Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Bin Ren,Yuelong Xu,Lihui Zhang,Zhenfa Liu
A novel, carbon-doped graphitic carbon nitride (C C 3 N 4 -20) was used for methylene blue (MB) removal from an aqueous solution. In dye adsorption experiments, C C 3 N 4 -20 showed a high MB adsorption efficiency due to its extended π-conjugation system and porous structure, the maximum adsorption capacity of C C 3 N 4 -20 for MB was 57.87 mg g −1 , when the initial concentrations of MB were 20 mg L −1 . A Langmuir model fit the MB adsorption isotherm of C C 3 N 4 -20, and a pseudo-second-order kinetic model fit the adsorption kinetics. The MB adsorption process on C C 3 N 4 -20 is physical and mainly via electrostatic attraction and π–π interactions.
研究领域:
环境科学
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材料科学
·
物理化学
·
污染控制
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功能材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Qianxu Ye,Juanjian Ru,Jinhui Peng,Guo Chen,Ding Wang
Herein, the multiporous MnO/N-doped carbon (MnO/NC) composite based on the abundant and inexpensive electrolytic manganese dioxide were fabricated through a facile microwave-assisted carbonthermal reduction, combined with a subsequent in-situ polymerization of polydopamine onto MnO along with thermal treatment. As an anode material, it retains a reversible capacity of 770.5 mAh g −1 at 300 mA g −1 and high Coulombic efficiency of 99% over 500 cycles, superior than those values of the pure multiporous MnO alone. The impressive performance is attributed to the splendid structure stability contributed by well-connected three-dimensional porous configuration and the enhanced reaction kinetics as well as electrical conductivity incurred by N-doped carbon layer with multiple type nitrogen.
研究领域:
材料科学
·
电化学
·
纳米材料
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能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
Nano Energy
·
2017
·
IF 12.343
Qizhen Zhu,Qian Zhao,Yabin An,Babak Anasori,Haoran Wang,Bin Xu
Lithium-sulfur (Li-S) batteries are one of the most promising energy storage systems with high energy density . However, they suffer from fast capacity fading due to the shuttle of the dissolved polysulfides . Using small sulfur molecules (S 2–4 ) as cathodes can avoid the shuttle problem, but the preparation of ultra-microporous carbon to encapsulate S 2–4 is challenging. Here, we report a Li-S battery with an excellent cycling performance by using a unique ultra-microporous carbon (UMC) with a uniform pore size of 0.55 nm. The UMC was synthesized from PVDF via a facile pyrolysis process to only accommodate small S 2–4 molecules and eliminate large S 8 molecules. This S/UMC composite electrode is compatible with the carbonate-based electrolyte used in Li-S batteries. The resulting battery shows a typical discharging profile with only one long potential plateau because the reductions from cyclo-S 8 to dissolved polysulfides and consequence shuttle problem are avoided. The S/UMC composite retains a capacity of about 852 mAh g −1 and Coulombic efficiency approaching 100% after 150 cycles at 0.1 C and delivers a long-term cycling at 1 C for 1000 cycles with only around 0.03% capacity loss per cycle. We also tested this S/UMC composite electrode in Na-S systems and observed similar electrochemical behaviour. These results indicate that the S/UMC composite is a promising candidate as an electrode material in Li-S and Na-S batteries and related systems.
