ADVANCES IN POLYMER TECHNOLOGY
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2017
·Vol. 37
·期 7
·2552-2560
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IF 1.291
Han Xue,Nuona A,Yinghong Xiao,Jianfei Che
Single-walled carbon nanotubes–carbon fiber (SWNTs@CF) hierarchical fibers were prepared by electrophoretic deposition. To improve the interfacial strength between SWNTs and CF, a hexahapto-metal complex, Cr(CO) 6 , was added to the electrophoretic system to prepare hierarchical fibers (SWNTs-Cr(CO) 6 @CF). Results revealed that SWNTs covered CF surface entirely and formed a hierarchical structure. The morphology could be tailored from scattered nanotubes over forest to network by varying the deposition voltage. The hierarchical fibers were highly compatible with epoxy matrix, which could significantly increase the interfacial adhesion through interlocking epoxy matrix. Tensile properties were studied to investigate the effect of interfacial adhesion on mechanical properties of the reinforced composites. The polymeric composite, reinforced by SWNTs-Cr(CO) 6 @CF, exhibited a remarkably high tensile strength of 519 MPa with the content ratio of 1.5:1 (Cr(CO) 6 :SWNTs). The improvement was up to 193% compared to the desized CF composite and 19% compared to SWNTs@CF composite. Additionally, thermogravimetric analyses demonstrated that the SWNTs-Cr(CO) 6 @CF composite exhibited superior heat stability.
研究领域:
材料科学
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复合材料
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DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Zhe Zheng,Kaiyu Dong,Xiaotong Yang,Qiang Yuan
Metallenes have received sustained attention owing to their unique microstructure characteristics and compelling catalytic applications, but the synthesis of multielement crystalline–amorphous metallenes remains a formidable challenge. Herein, we report a one-step wet chemical reduction method to synthesize composition-tunable crystalline–amorphous heterophase PdMoCrW tetrametallene. As-synthesized PdMoCrW tetrametallene is composed of approximately six to seven atomic layers and has flexible crimpiness, a crystalline–amorphous heterophase structure, and high-valence metal species. Time-dependent experiments show that PdMoCrW tetrametallene follows a three-step growth mechanism that includes nucleation, lateral growth, and atom diffusion, respectively. The novel ultrathin structure, optimized Pd electronic structure, and hydrophilic surface together greatly promote the activity and stability of PdMoCrW tetrametallene in the alkaline oxygen reduction reaction. Pd75.9Mo9.4Cr8.9W5.8/C exhibits excellent mass and specific activities of 2.81 A mgPd–1 and 4.05 mA cm–2, which are 20.07/14.46 and 23.42/16.20 times higher than those of commercial Pt/C and Pd/C, respectively. Furthermore, a Zn–air battery assembled using Pd75.9Mo9.4Cr8.9W5.8/C as a cathode catalyst achieves a peak power density of 156 mW cm–2 and an ultralong durability of 329 h. This study reports an effective strategy for constructing crystalline–amorphous quaternary metallenes to advance non-Pt electrocatalysts toward oxygen reduction reaction (ORR) performance and for a Zn–air battery.
