CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Li Yang,Xiao Huang,Changfei Zou,Xiyuan Tao,Lei Liu,Kaili Luo,Peng Zeng,Qiushi Dai,Yongfang Li,Lingguang Yi,Zhigao Luo,Xianyou Wang
Lithium-sulfur (Li–S) batteries are attractive due to their high theoretical energy density . However, conventional Li–S batteries with liquid electrolytes undergo polysulfide shuttle-effect and lithium dendrite formation during charge/discharge process, leading to poor electrochemical performance and safety issues. Garnet type Li 7 La 3 Zr 2 O 12 (LLZO) solid-state electrolyte (SSE) restricts the penetration of polysulfides and exhibits high ionic conductivity at room temperature (RT). Herein, Li 6.5 La 3 Zr 1.5 Nb 0.5 O 12 (LLZNO) ceramic electrolyte using Li 3 PO 4 (LPO) as sintering aids (LLZNO-LPO) is prepared by the rapid sintering method and is applied to construct a shuttle-effect free solid-state Li–S battery . The SSE displays high conductive pure cubic-LLZO phase; during the rapid sintering, LPO melts and junctions the voids between the grains, thus improves Li + conductivity. As a result, the LLZNO-LPO ceramic electrolyte with Li + conductivity of 4.3 × 10 −4 S cm −1 and high critical current density (CCD) of 1.2 mA cm −2 is obtained at RT. The Li–S solid-state battery which utilizes LLZNO-LPO ceramic electrolyte can deliver an initial discharge capacity of 943 mA h·g −1 and 602 mA h·g −1 retention after 60 cycles. In the same time, the initial coulombic efficiency is as high as 99.5%, indicating that the SSE can effectively block the polysulfide shuttle towards the Li anode and fulfill a shuttle-free Li–S battery.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Jing Zhang,Caiyin You,Weihua Zhang,Jian Wang,Shaohua Guo,Rong Yang,Yunhua Xu
Improving the reaction kinetics of cathode and preventing the dissolution of polysulfides are two of the key strategies of developing the high-performance lithium-sulfur (Li-S) batteries. Herein, we propose a multi-porous conductive architecture through bridging conductive TiN nanoparticle over the surface of CNT-S composite. The as-prepared TiN@CNT-S composite cathode delivers the superior initial specific capacity of 1269 mAh g −1 at 0.05C and as high as 586 mAh g −1 at 2C. The reversible capacity of the TiN@CNT-S composite cathode is about two times higher than the bare cathode without TiN conductive bridging at 1C over 400 cycles. A high areal capacity of 4.0 mAh cm −2 was realized for the TiN@CNT-S composite cathode with a high areal sulfur loading of 5.4 mg cm −2 at a current rate of 0.5C over 50 cycles. The enhancements in the electrochemical performances are mainly ascribed to the TiN bridged highly conductive structure; the formation of the strong chemical interaction of S-N-Ti bond for polysulfides trapping provided by the chemically polar TiN, which is verified by the ultraviolet visible (UV) spectra and X-ray photoelectron spectroscopy (XPS) analyses.
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 30
·16152-16162
·
IF 14.511
Xin Dai,Kunyang Zou,Weitao Jing,Peng Xu,Junjie Sun,Shengwu Guo,Qiang Tan,Yongning Liu,Tengfei Zhou,Yuanzhen Chen
The electron-deficient property of the atoms in functional materials endow them with tunable adsorption and catalysis effects on polysulfides, thus improving the performance of lithium–sulfur batteries. In this work, Li2B4O7 nanoparticles, which have abundant electron deficiencies derived from the [BO3] Lewis acid units, were uniformly cladded in the carbon nanofibers (LBO–CNF) and employed as interlayers for Li–S batteries. This functionalized interlayer expressed a high adsorption energy of ∼3.6 eV for polysulfides (e.g., Li2S6 and Li2S4) and effectively suppressed the polysulfides' shuttle behavior, delivering a high reversible capacity of 1242.6 mA h g−1 at 0.2C and good cycling performance with a low fading rate of 0.068% per cycle at 1C, thus effectually inhibiting the phenomenon of self-discharge. Besides, the lithiation reaction kinetics was also effectively enhanced, enhancing the rate performance of the battery to 644 mA h g−1 at 5C. This work provides a new strategy to enhance the electrochemical performance of Li–S batteries by applying the compounds of electronic-deficiency B-species and functionalized carbon.
