JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Hong Tian,Yumin Li,Qingping Dai,Shunlang Wei,Zhibin Qiu,Wenzhong Wang
Cadmium sulfide (CdS), as a potential photoelectrochemical (PEC) photoanode candidate, generally exhibits unsatisfactory hydrogen generation because of the serious recombination of charge carriers and photocorrosion. In this work, a feasible p-n heterostructure CdS/AgVO 3 nanorod arrays (NRAs) photoanode was fabricated by modifying n-type CdS nanorod arrays with p-type AgVO 3 nanoparticles for enhancing PEC hydrogen evolution property of CdS NRAs photoanode. In this p-n heterostructure CdS/AgVO 3 nanorod arrays photoanode, AgVO 3 with narrower band gap not only distinctly heightens the visible light absorption ability of CdS, but also significantly integrates with CdS to establish charge transfer path at CdS and AgVO 3 interface. The built-in electric field of the p-n junction improves the separation and transfer efficiency of photogenerated electrons (e − ) and holes (h + ). The CdS/AgVO 3 NRAs photoanode achieves an evident hydrogen evolution rate of 165.05 μmol cm −2 h −1 , higher than that of bare CdS (121.85 μmol cm −2 h −1 ) NRAs photoanode. This work offers an effective scheme to fabricate photoanode for efficiently turning the solar energy into a green and clean energy.
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CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Jiaoyang Hao,Lin Tan,Jiaqi Xu,Xiaowei Ma
Metal organic frameworks (MOFs) derived materials have attracted a lot of attention in the field of electromagnetic wave (EMW) absorption. In this regard, we improved the EMW absorption performance of Ni-based MOF derived materials by introducing sulfur and nitrogen dual-doped graphene (N,S-GS), which possesses good electrical conductivity. The minimum reflection loss (RL min ) of Ni/C/N,S-GS can reach −51.4 dB at 10.1 GHz when the absorber thickness is only 2.43 mm, with an effective absorption bandwidth (EAB) of 3.04 GHz. This work provides us with a novel strategy for the synthesis of composites with high-performance microwave absorption for practical applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Sensen Yu,Jie Xu,Qingyong Wang,Yongjin Zou,Cuili Xiang,Fen Xu,Lixian Sun,Menghe Jiang,Zhicong Hu,Xuebu Hu
Slow water dissociation (the Volmer step) is the rate-limiting step in the alkaline hydrogen evolution reaction (HER), which limits the efficient industrial production of clean hydrogen. In this study, a novel hollow oxygen-rich vacancy polymetallic nitride , Co 2 NiMo-N, is proposed as a HER catalyst. The synergistic interaction between Co, Ni, and Mo promotes the Mo elemental activity and increases the conductivity of the material. The porous hollow structure exposes enough active sites to facilitate electron transfer . Numerous oxygen vacancies (O V s) reduced the Gibbs free energy (ΔG H* ) of H* adsorption and promoted the Volmer step, thus improving the electrocatalytic hydrogen evolution performance of the material. The Co 2 NiMo-N catalyst exhibited excellent HER activity with a low overpotential of 69 mV and a small Tafel slope of 77.58 mV dec −1 in 1 M KOH.
