JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 12
·7762-7772
·
IF 2.2
Dong Ziming,Dou Jiali,Ye Lin,Jiang Xihuan,Jiao Luwen,Liu Xiaojie,Wang Song
Slow carbonization (SC) and fast carbonization (FC) methods were applied and compared during the preparation of carbon materials using potassium citrate as raw material. The porous carbon material obtained by the SC method (SCPC800) had a slightly higher specific surface area than that obtained by the FC method (FCPC800). When SCPC800 was applied in the construction of a zinc–ion capacitor (ZIC), the obtained ZIC displayed a high mass specific capacitance (MSC) value of 309.5 F g −1 and a specific energy of 155.2 Wh kg −1 at the 0.2 A g −1 current density. FCPC800 showed similar electrochemical performance as SCPC800. The ZIC with the FCPC800 as electrode exhibited an MSC value of 300.7 F g −1 with a specific energy of 150.8 Wh kg −1 at the 0.2 A g −1 current density. Meanwhile, the SCPC800 and FCPC800-based ZICs showed good rate capability and cycle stability. Compared with the SC method, the FC method showed a significant advantage in reducing sample preparation time, which can greatly increase the preparation efficiency and reduce energy consumption. Therefore, as an efficient method, the FC method showed broad application prospects in the preparation of carbon materials for ZIC. Graphical Porous carbon materials prepared from potassium citrate for zinc-ion capacitor
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Zhenxia Zhao,Dan Qin,Sha Wang,Guohua Chen,Zhong Li
A high-rate sulfur/carbon cathode is prepared by using high conductive hierarchical porous carbon-carbon fiber weave-structured (HPC-CF) materials as carbon host to disperse sulfur. Sulfur is infiltrated into porous carbon with meso/micropores by using an improved vapor-melting adsorption method, which aims to enhance sulfur dispersion and interaction with carbon host. Meanwhile, carbon fiber with weaved structure can connect the dispersed micron S/HPC particles on the current collector. As a result, a highly conductive network around the sulfur particles finally forms in the sulfur/carbon cathode. Results show that improved vapour-melting method can efficiently enhance the sulfur dispersion and interaction with carbon host. Electrochemical measurements show that both of the rate capacity and cycle stability of the sulfur/carbon cathode are significantly improved. It delivers a very high initial discharge capacity of 1692.9 mAh g −1 at 0.1 C, and maintains 1030 mAh g −1 after 130 cycles at 0.5 C. Furthermore, the weave-structured HPC-CF carbon materials increases the conductivity effectively, which enhances the rate performance of the prepared S/HPC-CF cathode. It shows 670.8 mAh g −1 at the first cycle and remains 520 mAh g −1 after 200 cycles at 6.0 C with an average coulombic efficiency of 97.8%. The excellent cycle and rate performance of the prepared S v-m /HPC-CF can be attributed to the high cathode conductivity, high sulfur utilization and strong interaction between sulfur and the HPC-CF materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 16
·3862
·
IF 4.2
Guangyue Shi,Xiaolei Sun,Yao Liu
Percolating composites exhibiting negative permittivity have garnered considerable attention due to their promising applications in the realm of electromagnetic shielding, innovative capacitance devices, coil-less inductors, etc. Nano carbon powder/polyvinylidene fluoride (CP/PVDF) percolating composites were fabricated that exhibit Drude-type negative-permittivity behavior upon reaching the CP percolation threshold. This phenomenon is attributed to the formation of a plasmonic state within the interconnected CP network, enabling the delocalization of electrons under the alternating electric field. Furthermore, a significant (nearly two orders of magnitude) increase in the conductivity of sample is observed at a CP content of 12.5 wt%. This abrupt change coincides with the percolation phenomenon, suggesting a transition in the conduction mechanism. To elucidate this behavior, comprehensive analyses of the phase composition, microstructure, AC conductivity, and relative permittivity were performed. Additionally, the sample containing 5 wt% CP exhibits a remarkably high permittivity of 31.5, accompanied by a relatively low dielectric loss (tanδ < 0.2). The findings expand the potential applications of PVDF, while the fabricated percolating composites hold promise for electromagnetic shielding, antennas, and other electromagnetic devices.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ruoyu Chen,Hongbin An,Jie Zhan,Saisai Li,Aiqin Mao,Haiming Wen
