Chemistry-An Asian Journal
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2019
·Vol. 14
·期 9
·1557-1569
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IF 3.698
Xiaoyan Wang,Dong Zhao,Chao Wang,Yonggao Xia,Wenshuai Jiang,Senlin Xia,Shanshan Yin,Xiuxia Zuo,Ezzeldin Metwalli,Ying Xiao,Zaicheng Sun,Jin Zhu,Peter Müller-Buschbaum,Ya-Jun Cheng
Graphical The Matrix Reloaded 2 : In situ synthesized super-small TiO 2 and nickel nanoparticles uniformly embedded in the carbon matrix effectively improve the electrochemical performance as both lithium-ion and sodium-ion battery anodes due to a significantly enhanced charge-carrier mobility by the nickel nanoparticles. Super-small sized TiO 2 nanoparticles are in situ co-composited with carbon and nickel nanoparticles in a facile scalable way, using difunctional methacrylate monomers as solvent and carbon source. Good control over crystallinity, morphology, and dispersion of the nanohybrid is achieved because of the thermosetting nature of the resin polymer. The effects of the nickel nanoparticle on the composition, crystallographic phase, structure, morphology, tap density, specific surface area, and electrochemical performance as both lithium-ion and sodium-ion battery anodes are systematically investigated. It is found that the incorporation of the in situ formed nickel nanoparticles with certain content effectively enhances the electrochemical performance including reversible capacities, cyclic stability and rate performance as both lithium-ion and sodium-ion battery anodes. The experimental I-V profiles at different temperatures and theoretical calculations reveal that the charge carriers are accumulated in the amorphous carbon regions, which act as scattering centers to the carriers and lower the carrier mobility for the composite. With increasing nickel content, the mobility of the charge carriers is significantly increased, while the number of the charge carriers maintains almost constant. The nickel nanoparticles provide extra pathways for the accumulated charge, leading to reduced scatterings among the charge carriers and enhanced charge-carrier transportation.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Chenxiao Chu,Jing Yang,Qianqian Zhang,Nana Wang,Feier Niu,Xuena Xu,Jian Yang,Weiliu Fan,Yitai Qian
Flower-like assembly of ultrathin nanosheets composed of anatase and bronze TiO2 embedded in carbon is successfully synthesized by a simple solvothermal reaction, followed with a high-temperature annealing. As an anode material in sodium-ion batteries, this composite exhibits outstanding electrochemical performances. It delivers a reversible capacity of 120 mA h g–1 over 6000 cycles at 10 C. Even at 100 C, there is still a capacity of 104 mA h g–1. Besides carbon matrix and hierarchical structure, abundant interfaces between anatase and bronze greatly enhance the performance by offering additional sites for reversible Na+ storage and improving the charge-transfer kinetics. The interface enhancements are confirmed by discharge/charge profiles, rate performances, electrochemical impedance spectra, and first-principle calculations. These results offer a new pathway to upgrade the performances of anode materials in sodium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
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2025
·
IF 4.7
Ruiting Wang,Min Tian,Guanying Ye,Xinrui Li,Guoda Li,Suqin Liu,Zhen He
Metal-nitrogen (M-Nx) moieties are recognized as the most active sites in metal-nitrogen codoped carbon catalysts (M-N/C) toward the oxygen reduction reaction (ORR). Controllable construction of the M-Nx sites and effective exposure of them at the catalyst–electrolyte interfaces are critical for the high-efficiency electrocatalysis of oxygen reduction. Herein, a universal synthesis strategy is developed to construct surface-enriched and highly dispersed M-Nx sites of various metal centers (including Co, Fe, Cu, Ni, Mn, and Bi) in M-N/C by utilizing a prefabricated pyridine-nitrogen-rich carbon matrix to anchor the metal ions from the corresponding metal chloride vapors. All the as-synthesized M-N/C catalysts demonstrate outstanding ORR activities and excellent long-term stability, among which the optimized Co-N/C exhibits an exceptional ORR half-wave potential (E1/2) of 0.900 V vs RHE (VRHE) and only 6% current loss after testing at 0.60 VRHE for 16 h in a 0.1 mol L–1 KOH solution. This work opens new possibilities for the fabrication of high-performance M-N/C catalysts with various metallic centers or even multiple kinds of metallic centers for different applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Xixi Chen,Ruxing Gao,Qiang Wang,Kehao Hu,Fenfen Wang,Chao Deng,Lujing Xu,Chundong Zhang,Ki-Won Jun,Seok Ki Kim,Tiansheng Zhao,Hui Wan,Guofeng Guan
