JOURNAL OF POWER SOURCES
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2026
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IF 8.4
Ziyun Zhang,Huicheng Ge,Zichuan Liu,Siqin Zhu,Bo Shi,Lingli Cheng,Zhen Li,Xuechun Yang,Zheng Jiao
A dynamic crystal-amorphous interface engineering strategy is proposed to address the intrinsic challenges of sluggish kinetics and structural degradation in vanadium-based cathodes for aqueous zinc-ion batteries (AZIBs). Through spontaneous electrochemical phase transformation, vanadium oxide/vanadium nitride anchored on carbon nanofibers (V 2 O 3 /VN-CNFs) is in situ converted into a vanadium oxide electrode featuring an intimately coupled crystalline/amorphous VO x (c-VO x /a-VO x ) heterointerface. This adaptive structure combines the merits of both phases: the crystalline domains ensure efficient electron conduction and framework stability, while the amorphous regions offer numerous defective sites for rapid Zn 2+ storage and diffusion. The strong coupling between the two phases generates built-in electric fields at the interface, which effectively promote charge transfer and reduce Zn 2+ diffusion barriers, as further elucidated by DFT calculations. Benefiting from this unique architecture, the c-VO x /a-VO x -CNFs cathode achieves a remarkable capacity of 715.3 mAh g −1 at 0.5 A g −1 , excellent rate performance (400.1 mAh g −1 at 100 A g −1 ), and outstanding cycling stability (95.5% retention after 20,000 cycles). This study highlights the promise of electrochemically self-optimized heterointerfaces in advancing high-performance AZIBs.
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DOI
高影响因子
JOURNAL OF CATALYSIS
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2025
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IF 6.5
Yuhao Yang,Jie Ran,Teng Wang,Yongning Ma,Junli Zhu,Xiaolong Li,Zhuoya Zhao
Aqueous phase reforming of methanol (APRM) is an effective method for the storage and transportation of hydrogen (H 2 ). However, this approach faces challenges due to the limited activity and stability of metal-supported catalysts. In this study, Pt/V 2 O 3 -V 8 C 7 metal-supported catalysts were prepared for APRM and the H 2 production of Pt/V 2 O 3 -V 8 C 7 at 200 °C was 96.52 mmol·g −1 ·h −1 , which is 1.83 times and 1.71 times higher than the H 2 production performance of Pt/V 2 O 3 and Pt/V 8 C 7 , respectively. Moreover, the catalyst demonstrated remarkable stability after 10 in situ cycling tests. Structural characterization revealed that there is a strong metal-support interaction (SMSI) between Pt and V 8 C 7 , and a weak metal-support interaction (WMSI) between Pt and V 2 O 3 , which inhibits the sintering of Pt on the metal-supported catalyst. Furthermore, a straightforward experimental method has been developed that enables accurate inference of the catalytic reaction mechanism in APRM without the need for in situ material characterization. The reaction mechanism indicates that the Pt-V 8 C 7 interface serves as the active site for the methanol decomposition step, while the surface of V 2 O 3 acts as the active site for the water-gas shift reaction step. This strategy of strong-weak MSI offers a novel approach to enhancing both the stability and H 2 production performance in APRM.
研究领域:
催化
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能量转换
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材料科学
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化学反应工程
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2024
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IF 2.7
L Ruiyi,Chen Yang,Zaijun Li,Mingjie Gas
Vanadium oxide become a promising electrode material for supercapacitors because of high capacitance and multiple redox. However, low intrinsic conductivity, narrow interlayer spacing and poor structural stability limit its practical application. The study reports construction of Co-doped V2O3 using asparagic acid-functionalized graphene quantum dot (GQD) and biomass carbon (BC). Firstly, V5+ and Co2+ were combined with GQD to form Co/V-GQD complex. Then, it was adsorbed on cotton, dried and annealed. The resulting Co-V2O3-GQD@BC shows one three-dimensional carbon framework. The formed V2O3 nanocrystals with rich edges and corners are dispersed on the carbon sheets. V5+ was partly reduced to form low valent V2+ specie. The V2+ and Co2+ self-doping narrows the bandgap and creates new electron transfer pathways. Graphene modification accelerates the electron transfer from V2O3 to graphene and improves the structural stability. The integration of double doping with graphene modification realizes a significant improvement of electrical conductivity and safe voltage window (1.8 V). The specific capacitance of V2O3 in Co-V2O3-GQD@BC reaches 2182.89 F g-1, which is more than other vanadium oxide electrodes. The symmetrical supercapacitor with Co-V2O3-GQD@BC electrodes provides a high capacitance (664.89 F g-1 at current density of 1 A g-1), high-rate capacity (366.67 F g-1 at 50 A g-1), cycling stability (97.65% capacitance retention after 10000-cycle) and energy density (74.8 W h kg-1 at power density of 425 W kg-1).
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
ACS Omega
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2021
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IF 3.512
Kezhong Wu,Yingshan Wu,Pengyuan Fu,Dandan Yang,Bei Ruan,Mingxing Wu,Ruitao Wu
To replace precious Pt-based counter electrodes (CEs) with a low-cost Pt-free catalyst of CEs is still a motivating hotspot to decrease the fabrication cost of dye-sensitized solar cells (DSSCs). Herein, four different V2O3@C composite catalysts were synthesized by pyrolysis of a precursor under N2 flow at 1100 °C and further served as catalytic materials of CEs for the encapsulation of DSSCs. The precursors of V2O3@C composites have been prepared via a sol–gel method using different proportions of V2O5 with soluble starch in a H2O2 solution. Power conversion efficiencies (PCEs) of 3.59, 4.79, 5.15, and 5.06% were obtained from different V2O3@C composites, with soluble starch-to-V2O5 mass ratios (S/V) of 1:2, 1:1, 2:1, and 4:1, respectively, as CEs to reduce iodide/triiodide in DSSCs. The improvement of electrode performance is due to the combined effects on the increased specific surface area and the enhanced conductivity of V2O3@C composite catalysts.
研究领域:
材料科学
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能源科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
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