JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Safdar Ali,Saddique Jaffer,Inamullah Maitlo,Farooq Khurum Shehzad,Qunying Wang,Sikandar Ali,Muhammad Yasir Akram,Yong He,Jun Nie
Silicon based anode materials has got significant attention in recent years due to its environmental affinity, lower cost and high capacity in lithium ion batteries . The Photo cured 3D porous Silica-carbon membrane (SiO 2 –C material) was synthesized via binary phase solid state photo-polymerization, freeze dried to obtain porous membrane and then used as template to get silica deposited membrane by chemical vapor deposition method (CVD) at 30 ° C, followed by calcination . The silicon deposition has been confirmed by X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS). The Barret-Joyner-Halenda (BJH) pore size distribution results showed the pore size of 10.2924 nm and surface area of 21.1957 m 2 /g with cumulative pore volume of 0.040248 cm³/g. The first discharge capacity reached to 719 mAhg −1 with 79.94% columbic efficiency regarding first cycle and discharge capacity for 100 cycles reached to 693 mAhg −1 with 99% columbic efficiency, which indicated high reaction reversibility. The silicon deposition with a porous structure improved the electronic conductivity and stabilized the material. The better electrochemical performance observed could be due to porous structure and carbon matrix of SiO 2 –C material.
研究领域:
材料科学
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能源存储技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Zhihui Yao,Yuting Li,Daisong Chen,Yiwen Zhang,Xinghong Bao,Juan Wang,Qin Zhong
Carbon-based materials have shown promising results in replacing commercial Pt/C as highly efficient oxygen reduction reaction (ORR) catalysts in renewable energy devices. Designing unique structures of carbon matrix and introducing more active sites are essential for their application as electrode materials. Herein, a feasible approach is reported to synthesize dispersive γ -Fe 2 O 3 clusters embedded in 1D porous carbon nanofibers (CNFs) ( γ -Fe 2 O 3 @CNFs-12) through electrospinning, impregnation and pyrolysis processes. The resulted γ -Fe 2 O 3 @CNFs-12 exhibits excellent ORR performance in alkaline electrolyte with a surprising half-wave potential ( E 1/2 ) of 0.905 V and merely 5 mV drop of the potential after 5000 cycles, outperforming that of commercial Pt/C. Meanwhile, it also shows considerable ORR performance in acidic and neutral media. The remarkable ORR catalytic activity and durability are primarily attributable to the well-designed 1D hierarchical porous structure and accessible γ -Fe 2 O 3 clusters that embedded in carbon nanofibers. γ -Fe 2 O 3 @CNFs-12 is also capable to act as an air cathode for Zn-air batteries with an open circuit voltage of 1.428 V. This work provides a new perspective to the novel design and synthesis of carbon-based ORR electrocatalysts.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 38
·20518-20527
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IF 11.9
Wenxuan Hou,Baojun Wang,Shikuo Li,Fangzhi Huang,Hengxiu Yang,Hui Zhang
In the face of increasingly serious electromagnetic radiation pollution, there is an urgent need to develop new materials with efficient electromagnetic wave absorption. Heterointerface engineering can control the electromagnetic characteristics by adjusting the conductivity and complex permittivity to achieve excellent electromagnetic wave absorption ability. Herein, inspired by honeycomb with an ordered porous structure, we designed a N-doped honeycomb-like porous carbon matrix via a spatially confined-etching strategy, and ultra-fine sized Mo2C nanoparticles were embedded to construct multiple heterointerfaces. Simultaneously, the unique 3D structure successfully prevents the agglomeration of nanoparticles, which is conducive to deeply constructing heterointerfaces and thus enhancing interfacial polarization. Furthermore, the doping of heteroatoms can also trigger strong dipole polarization to improve electromagnetic energy conversion efficiency. Consequently, the composite combined honeycomb-like porous structure with rich Mo2C/C heterointerfaces presents outstanding electromagnetic absorption with a minimum reflection loss value of −65 dB and effective absorption bandwidth up to 5.52 GHz. This study provides new strategies and insights for heterointerface engineering to achieve efficient electromagnetic absorption performance and has broad application prospects in the field of electromagnetic wave absorption.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials Advances
·
2020
·Vol. 2
·期 1
·336-344
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IF 0
Zhao Wei,Jingman Pang,Yuan Ji,Xing Yang,Yundan Liu,Long Ren,Yun Zhang