Direct hydrogenation of CO 2 to liquid hydrocarbons via modified Fischer-Tropsch synthesis represents an appealing and sustainable route for efficient CO 2 utilization. However, the selective production of liquid hydrocarbons remains a significant challenge. In this work, we designed a series of carbon-coated K/Fe-C catalysts with various K loadings (ranging from 0 to 8 wt%) that enhance C 5+ hydrocarbon selectivity during CO 2 hydrogenation. It is found that the 4 K/Fe-C catalyst exhibits the highest C 5+ selectivity of 54.78 % at CO 2 conversion of 32.40 % and good stability within 100 h time-on-stream. This is attributed to the high dispersion of the Fe nanoparticles and the confinement effect of porous carbon matrix on the aggregation of Fe nanoparticles, resulting in high catalytic activity and selectivity. Meanwhile, the well dispersed K on the porous carbon matrix can reduce the particle size of Fe nanoparticles and promote the production of iron carbide active species for CO 2 -FTS, thus facilitating the selective formation of C 5+ hydrocarbons. Moreover, we also discussed a possible reaction mechanism for the direct hydrogenation of CO 2 to C 5+ hydrocarbons over the K/Fe-C catalysts. This study provides deep insights into the design of efficient Fe-C catalysts for converting CO 2 to liquid hydrocarbons.
研究领域:
催化化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2023
·
IF 5.5
Liping Zhao,Ye Zhao,Lihe Zhao,Gang Liu
A nitrogen–sulfur dual-doped black fungus porous carbon (NS-FPC) matrix was prepared with natural black fungus as the carbon source and cysteine as the nitrogen–sulfur source. A black fungus-based solution was obtained by hydrothermal treatment. After further carbonization activation and combination with sulfur processing, the NS-FPC/S positive electrode materials were prepared. The uniform recombination of biomass carbon provides an efficient conductive framework for sulfur. The porous structure is conducive to the transport of electrolytes. Heteroatom doping can provide a more active site. The structure and composition analyses of the materials were carried out using X-ray diffraction (XRD). The electronic binding energy and bonding state were analyzed by X-ray photoelectron spectroscopy (XPS). The morphology was observed by scanning electron microscopy and transmission electron microscopy. The specific surface area and pore size distribution were analyzed using an N 2 adsorption–desorption experiment. Sulfur loading was determined through thermogravimetric analysis. The electrochemical performance of NS-FPC/S in Li–S batteries was systematically investigated. The result shows that the NS-FPC/S electrode maintains more than 1,000 mAh g -1 reversible capacity after 100 cycles at 0.2 C current density, with a capacity retention of 85%. The cycle and rate performance are both considerably superior to those of traditional activated carbon materials.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Saudi Chemical Society
·
2024
·
IF 5.8
Liping Zhao,Ye Zhao,Lihe Zhao,Gang Liu
A nitrogen-phosphorus dual-doped auricularia auricula carbon (NP-AC) matrix was prepared through hydrothermal treatment using natural auricularia auricula as raw material and medium solution. Yeast was introduced and cultured by the auricularia auricula liquid medium. The NP-AC/S composite was prepared through further freeze-drying, carbonization, activation and compounding with sulfur procedures. The composition and microstructure of samples was characterized by X-ray diffraction (XRD), raman and X-ray photoelectron spectroscopy (XPS). The morphology was observed under scanning electron microscope (SEM) and transmission electron microscopy (TEM) method. The specific surface area was analyzed using nitrogen adsorption/desorption test. The weight ratio of sulfur was measured through thermogravimetric (TG) analysis. The original structure and composition of biomass were improved by yeast fermentation and the auricularia auricula block structure with low porosity was modified. The electrochemical performance of NP-AC/S composite in Li-S batteries was systematically explored. After 100 cycles at 0.2C current density, there was still nearly 1000 mAh g −1 reversible capacity, holding a capacity retention rate of more than 84 %. The cycle performance and rate performance were both far better than the ordinary activated carbon materials.
