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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Journal of Materials Chemistry B
·
2013
·Vol. 2
·期 6
·659-667
·
IF 0
Huihui Kuang,Hongyan He,Zhiyun Zhang,Yanxin Qi,Zhigang Xie,Xiabin Jing,Yubin Huang
Injectable and biodegradable supramolecular hydrogels were prepared by nucleobase (adenine/thymine)-terminated poly(ethylene oxide)s (A-PEG-A/T-PEG-T) and α-cyclodextrin (α-CD). The supramolecular hydrogels were thoroughly characterized by WXRD, rheometer, and SEM. The gelation time depended on the molecular weight of PEG and the concentration of polymer precursors. The rheological studies showed enhanced elastic modulus (G′) of hydrogels, because of the hydrogen-bonding between A and T acting as additional network junctions. In vitro evaluation showed that the supramolecular hydrogels have acceptable biocompatibility, and are suitable for sustained and controlled release of loaded antitumor drugs. Gel formation was also confirmed when the supramolecular hydrogels were subcutaneously injected into rats. In addition, in vivo experiments employing U14 cancer cell xenograft-bearing mice showed that the intratumoral injection of a DOX-loaded A-PEG-A/T-PEG-T/α-CD gel inhibited tumor growth more effectively than that of free DOX, DOX-loaded PEG/α-CD gel, saline or gel alone. Hence, such a simple and convenient anti-cancer drug delivery system of a A-PEG-A/T-PEG-T/α-CD supramolecular hydrogel would be a promising candidate for many biomedical applications, especially in the area of the chemotherapy of solid tumors.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jinlong Hu,Qingqing Chen,Qi Xia,Lingzhi Zhang
Heteroatom-doped hollow carbon nanostructures are one of the most promising sulfur hosts for high-performance lithium-sulfur (Li-S) batteries. However, finding a facile and controllable synthesis and enhancing their immobilization effect on polysulfides have been challenging. Herein, we propose a one-step in-situ reaction approach to synthesize N/F dual-doped hollow micro/mesoporous carbon nanospheres (NFHCs) as multifunctional sulfur host, which integrates the physical confinement of hollow porous structure and chemical adsorption/catalytic ability of N/F active sites to realize strong anchoring and accelerated conversion of polysulfides. This sulfur cathode based on NFHCs host with a high sulfur content of 80 wt% enables a superior high-rate capacity of 689 mAh g −1 at 3C, accompanied by outstanding cycle life over 500 cycles at 2C with a capacity decay of only 0.05% per cycle and nearly 100% Coulombic efficiency. This work opens up new horizons to design nanostructured functional hollow carbons for advanced Li-S batteries.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Liping Feng,Yunzhen Chang,Hua Song,Wenjing Hou,Yanping Li,Yun Zhao,Yaoming Xiao,Gaoyi Han
Introducing fast pseudo-capacitance is an effective strategy to improve the capacitive performances of carbon-based materials. Here, thiourea is used as nitrogen and sulfur source to dope resorcinol formaldehyde polymer. Besides the forming of copolymer of thiourea and resorcinol formaldehyde resin, the thiourea resin also acts as template to adjust the hierarchical microstructure. The N, S co-doped porous carbon exhibits specific surface area of 3599.0 m 2 g −1 and wide pore distribution. The specific capacitance of the optimized sample can reach 461.7 F g −1 in 6.0 mol L −1 KOH electrolyte at current density of 0.1 A g −1 , and still retains 337.5 F g −1 at current density of 10.0 A g −1 , indicting good rate capability. The assembled symmetric device exhibits the maximum energy density of 14.9 Wh kg −1 at the power density of 61.9 W kg −1 based on the active materials. The capacitance can retain 98.3 % of the initial capacitance after 10,000 cycles at current of 10.0 A g −1 . Using organic electrolyte, the operating voltage can be extended to 2.1 V, so the energy density of the device reaches 38.3 Wh kg −1 at 262.5 W kg −1 . This co-doped strategy provides an effective approach to prepared carbon-based materials with high capacitive performance.