研究领域:
材料科学
·
电化学
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能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 31
·15310-15319
·
IF 9.931
Zhou Chen,Ting-Ting Fan,Xiang Yu,Qiu-Ling Wu,Qiu-Hui Zhu,Li-Zhong Zhang,Jian-Hui Li,Wei-Ping Fang,Xiao-Dong Yi
Efficient and economical photocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are required to replace expensive metal-based catalysts used in water splitting devices. Herein, we have developed an inexpensive route to synthesize a carbon-rich graphitic carbon nitride (C-rich g-C3N4) with both nitrogen vacancies and a porous structure, which, as a highly efficient photo-induced water splitting catalyst, can meet current demands. The effects of the porous structure, nitrogen vacancies and rich amount of carbon on the electronic band structure and charge transport of g-C3N4 are systematically elucidated. The C-rich g-C3N4 can not only effectively enhance the absorption of visible light, but can also improve the majority carrier mobility and promote photoelectron transport through the defect-induced mid-gap and multiple conductive carbon rings, thus synergistically elongating the diffusion length and lifetime of the photocarriers. Importantly, the metal-free C-rich g-C3N4 photocatalyst not only demonstrates a higher solar-driven hydrogen production performance, which is over 20.5 times that of pristine g-C3N4, but also exhibits an outstanding stability with minimal loss of catalytic activity.
研究领域:
材料科学
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光催化
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能源化学
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纳米材料
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半导体物理
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环境功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 17
·12115-12122
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IF 2.993
Zhang Yixin,Shen Zhimin,Yu Yifeng,Liu Lei,Wang Guoxu,Chen Aibing
Polystyrene, one of the classical plastic, has caused serious environmental problems due to overuse and inability to recycle effectively. Transforming it into functional carbon materials is one of the effective ways to recycle polystyrene and other waste plastics, which has drawn the attention. In this study, we have developed a facile and efficient method for the preparation of three-dimensional (3D) network structure porous carbon (PC) via the Friedel–Crafts reaction with waste polystyrene serves as carbon source. Notably, the constructed carbonyl (–CO–) cross-linking bridges between the linear polystyrenes provide the resulting hierarchical porous polystyrene with a high cross-linking density and amounts of oxygen atoms to achieve the carbonizability of cross-linking polystyrene framework. Moreover, silica particles created more porous structure for carbon material. The prepared PC showed large specific surface area and 3D porous structure and exhibited good capacitance and electrochemical stability as electrode materials for supercapacitor.
研究领域:
材料科学
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环境科学
·
能源化学
·
高分子化学
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电化学
✓ 已验证
DOI
高影响因子
IONICS
·
2016
·Vol. 23
·期 3
·575-583
·
IF 2.119
He Zhangxing,Jiang Yifan,Sun Dan,Dai Lei,Wang Haiyan
Inferior rate capability is a big challenge for LiTi 2 (PO 4 ) 3 anode for aqueous lithium-ion batteries. Herein, to address such issue, we synthesized a high-performance LiTi 2 (PO 4 ) 3 /carbon/carbon nanotube (LTP/C/CNT) composite by virtue of high-quality carbon coating and incorporation of good conductive network. The as-prepared LTP/C/CNT composite exhibits excellent rate performance with discharge capacity of 80.1 and 59.1 mAh g −1 at 10 C and 20 C (based on the mass of anode, 1 C = 150 mA g −1 ), much larger than that of the LTP/C composite (53.4 mAh g −1 at 10 C, and 31.7 mAh g −1 at 20 C). LTP/C/CNT also demonstrates outstanding cycling stability with capacity retention of 83.3 % after 1000 cycles at 5 C, superior to LTP/C without incorporation of CNTs (60.1 %). As verified, the excellent electrochemical performance of the LTP/C/CNT composite is attributed to the enhanced electrical conductivity, rapid charge transfer, and Li-ion diffusion because of the incorporation of CNTs.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 21
·4204-4210
·
IF 1.915
Shufang Li,Jianying Qu,Yong Wang,Jianhang Qu,Huijuan Wang
Carbon nanoparticles (CNs) were successfully synthesized at room temperature, which were used to construct a novel electrochemical sensor combined with multi-walled carbon nanotubes and chitosan. The proposed CN-based sensor showed excellent electrocatalytic performance for the oxidation of nitrite and the redox of hydrogen peroxide. Based on this, new methods for the determination of nitrite and hydrogen peroxide were established. Compared with other reports, the methods were sensitive, accurate and rapid with good reproducibility, stability and certain anti-interference ability, which can be used for the measurement of nitrite and hydrogen peroxide.
