Nanoscale
·
2025
·
IF 5.1
Chuangxin Zhou,Zhiheng Zhang,Yuan Gao,Weize Diao,Siyi Zou,Jun Zhu,Jiangtao Xu,Guozhen Liu
Surface modification of Eutectic Gallium Indium (EGaIn) to inhibit oxidation has been a long-lasting challenge in material science, with limited research reporting the formation of a covalent bond between Ga and modifiers for stability purposes. Taking advantage of strong reductive property of EGaIn, this study developed a simple method for spontaneous reduction of aryldiazonium salts on EGaIn nanoparticle surface to form stable covalent Ga-C sigma bonds, effectively suppressing surface oxidation.Comprehensive characterization confirmed the formation of the covalent Ga-C bond rather than Ga-N=N-C bonds on the EGaIn nanoparticle surface. Approximately 20% of Ga(0) in EGaIn forms Ga-C bonds. Notably, the short chain aryl modified EGaIn nanoparticles exhibited high stability and negligible surface oxidation. This straightforward strategy for preparing stable aryl modified EGaIn nanoparticles allows the introduction of a range of ligands on the EGaIn nanoparticle surfaces, offering promising opportunities for diverse applications across multiple fields.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Sinian Jiang,Bin Zhang,Xinyu Liu,Jingchun Cao,JunJie Ge,Kexin Men,Yuxiong Jiang,Xiaocong Wang
As a promising anode for lithium-ion batteries (LIBs), silicon (Si) has been studied due to its high specific capacity. However, significant volume change during charge-discharge process has seriously impeded its practical application. Compounding with carbon is one of the methods to solve this problem. In this paper, biomass carbon is prepared by high temperature carbonization of Chinese rose petals. Different mass ratios of Si nanoparticles are embedded in the biomass carbon to produce C@Si composites. The as-prepared C@Si composites are assembled into LIBs to investigate their electrochemical performance. As an anode material for LIBs, the manufactured C@Si composite material (Si-25 wt%) manifests a stable cycling performance (524 mAh•g −1 at 0.1 A•g −1 after 100 cycles), a long cycle life (581 mAh•g −1 at 1 A•g −1 after 400 cycles) and excellent rate capability. And its initial coulombic efficiency at the current density of 1 A•g −1 (99.62 %) is much larger than that of pure nano-Si (29.45 %). The electrochemical impedance spectroscopy (EIS) results indicate that the C@Si composite materials can behave as an ideal capacitor. This study reveals the possibility of changing flower petals to carbon material and the potential applications in the field of LIBs.
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Crystals
·
2024
·Vol. 14
·期 3
·279
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IF 2.4
Yang Wu,Hao Lan,Xiaoming Sun,Zihao Hu,Yonghui Sun,Huifeng Zhang,Chuanbing Huang,Weigang Zhang
HfO2has become a promising thermal barrier coating material due to its similarity in structure and chemical properties with ZrO2and its higher phase structure transition temperature. However, the fracture toughness of HfO2is not ideal, greatly limiting its application. In this report, we find a special sandwich structure of ceramics, comprising a cubic (C) phase /monoclinic (M) phase/cubic (C) phase. The microstructural evolution and mechanical properties of these ceramics were investigated under annealing at 1500 °C. The results indicate that, with an increase in annealing duration, there was a gradual augmentation in the proportion of the monoclinic (M) phase and the fracture toughness increased from 2.18 MPa·m0.5to 2.83 MPa·m0.5after 48 h of annealing, which is higher than many potential TBC materials. The residual compressive stress present in the M phases during the progression of crack propagation served to facilitate the bridging and deflection of cracks. As such, this process led to the alleviation of stress concentration at the crack tip, ultimately enhancing the toughening effect.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Mengjia Song,Liwen Yan,Yifan Li,Junpeng Jiang,Zihan Gong,Anran Guo,Haiyan Du,Jiachen Liu
Integration of thermal insulation and electromagnetic wave absorption was crucial in stealth technology and hypersonic vehicles but challenging. Herein, silicon carbide nanofibers were synthesized by in situ chemical vapor deposition within a carbon foam skeleton to form a wave absorbing and heat insulating integrated composite aerogel with a hierarchical porous structure. The unique hierarchical porous structure provided an excellent platform for the absorption of electromagnetic waves, achieving a minimum reflection loss (RL min ) of −51.46 dB at 17.20 GHz. Meanwhile, the C/SiC nanofiber aerogel maintained a low density of 0.013 g/cm 3 , an ultra-low thermal conductivity of 0.030 W/(m⋅K) and a high thermal stability up to 1000 °C. Furthermore, to enhance the electromagnetic wave (EMW) absorption property of the aerogel, polypyrrole (PPy) was coated on the surface of C/SiC nanofiber aerogel by facile impregnation and chemical polymerization. The multiple conductor-semiconductor-conductor structure of C/SiC-PPy composite aerogel leads to various EMW loss mechanisms and excellent impedance match, resulting in an outstanding EMW absorption performance, with a RL min of −60.31 dB at 2.96 GHz.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Yulei Zhang,Zhaolin Huang,Wenli Zhang,Dawei Ni,Wei Xu,Cuie Guang,Wanmeng Mu
