JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
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IF 10.319
B. Li,H.J. Li,X.Y. Yao,X.F. Tian,Y.J. Jia,G.H. Feng
A (ZrC/SiC) 3 alternate coating was deposited on sharp leading edge (SLE) C/C composites by chemical vapor deposition (CVD). The ablation behavior was examined via oxyacetylene torch with heat flux of 2.38 MW/m 2 . The results indicated that the alternate coating exhibited great ablation resistance, providing an effective protection for C/C composites. In initial rapid heating stage, the (ZrC/SiC) 3 alternate coating can relieve thermal stress, avoiding the peeling of coating and keeping an intact coating structure. In subsequent ablation, the SiC layers in central region were consumed rapidly, leaving layered interspaces. Three stacked ZrO 2 layers were reserved with the assistance of the release of thermal stress by interspaces, offering a great anti-scouring effect. In transition and border regions, the alternate SiC layers can delay oxygen erosion of inner coating and C/C substrate by the formation of SiO 2 . It is believed that the results would be helpful for the design and application of anti-ablation coatings on SLE C/C composites.
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GREEN CHEMISTRY
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2025
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IF 9.2
Zupeng Chen,Yongqi Zhuang,Yuguo Dong,Yanmei Zheng,Wenjun Zhang,Lin Dong
Lignin, the most abundant natural aromatic polymer on Earth, offers a promising feedstock for the production of value-added aromatic products through selective C-C bond cleavage. However, achieving both high product yield and selectivity under mild conditions, such as under visible-light irradiation, remains a significant challenge. In this study, we address this issue by employing ceria (CeO2) as a support to precisely engineer the dispersion of vanadium oxide through two distinct catalyst pretreatment methods: impregnation–calcination (Im-V/CeO2) and physical mixing–calcination (Pm-V/CeO2). The results demonstrate that the Im-V/CeO2 catalyst exhibits superior performance, converting 1,2-diphenylethanol to benzaldehyde with an impressive 89% yield and 98% selectivity, while CeO2 alone yields 52% and Pm-V/CeO2 yields 45%. This enhanced performance of Im-V/CeO2 is attributed to the introduction of low-polymerized vanadium oxide (VOx) species. Unlike highly polymeric V2O5 crystals, these species facilitate the separation of photogenerated electron-hole pairs and reduce charge transfer resistance, thereby improving photocatalytic efficiency. Additionally, the polar nature of VOx species enhances the activation of lattice oxygen, creating more sites for oxygen adsorption and activation. In-depth mechanistic studies reveal that superoxide radicals play a dominant role in the C-C bond cleavage process. This innovative strategy for achieving high-efficiency photocatalytic C-C bond cleavage through the controlled dispersion of vanadium oxide on a cerium oxide support offers valuable insights for the sustainable valorization of lignin.
研究领域:
催化
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材料科学
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光催化
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可持续化学
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木质素高值化
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JOURNAL OF ETHNOPHARMACOLOGY
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2025
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IF 5.4
Xin-Yao Li,Bang-Yin Tan,Yue Zhang,Yan-Lin Lv,Yun-Li Zhao,Xiao-Dong Luo
Ethnopharmacological relevance Stemona sessilifolia (Miq.) Miq. has been employed in traditional medicine for its potential renal benefits, including anti-edema, diuretic, and anti-jaundice properties. However, the renoprotective effects related to these traditional uses remain to be fully elucidated. Aim of the study : To investigate the therapeutic efficacy of S . sessilifolia against hyperuricemic nephropathy and elucidate its underlying signaling pathway. Materials and methods A hyperuricemic nephropathy mouse model, induced by potassium oxonate and hypoxanthine, was employed to evaluate the renal protection of the extract of S. sessilifolia through biochemical tests and histopathological observation. Transcriptomic analysis was applied to explore potential signaling pathways. Subsequently, bioassay-guided isolation was conducted during phytochemical investigation. Uric acid-induced HK-2 cells were then employed to validate the renal cytoprotective effects of the isolated compounds. Results Treatment with S. sessilifolia extract significantly reduced serum uric acid, creatinine, and urea nitrogen levels by 65.15%, 47.95%, and 49.1%, respectively. Additionally, it decreased urinary protein excretion, and ameliorated renal injury and fibrosis in mice. The protective effects might be exerted by inhibiting the c-Myc/c-Fos/MAPK signaling pathway to maintain the homeostasis of renal tissue. Moreover, the bioactive compound stemoninine protected HK-2 cells against uric acid-induced oxidative stress, inflammatory response, proliferation, migration, and apoptosis. Conclusion The S. sessilifolia extract and its major bioactive compound, stemoninine, protected against hyperuricemic nephropathy by suppressing the c-Myc/c-Fos/MAPK signaling pathway.