研究领域:
分析化学
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生物传感器
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纳米医学
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环境监测
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电化学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2013
·Vol. 15
·期 11
·3057-3063
·
IF 6.828
Feng Chen,Wenjing Zhou,Hongfei Yao,Ping Fan,Jintao Yang,Zhengdong Fei,Mingqiang Zhong
We demonstrate the self-assembly of highly dispersed NiO nanoparticles embedded in lignin-derived mesoporous carbon (MPC) frameworks. Self-assembly is induced by evaporation of the solvent from a mixture of metal-containing liquid crystalline mesophases of lignin-derived polymers and transition metal nitrate hydrate, which yielded NiO@MPC nanostructures at 600 °C under a N2 atmosphere. The microstructure and morphology of the NiO@MPC are characterized by XRD, TEM and BET. The results show that the NiO nanoparticles are highly dispersed in a mesoporous carbon matrix. The NiO@MPC composites show metal oxide contents in the range 49–79 wt%, high surface areas (503–802 m2 g−1), uniform pore sizes (≈3.7 nm), various porous distributions and large pore volumes (0.46–0.68 cm3 g−1). Electrochemical studies were carried out by measurement of cyclic voltammetry (CV) and charge–discharge tests. The results demonstrate that the NiO@MPC composites have high specific capacitance (880.2 F g−1 at a current density of 1.0 A g−1) and display good retention. 90.9% of the specific capacitance is retained when the current density changes from 1 A g−1 to 10 A g−1 in the charge–discharge tests and 93.7% of the specific capacitance is retained after 1000 charge–discharge cycles. Thus, the NiO@MPC composites are promising supercapacitor electrode materials.
研究领域:
材料科学
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纳米科技
·
电化学
·
能源存储
·
功能材料
·
碳材料
✓ 已验证
DOI
高影响因子
Energy Technology
·
2021
·Vol. 9
·期 12
·2100743
·
IF 3.631
Xin Hou,Penggang Ren,Zhong Dai,Zhengzheng Guo,Zengping Zhang,Aiyue Sun,Wenwei He,Fang Ren,Yanling Jin
Herein, nitrogen, oxygen codoped porous carbon nanofibers (CNFs) from corn residue-derived lignin are fabricated via the electrospinning method, followed by introduction of graphenes (GNs) via a simple “brush-coating and drying” process. The obtained GN-coated carbon nanofibers (CNFs@GNs) exhibit a 3D network architecture, abundance of heteroatoms, excellent electrical conductivity, high specific surface area (700.92 m 2 g −1 ), thus boosting the electrochemical performances. The CNFs@GNs electrode delivers a higher specific capacitance of 271.1 F g −1 than CNFs (200.3 F g −1 ) at 1 A g −1 . Furthermore, the assembled CNFs@GNs symmetric supercapacitor exhibits an energy density of 20.3 Wh kg −1 at the power density of 199.97 W kg −1 together with a high charge/discharge reversibility of 97.3% and Coulombic efficiency of 99.81% after 10 000 cycles. This “brush-coating and drying” strategy utilized here provides a convenient and efficient route for designing CNFs and GN composites and can be utilized in other active materials.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
Nano Select
·
2021
·Vol. 2
·期 11
·2126-2134
·
IF 0
Junwei Liang,Yuxiang Liu,Rongzheng Liu,Sufan Zheng,Zhichun Si,Duan Weng,Feiyu Kang
Preparing stable highly dispersed Pt based electrocatalyst is promising to reduce material expense of H 2 product via electrocatalytic water splitting. However, it is still a great challenge to obtain stable single atomic Pt catalysts which can be applied in acidic electrolyte. In the present work, we synthesized Pt atomic clusters on carbon quantum dots (CQDs) grafting multiwall carbon nanotube (CNT) (Pt content: 1 wt.