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高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Mengyang Cui,Shisheng Yuan,Bo Jin,Qing Jiang
Sodium-sulfur (Na-S) batteries are believed as the hopeful energy storage and conversion techniques owing to the high specific capacity and low cost. Nevertheless, unstable sodium (Na) deposition/stripping of Na metal anode, low intrinsic conductivity of sulfur cathode, and severe shuttling effect of sodium polysulfides (NaPSs) pose significant challenges in the actual reversible capacity and cycle life of Na-S batteries. Herein, a self-supporting electrode made of nitrogen-doped carbon fiber embedded with cobalt nanoparticles (Co/NC-CF) is designed to load sulfur. Meanwhile, gel polymer electrolyte (GPE) with high ion transfer ability is obtained by in-situ polymerization inside the battery. During the polymerization process, an integrated electrode-electrolyte and a continuous ion-electron conduction network in a composite cathode are constructed inside the Na-S battery. It is noteworthy that the designed GPE demonstrates superior ionic conductivity and effective adsorption of NaPSs that can significantly suppress the shuttle effect. Leveraging the synergistic interplay between the designed GPE and self-supporting cathode, the assembled quasi-solid-state (QSS) Na-S battery exhibits great cycling stability. These experimental results are further corroborated by COMSOL Multiphysics simulations and density functional theory (DFT) calculations, which mechanistically validate the enhanced electrochemical performance. The findings of this study offer new and promising perspectives for advancing the development of next-generation solid-state batteries.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Jieun Ryu,Lam Tan Hao,Hyeri Kim,Somyong Lee,Hyeonyeol Jeon,Dong Soo Hwang,Jeyoung Park,Cheol Hun Park,Dongyeop X. Oh,Jun Mo Koo,Sung Bae Park
Increased consumer awareness of animal welfare and environmental sustainability has driven the development of vegan leather alternatives to natural leather. Fossil-derived leather substitutes offer superior strength and thermal stability but often lack biodegradability, carbon neutrality and aesthetics. Biorenewable alternatives are more eco-friendly but typically suffer from insufficient thermal and mechanical properties and poor moisture resistance. This study presents the synthesis of mechanically reinforced, thermally enhanced and biodegradable poly(ester amide)s (PEAs) incorporating hydrogen bonds as vegan leather coating materials. Synthesized from biobased 1,4-butanediol, adipic acid and nylon 46 via a two-step transesterification/polycondensation process, the resulting PEAs exhibit over eight times higher tensile strength, 3-fold greater toughness, and enhanced thermal stability compared to their constituting homopolymers, poly(butylene adipate) and nylon 46. All PEAs disintegrate within 18 weeks and achieve over 60% biodegradation rate relative to cellulose under composting conditions within one month. When applied to mushroom fabrics, the PEA coating provides haptic sensations (slipperiness and softness) comparable to commercially available leather. Life-cycle assessment indicates that PEA-coated leather imposes considerably lower environmental impacts than both bovine and polyurethane-based leather. This novel material holds promise as a sustainable, high-performance vegan leather substitute.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yanxi Chen,Fanyun Su,Yuqing Rang,Guangli Liu,Xinxing Xu,Yayun Ma,Jingjing Tang,Xiangyang Zhou,Juan Yang
With the explosive growth in demand for lithium-ion batteries (LIBs), the recycling of the valuable metal components in them has become particularly important. However, in the previous recycling of spent LIBs, lithium is easily lost resulting in wasted resources. In this paper, a new simple and efficient selective lithium extraction strategy is developed, which uses a thiourea-assisted subcritical water system to achieve preferential extraction of lithium from spent LIBs. Due to the enhancement of the lithium extraction process by subcritical water and the synergistic effect of S and N in thiourea on the spent LiNi x Co y Mn z O 2 (NCM) cathode powder, 99.9% of lithium is selectively leached into water. Meanwhile, the transition metals (Ni, Co and Mn) in the leaching residue can be leached out by dilute acid, and the corresponding leaching rates are 99.8%, 99.7%, and 99.9%, respectively. In addition, LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) cathode material with good electrochemical performance is successfully regenerated. The process has been economically and environmentally assessed as greatly simplifying the recycling process and establishing a highly efficient recycling route for spent LIBs with low environmental impact.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Yu Wen,Yue Liu,Yanghua Teng,Qiwen Yong,Dongmei Pu,Xiaoqiang Fan,Zhi-Hui Xie
A novel and long-lasting N 3 BD/TiO 2 composite photoanode with stable and superior photoelectrochemical and photoelectrochemical cathodic protection (PECCP) performances was achieved by synthesizing and depositing covalent organic framework (N 3 BD) on titanium oxide (TiO 2 ) nanotube arrays. The composite's increased visible light absorption capability enhanced the galvanic corrosion protection of nickel-phosphorus alloy-coated magnesium alloy (Mg/Ni) through PECCP technology. The open circuit potential (OCP) drops of the Mg/Ni electrode coupling with the N 3 BD/TiO 2 composite were 310 and 630 mV at dark state and under illumination, respectively. They remained relatively stable under intermittent visible light irradiation within 72 h, demonstrating excellent long-term stability. The superior photoelectrochemical and PECCP properties of the N 3 BD/TiO 2 are attributed to forming S-scheme heterojunctions, which effectively promote the separation and transfer of photogenerated electron-hole pairs and retain a strong redox capacity. This finding provides new insight into the design and synthesis of COF-modified photoanode with highly efficient and stable photoelectrochemical and PECCP performances.
