Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 46
·23352-23359
·
IF 7.443
Wuxue Zhao,Sheng Han,Xiaodong Zhuang,Fan Zhang,Yiyong Mai,Xinliang Feng
A new series of B, N-containing cross-linked polymers (PPs-BN) were achieved via Sonogashira cross coupling. These polymers exhibit very high carbon yields of around 70–80% even at 800 °C, which allow them to be efficiently converted to B/N co-doped porous carbons after pyrolysis at high temperature under an inert atmosphere. The materials have been fully characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analyses, nitrogen sorption measurements and X-ray photoelectron spectroscopy, revealing their high contents of boron and nitrogen up to ∼3.21% and ∼5.72%, respectively, as well as porous structures with the largest specific surface area of 291 m2 g−1. Their CO2 capacities reached 3.25 mmol g−1 at 273 K under 1 atm. In addition, the very high selectivity for CO2/CH4 with a ratio of more than 5 : 1 at 298 K renders them applicable for gas separation and purification.
研究领域:
材料化学
·
环境科学
·
能源材料
·
物理化学
·
气体吸附与分离
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 31
·13906-13913
·
IF 4.197
Kunpeng Song,Peng Liu,Jingyu Wang,Lei Pang,Jian Chen,Irshad Hussain,Bien Tan,Tao Li
Novel dual-porous carbon-supported palladium nanoparticle (Pd NP) catalysts were prepared by sequential carbonization and reduction of microporous organic polymer-encaged PdCl2. The diverse pore structure of microporous organic polymers provides a reservoir for the palladium precursors and prevents Pd NPs from sintering during the carbonization and reaction. The microporous structure has a significant effect on the size and dispersion of palladium NPs. The average size of the Pd NPs (in the range of 4–6 nm) was tuned by changing the pore size distribution and the carbonization temperature. The resulting carbon-supported Pd NPs were characterized by TEM, BET, XRD, and XPS and the Pd loading was calculated by AAS. The encaged Pd NP catalysts prepared by this methodology exhibited outstanding stability and reusability in the Heck reaction and could be reused at least 10 times without appreciable loss of activity.
研究领域:
材料化学
·
纳米催化
·
有机合成方法学
·
多孔材料
·
绿色化学
✓ 已验证
DOI
高影响因子
Current Analytical Chemistry
·
2015
·Vol. 11
·期 3
·211-216
·
IF 1.132
Xiaojing Si,Ting Wang,Yaping Ding,Bingdi Liu,Liqiang Luo
In this study, multi-walled carbon nanotubes (MWCNTs) and vitamin B12 (VB12) were fabricated on the surface of glassy carbon electrode (GCE). This modified electrode (MWCNTs/VB12/GCE) was designed to determine p-hydroxyacetophenone (p-HYD) by square wave voltammetry. The MWCNTs/VB12 film was characterized by Electrochemical impedance spectroscopy and Fourier transform infrared spectroscopy, which exhibited excellent electrocatalytic activity toward p-HYD by using square wave voltammetry. The peak current was linear with the concentration of p-HYD over the range of 0.5 - 250 µM with the detection limit of 0. 15 µM (S/N = 3). Furthermore, this proposed sensor has also demonstrated good reproducibility, high stability and excellent anti-interference ability.