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CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Changqu Lin,Lulu Xu,Yue Zhuang,Peipei Ma,Hongli Wu,Haifeng Gan,Fei Cao,Ping Wei
The cleavage of C-C bonds to generate small molecules is a pivotal strategy for integrating shell bio-refinery products into the conventional chemical industry. Herein, we synthesized a novel bifunctional acetylacetone molybdenum-based catalyst with oxygen vacancies and acid sites (Ov-Mo-acac), which catalyze the retro -aldol reaction of N -acetylglucosamine (NAG), consequently the condensation with acetylacetone and dehydration to co-produce furan and pyrrole compounds. Reaction optimization resulted in a remarkable yield of 95 % for N-acetyl-3-acetyl-2-methyl pyrrole (AMAP) and 74 % for 5-(1,2-dihydroxyethyl)-2-methyl-3-acetylfuran (DMAF) from NAG at 90 ℃ for 3 h. XPS, EPR, and Raman confirmed the reduction of molybdenum from the Mo 6+ to Mo 5+ and Mo 4+ , and oxygen vacancies on the surface. Furthermore, the catalyst has Lewis and Brønsted acidic sites, as evidenced by py-FTIR and 1 H MAS NMR. The study offers a new approach to utilizing shellfishery waste and sheds the function of oxygen vacancies on Mo-based catalysts for the retro -aldol reaction of carbohydrates.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Qingtian Xu,Jierui Ye,Shuaibo Han,Yuebing Gao,Pan Chen,Siqun Wang,Qiang Wu,Qian Li
Renewable polymeric microcapsules hold promise for precisely controlled release of hydrophobic drugs (curcumin) in therapeutic treatment. However, there still remains challenges to stabilize the properties of microcapsules and to enhance encapsulation efficiencies of curcumin. By using an eco-friendly ternary deep eutectic solvent here, we successfully fabricated native cellulose nanofibrils, holocellulose nanofibrils, and lignocellulose nanofibrils containing both phytates and sulfate groups. In addition, a novel type of curcumin-loaded polymeric microcapsules with diameter of 10–20 μm were prepared by cellulose nanofibrils as stabilizing agents in Polylactide Pickering emulsion. The Pickering emulsions stabilized by P/N/S-containing cellulose nanofibrils, holocellulose nanofibrils, and lignocellulose nanofibrils are more stable than the unmodified cellulose nanofibrils-stabilized emulsion. The Pickering emulsion stabilized by 0.2 wt% P/N/S-containing lignocellulose nanofibrils exhibited the highest emulsion layer height and the zeta potential reached −39.74 ± 2.88 mV. Moreover, the highest encapsulation efficiency of curcumin can be up to 94.80%. Antimicrobial test revealed that curcumin in the polymeric microcapsules exhibited an excellent inhibitory effect on S. aureus and the antibacterial efficiency reached 98.66%. These results provided important information on the comparison of different cellulose nanofibrils-stabilized Pickering emulsions and the application of controlled release of curcumin incorporated polymeric microcapsules in drug delivery system.
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Molecular Catalysis
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2024
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IF 3.9
Yi He,Peng Bai,Shibo Yuan,Jiafa Chen,Yicheng Zhao,Yongdan Li
N -formylation of amines with CO 2 is a promising approach to high-efficient utilization of CO 2 as C1 feedstock, while conventional thermocatalytic processes suffer from harsh reaction condition and intense energy consumption. In this work, photocatalytic N -formylation of amines with CO 2 is achieved at room temperature over Pt-Bi/CeO 2− x composite catalyst. The Pt-Bi bimetallic sites increase the concentration of surface oxygen vacancies. Furthermore, the synergistic effects of Pt and Bi improve the light absorption capacity, reduce the band gap energy of the photocatalyst and promote the separation of photoinduced charge carriers. Using PhSiH 3 as the reducing agent, the conversion of N -methylaniline reaches 100 % after 3 h irradiation in N, N -dimethylformamide solvent with a N- methylformanilide selectivity of 90.8 %. The composite photocatalyst shows promising cycling stability and universality.
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MACROMOLECULES
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2024
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IF 5.1
Zhen Yu,Yanlin Liu,Sheng Wang,Yajin Fang,Xiangyu Zhou,Zhaobin Tang,Jin Zhu,Junping Zhang
Dynamic covalent adaptive networks can solve the recycling issue of thermosets. However, dissociative dynamic covalent networks may suffer from instability and network incompleteness at high temperatures or in solvents. Here, we report a novel dynamic covalent bond, N-sulfonyl guanidine urea (SGUA), that can undergo catalyst-free metathesis reactions, in which a passivation strategy of increasing the dissociation temperature of guanidine urea by introducing electron-withdrawing N-sulfonyl groups into adjacent positions was developed. Unlike conventional dissociative dynamic urea bonds, SGUAs exhibit associative metathesis reactions at around 120–180 °C, with a high dissociation threshold of 180 °C. The dynamic covalent polyurea constructed by SGUAs, named PSGUAs, exhibits ultrastrong (Young’s modulus exceeding 4 GPa and tensile strength exceeding 60 MPa) and stable (thermal stability, network structure integrity under reprocessing, and dimensional stability) performances. Furthermore, due to the excellent dynamic characteristics of SGUAs, PSGUAs were successfully reprocessed after 30–60 min of hot pressing at 160 °C and 20 MPa. Combining the long-lasting antibacterial properties of PSGUAs with long-term use, this study marks a substantial improvement in the field of dynamic polymer networks, giving a solution for balancing material stability, high performance, and reprocessability.