研究领域:
材料科学
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能源科学
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生物技术
✓ 已验证
产品关联
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
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2022
·Vol. 47
·期 10
·e202200076
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IF 2.134
Zhenzhan Yan,Shuang Wang,Li Yang,Jimin Han,Wenchao Tong
In this work, graphene oxide-doped lead-containing metal-organic framework (BTC−Pb/GO) and polyvinyl alcohol were used as raw materials to prepare spherical or cylindrical lead azide composites by freeze-drying, carbonization, and in-situ azide steps. Nanoscale lead azide is uniformly distributed on the graphene-doped porous carbon framework. Detailed characterization and testing show that LA/C/rGO exhibits excellent electrostatic sensitivity (1.94 J) and flame sensitivity (40 cm) due to the excellent electrical and thermal conductivity of porous carbon and graphene, which are superior to most of the previously reported modified lead azide.
研究领域:
材料科学
·
爆炸物化学
✓ 已验证
DOI
高影响因子
Inorganics
·
2024
·Vol. 12
·期 11
·291
·
IF 3.1
Jianguo Zhong,Ting Zhang,Jianqiang Tian,Wei Gao,Yuxin Wang
Transition metal phosphides (TMPs) show great potential as catalysts for the hydrogen evolution reaction (HER). FeP stands out as an efficient and cost-effective non-noble metal-based HER catalyst. However, FeP tends to aggregate and suffer from instability during the reaction. To tackle these challenges, we developed an efficient and straightforward approach to load metal-organic framework-derived N/P co-doped carbon-encapsulated FeP nanoparticles onto a nickel foam substrate (FeP@NPC/NF-450). This catalyst exhibits exceptional HER activity in 0.5 M H2SO4and 1.0 M KOH solutions, with overpotentials of 68.3 mV and 106.1 mV at a current density of 10 mA cm−2, respectively. Furthermore, it demonstrates excellent stability with negligible decay over 48 h in both acidic and alkaline solutions. The outstanding hydrogen evolution catalytic performance of FeP@NPC/NF-450 is mainly due to the N, P co-doped carbon matrix, which safeguards the FeP nanoparticles from aggregation and surface oxidation. Consequently, this enhances the availability of active sites during the hydrogen evolution reaction (HER), leading to improved stability. Moreover, introducing nickel foam offers a larger specific surface area and enhances charge transfer rates. This study provides a reference method for preparing stable and highly active electrocatalysts for hydrogen evolution.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 16
·期 3
·364-375
·
IF 4.204
Wang Ruiqing,Cao Xiaolan,Sui Sheng,Li Bing,Li Qingfeng
The platinum nanowires have been verified to be a promising catalyst to promote the performance of proton exchange membrane fuel cells. In this paper, accurately controlled growth of nanowires in a carbon matrix is achieved for reducing Pt loading. The effects of formic acid concentration and reaction temperature on the morphology and size of the Pt nanowires, as well as their electrochemical performances in a single cell, are investigated. The results showed that the increase in the formic acid concentration results in a volcano trend with the length of Pt nanowires. With increasing reduction temperature, the diameter of Pt nanowires increases while Pt particles evolve from one-dimensional to zero-dimensional up to 40 °C. A mechanism of the Pt nanowires growth is proposed. The optimized Pt nanowires electrode exhibits a power density (based on electrochemical active surface area) 79% higher than conventional Pt/C one. The control strategy obtained contributes to the design and control of novel nanostructures in nano-synthesis and catalyst applications.