A high entropy carbide (TaNbTiV)C was fabricated via spark plasma sintering of high entropy powders that were prepared using a molten salt method. The as-fabricated high entropy carbide was then investigated for its high-temperature oxidation behavior at 850 °C, under atmospheres with three different oxygen contents (20 vol%, 40 vol%, and 60 vol%). After the high-temperature oxidation process, the main phases observed in all the specimens were incompletely oxidized phase (Nb x Ti 1-x )C y O 2-y and oxides (Nb 0.5 Ta 0.5 ) 2 O 5 , TiO 2 , and Nb 2 O 5 . Importantly, the thickness of the oxide layer initially increased and then decreased as the oxygen content increased. When the oxygen content reached 40 vol%, the ceramic displayed severe oxidation behavior with observed thicker of the oxide layer, as well as numerous pores and cracks in the oxide layer. This work provides new insights into the oxidation behavior of high entropy carbides.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2014
·
IF 1.178
Yong Xiao,Chao Long,Ming-Tao Zheng,Han-Wu Dong,Bing-Fu Lei,Hao-Ran Zhang,Ying-Liang Liu
High-performance supercapacitor electrode materials are prepared from the commercially available activated carbon (AC) through a facile and low-cost chemical activation method. The obtained results show that AC activated by KOH with an alkali/carbon ratio of 6/1 (ACK6) possesses a specific surface area of 3405 m 2 /g, a large pore volume of 2.01 cm 3 /g, and exhibits the highest initial specific capacitance of 335 F/g at the current density of 0.5 A/g in 6 mol/L KOH, and 85% coloumbic efficiency for 5000 cycles at 20 mV/s.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Progress in Natural Science-Materials International
·
2024
·
IF 4.8
Xue Deng,Siyang Wang,Qianqian Ren,Xintong Yan,Wenbo Zhao,Jianzhong Cui,Shi Hu
Energy transition towards net-zero society calls for utilization of renewable power to drive CO 2 conversion in an efficient electrochemical way. The development of a commercial CO 2 electrolyzer with positive tech-eco effect calls for active and durable electrocatalysts. High-loading gold on carbon (Au/C) with reduced particle size is the prerequisite for the highly-selective and highly energy-efficient CO production in such a CO 2 electrolyzer, but a scalable synthetic method is missing. With combined control of ligand, substrate and pH value, Au/C catalysts with particle size within 5 nm and metal loading of 40 wt% and 60 wt% are synthesized on low and high surface-area carbon, respectively. We also provide a thorough investigation of the effect of the ligand type, surface charge of gold nanoparticles (Au NPs) and surface area of carbon substrate on the loading limit of Au/C.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Yan Li,Guangyu Chen,Jie Lin,Liuqing Huang,Chentong Zhang,Xuetao Luo
TC4 (Ti–6Al–4V) nanoparticles (TC4NPs) and silicon nanoparticles (SiNPs) with a median size of 146 and 51 nm were prepared by sand milling from scrap produced by refining silicon and TC4. The SiNPs and TC4NPs are mixed, carbonized, and leached in different proportions to obtain Si@C/TiO2@C/Hollow-C anode materials. The special structure of the anode materials provided more space for the volume expansion of silicon. The anatase TiO2 in TC4NPs relieves the volume expansion and reduces the transfer impedance, and the lithiated TiO2 can promote the electrical conductivity of the Si@C/TiO2@C/Hollow-C anode during the charge/discharge process. Furthermore, the Si@C/TiO2@C/Hollow-C (SiNPs/TC4NPs = 2:1) electrode delivers excellent rate performance; after cycling at a series of higher current densities, 92% of the original level of the reversible capacity can be maintained. The Si@C/TiO2@C/Hollow-C (SiNPs/TC4NPs = 2:1) anode retains 558 mA h·g–1 after 400 cycles with a large current density of 1000 mA·g–1. The synthesis method of the Si@C/TiO2@C/Hollow-C anode is a low-cost, facile, and nontoxic process, endowing it with the potential for application as energy materials for mass production.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2013
·Vol. 5
·期 20
·5785-5791
·
IF 1.855
Yangyang Gao,Liping Guo
A novel theophylline (TP) sensor was developed using a single walled carbon nanotube–large mesoporous carbon/Nafion composite modified glassy carbon electrode (SWCNT–LMC/Nafion/GCE). The morphology of the SWCNT–LMC microstructure was characterized by transmission electron microscopy (TEM) and the surface of the modified electrode was characterized by cyclic voltammetry (CV). The results showed enhanced electrochemical reactivity and voltammetric response of TP. Under the selected conditions the peak current was linear with TP concentration from 0.3 to 38.0 μM with a detection limit of 0.08 μM (S/N = 3), as determined by differential pulse voltammetry (DPV). The SWCNT–LMC/Nafion/GCE was successfully applied for the determination of TP in human blood serum and urine samples with good recoveries.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2024
·
IF 2.7
Tongmengyao Jin,Jingyuan Ding,Xiaobao Li
