JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Shan Chen,Yiping Zheng,Shijing Chen,Biao Huang,Xianzhao Tian,Yueqiu Gong
Dielectric capacitors are characterized by high power density, fast charge/discharge rates and long cycle life. However, their practical energy storage applications are severely limited by a high remnant polarization ( P r ) and an intrinsically low breakdown field strength ( E b ) To address these issues, SrTiO 3 /Bi x Ba(1- x )Zr 0.35 Ti 0.65 O 3 /SrTiO 3 (STO/B x BZT/STO) ( x = 0, 0.02, 0.04, 0.06) multilayer ferroelectric films, with SrTiO₃ (STO) as both buffer and capping layers, were fabricated via the sol-gel method. We found that appropriate Bi 3 + doping significantly promoted crystallization and simultaneously induced the formation of defect dipoles, resulting in a dense and uniform microstructure. Meanwhile the bilayer compressive stress from the STO interface layers optimized the domain structure, facilitating a faster response of the polar nanoregions to electric fields. These synergistic effects led to a higher maximum polarization and a lower P r . In particular, the STO/BBZT/STO-0.02 film exhibited excellent overall energy storage performance: under a E b of 4568 kV/cm, it achieved a high recoverable energy storage density ( W rec ) of 41.6 J/cm³ with an energy storage efficiency ( η ) of 71.36%. Notably, after 10 8 cycles of ferroelectric fatigue testing, the variation in W rec was only 8.15%, while maintaining an excellent efficiency ( η = 88.99%). The film also demonstrated good frequency stability (1∼10 kHz) and temperature stability (20∼120 °C). This synergistic optimization strategy holds great promise for providing a new approach to the development of next-generation high-performance dielectric capacitors.
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高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Xu Yang,Kaijia Zuo,Nianben Zheng,Zhiqiang Sun
Minimizing polarization losses and enhancing stability through electrode engineering are essential for improving the efficiency of the vanadium redox flow battery (VRFB) systems. In this work, we present an asymmetric VRFB featuring a nitrogen-doped graphite felt (N-GF) with a carbon nanofiber network as the positive electrode, and a bismuth-decorated graphite felt (Bi-GF) as the negative electrode. The N-GF enhances the redox kinetics of the V 5+ /V 4+ pairs and provides structural durability, while the Bi-GF mitigates the hydrogen evolution reaction and facilitates the V 3+ /V 2+ reaction. As a result, the asymmetric cell achieves an energy efficiency of 90.72% at 100 mA cm −2 and maintains 80.52% at 250 mA cm −2 . After 200 cycles at 250 mA cm −2 , the energy efficiency exhibits a minimal average decay rate of only 0.017% per cycle, while the capacity retention remains at 73.47%. Long-term cycling analysis further reveals that N-GF preserves its nanofiber network and surface chemistry, whereas the pristine graphite felt suffers from serious carbon corrosion. This work demonstrates that rational asymmetric electrode design is an effective strategy to achieve both high energy efficiency and long-term durability in VRFBs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
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IF 6.371
Zongyu Wang,Haowei Li,Liyan Dang,Zepeng Pu,Zhengguan Xu,Aiping Fu,Hongliang Li
The composites of reduced graphene oxide (rGO) encapsulated porous silicon (P-Si) microspheres are constructed using metallic aluminum as a bi-functional reducing agent at low temperatures. The preparation process of P-Si is carried out in a special reactor at 300 °C. For the reaction, SiO 2 is used as the silicon source and AlCl 3 is added to maintain the smooth progress of the thermite reduction reaction. Subsequently, graphene oxide is reduced by aluminum powder in an acidic liquid phase system and then the P-Si/rGO composite material is constructed by freeze-drying technique. As a kind of promising anode for lithium-ion batteries (LIBs), the porous structure of silicon microspheres can relieve the internal stress caused by volume expansion and shorten the diffusion path of lithium ions during charge/discharge processses. The flexible graphene layers can adapt the volume effect of the P-Si microspheres and therefore maintain the structural stability of the composites and enhance the electrical conductivity . The obtained P-Si/rGO composite material exhibits excellent electrochemical performance, which can maintain a superior capacity of 837 mAh g −1 upon 500 cycles under a current density of 0.5 A g −1 and exhibit satisfied cycling stability with a capacity of 704 mAh g −1 after 1000 cycles at a 1 A g −1 current density.