研究领域:
民族药理学
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肾病学
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植物化学
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分子生物学
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信号转导
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高影响因子
Materials Research Express
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2025
·Vol. 12
·期 9
·095005
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IF 2.2
Xinfa Qiang,Xiangyu Chen,Maoheng Dong,Zi Yang,Wensu Meng,Hai Kan,Keqing Wang,Lijin Wang,Ling Wang,Chao Wu
A unique bead-chain-like SiC nanowires (SiCnws) morphology was successfully synthesized via an aerogel carbothermal reduction method. Microstructural analysis revealed that the SiC chain display diameters ranging from 100 to 200 nm, while the SiO2 bead exceed 1 μm in diameter. A SiCnws reinforced CrSi2-SiC/SiC coating was prepared on C/C composites by a two-step pack cementation. Comparative analysis revealed that SiCnws-reinforced coating exhibited better densification with lesser cracks and pores. Isothermal oxidation tests at 1773 K in static air demonstrated exceptional performance: the SiCnws-reinforced coating showed only 14.98% mass loss after 30 h, while the unreinforced coating suffered 36.53% mass loss after 14 h. XRD/SEM characterization confirmed that SiCnws enhanced structural integrity by promoting the formation of a continuous SiO2-Cr2O3 glassy layer during oxidation, while mitigating crack propagation through pinning and bridging effects.
研究领域:
材料科学
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陶瓷涂层
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高温氧化
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纳米材料
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复合材料
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Green Energy & Environment
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2025
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IF 14.6
Ruifeng Wang,Yuchang Liu,Yandong Li,Yafen Kong,Qizhi Chen,Shuangliang Zhao
Efficiency of C-C bond coupling in highly inert CO 2 is relatively low, which severely limits its efficient conversion to acetate. Here, we successfully developed a highly stable NF@CoMn 2 O 4 @Cu 2 O-Ag bimetallic active site catalyst by anchoring Ag on the Cu 2 O surface. In this catalyst, the Co 3+ /Mn 3+ -Mn 4+ removes excess electrons from the Cu + sites via strong electronic interactions, preventing the reduction of Cu 2 O to metallic Cu 0 , which ensures the NF@CoMn 2 O 4 @Cu 2 O-Ag exhibits a high resistance to deactivation. The Cu + active sites of NF@CoMn 2 O 4 @Cu 2 O-Ag efficiently electroreduce CO 2 to the *CO atop intermediate, while the Ag active sites efficiently electroreduce CO 2 to the *CO bridge intermediate. The proximity of Cu + /Ag bimetallic sites shortens the distance for C-C bond coupling between the *CO atop and *CO bridge intermediates, facilitating the efficient electrocatalytic coupling of CO 2 to synthesize acetate. DFT analysis indicates that the ΔG required for C-C bond coupling on the short-distance Cu + /Ag bimetallic sites of NF@CoMn 2 O 4 @Cu 2 O-Ag is significantly lower than that of NF@CoMn 2 O 4 @Cu 2 O, enabling a high Faradaic efficiency of 64.97% for acetate production at -0.3 V vs. RHE. This study provides an effective strategy for the rational design of synergistic catalysis between heterometallic catalytic sites to efficiently achieve C-C coupling for the synthesis of C 2+ products.