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LIVER INTERNATIONAL
·
2025
·Vol. 45
·期 3
·e70024
·
IF 5.2
Guqing Luo,Zhenghao Wu,Qiang Fan,Chihao Zhang,Jiayun Lin,Hongjie Li,Jinbo Zhao,Haizhong Huo,Xiaoliang Qi,Guangbo Wu,Min Chen,Jiwei Yu,Lei Zheng,Meng Luo
Background and Aims Lymphangiogenesis is enhanced during the development of liver cirrhosis and portal hypertension (PHT). However, hepatic lymphatic vascular system is understudied in liver cirrhosis and PHT. Hydrogen sulfide (H 2 S) and related compounds have potential prolymphangiogenic effects besides its previously reported vascular-protective effects. Therefore, we aimed to investigate the effects of endogenous H 2 S donor S-allyl-cysteine (SAC) on bile duct ligation (BDL)-induced liver cirrhosis and PHT. Methods BDL rats with cholestatic liver cirrhosis and PHT were orally administrated with SAC at 100 or 200 mg/kg/day, as well as DL-propargylglycine (PAG) or MAZ-51 injections. Hemodynamic parameters were determined, and subsequent evaluations of liver fibrosis, intrahepatic vascular resistance (IHVR) and lymphangiogensis were performed. Human lymphatic endothelial cells (hLECs) were used for in vitro verification of prolymphangiogenic effects of SAC. Results SAC treatment significantly decreased PP and promoted endogenous H 2 S production. Liver fibrosis and IHVR were also ameliorated. Hepatic and mesenteric lymphangiogenesis were enhanced in BDL rats and further promoted by SAC despite a significant downregulation of hepatic VEGF-C. Inhibition of H 2 S production by PAG significantly reduced lymphatic vessels, while inhibition of lymphangiogensis by MAZ-51 reversed the protective effects of SAC against PHT. SAC enhanced lymphangiogenic functions in vitro by promoting cellular H 2 S production and activating Akt phosphorylation without altering VEGF-C/D, which were reversed by PAG and MAZ-51. Conclusions SAC significantly alleviated BDL-induced liver cirrhosis and PHT. Meanwhile, elevated H 2 S induced by SAC facilitated lymphangiogenesis via a VEGF-C-independent manner, which contributed to the alleviation of PHT.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Ke Liu,Shidong Liu,Qin Shuai,Lijin Huang
Mercury (Hg(Ⅱ)) is an extremely hazardous heavy metal ubiquitously discovered in the global environment. Covalent organic polymers (COPs) have been recognized as promising adsorbents due to their exceptional properties tailored for Hg(II) sequestration. Nevertheless, the synthesis of the majority of COPs requires rigorous experimental conditions. Herein, a sulfur (S)-rich COP denoted as TpTU was successfully constructed using a solvent-free approach. Compared to TpUrea without S, TpTU exhibited superior Hg(Ⅱ) capture performance. The experimental results demonstrated splendid adsorption performance for Hg(Ⅱ) (187 mg·g −1 ), and the adsorption isotherm was well-fitted to the Freundlich model (R 2 > 0.98). Meanwhile, adsorption equilibrium was achieved within 5 min, and thermodynamic analyses indicate that the adsorption process is endothermic in nature. In addition, TpTU exhibited exceptional selectivity for Hg(II) even in the presence of competing ions. The mechanism investment revealed that the incorporation of heteroatoms, particularly S and nitrogen (N), plays a critical role in enhancing the affinity of COP toward Hg(Ⅱ). Moreover, no significant loss is observed for its capacity even after eighth adsorption–desorption cycles, demonstrating remarkable reusability of TpTU. Furthermore, TpTU also achieved Hg(Ⅱ) removal efficiency of over 98.9 % in actual water samples. These results prove the practical potential of TpTU for the purification of Hg(II) polluted water, offering a promising avenue towards cleaner and safer water resources.