The presence of macrolides in food and the environment poses a substantial threat to the sustainable development of natural ecosystems and presents risks to human health. Previous research has demonstrated that microbial esterases can degrade erythromycin (Ery), roxithromycin (Rox), and clarithromycin (Clr), rendering them candidates for bioremediation of macrolide residues. However, the efficacy of esterases is limited by insufficient thermal stability, restricting their widespread application. To address this challenge, this study employed a combinatorial strategy integrating computational molecular dynamics (MD) simulations, server-assisted virtual mutation prediction, and a greedy algorithm for protein engineering to enhance the thermal stability of esterase C from Enterobacter hormaechei ( Ehno -EreC). After four rounds of screening, we successfully obtained a four-point mutant, M4 (D245P/S141A/D154I/T292W), which exhibited significantly improved thermal stability compared to the wild-type enzyme. Notably, the M4 mutant not only extended the enzyme's half-life at 40 °C from 7 to 1095 min, but also increased its degradation activity against Ery, Rox, and Clr. Structural analyses revealed enhanced rigidity in the loop between the major and minor lobes and the strengthened hydrophobic interactions post-mutation, contributing to the enzyme's structural stability. This finding was consistent with the observed reduction in correlated and anti-correlated motions in the MD trajectory.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2024
·
IF 1.5
Wang Xuebin,Mao Guoshu,Yu Shengjie,Fu Zhihai,Yue Yuanzhen,Zhang Shengdong,Ding Youqian,Huang Kun,Zhang Xian,Sun Xiaoyi
Responding to the need for radioactive waste disposal, the static and dynamic adsorption of Eu 3+ on TODGA-C resin in HNO 3 was investigated. The findings indicated that the adsorption of Eu 3+ on TODGA-C adheres to the quasi-second-order kinetic model. Additionally, the distribution coefficient for Eu 3+ adsorption on TODGA-C reaches 10 5 mL/g in 4 mol/L HNO 3 . Under the conditions of 3.5 mol/L HNO 3 , a flow rate of 3.6 mL/min, and an initial Eu 3+ concentration of 10 mg/L, the Thomas rate constant was found to be 1.2 mL/(mg·min), with a dynamic saturation capacity of 15 mg/mL.
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iScience
·
2024
·
IF 4.6
Binxia Yuan,Yuhao Liu,Hong Qian,Rui Zhu,Chengxi Zhang,Weiling Luan
In this study, the theoretical calculations proves that the combination of oxygen vacancy and amorphous carbon films in TiO 2 (V O -CT) can effectively reduce the energy bandgap and work function. The minimum Gibbs free energies required for the CO 2 RR reaction of V O -CT are 0.20 eV, which is lower than pure TiO 2 . The amorphous c@TiO 2 nanomaterials with oxygen vacancy and mesoporous structures (V O -MCT) are prepared with the P123 surfactant as the template and oxalic acid as an inducer. The electron paramagnetic resonance indicates the presence of abundant oxygen vacancy defects in the samples. UV-vis spectra indicate that the mesoporous structure enhances light absorption capacity. The photocatalytic CO 2 reduction tests show that the highest conversion rates for CH 4 and CO of V O -MCT are 14 μmol g −1 h −1 and 10.66 μmol g −1 h −1 , respectively. The electron consumption rate of V O -MCT is 12.43 times higher than that of commercial TiO 2 (P200).
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Liming Guo,Xin Wan,Jieyuan Liu,Xu Guo,Xiaofang Liu,Jiaxiang Shang,Ronghai Yu,Jianglan Shui
Synergistic effects have been applied to a variety of hybrid electrocatalysts to improve their activity and selectivity. Understanding the synergistic mechanism is crucial for the rational design of these types of catalysts. Here, we synthesize a MnCo2O4/Co–N–C hybrid electrocatalyst for the oxygen reduction reaction (ORR) and systematically investigate the synergy between MnCo2O4 nanoparticles and Co–N–C support. Theoretical simulations reveal that the synergy is closely related to the distance between active sites. For a pair of remote active sites, the ORR proceeds through the known 2e- + 2e- relay catalysis while the direct 4e– ORR occurs on a pair of adjacent active sites. Therefore, the formation of the undesired byproduct (H2O2) is inhibited at the interface region between MnCo2O4 and Co–N–C. This synergistic effect is further verified on an anion-exchange membrane fuel cell. The findings deepen the understanding of synergistic catalysis and will provide guidance for the rational design of hybrid electrocatalysts.