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Energy Storage Materials
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2023
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IF 20.4
Chengyao Zhao,Yiming Lin,Qiaoyan Lin,Qi Liu,Yujing Liu,Zhongqiu Liu,Anguo Ying
Aqueous zinc-ion hybrid capacitors (ZIHCs) are a promising new type of energy storage device, but there is a plight that the unsatisfactory Zn 2+ storage capability of carbonaceous cathodes limits further application. To address this issue, desolvation strategy is employed to tailor the solvation sheath of Zn 2+ in the ultra-micropores (0.59 nm) nanospheres , where H 3 PO 4 acts as phosphorus source for forming C-P bonds and enhancing C=O bonds to further reduce the desolvation energy barrier. In practical application, a quasi-solid-state flexible ZIHC is constructed, which provides a battery-level energy density (293.4 Wh kg −1 ) at a power density (180 W kg − 1 ) and a remarkable capacity retention of 93.4 % after 10 000 cycles. Electrochemical analyses, DFT calculations and structural characterization reveal that ultra-microporous is proved to be a prerequisite for C-P/C=O that are expected to further deplete solvent molecules within a Zn 2+ solvation sheath. Also, the coupling effect between the strong adsorption of Zn 2+ by C-P/C=O and the hydrophobic effect of C-P play an important role in facilitating desolvation process. This work creates a precedent for the application of ultra-microporous carbon materials in ZHICs and provides a brand-new approach for breaking the bottleneck of the low energy density and poor lifespan of ZHICs.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
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IF 5.7
Aolin Xie,Bei Zhang,Yicheng Ge,Ke Peng,Ping Xu,Xiaodong Wang,Zhirong Feng,Maozhong Yi,Zhe Zhou
To maintain the thermal stability of SiC nanowires during SiC coating fabrication process, carbon and SiC double protective layers were covered on the surface of nanowires. And SiC nanowires with double protective layers toughened SiC coating were prepared by pack cementation. The results showed that after introducing the SiC nanowires with double protective layers, the fracture toughness of the SiC coating was increased by 88.4 %. The coating protected C/C for 175 h with a mass loss of 3.67 %, and after 51 thermal shock cycles, the mass losses of the oxidized coating were 3.96 %. The double protective layers are beneficial to improve the thermal stability of nanowires, leading to good fracture toughness and thermal shock resistance of SiC coating. SiC nanowires consume the energy of crack propagation by fracture, pullout and bridging, leading to an increase in fracture toughness.
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Materials Today Sustainability
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2023
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IF 7.8
G. Yang,H. Sun,R. Liu,J. Shi,X. Tong
Heterogeneous catalytic and selective C–C bond cleavage is considered as the important way for the production of high valuable compounds from large-molecule-weight feedstock . In this article, a sustainable and efficient aerobic oxidative C–C bond cleavage of lignin models is developed with the bismuth-based solid catalyst. Therein, the flower-like Bi 2 O 2 CO 3 exhibits a high photocatalytic efficiency in the reaction medium combined of n-butanol and tetramethylammonium bromide. For example, the selective oxidative C–C bond cleavage of 1-phenyl-ethane-1, 2-diol has been successfully carried out, where the substrate conversion and the selectivity of benzaldehyde was 95% and 99%, respectively. The study exhibited that the amount of oxygen vacancies plays a significant role on the photocatalytic selective aerobic oxidative cleavage processes. Moreover, the selective aerobic oxidative C–C bond cleavage of different lignin models was investigated, and all the yields of corresponding products are more than 90% with this photocatalytic system. Furthermore, the used flower-like Bi 2 O 2 CO 3 can be recycled at least 5 times without the obvious decrease of catalytic activity .
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JOURNAL OF ORGANIC CHEMISTRY
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2022
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IF 4.198
Hong-Li Huang,Juan Xu,Ya-Xin Fan,Qing-Qiang Su,Ji-Yuan Du,Ru-Fen Zhang,Yan-lan Wang,Honggang Hu,Fei Gao
The visible-light-promoted difunctionalization of alkenyl ketones has been developed for easy access of various tetralones, cyclopropane, or alkenyl migration compounds. With fac-[Ir(ppy)3] as the photocatalyst, alkenyl ketones captured the α-carbonyl alkyl radical and evolved through intramolecular cyclization and the elimination of a proton to give the difunctionalized products. This strategy is characterized by good yields, mild reaction conditions, and outstanding functional group tolerance.