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CATALYSIS SURVEYS FROM ASIA
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2025
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IF 2.3
Zhu Mengxuan,Li Hongqing,Wang Xin,Wang Longyang,Wang Rui,Jiang Heng,Jin Changzi
Design of efficient metal-acid bifunction catalysts is of significance for development of hydroisomerization of linear alkanes. In this study, the spatial configurational construction of Pt-ZSM-5 catalytic system was achieved by fabrication of acidic ZSM-5 zeolite and mesoporous silica core-shell composites equipped with controlled location of Pt sites, which aim to explore the effect of functional sites proximity on isomerization reactivity. A series of characterization techniques such as X-ray diffraction, transmission electronic microscopy, N 2 physical adsorption, NH 3 temperature programmed desorption, X-ray photoelectron spectroscopy and so on had confirmed that the synthesized core-shell bifunctional catalysts with different Pt location possessing similar textural, acid and metal properties. In the catalytic hydroisomerization of n -heptane, however, the catalyst with Pt sites locating at acid zeolite exhibits superior n -heptane conversion and isomerization selectivity, which indicates that proximity of active sites at atomic scale may be more conducive to their synergistic effect when the diffusional limitation from zeolitic channel is minimized. These results had presented new direction for the preparation of efficient bifunctional catalysts in hydroisomerization of linear alkanes.
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Molecular Catalysis
·
2024
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IF 3.9
Pengcheng Wang,Qingqing Jiang,XingYu Li,Xuedong Wang,Juncheng Hu
Generally, researchers focus on the regulation of metal sites rather than surrounding nonmetals in photothermal CO 2 hydrogenation reaction. Herein, concerning the role of non-metallic N species, a series of Co/NC-T catalysts have been fabricated via high-temperature pyrolysis of Zeolitic Imidazolate Frameworks-67. The CO 2 conversion rate shows a consistent tendency with the ratio of graphitized-N species while the product selectivity is closely related to the coordination state of Co-N x species. Co/NC-800 catalyst achieves high CO 2 conversion rate of 758 mmol g cat -1 h -1 with CH 4 selectivity of 99.6 %. After adding extra graphitized-N species, the CO 2 conversion rate could further enhance to 80.2 % for N-Co/NC-2. The role of N species in photothermal CO 2 hydrogenation reaction has been investigated in details, providing new insights for the design of metal organic frameworks derived metal/N-doped carbon catalysts.
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Nanoscale
·
2024
·Vol. 16
·期 10
·5215-5221
·
IF 5.8
Yangdong Zhou,Junda Chen,Zhiyin Huang,Yuqin Peng,Lixin Xing,Chunmei Tang,Ning Wang,Ling Meng,Mingjie Wu,Lei Du,Siyu Ye
The cathodic oxygen reduction reaction (ORR) has been continuously attracting worldwide interest due to the increasing popularity of proton exchange membrane (PEM) fuel cells. So far, various Pt-group metal (PGM) or PGM-free catalysts have been developed to facilitate the ORR. However, there is still a gap to achieve the expected goals as proposed by the U.S. Department of Energy (DoE). Recently, PGM-free@PGM hybrid catalysts, such as the M/N/C@PtM catalyst, have achieved the milestones of oxygen reduction, as reviewed in our recent work. It is, nevertheless, still challenging to unravel the underlying structure–property relationships. Here, by applying different Pt/Co ratios, a series of Co/N/C@PtxCo catalysts are synthesized. Interestingly, the ORR activity and stability are not linear with the Pt content, but show a volcano-like curve with increased Pt usage. This relationship has been deeply unraveled to be closely related to the contents of pyrrolic N, pyridinic N, and graphitized carbon in catalysts. This work provides guidelines to rationally design the coupled PGM-free@PGM catalysts toward the ORR by appropriate surface engineering.