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高影响因子
Biomaterials Advances
·
2022
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IF 0
Zhiping Fang,Yonghao Xiao,Xue Geng,Liujun Jia,Yuehao Xing,Lin Ye,Yongquan Gu,Ai-ying Zhang,Zeng-guo Feng
Increasingly growing problems in vascular access for long-term hemodialysis lead to a considerable demand for synthetic small diameter vascular prostheses, which usually suffer from some drawbacks and are associated to high failure rates. Incorporating the concept of in situ tissue engineering (TE) into synthetic small diameter blood vessels, for example, thermoplastic poly(ether urethane) (TPU) ones, could provide an alternative approach for vascular access that profits from the advantages of excellent mechanical properties of synthetic polymer materials (early cannulation) and unique biointegration regeneration of autologous neovascular tissues (long-term fistulae). In this study, a kind of heparinized small diameter (d = 2.5 mm) TPU/poly(ε-caprolactone) (TPU/PCL-Hep) bi-layered blood vessels was electrospun with an inner layer of PCL and an outer layer of TPU. Afterward, the inner surface heparinization was conducted by coupling H 2 N-PEG-NH 2 to the corroded PCL layer and then heparin to the attached H 2 N-PEG-NH 2 via the EDCI/NHS chemistry. Herein a heparinized PCL inner layer could not only inhibit thrombosis, but also provide sufficient space for the neotissue regeneration via biodegradation with time. Meanwhile, a TPU outer layer could confer the vascular access the good mechanical properties, such as flexibility, viability and fitness of elasticity between the grafts and host blood vessels as evidenced by the adequate mechanical properties, such as compliance (4.43 ± 0.07%/ 100 mmHg), burst pressure (1447 ± 127 mmHg) and suture retention strength (1.26 ± 0.07 N) without blood seepage after implantation. Furthermore, a rabbit carotid aortic replacement model for 5 months was demonstrated 100% animal survival and 86% graft patency. Puncture assay also revealed the puncture resistance and self-sealing (hemostatic time < 2 min). Histological analysis highlighted neotissue regeneration, host cell infiltration and graft remodeling in terms of extracellular matrix turnover. Altogether, these results showed promising aspects of small diameter TPU/PCL-Hep bi-layered grafts for hemodialytic vascular access applications.
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PubMed
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 9
·3500-3509
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IF 8.067
Dongnv Jin,Jiliang Ma,Runcang Sun
Coupling a semimetal with a semiconductor on nitrogen-doped carbon for photocatalytic reforming of biomass-derived feedstocks into high value-added chemicals is of great significance; however, no success has been achieved to date. Here, uniformly dispersed Bi/Bi2O3 nanospheres with a Mott–Schottky heterojunction embedded on the nitrogen-doped biochar nanosheets (Bi/Bi2O3@N-BC) were developed and successfully used in photocatalytic biomass-reforming to lactic acid. A built-in electric field between the interfaces of Bi and Bi2O3 was constructed via the Schottky effect of the Bi/Bi2O3 heterojunction, resulting in the rapid separation/migration of electrons–holes; whereas the N-BC facilitates the adsorption of reactants and the mass transfer of products or by-products. The highest yield of lactic acid reached was 91.21%, and Bi/Bi2O3@N-BC displayed excellent stability, reusability and universality. The experimental results indicated that the contents of photoinduced h+, ˙O2−, ˙OH and 1O2 increased with prolonging the visible-light irradiation time, and trapping tests suggested that ˙O2−, 1O2 and h+ promoted the lactic acid production in turn, whereas ˙OH inhibited the reaction. A 1000-fold scale-up experiment showed that the economically and environmentally viable system has potential for application in the industrial production of lactic acid, and this work also provides an efficient strategy for the development of functional photocatalysts and photocatalytic biorefinery.