研究领域:
分析化学
·
电化学
·
生物传感器
·
药物分析
·
纳米材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 43
·期 12
·9327-9333
·
IF 2.986
Nan Zhou,Shengxiong Huang,Tao Hong,Wei Luo,Yun Tian,Xiangyang Lu,Zhi Zhou
In this paper, LiTi 2 (PO 4 ) 3 @carbon composite as anode for aqueous lithium ion battery has been successfully synthesized by in-situ carbon coating method using oxalic acid and glucose as double carbon sources. XRD results confirm the rhombohedral NASICON-type LiTi 2 (PO 4 ) 3 structure of the as-prepared composite. The LiTi 2 (PO 4 ) 3 @carbon composite using double carbon sources (LTP-OG-10) disperses well, and the coated carbon layer has the appropriate thickness of 3–7 nm, which result in proper balance of the good electrical conductivity and the fast kinetics of diffusion of lithium ions . LTP-OG-10 exhibits better electrochemical performance compared with those using oxalic acid (LTP-O) or glucose (LTP-G) single carbon source. LTP-OG-10 anode delivers the discharge capacity of 112.5 mA h g −1 , 96.8 mA h g −1 , and 54.2 mA h g −1 at 0.2 C, 5 C and 20 C, respectively, much larger than that of LTP-O and LTP-G. Moreover, LTP-OG-10 demonstrated excellent cycling performance, with the capacity retention of 71.1% after 400 cycles at 0.2 C, 22.9% higher than that of LTP-G. The good electrochemical properties of LTP-OG-10 is mainly ascribed to the increase of defects, high-quality and appropriate thickness of carbon layer. Our study reveals that preparing LiTi 2 (PO 4 ) 3 @carbon composite using double carbon sources is an efficient approach to enhance its electrochemical properties.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机非金属材料
·
功能材料
✓ 已验证
DOI
高影响因子
Energy Technology
·
2022
·Vol. 11
·期 11
·2200376
·
IF 4.149
Peng Xu,Decheng Zhao,Shupei Liu,Jinghui Ren,Jian Zhou,Ning Wang,Zhoulu Wang,Xiang Liu,Yutong Wu,Yi Zhang
Selenium cathodes are expected to become next-generation energy storage materials due to their high electronic conductivity and volumetric capacity. However, their commercial applications are hindered by polyselenides dissolution and low Se utilization. Herein, a biomass compound, namely lychee seed, is used as a sustainable precursor to design hierarchically porous carbon by a single-step carbonization activation method. With a unique hierarchical porous structure, the lychee seed–derived activated carbon (LSDAC) used to encapsulate selenium delivers a reversible capacity of 446 mA h g −1 at 2 C and 291 mA h g −1 at 5 C after 1000 cycles. The Se/LSDAC electrodes show the most favorable fast-charging and good cycling behavior compared to the previously reported biomass-based carbon materials. By increasing the Se area loading to 9.5 mg cm −2 , the Se/LSDAC cathode maintains an areal capacity of 3.7 mA h cm −2 (3.2 mA cm −2 areal current density) after 80 cycles. High Se loading and economical and fast-charging cathode designs in Li–Se batteries are inspired.
研究领域:
电化学储能
·
材料科学
·
纳米能源材料
·
可持续能源技术
·
先进电池技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
K. Huang,K. Bi,J.C. Xu,C. Liang,S. Lin,W.J. Wang,T.Z. Yang,Y.X. Du,R. Zhang,H.J. Yang,D.Y. Fan,Y.G. Wang,M. Lei
Novel nanocomposites of spherical graphite-carbon encased tungsten carbide (GC-WC) are synthesized by solid state reaction with melamine and WO 3 as precursors under N 2 atmosphere. The diameters of the GC-WC composites range from 50 to 200 nm and the WC nanoparticles inside with an average size of ca. 15 nm distribute uniformly. The characterization results indicate that the GC-WC is composed of few layers of graphite carbon and WC nanoparticles with high crystallization and purity. Moreover, the electrocatalytic performance of GC-WC for the oxygen reduction reaction (ORR) in alkaline medium is further investigated by cyclic voltammetry (CV), rotating disk electrode (RDE) and chronoamperometry test with or without 3 M methanol. The results show that GC-WC has a considerable performance for ORR in the view of activity, stability and methanol tolerance, which may further used as proper supports for noble-metal based ORR catalysts in alkaline fuel cell . The synergetic interaction between the carbide nanoparticles and graphite carbon, which means that the surface graphite carbon layers are activated by WC nanoparticles for ORR and in turn protect inner WC from highly oxidizing environments has also been verified.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源材料