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Small
·
2024
·Vol. 20
·期 38
·2402466
·
IF 13
Yibin Ren,Jianbo Li,Yi Zhang,Yunhui Huang,Zhen Li
Aqueous Zinc–sulfur (Zn–S) batteries are promising for the field of energy storage due to their low cost, high theoretical capacity, and safety. However, the large volume expansion and the inherently poor conductivity of sulfur would result in electrode cracking and sluggish reaction kinetics, limiting the practical application of Zn–S batteries. Herein, commercial zinc sulfide (ZnS) is employed instead of S as cathode and proposed a doping modification strategy to solve the above problems. The designed ZnS 0.93 Se 0.07 cathode shows good cycle stability and much-improved reaction kinetics, which is due to the smaller bandgap of ZnS 0.93 Se 0.07 (1.40 eV) compared to ZnS (1.86 eV). As a result, the obtained ZnS 0.93 Se 0.07 cathode exhibits a high specific capacity of 552 mAh g −1 (1672.6 mAh g −1 based on S) at 0.1 A g −1 and 330 mAh g −1 (1000 mAh g −1 based on S) at 2 A g −1 . Moreover, the ZnS 0.93 Se 0.07 cathode can provide a high areal capacity of 3.8 mAh cm −2 at a high mass loading of 10 mg cm −2 and limited electrolyte (4 µL mg −1 ). This work provides a simple and effective cathode modification strategy, which is conducive to promoting the practical application of Zn–S batteries.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Shiwei Ge,Qian Zhao,Yaoyang Liu,Fangfang Wang,Guijuan Wei,Yu Liu,Bin Xu
Lithium–sulfur (Li–S) batteries are considered as promising energy storage systems due to the high energy density of 2600 W h kg–1. However, the practical application of Li–S batteries is hindered by the inadequate conductivity of sulfur and Li2S, as well as the shuttle effect caused by polysulfides during the charge–discharge process. Introducing a conductive interlayer between the cathode and the separator to physically resist polysulfides represents an effective and straightforward approach to mitigate the shuttle effect in Li–S batteries. In this paper, an ultrathin (<1 μm) 2D–2D MXene-LDH interlayer with high polysulfide adsorption ability was introduced to Li–S batteries. The synergistic effect between MXene and layered double hydroxide greatly improved the adsorption effect of the interlayers: the conductive Ti3C2Tx MXene chemically adsorbs polysulfides and promotes their fast transfer, and the NiCo-LDH alleviates the restack of MXene and facilitates Li+ diffusion. After inserting the MXene-LDH interlayer, the Li–S batteries exhibit an enhanced specific capacity of 1137.6 mA h g–1 at 0.1 C and retain 622.6 mA h g–1 after 100 cycles. The ultrathin 2D–2D interlayer offers a feasible way for the development of highly efficient and lightweight interlayers in Li–S batteries.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Congcong Wang,Boya Liu,Guorong Wang,Zhiliang Jin
The fabrication of an S-scheme heterojunction represents a highly effective approach for achieving efficient and environmentally friendly artificial photosynthesis. In this study, a highly efficient S-scheme heterojunction was developed by modifying ZnIn 2 S 4 , a kind of chrysanumi-like flower, with a two-dimensional sheet of AgCoO 2 by physical grinding method, which realized H 2 generation and H 2 O 2 generation under visible light conditions. AgCoO 2 exhibits significant potential as a cocatalyst owing to its narrow band gap, black appearance, and robust stability. Because of the difference in Fermi levels, the two-dimensional AgCoO 2 and three-dimensional ZnIn 2 S 4 are closely fitted to accelerate the charge migration between the interfaces, thus improving the photocatalytic properties of the materials. In-depth investigations utilizing in situ X-ray photoelectron spectroscopy alongside additional experimental methodologies have definitively illuminated the intricate charge partition and migration dynamics operative within the S-scheme heterojunction interface between the two catalysts. Photochemistry and photoluminescence spectroscopy further confirmed that the formation of heterojunction accelerated the migration of photogenerated charge carriers, and electron spin resonance provided further evidence for the active substances in the reaction. This study has made additional advancements in the development of efficient S-scheme heterojunction materials for driving photocatalytic water cleavage.