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高影响因子
Catalysis Science & Technology
·
2024
·
IF 4.4
Jinsong Song,Chuanhua Zhou,Xi Chen,Yang Gu,Feng Xue,Qiaqing Wu,Dunming Zhu
Cyanate-mediated epoxide ring-opening by halohydrin dehalogenases (HHDHs) is a promising method for the synthesis of important optically pure 2-oxazolidinones. However, the regio- and stereoselectivity of the naturally occurring HHDHs are still not satisfactory for styrene oxides (SOs). We used a structure-guided semi-rational design to improve the selectivity of HHDHs from Ilumatobacter coccineus (IcHheG), followed by site-saturation and combinatorial mutagenesis of Y18, L103, I104, and N196. The double mutant I104F/N196W showed dramatically improved selectivity toward SOs with excellent regioselectivity (>99 : 1) and stereoselectivity (E > 200), producing the corresponding useful and valuable (S)-4-aryl-2-oxazolidinone and (S)-SO with 98% ee. Moreover, it accepted a wider range of styrene oxides with moderate to excellent selectivity. Analysis of the substrate binding conformations showed that the regio- and stereoselectivity improvement in IcHheG was attributed to an increase of geometric distances to the two carbons and the oxygen atom of the epoxide ring for a single stereoisomer. This study elucidated key structural motifs responsible for regulating the regio- and stereoselectivity of IcHheG, offering theoretical guidance for protein engineering of HHDHs from other organisms.
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高影响因子
Petroleum Science
·
2024
·
IF 6
Wei-Peng Wu,Min Yang,Dong-Chen Ma,Ji-Rui Hou,Tuo Liang,Ming Qu,Tao Tan,Biao Yang,Guo-Rui Ma
In-depth profile control is a crucial technique employed to enhance oil recovery in fractured-vuggy carbonate reservoirs. However, it is a challenge to achieve in-depth profile control. In this paper, two types of organic gel systems, namely s-MPG and MSRG, tailored for fractured-vuggy reservoirs with 140 °C and 22 × 10 4 mg/L have been developed. FTIR was used to analyze the functional groups of s-MPG and MSRG. Additionally, the quality retention rates of s-MPG and MSRG were assessed using TG-DSC, yielding results of 92.85% and 92.65%, respectively. The dilution rates of s-MPG and MSRG are found to be 18.69% and 26.69%, respectively, demonstrating excellent compatibility and adaptability. The enhancement performance depends on the synergistic effect that the anti-dilution s-MPG effectively separates bottom water, while high-strength MSRG separates the oil layer. Moreover, the EOR performances of s-MPG synergy with MSRG in various types of fractured-vuggy carbonate models were also evaluated. The highest oil recovery of 12% is achieved in fracture network model. Laboratory results indicate that the synergistic combination of s-MPG and MSRG for water plugging in fractured-vuggy carbonate reservoirs results in a more effective enhancement of oil recovery compared to using a single gel system for plugging. Finally, the s-MPG synergy with MSRG has been applied in actual fractured-vuggy carbonate reservoirs. As expected, the water cut of typical well is reduced from 100% to 30% and the increased oil production is 1142 t totally. Therefore, this study presents a novel approach to achieving in-depth profile control by leveraging the synergistic effect of s-MPG with MSRG in fractured-vuggy carbonate reservoirs.