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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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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhi-Yuan Zheng,Zhi-Feng Jiao,Ji-Xiao Zhao,Xin-Chao Liu,Cai-Dong Song,Jia-Hang Li,Xiang-Yun Guo
In the hydrogenation of polyfunctional compounds, achieving high selectivity for specific functional groups remains challenging. Herein we report that SiC quantum dots (QDs) can selectively adsorb C = O in cinnamaldehyde, significantly increasing the activity and selectivity of Pt/SiC for hydrogenating cinnamaldehyde to cinnamyl alcohol. A 10 wt% QDs-modified Pt/SiC catalyst showed a turnover frequency 3.5 times higher than Pt/SiC under mild conditions. Further studies reveal that the defect-rich surface of SiC QDs facilitates the adsorption of C = O bond in cinnamaldehyde and enhances the spillover of active hydrogen from Pt to SiC QDs. During the catalysis process, Pt is responsible for the generation of reactive hydrogen species while the QDs undertake the activation of C = O bond, and the hydrogen species react with cinnamaldehyde via spillover. This work demonstrates the promise of SiC QDs in heterogeneous catalysis and provides a reference for designing novel hydrogenation catalysts.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Xiang Zou,Haitong Tang,Junzhi Li,Guichen Gao,Zhibing Geng,Liping Li,Guangshe Li
The electronic structure of molybdenum carbide closely resembles that of Pt, making it a promising candidate material for replacing noble metal catalysts . However, the primary challenge is the controlled and eco-friendly synthesis of molybdenum carbide. Herein, we developed a sustainable and controlled method for synthesizing a heterostructure catalyst for the electrocatalytic hydrogen evolution reaction (HER) using starch as the raw material. Through a hydrothermal redox reaction and subsequent temperature-programmed treatment under an inert atmosphere , the hexagonal Mo 2 C-cubic MoC heterostructure nanoparticles were dispersed on a carbon matrix. Our investigation into the synthesis process extensively covered the growth of MoO 2 nanocrystals and hydrochar during the hydrothermal redox reaction , as well as the phase evolution during the subsequent temperature-programmed treatment. Electrochemical assessments demonstrated the catalyst's remarkable efficiency for the hydrogen evolution reaction across both acidic and alkaline media, achieving a current density of 10 mA/cm 2 with an overpotential of 139.4 mV in 1 M KOH solution and 160.7 mV in 0.5 M H 2 SO 4 solution. Combining a series of electrochemical characterizations and applying the distribution of relaxation times (DRT) analysis to operando electrochemical impedance spectroscopy (EIS) data, the superior kinetic performance of the Mo 2 C–MoC/C was demonstrated, outperforming that of single-phase molybdenum carbide. Furthermore, the catalyst has demonstrated remarkable stability even at high current densities in both acidic and alkaline electrolytes , underscoring its potential as a cathode catalyst in both alkaline water electrolyzers and proton exchange membrane (PEM) electrolyzers.
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Energy Storage Materials
·
2024
·
IF 18.9
Shengkai Mo,Hanwen An,Qingsong Liu,Jiaming Zhu,Chuankai Fu,Yajie Song,Jiajun Wang
The practical application of solid-state batteries (SSBs) has been significantly hampered by the sluggish Li + transport dynamics in cold climates. In particular, SSBs suffer from insufficient dynamics due to poor electrolyte-electrode interface compatibility at low temperatures. Herein, a multistage bridge engineering for electrolyte and interface is proposed to improve the Li + transfer kinetics, which enables quasi-solid batteries to operate at low temperatures. The incorporation of siloxane segments allows the electrolyte to polymerise uniformly and improves Li + transport. The multistage bridging structure improves the electrode-electrolyte interfacial interaction, accelerating Li + transfer kinetics at low temperatures. The obtained Li||LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cell delivers a high coulombic efficiency of 99.98 % and a specific energy of 266 Wh⋅kg −1 at -40 °C. This multistage bridge engineering strategy provides a new perspective for polymer electrolyte design towards stable operation of quasi-solid batteries at low temperatures.
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