研究领域:
材料科学
·
能源工程
·
催化化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Shijiang Feng,Rong Qiang,Yulong Shao,Lei Rong,Fangjie Ren,Na Xiao,Siyuan Zhang,Zheng Guo,Caihong Chen,Qing Miao
The construction of hollow structures and the incorporation of metal nanoparticles have been shown to be two potential approaches to achieving high-performance microwave absorption. In this study, a hollow polyhedron material featuring an FeN/Fe-doped carbon matrix was synthesized by an acidification corrosion and pyrolysis strategy. The formation of heterojunctions, coupled with the design of hollow structures, significantly improved the dielectric loss capacity of the material. Furthermore, the incorporation of magnetic metal nanoparticles not only increased the magnetic loss but also enriched the loss mechanisms of the material, leading to an overall improvement in the magnetic loss. Under the synergistic effects of these factors, the material exhibited exceptional microwave absorption properties. In particular, at a material thickness of only 2.3 mm, the minimum reflection loss value of the FeN/Fe@HC nanocomposite reached −64.5 dB with an effective absorption bandwidth of 5.1 GHz. These results further highlight the importance of a hollow structure design and metal atom doping in improving microwave absorption performance.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2021
·
IF 17.881
Wei Xiao,Xifei Li,Bin Cao,Gang Huang,Chong Xie,Jian Qin,Huijuan Yang,Jingjing Wang,Xueliang Sun
The development of stable and durable phosphorus anodes for potassium-ion batteries (PIBs) has been retarded by a sluggish reaction kinetics and a notorious volume change with an ambiguous reaction mechanism upon cycling. Herein, the phosphorus nanoparticles have been rationally encapsulated into a commercial porous carbon through an evaporation-condensation strategy. Benefitted from the improved structural integrity/stability of electronically/ionically insulating phosphorus in a conductive/robust carbon matrix with abundant K + /electron migration channels, the phosphorus/carbon anode material with an appropriate phosphorus content (59.4 wt%) would achieve a large initial charging capacity of 744 mA h g −1 at 100 mA g −1 and a highly reversible capacity of 212 mA h g −1 at 3200 mA g −1 over 10,000 cycles with a superior rate capability of 287 mA h g −1 at 11,200 mA g −1 . Simultaneously, the electrochemical importance of phosphorus loading on potassium storage capability of derived phosphorus/carbon composites was also uncovered. Critically, the noticeable capacitive intercalation/extraction of K + in carbon nanostructure would significantly boost the charge storage process and promote the electrochemical performance of phosphorus/carbon anode. In terms of reaction mechanism for phosphorus/carbon anode, the active phosphorus would prefer to proceed a potassiation below 0.5 V upon discharging and a depotassiation below 1.0 V upon charging, accompanied by a reversible emergence/decomposition of K 4 P 3 . This novel study shedding lights on nanostructure design and mechanism clarification of phosphorus anode would contribute to the development of high-energy and long-life PIBs in practical applications.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Lu Wang,Hao Dang,Tianqi He,Rui Liu,Rui Wang,Fen Ran
Vanadium sulfide is considered a promising electrode material for achieving rapid lithium storage ascribing to its high specific capacity, unique crystal structure, and abundant valence states. Unfortunately, the structural collapse induced by volume expansion during charging and discharging is the key factor affecting rapid lithium storage. This article prepares composite materials with different morphologies through a strategy of decorating vanadium sulfide at carbon matrix. Among them, graphene oxide modified vanadium tetrasulfide composite materials with three-dimensional conductive networks exhibit excellent electrochemical performance . When the current density is 50 mA g −1 , the discharging specific capacity reaches 1, 560 mAh g −1 . After 2, 500 cycles at a high current density of 10, 000 mA g −1 , the specific capacity is about 188 mAh g −1 with charging time of approximately 70 s. GITT testing indicates that the order of magnitude of the logarithm of the initial diffusion coefficient is 10 −11 cm 2 s −1 owing to the three-dimensional porous conductive network, which not only shortens ion diffusion path but also provides more active sites for lithium-ion storage, rendering it a promising anode material for “fast-charging” lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 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）