To enhance the hydrophobicity of polylactic acid (PLA) composite, a novel alkali lignin/basic magnesium carbonate (AL-BMC) was prepared by carbon dioxide carbonization method. The interaction forces between AL and BMC, the morphology of AL-BMC, and the effect of the additive amount of AL-BMC on the hydrophobicity of PLA/alkali lignin/basic magnesium carbonate (PLA/AL-BMC) composites were investigated. The results of Fourier transform infrared spectra, X-ray diffraction pattern, and scanning electron microscope showed that there were hydrogen bonds between AL and BMC, the morphology of AL-BMC composites showed a flower-like structure, and the aggregation of basic magnesium carbonate was effectively inhibited by the hydrogen bonds between AL and BMC. The water contact angles of PLA/AL-BMC significantly increased with the addition of AL-BMC. Specifically, when the additive amount of AL-BMC was 20 %, the water contact angle of PLA/AL-BMC was 97.4°, which was higher than that of PLA/AL by 57.1 %. Therefore, the hydrophobicity of PLA/AL were effectively enhanced by the addition of AL-BMC composite filler. This study presents a novel strategy for enhancement of the hydrophobicity of PLA composite, utilization of lignin, and conversion of carbon dioxide.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Shuaijun Yang,Mei Wang,Yetong Lv,Huilin Sheng,Yexia Qin
Oxidation resistance is crucial to the potential applications of high-entropy carbides (HECs) at elevated temperatures. Here, we realize the exploration of (Hf, Ta, Zr, Cr)C high-entropy carbides (HEC-TM, TM = Hf, Zr, Ta, and Cr) with good oxidation resistance by optimizing their compositions. To be specific, 21 kinds of HEC- x TM ( x = 0–25 mol%) samples are fabricated by a high-throughput ultrafast high-temperature sintering technique, followed by oxidation testing at 1673 K for 30 min. Among all the HEC samples, the as-fabricated HEC-0Zr samples are proved to possess the best oxidation resistance with an oxidation depth of only 53 µm. Further study on isothermal oxidation kinetics demonstrates that the as-fabricated HEC-0Zr samples follow a linear oxidation law. The good oxidation resistance of the as-fabricated HEC-0Zr samples is believed to result from the (Ta, Me) 2 O 5 phase with a low melting point, which can promote the densification of the oxide layer. This research opens up a new way for efficiently discovering new HECs for extreme applications.
研究领域:
材料科学
·
高温材料
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2024
·
IF 16.8
Shanyong Chen,Tao Luo,Xiaoqing Li,Kejun Chen,Qiyou Wang,Junwei Fu,Kang Liu,Chao Ma,Ying-Rui Lu,Hongmei Li,Kishan S. Menghrajani,Changxu Liu,Stefan A. Maier,Ting-Shan Chan,Min Liu
Metal-nitrogen-carbon single-atom catalysts (SACs) have emerged as promising candidates for electrocatalytic CO 2 reduction reaction. However, the perpendicular d z 2 orbital within planar metal site mainly interacts with *COOH, resulting in inferior CO 2 activation. Inspired by reaction-driven active configuration, here we propose to upshift nickel single-atom away from nitrogen-carbon substrate, prominently promoting the interaction between CO 2 and other d orbitals besides d z 2 . Theoretical and experimental analyses reveal that upshifting nickel site away substrate induces d xz , d yz , and d z 2 to hybridize with CO 2 , expediting CO 2 conversion to *COOH. The planar and out-of-plane Ni-N sites are formed on carbon nanosheet (Ni 1 -N/C NS ) and curved nanoparticle (Ni 1 -N/C NP ), respectively, which is verified by X-ray absorption fine structure spectroscopy. Impressively, the Ni 1 -N/C NP presents CO Faradaic efficiency of 96.4 % at 500 mA cm −2 and energy conversion efficiency of 79.8 % in flow cell, outperforming Ni 1 -N/C NS and most SACs. This work highlights the simulation of reaction-driven active sites for efficient electrocatalysis .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2024
·
IF 3.9
Huiyu Yang,Xiaohua Cheng,Bin Lu,Yahui Zhou,Xin Liu,Shuai Peng,Bo Deng
Highly reflective substrate surfaces produce strong reflections of interfering and scattered light, which reduces the saturation and brightness of structural colors constructed by photonic crystals. Amorphous SiO 2 photonic crystals of 250–360 nm were synthesized using the Stober method, and then synergized with strongly light-absorbing carbon nanoparticles to construct a variety of structural colors on the surface of white cotton fabrics by electrostatic self-assembly. The vividness and stability of the structural colors on the surface of black cotton fabrics were also compared. The results showed that the structural color cotton fabrics had excellent washing fastness and abrasion fastness. The microscopic morphology of SiO 2 microspheres and structured color surfaces were investigated by Scanning electron microscopy (SEM). The compositional structure of SiO 2 microspheres was analyzed by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The color quality of structured color cotton fabrics was investigated using reflectance spectra and K/S values.
研究领域:
材料科学
·
纺织工程
·
光学
✓ 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）