·
催化化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 23
·5675
·
IF 4.2
Xueli Zhang,Linhui Jia,Yu Liu,Ziqi Wang,Jumiao Qin,Qiuhong Wang,Xiao Zhao,Ming Zhong,Jianfeng Lang,Guangri Xu,Yanbing Wu,Chengxing Cui
Microbial fuel cell (MFC) can degrade pesticide wastewater and recovery energy simultaneously, and the activated carbon (AC) air cathode has great prospects for practical application. However, insufficient active sites and the limitation of multi-step electron transfer for oxygen reduction reaction (ORR) requires that AC should be modified by highly efficient electrocatalysts. Herein, busing the confinement effect of carbon-encapsulated metal and hollow carbon, we designed a unique ORR catalyst of Fe-Fe3O4-NC through utilizing the 2D leaf-like nanoplates of Zn-ZIF-L to load Prussian blue (PB) particles. The volatilization of low-boiled Zn and the catalysis of iron compounds led to the formation of confined walls of hollow carbon shell and carbon-encapsulated Fe/Fe3O4particles on N-doped carbon substrate. Multivalent iron, a large surface area (368.11 m2·g−1), N doping, a heterojunction interface, and the confinement effect provided all the Fe-Fe3O4-NC-modified AC air cathodes with excellent ORR activity. The optimal samples of AC-Fe-Fe3O4-NC-3 achieved a peak power density of 1213.8 mW·m−2, demonstrating a substantial 82.8% increase over that of the bare AC. Furthermore, its efficiency in glyphosate removal reached 80.1%, surpassing the 23.2% of the bare AC. This study offers new ideas in constructing composite confined structures and the as-designed Fe-Fe3O4-NC is a promising modification candidate for the commercial adoption of AC air cathodes.
研究领域:
环境科学
·
能源技术
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 8
·1-7
·
IF 2.8
Wu Fang,Pu Zejun,Hou Hongbo,Li Xianyong,Zhu Rongli,Wang Xu,Yu DaYang,Zhong Jiachun
Bioderived polycarbonate (ISB-PC) was synthesized via transesterification and polycondensation of isosorbide (ISB) and diphenyl carbonate (DPC) using lithium acetoacetone as a catalyst. The resulting ISB-PC exhibited high glass transition temperatures similar to bisphenol A polycarbonate (BPA-PC) and was thermally stable up to 350 ℃. The incorporation of isosorbitol into the polymer chain imparted an improved mechanical property of ISB-PC, such as a higher bending and tensile modulus and higher elongation at break. ISB-PC can be readily cast into transparent films with a tensile strength of 73.3 MPa and a tensile modulus of 534 MPa. ISB-PC displayed high UV transmittance and possessed blue fluorescence under UV irradiation. At the same time, ISB-PC also has strong anti-yellowing ability.
研究领域:
材料科学
·
化学工程
·
聚合物科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Tao Wang,Wei Yu,Fei Liu,Mengxiang Fang,Muhammad Farooq,Zhongyang Luo
In this study, three different nanoparticles—SiO2, TiO2, and Al2O3—were employed to enhance the CO2 gas absorption by monoethanolamine (MEA) solvent. It is observed that, with increased solids loading, the total mass-transfer enhancement has a tendency to be dominated by the bubble breaking effect. It is concluded that nanoparticles result in an increased CO2 absorption rate of >10%. On the other hand, nanoparticles exhibit much more attractive impact on CO2 desorption. Under the same desorption extent, solvent with 0.1 wt % TiO2 nanoparticles saved 42% desorption time, compared to that without nanoparticles. Under higher heat flux density, more input heat would be supplied to the heat of desorption, rather than the heat of water evaporation, which is due to the enhancement of desorption rate by nanoparticles. The issue of particle aggregation was also investigated by analyzing the size distribution of nanoparticle clusters and zeta potential of MEA solvents.