研究领域:
材料科学
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能源科学
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DOI
PubMed
高影响因子
Surfaces and Interfaces
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2024
·
IF 5.7
Yunyun Ao,Xinyi Ling,Jinyu Zheng,Min Han,Dongdong Xu
In the realm of traditional electrocatalytic processes, the benefits of composition and two-dimensional ultrathin morphology have not often been explored in the context of multicomponent palladium-based nanosheets . In this work, we utilize a one-step solvothermal method to create nanosheets of a multicomponent alloy (PdPtMoCrCoNi NSs). The synthesis involves no surfactants, allowing for the exposure of more active sites or surface atoms. The resulting PdPtMoCrCoNi NSs exhibits outstanding performance in the electrooxidation of ethylene glycol under alkaline conditions, demonstrating high mass activity (10.12 A mg Pd+Pt −1 ), good stability, and enhanced anti-poisoning ability. The incorporation of more low-cost alloyed elements not only reduces the overall cost of electrocatalysts but also effectively tailors the electronic state to enhance the corresponding electrocatalytic performance.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Ranran Wei,Xiaoying Zhang,Min Yan,Xianlong Wang,Xuewen Wei,Runqi Zhang,Yinglong Wang,Liang Wang,Shuli Yin
Compared with layered materials such as graphite and transition metal disulfide compounds with highly anisotropic in-plane covalent bonds , it is inherently more challenging to obtain independent metallic two-dimensional films with atomic thickness. In this study, PtNi layered metallene nanobowls (LMBs) with multilayer atomic-scale nanosheets and bowl-like structures have been synthesized in one step using structural and electronic effects. The material has the advantage of catalyzing pH-universal hydrogen evolution reaction (HER). Compared with Pt/C, PtNi LMBs exhibited excellent HER activity and stability under all pH conditions. The overpotentials of 10 mA cm −2 at 0.5 M H 2 SO 4 , 1.0 M phosphate buffer and 1.0 M KOH were 14.8, 20.3, and 34.0 mV, respectively. Under acidic, neutral and alkaline conditions, the HER Faraday efficiencies reach 98.97%, 98.85%, and 99.04%, respectively. This study provides an example for the preparation of unique multilayer nanobowls, and also provides a basic research platform for the development of special HER materials.
研究领域:
材料科学
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电化学
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纳米技术
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DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Songliang Liu,Kun Ma,Huaifang Teng,Weixin Miao,Xiaotong Zhou,Xuejing Cui,Xin Zhou,Luhua Jiang,Shaojun Guo
Innovating nanocatalysts with both high intrinsic catalytic activity and high selectivity is crucial for multi-electron reactions, however, their low mass/electron transport at industrial-level currents is often overlooked, which usually leads to low comprehensive performance at the device level. Herein, a Cl − /O 2 etching-assisted self-assembly strategy is reported for synthesizing a self-assembled gap-rich PdMn nanofibers with high mass/electron transport highway for greatly enhancing the electrocatalytic reforming of waste plastics at industrial-level currents. The self-assembled PdMn nanofiber shows excellent catalytic activity in upcycling waste plastics into glycolic acid, with a high current density of 223 mA cm −2 @0.75 V ( vs RHE), high selectivity (95.6%), and Faraday efficiency (94.3%) to glycolic acid in a flow electrolyzer. Density functional theory calculation, X-ray absorption spectroscopy combined with in situ electrochemical Fourier transform infrared spectroscopy reveals that the introduction of highly oxophilic Mn induces a downshift of the d -band center of Pd, which optimizes the adsorption energy of the reaction intermediates on PdMn surface, thereby facilitating the desorption of glycolic acid as a high-value product. Computational fluid dynamics simulations confirm that the gap-rich nanofiber structure is conducive for mass transfer to deliver an industrial-level current.
研究领域:
材料科学
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环境科学
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催化化学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Songliang Liu,Hugang Zhang,Hongjie Yu,Kai Deng,Ziqiang Wang,You Xu,Liang Wang,Hongjing Wang
Metallene with unusual physicochemical properties is a very promising class of two-dimensional electrocatalyst for efficient electrochemical hydrogen production . However, the controllable construction of metallene in the extension direction remains a great challenge. Herein, PdRh bimetallenes (PdRh BMs) and PdRh bimetallene nanoribbons (PdRh BNRs) were controllably prepared by solvent-induced strategy for efficient hydrogen evolution. The overpotential required for PdRh BNRs to reach 10 mA cm –2 at 1 M KOH is only 32 mV, which is better than PdRh BMs and Pd metallene nanoribbons. Aberration-corrected HRTEM revealed abundant defects on the surface of PdRh BNRs, which not only act as high active sites but also generate strong strain to significantly reduce the d -band center of Pd. This work provides guidance for the construction of high efficiency catalysts in metallene by applying defect engineering and strain engineering, and also provides a novel strategy for the controllable extension of metallene in longitudinal dimension.
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高影响因子
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