Durable electrolytic hydrogen production at high-current densities (>500 mA cm−2) is required as the basis of industrial scale hydrogen evolution reaction (HER). Electrocatalysts, with the purpose of accelerating HER, however, are far from meeting the requirements of high activity, cost effectiveness, and long-term stability, especially in alkaline media. Herein, a series of ultrafine bi- or tri-metallic Mo-based carbides embedded in a graphitic carbon matrix are synthesized by a direct solid reaction between metal molybdate and dicyandiamide (DCA). The components of the proposed multi-metallic carbides can be controlled in a facile manner by precisely configuring the molybdates with different metal cations, enabling the design of electrocatalysts with optimized active sites for HER. With the carbon layer protecting against corrosion, the as-prepared series of (NixCo1−x)6Mo6C2 carbides presents effective HER performance, in which the optimized stoichiometric sample ((Ni0.2Co0.8)6Mo6C2) requires an overpotential of 100 mV to drive 10 mA cm−2 current density for HER. With this electrocatalyst, a durable current density of 1000 mA cm−2 can be achieved by applying an overpotential of 1.84 V towards HER, which is even lower than the required potential of the Pt/C commercial electrocatalyst (2.12 V) for the same current density.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 27
·11861-11869
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IF 3.288
Shengnan Yue,Xueguang Wang,Shaoting Li,Yao Sheng,Xiujing Zou,Xionggang Lu,Chunlei Zhang
A highly chemoselective and recyclable ruthenium catalyst for the hydrogenation of halogenated nitroarenes has been prepared via the simple in situ calcination of a mixture of melamine, glucose and ruthenium trichloride. Superfine Ru particles (2.3 ± 0.3 nm) were obtained and highly dispersed in the nitrogen-doped carbon matrix. The Ru/CN catalyst smoothly transforms a variety of halogenated nitroarenes to the corresponding haloanilines with high intrinsic activity (e.g. TOF = 1333 h−1 for p-chloronitrobenzene) and selectivity of more than 99.6%. Furthermore, through an analysis of the products in the reaction process, it was concluded that there are two parallel reaction pathways (a direct pathway and an indirect pathway) for the hydrogenation of aromatic nitro compounds over the Ru/CN catalyst, and the direct pathway was proved to be dominant in catalyzing the intermediates.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 43
·21550-21557
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IF 9.931
Changyao Wang,Yujuan Zhao,Lili Zhou,Yang Liu,Wei Zhang,Zaiwang Zhao,Wael N. Hozzein,Hind M. S. Alharbi,Wei Li,Dongyuan Zhao
Transition metal oxides (TMOs)/carbon nanocomposites are promising for high capacity long life lithium ion batteries (LIBs). Herein, we report a mesoporous carbon matrix confinement growth strategy to synthesize ultrasmall WO3 nanocrystals for lithium storage. In this strategy, WCl6 and phenolic resins (resol) are co-assembled with amphiphilic diblock copolymer PEO-b-PS into ordered mesostructures through an evaporation induced self-assembly (EISA) process. During the pyrolysis process, the resol molecules can be polymerized and carbonized into amorphous mesoporous carbon matrices, which lock the amorphous W species well. Then, WO3 nanocrystals are formed and are uniformly distributed in the ordered mesoporous carbon matrix with the increased pyrolysis temperature; moreover, the particle size is well controlled to ∼3 nm under the confinement effect of the carbon matrices. The resultant ordered mesoporous carbon/WO3 composites show very large pore size (∼11.3 nm), high surface area (∼157 m2 g−1), high pore volume (∼0.25 cm3 g−1), and WO3 content of 84%. As an anode material for LIBs, the obtained composites show excellent cycling stability and rate performance. A high specific capacity of 440 mA h g−1 can be achieved after 100 cycles at a current density of 0.1 A g−1. We believe that such a confinement synthesis strategy is versatile to create TMO-based nanocomposites for outstanding LIBs.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Yinglin Yan,Xingsheng Zhang,Wei Jing,Pufang Liu,Muze Song,Chaojiang Fan,Rongfu Xu,Yiming Zou,Wei Yu,Qijiu Deng,Xianhui Wang,Lisheng Zhong,Rong Yang,Yunhua Xu
The low-tortuosity microchannels of wood-based carbon matrix in free-standing cathodes for lithium sulfur batteries (LSBs) were a double-edged sword, which brought in both a high energy density due to a high sulfur loading and severe shuttle effect for poor cycling stability. Herein, a layer of cellulose aerogel extracted from the wood wall was coated on the inner surface of the low-tortuosity microchannels of the wood plate, which was further transformed into a hierarchical carbon matrix using in free-standing cathode for LSBs. The decorated cathode exhibited a maximal specific capacity of 1377.2 mAh g −1 due to the enhanced utilizing ratio of active materials and exceptional cycling stability even under a high current density (1 C) for more than 500 cycles. Furthermore, the decorated cathode maintained good cycling stability with a higher sulfur areal loading (6.3 mg cm −2 ). The cellulose-based carbon aerogel coated on the inner surface of low-tortuosity microchannels provided a large specific surface area. This decoration strategy not only provided physical restriction on polysulfides but also increased conversion sites for polysulfides, improving the cycling performance of the wood-based free-standing cathode of LSBs. This work provided a potential structural design strategy for the advanced free-standing cathode of LSBs.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Huan Shi,Tuo Li,Yang Liu,Tong Yu,Zhenxiang Zhao,Linrui Hou,Changzhou Yuan