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MOLECULES
·
2024
·Vol. 29
·期 8
·1833
·
IF 4.2
Chen Cheng,Hanyan Wu,Xinyang Chen,Shuiping Cai,Yingkang Tian,Xiaofei Yang,Xuejie Gao
Lithium–sulfur (Li-S) batteries have received much attention due to their high energy density and low price. In recent years, alleviating the volume expansion and suppressing the shuttle effect during the charge and discharge processes of Li-S batteries have been widely addressed. However, the slow conversion kinetics from polysulfide (LiPSs) to Li2S2/Li2S still limits the application of Li-S batteries. Therefore, we designed a ZIF-67 grown on cellulose (named ZIF-67@CL) as an electrocatalyst to improve the interconversion kinetics from LiPSs to Li2S2/Li2S for Li-S batteries. Based on the results of adsorption experiments of LiPSs, ZIF-67@CL and CL hosts were immersed in Li2S4solution to adsorb LiPSs, and the UV-Vis test was conducted on the supernatant after adsorption. The results showed that the ZIF-67@CL had a stronger adsorption for LiPSs compared with the cellulose (CL). Furthermore, in the Li2S nucleation tests, the fabricated cells were galvanostatically discharged to 2.06 V at 0.112 mA and then potentiostatically discharged at 2.05 V. Based on the results of Li2S nucleation tests, the catalytic effect of ZIF-67 was further verified. As a result, the sulfur cathode used a ZIF-67 catalyst (named S/ZIF-67@CL) and delivered an initial capacity of 1346 mAh g−1at a current density of 0.2 C. Even at a high current density of 2 C, it exhibited a high-capacity performance of 1087 mAh g−1on the first cycle and maintained a capacity output of 462 mAh g−1after 150 cycles, with a Coulombic efficiency of over 99.82%.
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Nanoscale
·
2025
·Vol. 17
·期 5
·2820-2829
·
IF 5.1
Yiling Ran,Rong Gan,Qin Zhao,Quanlei Ma,Yijing Liao,Yinwei Li,Yi Wang,Yanwei Wang,Yan Zhang
Engineering the local electronic structure of single atom catalysts (SACs) still remains challenging. In this study, a Ru-NiS2 single atom catalyst with a controlled S coordination environment, where Ru single atoms are implanted on a NiS2 nanoflower consisting of plenty of cross-linked nanosheets, has been developed via a facile atom capture strategy. Using Density Functional Theory (DFT) calculations, it has been revealed that the fine-tuned local S coordination environment can optimize the electronic structure of Ru active sites, and reduce the energy barrier of the rate-determining step for the oxygen evolution reaction (OER), thus boosting the electrocatalytic activity, such as a low overpotential of 269 mV at 10 mA cm−2. This work provides new insights into the rational regulation of the local coordination environment for SACs.
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高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Zhenyu Liu,Min Luo,Yue Cao,Linghu Meng,Yang Yang,Xiaoman Li
Doping elements in photocatalysts is a reliable strategy for efficiently utilizing solar energy. Herein, we reported the successful synthesis of S-doped Bi 2 MoO 6 (S-BMO) through a facile one-step solvothermal method utilizing Na 2 S as a sulphur source. By systematically adjusting the doping concentration of S 2- ion, it was found that when the optimal doping amount of Na 2 S was 0.7 %, the obtained photocatalyst showed a photocatalytic nitrogen fixation rate of 122.14 μmol·h −1 ·g cat -1 under visible light irradiation for 1 h, which was 3.67 times better than Bi 2 MoO 6 (BMO). Density Functional Theory (DFT) calculations demonstrated that S partially substituted O in Bi-O-Mo in S-BMO and also modulated the electronic structure of BMO. The photoreduction ability was enhanced due to the upshift of the conduction band (CB) energy level from −0.6 to −0.72 eV after S doping. This work may provide a promising method for efficient photocatalytic nitrogen fixation by doping BMO with non-metallic elements.
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