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Min Sang,Junshuo Zhang,Shuai Liu,Jianyu Zhou,Yu Wang,Huaxia Deng,Jun Li,Ji Li,Shouhu Xuan,Xinglong Gong
Smart wearable devices with mechanical anti-impact property and electromagnetic interference shielding performance are highly required for providing comprehensive and effective protection for human beings under special conditions. Herein, a multifunctional SSE/MXene-NWF/SSE (SMS) sandwich composite with multiple sensing properties, electromagnetic interference shielding performance and anti-impacting ability was developed. By decorating conductive MXene onto the middle non-woven fabric (NWF), the as-fabricated SMS composite protects human from the harmful electromagnetic radiation with the shielding effectiveness up to 58 dB. The shear stiffening elastomer (SSE) whose storage modulus increases with the shear frequency displays typical shear stiffening effect, and thus confers SMS sandwich composite outstanding anti-impacting and safe-guarding properties which can dissipate nearly 97% impact energy. In addition, this SMS sandwich composite also meets the development needs of smart wearable devices, which can be comfortably attached onto human parts to monitor different human motions. Moreover, the intelligent alarm system and mechanical manipulator based on SMS sensor shows the promising application in wireless transmission and human–machine interaction. Finally, the designed SMS-based sensor array further displays its multi-perceptive characteristic under various stimuli as well as double-safeguarding abilities under impact and electromagnetic radiation. This work opens a new perspective for the development of multifunctional composite as smart wearable devices with anti-impacting and electromagnetic interference shielding properties for the comprehensive safeguarding of human beings.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yi Wen,Zheng Huang,Min Zhao,Longshan Zhao
The discharge of industrial heavy metal wastewater not only leads to environmental pollution, but also harms human health, so it is imperative to control heavy metal pollution. In the current work, a sequence of anatase/brookite TiO 2 @COF with different mass ratios, bi-phase TiO 2 and bare COF were successfully synthesized by simple hydrothermal synthesis. The photocatalytic activity of the prepared catalysts was assessed by reducing Cr(Ⅵ) in model pollutant (K 2 Cr 2 O 7 ). Under the condition of pH = 3, the Cr(Ⅵ) reduction rate of TiO 2 @COF-4 was as high as 99.19% in 30 min. The photocatalytic activity of TiO 2 @COF-4 remained stable in four consecutive cycles, suggesting that it has a potential application prospect for the removal of Cr(Ⅵ) in the actual environment. The morphology and structure of photocatalysts were observed by different techniques (SEM/EDS, HRTEM, BET analysis, XRD, FTIR and XPS). The specific reasons for the enhancement of photocatalytic performance of materials were explored by different methods (PL, UV–vis DRS, Mott-Schottky plots, I-T curves and EIS). Finally, we concluded that the photocatalytic system of TiO 2 @COF-4 may follow the typical direct Z- scheme mechanism. This work provides an effective solution for the water treatment of heavy metal pollution.