%) catalysts and then loading the catalysts on carbon cloth (Pt content: 0.01 mg▪cm –2 ) for activity test. The overpotential of 29 mV versus RHE was obtained over 1%Pt/CQDs/CNT catalysts at the current density of 10 mA▪cm –2 , and the Tafel slope of 22 mV decade –1 was obtained, too. Especially, the catalysts showed significant stability in hydrogen evolution reactions (HER) in acidic solution, of which the overpotential was still smaller than that of 20%Pt/C after 10,000 CV cycles. CQDs provided coordinating sites for dispersing Pt atomic clusters and improved the H + concentration in adjacent area around the Pt clusters. This method provides a general strategy to design the highly efficient electrocatalysts with ultra-low precious metals for H 2 evolution in acidic electrolyte.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能量转换
·
催化
✓ 已验证
DOI
MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 5
·1543-1551
·
IF 4.831
Liu Ren,Zeng Xuebiao,Liu Jingcheng,Luo Jing,Zheng Yuanyi,Liu Xiaoya
The article describes an electrochemical sensor for simultaneous determination of dopamine (DA) and paracetamol (PAT). It is based on the use of an electroactive polymer (referred to as BPVCM) to functionalize multi-walled carbon nanotubes. BPVCM is a branched amphiphilic photo-sensitive and electroactive polymer that was obtained by copolymerization of a vinyl benzylcarbazole, maleic acid anhydride, 4-vinylbenzylthiol and a vinylbenzyloxycoumarin. BPVCM efficiently disperses MWCNT in aqueous solution. The electropolymerization of the carbazole moieties of the BPVCM enhances the current response. It also facilitates electron transfer in the MWCNT-BPVCM hybrid as evidenced by cyclic voltammetry and electrochemical impedance spectroscopy. A glassy carbon electrode modified with the nanocomposite displays outstanding electrocatalytic activity towards DA and PAT. DA can be determined, best at a working voltage of 0.2 V (vs. SCE), in the 5 to 1000 μM concentration range with a 2.3 μM detection limit. PAT can be determined in parallel, at a working voltage of 0.39 V (vs. SCE), in the same concentration range with a 3.5 μM detection limit. This analytical range of this method is wider than that of most alternative methods.
An electrochemical sensor for simultaneous determination of dopamine (DA) and paracetamol (PAT) is described. It is based on the use of an electroactive polymer (referred to as BPVCM) to functionalize multi-walled carbon nanotubes. The electropolymerization of BPVCM enhances the current response and improves the analytical range of the sensor.
研究领域:
分析化学
·
生物医学工程
·
药物分析
·
纳米材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 26
·14311-14319
·
IF 11.9
Lantao Liu,Ziyu Sun,Yaping Lu,Jiapeng Zhang,Yiming Li,Gaixia Zhang,Xiaohong Chen,Sasha Omanovic,Shuhui Sun,Huaihe Song
Due to the environmental friendliness and high safety of aqueous Zn-ion hybrid capacitors (ZIHCs), the exploration of high-performance porous carbon electrodes for ZIHCs has recently attracted significant attention. However, most of the reports focus on the preparation method and modification of porous carbon, and rarely explore the mechanisms of material synthesis/fabrication in the carbonization process. In this study, we developed a simple self-template method for preparing N-doped porous carbon from D-calcium pantothenate (DCP). More importantly, the morphology evolution, heteroatom doping, and defect generation of the DCP during carbonization are clarified. Based on a clear understanding of the carbonization mechanism, assisted by DFT theoretical simulations, we find the optimal carbonization temperature of the DCP-derived porous carbon for ZIHCs. The assembled ZIHCs exhibit excellent rate performance (140 mA h g−1 at 0.2 A g−1 and 86.2 mA h g−1 at 6.4 A g−1), and high energy density and power density (111.1 W h kg−1 and 4835.2 W kg−1, respectively). This work provides a constructive avenue for designing high-performance ZIHC electrode materials.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
碳材料
·
电化学储能
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）