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高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Qiao Liu,Meirong Kang,Weiguo Fang,Hailong Liu,Zhiwei Huang
A novel quaternization reagent of (1E,1′E)-1,1′-(1,4-phenylene)bis(N-(3-(1H-imidazol-1-yl)propyl)methanimine) (PP) was synthesized and used for the preparation of a series of poly(ionic liquid)s (PILs) via the quaternization reaction. These PILs were subsequently loaded with polyoxometalates (POMs) to create innovative catalysts for the oxidation of alkenes. Comprehensive structural analysis of the catalysts showed that these PILs exhibited a high loading amount ratio of up to 542 % for POMs, which were well-dispersed on the surface of PILs. The PILs loaded POMs catalysts, especially for PW-PIL-TB-2PP with H 3 PW 12 O 40 as the POMs, displayed remarkable activity and stability in oxidizing cyclooctene, achieving a conversion rate of 97 % and a selectivity of 99 % for 1,2-epoxycyclooctane over six consecutive runs without notable loss. Furthermore, the PW-PIL-TB-2PP catalyst could also be used for the oxidation of a wide range of cyclic, linear, and aromatic alkenes.
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高影响因子
JOURNAL OF FOOD SCIENCE
·
2024
·
IF 3.2
Jianping Chen,Xuehua Chen,Anqi Tang,Zhuo Wang,Kit-Leong Cheong,Xiaofei Liu,Saiyi Zhong
This study aimed to evaluate the anti-cervical cancer activity of chondroitin sulfate–functionalized selenium nanoparticles (SeCS) and to elucidate their action mechanism. Cytotoxic effect of SeCS on HeLa cells was assessed by MTT assay. Further molecular mechanism of SeCS was analyzed by flow cytometric assay and western blotting. The results showed that treatment with SeCS resulted in a dose- and time-dependent inhibition in the proliferation of HeLa cells. The data obtained from flow cytometry demonstrated that SeCS inhibited HeLa cell growth via the induction of S-phase arrest and cell apoptosis. Further mechanism analysis found that SeCS down-regulated expression levels of cyclin A and CDK2 and up-regulated p21 expression, which contributed to S arrest. Moreover, SeCS increased the level of Bax and decreased the expression of Bcl-2, resulting in the release of cytochrome C from mitochondria and activating caspase-3/8/9 for caspase-dependent apoptosis. Meanwhile, intracellular reactive oxygen species (ROS) levels were elevated after SeCS treatment, suggesting that ROS might be upstream of SeCS-induced S-phase arrest and cell apoptosis. These data show that SeCS has anti-tumor effects and possesses the potential to become a new therapeutic agent or adjuvant therapy for cancer patients. Practical Application In our previous study, we used chondroitin sulfate to stabilize nano-selenium to obtain SeCS to improve the bioactivity and stability of nano-selenium. We found that it possessed an inhibitory effect on HeLa cells. However, the molecular mechanism remains unclear. This study elucidated the mechanism of SeCS damage to HeLa cells. SeCS has the potential to become a new therapeutic agent or adjuvant therapy for cancer patients.
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PubMed
高影响因子
Materials
·
2025
·Vol. 18
·期 11
·2477
·
IF 3.2
Wenjie Wang,Xuan Zhang,Xianchao Wang,Chengwei Gao,Jinling Yin,Qing Wen,Guiling Wang
Natural graphite (NG) is abundant and has a high capacity for lithium-ion storage, but its narrow interlayer spacing and poor cyclic stability limit its use in high-performance lithium-ion batteries (LIBs). To address this, a N/S co-doped micro-expanded graphite composite (BFAC@MEG) was prepared by coating micro-expanded graphite (MEG) with N/S-containing amorphous carbon derived from biochemical fulvic acid (BFAC). This enhanced the electrochemical kinetics of lithium ions, improving charge transfer rates and reducing diffusion resistance. GITT results showed a higher Li+diffusion coefficient than MEG and spherical graphite (SG). BFAC@MEG exhibited excellent rate performance, robust storage capacity and remarkable cycling stability. It had a specific capacity of 333 mAh g−1at 1 C, 205 mAh g−1at 3 C, and retained 81.57% capacity after 500 cycles. Even at 5 C, BFAC@MEG exhibits a high reversible capacity of 98 mAh g−1after 200 cycles. After cycling, SEM and XPS analyses revealed a low expansion rate of 15.96% cross-sectional expansion after 300 cycles at 3 C and a stable solid electrolyte interphase (SEI) film rich in LiF and Li2CO3.
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PubMed
高影响因子
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