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BIOMASS & BIOENERGY
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2024
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IF 5.8
Chenglong Wen,Shuning Li,Peng Zhang,Mohong Lu,Jie Zhu,Mingshi Li,Chunshan Song
A series of Mo 2 N particles supported on nitrogen-doped carbon (Mo 2 N@NC) catalysts for guaiacol hydrodeoxygenation were synthesized in situ through a one-step method employing dopamine as C and N resources and ammonium molybdate as Mo resource, respectively. During synthesis, molybdate ions are adsorbed on dopamine because of a complexation between them; then dopamine/molybdate ions/TMB/F127 nanoemulsions are formed. After polymerization, growth, drying, and carbonization , Mo 2 N particles supported on nitrogen-doped carbon catalysts are obtained. Because of the interaction between Mo and N, Mo 2 N particles are anchored onto the support, preventing the aggregation of Mo 2 N during carbonization. As a result, ultrafine Mo 2 N particles with a size of 1.0–1.3 nm are highly dispersed on Mo 2 N@NC catalysts. The guaiacol hydrodeoxygenation for these Mo 2 N@NC catalysts was performed at 280–380 °C, a H 2 flow rate of 80 mL/min and different pressures and weight hourly space velocities. Among them, Mo 2 N@NC with a Mo 2 N loading of 40 % presents the highest guaiacol conversion (99.9 %) and aromatic hydrocarbon selectivity (80.2 %), which is also better than Mo 2 N/C with a Mo 2 N loading of 40 % prepared by the wet impregnation method.
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Animal Models and Experimental Medicine
·
2024
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IF 3.8
Xue Wang,Chunyou Ning,Xingyi Cheng,Zhengzhong Wu,Dongbo Wu,Xuemei Ding,Cunxiang Ju,Zhihang Zhou,Lingfeng Wan,Wei Zhao,Peiliang Shi
Background The emerging incidence of pathogenic liver conditions is turning into a major concern for global health. Induction of pyroptosis in hepatocytes instigates cellular disintegration, which in turn liberates substantial quantities of pro-inflammatory intracellular substances, thereby accelerating the advancement of liver fibrosis. Consequently, directing therapeutic efforts towards inhibiting pyroptosis could potentially serve as an innovative approach in managing inflammation related chronic hepatic disorders. Methods GSDMD-NT ki/wt mice and Alb-cre ki/wt mice were generated using CRISPR/Cas9 technology. After crossing the two strains together, we induced conditional cell death by doxycycline to construct a mouse model of liver fibrosis. We analyzed differentially expressed genes by RNA sequencing and explored their biological functions. The efficacy of obeticholic acid (OCA) in the treatment of liver fibrosis was assessed. Results Doxycycline-treated GSDMD-NT ki/wt × Alb-cre ki/wt mice showed severe liver damage, vacuolation of hepatocytes, increased collagen fibers, and accumulation of lipid droplets. The expression of liver fibrosis related genes was greatly increased in the doxycycline-treated mouse liver compared with untreated mouse liver. RNA-sequencing showed that upregulated differentially expressed genes were involved in inflammatory responses, cell activation, and metabolic processes. Treatment with OCA alleviated the liver fibrosis, with reduced ALT and AST levels seen in the GSDMD-NT ki/wt × Alb-cre ki/wt mice. Conclusions We successfully constructed a novel mouse model for liver fibrosis. This GSDMD-NT-induced fibrosis may be mediated by abnormal lipid metabolism. Our results demonstrated that we successfully constructed a mouse model of liver fibrosis, and GSDMD-NT induced fibrosis by mediating lipid metabolism.
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