Sodium metal batteries (SMBs) have been widely investigated recently due to the low price of Na metal, satisfactory energy density and similar chemical properties to lithium. However, SMBs also face challenges like low Na utilization, dendrite growth, dead sodium accumulation, unstable solid electrolyte interphase and massive bubble generation. To improve their safety and cycling stability, herein, we fabricate a porous hybrid framework, i.e. , fine Bi nanoparticles anchored in porous N-doped carbon matrix (Bi@PNC), as a modified layer upon Cu collector toward stable SMBs. Upon electrochemical activation, the nanoscale Bi-derived Na–Bi alloy with high sodiophilicity reduces the nucleation overpotential of Na, inhibits the formation of Na dendrites, and decreases the loss of Na during cycling. Thanks to these striking merits, the half cells assembled with Na undergo 1600 cycles (3200 h) at 1 mA cm −2 , 1 mAh cm −2 with the average Coulombic efficiency of 99.95%. The optimized Bi@PNC based symmetric cells still maintain the overpotential of ∼9.2 mV under 1 mA cm −2 and depth of discharge of 16.7% after cycling for 2420 h. Furthermore, the assembled less-Na full SMBs exhibit superb electrochemical properties. Our strategy here provides meaningful avenue to construct stable less-Na metallic anodes for advanced SMBs.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
S.Y. Zhu,Y.F. Yuan,P.F. Du,C.L. Mo,G.C. Cai,B.X. Wang,S.Y. Guo
Low specific capacity and poor cycling performance are two main problems of Mn-based oxides that hinder their application in aqueous zinc-ion batteries (ZIBs). Herein, we design a facile sacrificial template method to construct a unique three-dimensional macroporous honeycomb-like hollow carbon matrix, and then grow ultrasmall Mn 3 O 4 nanocrystalline with the diameter of 5 nm inside the hollow carbon matrix. The composite has large surface area (56.9 m 2 g −1 ) and high Mn 3 O 4 content (about 47.1%). When the composite is used as the cathode material of ZIBs, it exhibits extraordinary discharge capacity of 845 mAh g −1 at 1 A g −1 , impressive rate capability with average discharge capacity of 46 mAh g −1 at 10 A g −1 , and superior long-term cycling performance with discharge capacity of 123 mAh g −1 at 5 A g −1 after 800 cycles. Electrochemical kinetics measurements and ex-situ XRD, SEM and TEM further demonstrate that the macroporous honeycomb-like hollow carbon matrix significantly increases electronic conductivity and structural stability of Mn 3 O 4 . Besides, electrochemical activity and surface capacitive effect of Mn 3 O 4 are also greatly enhanced by its ultrasmall size.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Shuang Xu,Lijun Li,Zhaoliang Yu,Xiaodong Dai,Shuyan Yu,Congju Li
M/N/C-based single-atom catalysts (SACs) attract significant attention for oxygen reduction reactions (ORR), with Fe-Nx SACs demonstrating the highest activity. However, the Fenton reaction between iron-based catalysts and H 2 O 2 causes carbon matrix oxidation and corrosion, leading to stability issues. In this work, ZIF-8 serves as a substrate for anchoring Cr atoms, producing Cr-Nx/C SACs with low Fenton reaction activity through pyrolysis. To enhance Cr-Nx activity and further suppress the Fenton reaction, the carbon matrix is carefully engineered. Electrospinning technology uniformly distributes Cr-Nx/C as a functional structure on carbon nanofibers, resulting in Cr-Nx/C@CNF SACs. During pyrolysis, Zn volatilization from ZIF-8 generates numerous mesoporous structures that precisely connect to the catalytic active sites. The spatial network structure formed by the carbon nanofibers further contributes to the hierarchical porous carbon nanostructure of Cr-Nx/C@CNF SACs. The optimized Cr-Nx/ [email protected] catalyst exhibits excellent ORR activity, with a half-wave potential of 0.739 V vs. RHE. More importantly, the introduction of Cr-Nx and the optimized carbon matrix effectively suppress the Fenton reaction, improving stability. Furthermore, microbial fuel cells (MFCs) using Cr-Nx/ [email protected] as the cathode catalyst achieve a power density of 674.98 mW/m 2 and demonstrate superior durability, outperforming commercial Pt/C catalysts.
研究领域:
电催化
·
环境能源材料
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纳米材料化学
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生物电化学
·
可持续能源技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）