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高影响因子
Biomaterials Advances
·
2022
·
IF 0
Subramani Kandhasamy,Yiming Zeng
Bronchial and pleural injuries with persistent air leak pose a threat in the repair and regeneration of pulmonary diseases. The need to arrive at a highly efficient therapy for closure of bronchopleural fistula (BPF) so as to effectively suppress inflammation, infection and repair the damaged pleural space caused by cancer as well as contractile restoration of bronchopleural scars remain a significant clinical challenge. Herein, we have designed and developed potent bioactive vitamin K3 carnosine peptide (VKC)-loaded spun SF fibroin fibers/collagen bi-layered 3D scaffold for bronchopleural fistula tissue engineering applications. The VKC drug showed excellent cell viability in human bronchial epithelial cells (HBECs), in addition to its pronounced higher cytotoxicity against the A549 lung cancer cell line with an IC 50 of 5 μg/mL. Furthermore, VKC displayed a strong affinity with the catalytic site of EGFR (PDB ID: 1M17 ) and VEGFR2 (PDB ID: 4AGD , 4ASD ) receptors in molecular docking studies. Following which the spun SF-VKC (primary layer) and collagen film (top layer) constructed bi-layered CSVKC were structurally elucidated and its morphological, physicochemical and biological characterizations were well examined. The bi-layered scaffold showed superior biocompatibility and cell migration ability in HBECs than other scaffolds. Interestingly, the CSVKC revealed rapid HBECs motility towards scratched regions for fast healing in vitro bronchial tissue engineering. In vivo biocompatibility and angiogenesis studies of the prepared scaffolds were evaluated and the results obtained demonstrated excellent new tissue formation and neovascularization in the bi-layered architecture rather than others. Therefore, our results suggest that the potent antibacterial and anticancer therapeutic agent (VKC)-impregnated silk fibroin fibers/collagen bi-layered 3D biomaterial could be useful in treating cancerous BPF and pulmonary diseases in future.
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PubMed
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Wenjie Li,Lifen Li,Qineng Xia,Song Hong,Lijun Wang,Zhibo Yao,Tai-Sing Wu,Yun-Liang Soo,Hao Zhang,Tsz Woon Benedict Lo,Alex W. Robertson,Qingya Liu,Leiduan Hao,Zhenyu Sun
Electrochemical CO 2 reduction (ECR) to commodity chemicals offers a promising way for mitigating the greenhouse effect and driving the transition from fossil-fuel dependence to a sustainable economy. To this end, the design and development of active and robust electrocatalysts is key. Here we report for the first time that incorporation of bismuth (Bi) single atoms on defective CuO could significantly enhance the ECR reaction to C 2 H 4 by decreasing C–C coupling barriers. The overpotential for C 2 H 4 production is lowered by at least 50 mV, along with a two-fold improvement in the faradaic efficiency, reaching 60% at 400 mA cm −2 . The high performance is maintained even after 20 h of consecutive electrolysis. Control experiments along with density functional theory calculations suggest that the joint incorporation of Bi and oxygen vacancies greatly promotes CO 2 adsorption and lowers C–C coupling energy barriers, thereby improving the C 2 H 4 selectivity.
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Xiang Wang,Xin Yan,Bin-cheng Wang,Wei Xue,Chang-ren Zhou,Yi Zhang,Zong-hua Liu
Blood lead poisoning is a universal and severe health problem that greatly threatens human health in various industries. Elimination of blood lead relying on chelating agents and combination with hemoperfusion adsorbents has achieved considerable progress, but it is still suffering from the compromised selectivity of adsorbents as well as in absence of real time monitoring during treatment. Herein, we proposed a selective blood lead adsorbent integrated with real-time visualized/electrochemical bi-modal monitoring based on TMPyP-bound guanosine-borate (GB) supramolecular hydrogel as potential smart hemoperfusion device. The GB hydrogel possessed stability in physiological environment, self-healing ability resistant to fluid shear, blood compatibility, selective adsorption of lead ions superior to conventional adsorbents, anti-fouling performance to blood components and renewability. Benefiting from binding with TMPyP and the intrinsic conductivity, GB hydrogel was endowed with the ability to qualitatively diagnose the presence of blood lead via simple color change and quantitatively reflect the amount of adsorbed lead from blood accurately through electrochemical technique . This work puts forward an integrated treatment/monitoring hemoperfusion device with high selectivity, simple fabrication and low-cost, providing a paradigm for next generation design of intelligent, monitorable theranostic hemopurification system, which is also an extensible platform for the other research fields such as environmental monitoring and remediation.
