VACUUM
·
2019
·
IF 2.515
Man Liu,Zhihong Qin,Xiaoqin Yang,Zhe Lin,Tong Guo
A smooth and defectless carbon sheet with thickness of 1–2 μm was prepared by loose medium component from coal. Then, porous carbon sheet materials were prepared by activation of the carbon sheet using KCl and KOH under 750 °C and N 2 atmosphere. Such materials have lattice defect and porous structure which were verified by emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman and N 2 adsorption-desorption. Their electrochemical performances were studied by cyclic voltammetry curves and constant current charge-discharge curves. The results showed that varing the content of KCl could control the distribution of the mesopore so as to change the specific capacitance. When carbon/KCl/KOH was at a mass ratio of 1:3:4, the specific capacitance reached up to 346 F g −1 at the current density of 0.1 A g −1 with high energy density and power density of 12 Wh kg −1 and 25 W kg −1 , respectively. The high specific capacitance of this material was corresponded to its porous structure with high specific surface area of 3627 m 2 g −1 . Based on the above structure features and performance results, this paper supplies a brand new and promising way for synthesis of supercapacitor 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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Huimin Zhou,Muhammad Awais Naeem,Pengfei Lv,Jin Zhang,Zengyuan Pang,Lei Luo,Yibing Cai,Xin Xia,Qufu Wei
Carbon-coated SnO 2 composite nanofibers has been considered as an efficient way to alleviate the enormous volume change problem of tin-based anodes for lithium ion batteries (LIBs). Herein, porous carbon/SnO 2 nanofibers were prepared via single-needle electrospinning which was followed by carbonization treatment. The procedure involved two categories of precursors of SnO 2, stannic chloride pentahydrate and stannic acetate, whereas former was fully dissolved while later was partially dissolved in solvent, leading to different pore distribution in cooperating with thermal decomposition of polymethyl methacrylate. The pores generated from stannic chloride pentahydrate/polymethyl methacrylate system were randomly distributed on the surface of nanofibers. In the case of stannic acetate/polymethyl methacrylate derived composites, the thermolysis of polymer left multichannels within the nanofibers coupled with SnO 2 nanoparticles . Galvanostatic charge/discharge was carried out to evaluate them as anode materials for LIBs. It was found that multichannel carbon/SnO 2 nanofibers with large specific surface area (34.97 m 2 /g) achieved better rate capability and stable capacity retention of 89.9% after 50 cycles. The longitudinally aligned pores facilitated lithium diffusion and transference, which avoided nonuniform deposition and separation of lithium ions , thereby further enhancing the stability during the discharge/charge process.
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
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Liujie Xu,Yi Li,Mingzheng Liao,Qingbin Song,Chao Wang,Jiahong Weng,Ming Zhao,Ningbo Gao
Waste cooking oil (WCO) energy development offers an effective method for producing renewable fuels , enabling simultaneous resource recovery and pollution reduction. This study aims to develop a novel bimetallic Fe(Ni)-Ru/ZSM-5 catalyst toward H 2 -rich syngas production from WCO. The results show that Fe-Ru/ZSM-5 produced a higher maximum H 2 yield (84.05 μmol·g cat. −1 ·s −1 ) than did Ni-Ru/ZSM-5 (41.76 μmol·g cat. −1 ·s −1 ) when fed at a 50 L/min rate at an optimal temperature of 700 °C. Fe-Ru/ZSM-5 presented a more prolific microporous distribution, whose structure contributes to the diffusion of the short-chain hydrocarbon intermediate reactants to enhance hydrogen production . Fe(III) can help to improve the conversion ratio of benzene and the anti‑carbon deposition capability of the catalyst. The dealumination and oxidation decreases the stability of the catalyst and may lead to inactivation. Furthermore, this study discusses the mechanism of bimetallic-loaded catalysts combining noble metals with transition metals in WCO pyrolysis . The results point to effective new approaches to increase H 2 production through the catalytic pyrolysis of WCO.
研究领域:
化学工程
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环境科学
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能源技术
·
催化
✓ 已验证
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2023
·Vol. 20
·期 5
·4383
·
IF 4.614
Zheng Li,Yuwei Feng,Xia Qu,Yantao Yang,Lili Dong,Tingzhou Lei,Suxia Ren
Lignin is an ideal carbon source material, and lignin−based carbon materials have been widely used in electrochemical energy storage, catalysis, and other fields. To investigate the effects of different lignin sources on the performance of electrocatalytic oxygen reduction, different lignin−based nitrogen−doped porous carbon catalysts were prepared using enzymolytic lignin (EL), alkaline lignin (AL) and dealkaline lignin (DL) as carbon sources and melamine as a nitrogen source. The surface functional groups and thermal degradation properties of the three lignin samples were characterized, and the specific surface area, pore distribution, crystal structure, defect degree, N content, and configuration of the prepared carbon−based catalysts were also analyzed. The electrocatalytic results showed that the electrocatalytic oxygen reduction performance of the three lignin−based carbon catalysts was different, and the catalytic performance of N−DLC was poor, while the electrocatalytic performance of N−ELC was similar to that of N−ALC, both of which were excellent. The half−wave potential (E1/2) of N−ELC was 0.82 V, reaching more than 95% of the catalytic performance of commercial Pt/C (E1/2= 0.86 V) and proving that EL can be used as an excellent carbon−based electrocatalyst material, similar to AL.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）