Zhang,Mingzai Wu
Conventional flexible zinc-air batteries (ZABs) electrolytes are mainly made of hydrogels, and thus can freeze at low temperatures and cause cell failure. Here, we report a gel electrolyte consisting of agar, polyacrylamide and dimethyl sulfoxide with high ionic conductivity (24 mS cm −1 ) at −30 °C. The flexible ZABs based on this gel electrolyte showed good cycling stability (45 h) at −30 °C, which provides a new idea for the development of low-temperature resistant flexible ZABs.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Qiaona Liu,Xin Han,An Qian,Xin Pu,Lei Ye,Jichang Liu,Jian Zhang,Jinshan Zhan
The development of highly active and stable cocatalysts using earth-abundant transition metals to replace noble metals is important for the application of photocatalytic hydrogen production technology. In this study, two-dimensional (2D) carbon-encapsulated NiCo bimetallic nanosheets (NiCo@C) was designed for the first time as a new co-catalyst to synergistically combine with graphitic carbon nitride (g-C 3 N 4 ) and promote its hydrogen evolution . The NiCo@C cocatalysts were using an innovative molten salt method by using nickel hexacyanocobaltate Ni 3 [Co(CN) 6 ] 2 (Ni-Co PBA) nanocubes as precursor. The Ni-Co PBA nanocubes undergo dissolution growth and salt templating processes to form bimetallic 2D nanosheets during charring in molten salt media, and combine with 2D g-C 3 N 4 to form NiCo@C/g-C 3 N 4 photocatalyst . The optimized NiCo@C/g-C 3 N 4 photocatalyst significantly improved the H 2 evolution activity, and the H 2 evolution rate reached 3791.07 μmol·g −1 ·h −1 , which was 5 times higher than that of the particle CoNi/g-C 3 N 4 (636.89 μmol·g −1 ·h −1 ). The H 2 evolution activity was also comparable to that of the photocatalytic activity of 1.0% Pt/g-C 3 N 4 system, indicating that the earth-abundant NiCo@C can replace noble metal as a cocatalyst to significantly enhance the photocatalytic performance of 2D photocatalysts. The conversion of three-dimensional Ni-Co PBA into carbon-coated 2D metal nanosheets by molten salt-assisted pyrolysis provides a feasible approach to explore the synthesis and design of efficient and robust non-precious metal catalysts.
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ENERGY & FUELS
·
2023
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IF 5.3
Dongju Fu,Ziyue Zhu,Shaojun Gao,Hui Qi,Xuguang Liu,Weifeng Liu,Shaozhong Zeng
In this paper, hollow Co/N-C@NiCo2O4 spheres assembled by nanoparticles were developed as efficient bifunctional catalysts for zinc–air batteries. The hollow structure is synthesized with ZIF-67 as a reactant template. NiCo-LDH grown on the ZIF-67 surface maintains its structural integrity during heat treatment and reduces the agglomeration of the material, which promotes charge transport during the catalytic process. The hollow structure has a specific surface area of 124.3 m2 g–1 with rich catalytic active sites. As expected, the power density of the Co/N-C@NiCo2O4-based Zn–air battery is 176 mW cm–2 and the specific capacity is 745 mAh g–1, with 1.45 V open-circuit voltage and 100 h cycling life, much better than those of the 20% Pt/C-RuO2-based Zn–air battery (1.42 V, 133 mW cm–2, 721 mAh g–1).
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Journal of Energy Storage
·
2023
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IF 9.4
Yiqing Lu,Zhimin Zou,Yu Bai,Xin Wang,Hongwang Zhang,Chunhai Jiang
Commercialization of SiO/graphite (SiO/G) composite anode material has been partially conducted in modern-model Li-ion batteries but is still limited by its relatively high cost and inferior stability. Improving the Li-ion storage performance as well as lowering the manufacturing cost of SiO/G anode has been the ongoing target of many studies. Herein, a low cost SiO/G anode with good Li-ion storage performance is developed by facilely integrating SiO nanoparticles into spent graphite (SG) extracted from used LiFePO 4 batteries. The loose SG particles after repeated charge/discharge cycles can be easily exfoliated and combined with the SiO nanoparticles during the mechanical ball-milling treatment. Further processing the composite into spherical structure by spray-drying and pyrolysis results in practically applicable anode materials. The SiO/SG/C anode with a SiO mass ratio of 30 % exhibits the best overall performance including an excellent rate capability (385 mAh g −1 at 3 A g −1 ) and encouraging cycle stability (442 mAh g −1 after 300 cycles at 1 A g −1 ). The coin-type full cells coupling the pre-lithiated spherical SiO/SG anode and NCM811 cathode delivers a high energy density of 461 Wh kg −1 (based on the active masses of both electrodes) and good cycle performance (74.4 % capacity retention at 0.5C after 100 cycles). This work not only provides a high performance yet low cost SiO/G anode material, but explores a high value added way for the reuse of SG, thus can practically push forward the development of LIBs .
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
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IF 16.6
Du Xinze,Fan Hongjun,Liu Shenglin,Zhang Z. Conrad
C−C bond forming reaction by alkylation of aryl rings is a main pillar of chemistry in the production of broad portfolios of chemical products. The dominant mechanism proceeds via electrophilic substitution of secondary and tertiary carbocations over acid catalysts, forming multiple aryl alkylation products non-selectively through all secondary and tertiary carbons in the alkyl chains but producing little α-C alkylation products because primary carbocations are poorly stable. Herein, we report that anatase TiO 2 (TiO 2 -A) catalyzes nucleophilic α-C alkylation of phenols with alcohols in high selectivity to simply linear alkylphenols. Experimental and computational studies reveal the formation of Ti=C− bond with the α-carbon of the alkyl group at oxygen vacancies of the TiO 2 -A surface. The subsequent α-C alkylation by selective substitution of phenol ortho- C−H bond is verified by deuterium exchanged substrate and DFT calculations.
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Journal of Energy Storage
·
2023
·
IF 9.4
Haidong Xie,Chunping Hou,Yuqing Qu,Hui Tian,Hui Lu,Jiandong Wu,Shaolin Yang,Yong Ma
SiO x has become one of the most promising anode materials for lithium ion batteries due to its high specific capacity, abundant natural resources and suitable lithium insertion and extraction voltage. However, the low conductivity and the poor cycle performance seriously hinder its practical application. In here, a simple and effective method is proposed to disperse SiO x between carbon materials including flake graphite, reduced graphene oxide (rGO) and carbon nanotubes (CNTs), and then micron-sized N-SiO x /graphite/rGO-CNTs@C (N-SiO x /C@C) composite with dense structure is prepared by coating and pyrolysis of pitch. The synergistic effect of various carbon materials is beneficial to improve the conductivity of the material, and maintain the structural integrity during the cycle. The obtained N-SiO x /C@C anode exhibits high reversible capacity (980.2 mAh·g −1 ), excellent cycle stability (70 % capacity retention after 500 cycles at 0.5 A·g −1 ) and excellent rate performance (491.9 mAh·g −1 specific capacity of at 5 A·g −1 ). The strategy provided here effectively improves the electrochemical performances of SiO x , and the prepared materials show great application potential in the field of lithium ion batteries.
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