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PubMed
高影响因子
DYES AND PIGMENTS
·
2020
·
IF 4.613
Yong Li,Jun-Dan An,Tian-Tian Wang,Yang-Fan Shi,Jian-Zhong Huo,Xiang-Xia Wu,Yuan-Yuan Liu,Bin Ding
In the last thirty years, light-emitting metal organic frameworks (MOFs) sensors have attracted immense interest by scientists because these functional coordination materials possess good framework stability and high surface areas, and excellent stability in adsorption, separation, catalysis, etc. These MOFs-based sensors have the broad applications in the national security, surrounding protection and mankind's health. In this work, a new bi-functional ligand H 3 L (H 3 L = 4'-(1H-tetrazole-5)-biphenyl-2,3-dicarboxylic acid) simultaneously containing tetrazole and carboxylate groups can be synthesized. Further, the ultra-stable tetrazolium Cadmium (II) MOFs {[Cd 2 (μ 7 -L) (μ 3 -OH) (H 2 O) 2 ]·1.3H 2 O} n ( 1 ) has been successfully prepared under the solvo-thermal conditions. In 1 , neighboring tetranuclear cadmium (II) building blocks are inter-linked through the bridging tetrazole moieties and aromatic bi-phenyl backbones forming the 3D micro-porous framework. It is interesting that 1 exhibits excellent chemical stability, the coordination framework of 1 can be kept not only in various different solvents but also the water environment with pH varying from 2 to 12 for 24 h. Powder X-ray diffraction (PXRD) patterns have been investigated demonstrating these bulky as-synthesized samples 1 are pure phases. Compared with other coordination polymers, 1 has some other advantages such that 1 possesses good water dispersibility , excellent photo-luminescence emissions and fluorescence stability, which has the potential to be utilized as the excellent chemical sensor. Fluorescent characterization reveals that 1 also can behave highly sensitive and real-time discrimination of acetylacetone (Hacac) with good reusability (high quenching efficiency K sv for Hacac: 2.5 × 10 5 M −1 ) and extremely low detection limit values (For Hacac: 35 μM). On the other hand, 1 can behave highly sensitivity, recyclability and real-time chemical sensing for antibiotics nitrofurazone (NFZ) and nitrofurantoin (NFT) (K sv for NFZ: 5.9 × 10 6 M −1 and NFT: 9.0 × 10 6 M −1 ) and extremely low detection limit values (For NFZ: 2.2 μM and NFT: 1.4 μM).
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Siran Zhang,Kang An,Shuangshuang Li,Ziyang Zhang,Ruolin Sun,Yuan Liu
A new scheme for constructing bi-active sites of highly dispersed Pt and oxygen vacancies on a catalyst was put forward in this study. Pt/LaCo x Ni 1−x O 3 /SiO 2 was synthesized by reducing LaCo x Ni 0.87−x Pt 0.13 O 3 with the structure of perovskite loaded on silica. The catalytic performance for carbon monoxide oxidation over the catalysts were studied. The catalysts were characterized via using XRD, XPS, XAFS, N 2 adsorption–desorption, H 2 -TPR, TEM, O 2 and CO-TPD techniques. The results pointed out that nanocrystal lines of LaCo x Ni 0.87−x Pt 0.13 O 3 were supported on SiO 2 . Pt clusters could be formed through reduction process at 300 °C and highly dispersed on catalyst’s surface, and the catalyst transformed to Pt/LaCo x Ni 1−x O 3 /SiO 2 ; at the same time, oxygen vacancies also formed on the surface of LaCo x Ni 1−x O 3 . The catalytic test revealed that LaCo 0.44 Ni 0.43 Pt 0.13 O 3 /SiO 2 displayed high activity and good stability for the oxidation of CO. The highly dispersed closely contact bi-active sites, the confinement of oxygen vacancies and strong interaction between Pt clusters and support were responsible for the significant catalytic activity and stability of LaCo 0.44 Ni 0.43 Pt 0.13 O 3 /SiO 2 catalyst.
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