研究领域:
化学工程
·
环境科学
·
能源技术
·
纳米材料学
·
传热传质学
✓ 已验证
DOI
高影响因子
Small
·
2015
·Vol. 11
·期 37
·4959-4969
·
IF 8.368
Wenjing Qian,Jingyue Zhu,Ye Zhang,Xiao Wu,Feng Yan
The one-step synthesis of porous carbon nanoflakes possessing a 3D texture is achieved by cooking (carbonization) a mixture containing two condiments, sodium glutamate (SG) and sodium chloride, which are commonly used in kitchens. The prepared 3D porous carbons are composed of interconnected carbon nanoflakes and possess instinct heteroatom doping such as nitrogen and oxygen, which furnishes the electrochemical activity. The combination of micropores and mesopores with 3D configurations facilitates persistent and fast ion transport and shorten diffusion pathways for high-performance supercapacitor applications. Sodium glutamate carbonized at 800 °C exhibits high charge storage capacity with a specific capacitance of 320 F g −1 in 6 m KOH at a current density of 1 A g −1 and good stability over 10 000 cycles.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 38
·21460-21471
·
IF 2.936
Zhongzheng Zhang,Nannan Sun,Wei Wei,Yuhan Sun
A new strategy for controlled synthesis of a MOF composite with a core–shell structure, ZIF-8@resorcinol–urea–formaldehyde resin (ZIF@RUF), is reported for the first time through in situ growth of RUF on the surface of ZIF-8 nanoparticles via an organic–organic self-assembly process by using hexamethylenetetramine as a formaldehyde-releasing source to effectively control the formation rate of RUF, providing the best opportunity for RUF to selectively grow around the nucleation seeds ZIF-8. Compared with the widely reported method for MOF composite synthesis, our strategy not only avoids the difficulty of incorporating MOF crystals into small pore sized materials because of pore limitation, but also effectively guarantees the formation of a MOF composite with a MOF as the core. After carbonization, a morphology-retaining N-doped hierarchical porous carbon characterized by its highly developed microporosity in conjunction with ordered mesoporosity was obtained. Thanks to this unique microporous core–mesoporous shell structure and significantly enhanced porosity, simultaneous improvements of CO2 adsorption capacity and kinetics were achieved. This strategy not only paves a way to the design of other core–shell structured MOF composites, but also provides a promising method to prepare capacity- and kinetics-increased carbon materials for CO2 capture.
研究领域:
材料化学
·
环境科学
·
纳米材料
·
多孔材料
·
碳捕集
·
物理化学
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yang Xia,Liyue Yu,Chengwei Lu,Jing Zhu,Zhen Xiao,Jun Zhang,Chu Liang,Hui Huang,Yongping Gan,Wenkui Zhang
Monoclinic Li 3 V 2 (PO 4 ) 3 (LVP) fulfills safety requirements including superior chemical and thermal stabilities since the oxygen atoms are firmly anchored in PO 4 3− units, however the low intrinsic electronic conductivity strictly limits its electrochemical performance . Herein, to overcome this problem, a rationally designed passion fruit-like LVP@C/CNT composite constructed with LVP grains as seeds, carbon matrix as pulp, and carbon nanotubes (CNTs) as filaments, has been prepared via a facile spray pyrolysis method. In such unique biomimetic structure, carbon matrix encases LVP to reduce its particle size, which is beneficial to shorten ion pathways; Porous structure scattered around carbon matrix facilitates the rapid penetration of electrolyte; 3D CNT networks afford high-speed electron conduction and remarkable structural stability by forming the bridges between LVP grains. Owing to the multiple merits of this biomimetic structure, the rationally designed LVP@C/CNT composite with 3 wt% CNT exhibits high reversible capacity, superior cyclic stability and remarkable rate capability.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米复合材料
·
锂离子电池
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）