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ELECTROCHIMICA ACTA
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2022
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IF 7.336
Bingying Zhu,Xiaotang Shi,Tianle Zheng,Jianwei Xiong,Ya-Jun Cheng,Yonggao Xia
Lithium secondary battery with a wide working temperature range is crucial to boost its increasing applications in harsh circumstances. Suppressing excessive electrolyte decomposition at high temperatures while maintaining reasonable electrochemical kinetics at low temperatures is critical for wide-temperature electrochemical performance. Construction of high temperature stable electrode-electrolyte interface layer by electrolyte formulation is an effective strategy to prevent electrolyte from uncontrollable decomposition. On the contrary to conventional thinking, propylene carbonate (PC) bearing poor filming ability to suppress electrolyte decomposition is used in this work to promote decomposition of the single lithium difluoro(oxalate)borate (LiODFB) salt in the electrolyte, producing inorganic-rich interface layer with good structure stability over a wide temperature range. Glutaronitrile (GLN) is further utilized to minimize the decomposition of PC by expelling PC out of the solvation sheath of lithium-ion. The teamwork of LiODFB, PC, and GLN makes a synergistic contribution to building a high-temperature stable electrode-electrolyte interface layer at both LFP and MCMB electrodes. Based on the approach developed in this work, the temperature window is successfully expanded to the range of from -40 °C to 140 °C. Excellent electrochemical performance is exhibited by both LFP/Li and MCMB/Li cells from -20 °C to 100 °C in terms of reversible capacity and cyclic stability.
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CHINESE JOURNAL OF CATALYSIS
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2022
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IF 12.92
Jing-Yu Li,Ming-Yu Qi,Yi-Jun Xu
Integrating selective organic synthesis with hydrogen (H 2 ) evolution in one photocatalytic redox reaction system sheds light on the underlying approach for concurrent employment of photogenerated electrons and holes towards efficient production of solar fuels and chemicals. In this work, a facile one-pot oil bath method has been proposed to fabricate a noble metal-free ultrathin Ni-doped ZnIn 2 S 4 (ZIS/Ni) composite nanosheet for effective solar-driven selective dehydrocoupling of benzyl alcohol into value-added C–C coupled hydrobenzoin and H 2 fuel, which exhibits higher performance than pure ZIS nanosheet. The remarkably improved photoredox activity of ZIS/Ni is mainly attributed to the optimized electron structure featuring narrower band gap and suitable energy band position, which facilitates the ability of light harvesting and photoexcited charge carrier separation and transfer. Furthermore, it has been demonstrated that it is feasible to employ ZIS/Ni for various aromatic alcohols dehydrocoupling to the corresponding C–C coupled products. It is expected that this work can stimulate further interest on the establishment of innovative photocatalytic redox platform coupling clean solar fuels synthesis and selective organic conversion in a sustainable manner.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2026
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IF 9.2
Dan Zhang,Jin Liu,Bin Song,Chenyu Li,Yuyao Chen,Huaifang Zhang,Yuanyuan Feng
“Time-amount” precise phosphidation successfully constructs amorphous/crystalline/metallic three-phase heterojunction. • Multiphase heterojunction functional synergy facilitates the spatial division of labor for HER pathway at the nanoscale. • Ru→Ru 2 P→a-Ru 2 P relay electron transfer mechanism ensures its excellent seawater HER at industrial current density. Sluggish water dissociation kinetics and stability issues caused by chloride ions pose severe challenges for hydrogen evolution reaction (HER) catalysts in alkaline seawater environments. This study proposes a design philosophy of “multiphase heterojunction functional synergy”. Through a precise microwave phosphidation strategy, a three-phase heterojunction catalyst composed of amorphous Ru 2 P, crystalline Ru 2 P, and metallic Ru (a/c-Ru 2 P@Ru/C) was successfully synthesized. Systematic modulation enabled controllable synthesis of the catalyst's microstructure (amorphous/crystalline phase ratio) and macroscopic composition. This catalyst demonstrates outstanding comprehensive performance in alkaline seawater media: it exhibits a low overpotential of only 36 mV at a current density of 10 mA cm −2 , maintains stable operation for over 200 h at a high current density of 500 mA cm −2 , and shows leading cell voltage for overall water splitting. A series of characterizations indicate that the successful formation of a three-phase heterostructure in a/c-Ru 2 P@Ru/C induces interfacial electron transfer from Ru to phosphides, thereby optimizing the electronic structure of active sites. This multiphase synergy achieves a “spatial division of labor” in the HER reaction pathway: electron-rich amorphous regions promote water dissociation, while electron-modulated metallic sites accelerate hydrogen desorption. Concurrently, the robust heterointerface ensures long-term stability under harsh seawater conditions.
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