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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiao Bai,Hui Zhang,Junpin Lin,Guang Zhang
Hypothesis Silicon-carbon composites have been faced with the contact issues between silicon and carbon in the form of material aggregation and inferior dispersion, leading to electrode cracking or kinetic degradation during cycling. In addition to dispersion improvement from interfacial linkage between self-assembled Si nanoparticles (SiNPs) and carbon fibers (CNFs), the positive influences of high-content carboxymethyl cellulose(CMC) (25 wt%) and amorphous carbon are also expected, respectively after the second-step self-assembly and subsequently sintering. Experiments A novel composite (i.e. Si-CNF@C) with the decoration of entire SiNPs in the framework of both CNFs and amorphous carbon was prepared via two-step electrostatic self-assembly followed by sintering. Such a composite with heterogeneous nanostructure was used as a lithium-ion battery anode without additional binders or conductive agents. Findings SiNPs can be well protected with CNFs and amorphous carbon against the dispersion and contact problems under both effects of electrostatic attraction and chemical bonding. With the double-protected heterostructure , such a novel Si-CNF@C electrode exhibits highly reversible capacities of 1200 mAh g −1 , 982 mAh g −1 , and 849 mAh g −1 after 100, 500, and 1000 cycles at 0.5 A g −1 , respectively. The long-term cycling stability with a capacity loss of 0.036% per cycle over 1000 cycles is comparable.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
复合材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jie Song,Ye Xu,Yujue Wang,Shenghu Li,Siyi Yin,Wanglai Cen,Dan Xiao,Qian Zhao,Xicui Zhang,Yan Meng
Hard carbons are significant in sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs). However, the structural defects of hard carbons lead to poor rate performance and cycling stability, which need further improvement. The waste cooking oil was used as the precursor to synthesize 3D carbon nanosheets (NWCOC) with amino nitrogen functional groups, multi-layered pores, and expanded interlayer spacing. The excellent electrochemical properties of NWCOC were investigated and it was demonstrated that NWCOC can significantly improve the adsorption of Na + /K + on hard carbons, substantially enhancing the embedding/de-embedding of Na + /K + , reducing the diffusion distance of ions and electrons, and improving their adaptability to volume changes. In situ XRD and Raman characterization reveal that the Na storage mechanism of NWCOC is mainly based on adsorption/intercalation-filling. Combined with density functional theory, it is shown that the porous structures doped with nitrogen have a greater propensity for ion adsorption, resulting in increased ion capture and storage. As expected, NWCOC650 exhibits high capacities of 489.4 and 388.3 mAh/g in SIBs and PIBs. NWCOC650 displays superior performance in the Na 3 V 2 (PO 4 ) 3 /NWCOC650 full cell, achieving a capacity of 107.84 mAh/g. This work presents a new perspective on the synthesis and mechanisms of high-performance anodes for SIBs and PIBs.
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
RSC Advances
·
2023
·Vol. 13
·期 23
·15998
·
IF 3.9
Jiehong He,Pin Lv,Jian Zhu,Hexing Li
Correction for ‘Selective CO 2 reduction to HCOOH on a Pt/In 2 O 3 /g-C 3 N 4 multifunctional visible-photocatalyst’ by Jiehong He et al. , RSC Adv. , 2020, 10 , 22460–22467, https://doi.org/10.1039/D0RA03959D .
研究领域:
催化化学
·
环境科学
·
材料科学
·
能源化学
·
光化学
✓ 已验证
DOI
PubMed
高影响因子
Toxics
·
2022
·Vol. 10
·期 9
·489
·
IF 4.472
Chunlin He,Yun Liu,Chunhui Zheng,Yanming Jiang,Yan Liao,Jiaxin Huang,Toyohisa Fujita,Yuezhou Wei,Shaojian Ma
Utilising waste amine-oxime (WAO) resin through microwave semi-carbonization, a carbon adsorbent (CA) was obtained to remove Pb(II). After microwave treatment, the pore size of the skeleton structure, three-dimensional porous network, and lamellar pore structure of WAO was improved. The distribution coefficient (Kd) of Pb(II) onto CA is 620 mL/g, and the maximum adsorption capacity of Pb(II) is 82.67 mg/g after 20 min of WAO microwave treatment. The adsorption kinetics and adsorption isotherms conform to the quasi-second-order kinetic equation and Langmuir adsorption isotherm model, respectively. The surface of MT-WAO is negatively charged and the adsorption mechanism is mainly electrostatic interaction. Pb(II) elution in hydrochloric acid solution is more than 98%, and its recovery is high at 318 K and for 1 h.
研究领域:
环境化学
·
吸附科学
·
资源回收利用
·
水污染治理
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2024
·Vol. 28
·期 7
·2445-2454
·
IF 2.6
Xu Lihuan,Wang Jianan,Su Chang
Silicon-carbon materials have broad development prospects as negative electrode materials for lithium-ion batteries. In this paper, polyvinyl butyral (PVB)-based carbon-coated silicon (Si/C) composite materials were prepared using PVB-coated Si particles and then high-temperature carbonization methods. Furthermore, the PVB-based carbon-coated silicon/artificial graphite composite materials (Si/C-Gr) were prepared by using artificial graphite as conductive skeleton. And the electrochemical and battery performances of Si/C and Si/C-Gr composite materials as negative electrode materials of lithium-ion batteries were investigated in detail. The results showed that PVB-based carbon was uniformly coated on the surface of silicon particles, and the electrochemical performance and battery performance of the Si/C composite material was improved with the increasing proportion of PVB in the reaction feed. With the introduction of artificial graphite, the constructed ternary composite of Si/C-Gr as anode exhibited a further improved electrochemical performances, such as cycling stability, rate performance, and coulombic efficiency. Specially, the Si/C-Gr (1:30:0.7) composite anode has a discharge specific capacity of 1239.9 mAh/g in the first cycle and 922.9 mAh/g in the 100th cycles at a current density of 0.1 A/g. And the corresponding coulombic efficiency was 84.5% in the first cycle and maintained at around 98% after 100 cycles. The average discharge specific capacity was 1045.5, 796.08, 688.75, 507.09, and 479.11 mAh/g at the current rate of 0.1, 0.2, 0.4, 0.8, and 1 A/g, respectively. This is attributed to the addition of artificial graphite forming an effective conductive skeleton structure, which enhanced the structural stability of the composite material and improved the electronic conductivity of the electrode material. Also, PVB as functional coating polymer improved the dispersion of Si particles on the surface of graphite. All above reasons enabled the electrode materials to have good electrochemical performances.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 41
·21661-21667
·
IF 11.301
Dongchuang Wu,Xinyue Wang,Linghao Shi,Kaiyue Jiang,Mengjia Wang,Chenbao Lu,Zhenying Chen,Pan Liu,Jichao Zhang,Diana Tranca,Yang Hou,Yu Chen,Xiaodong Zhuang
Metal clusters with exposed atomic interfaces and unique electronic structures have received considerable attention in heterogeneous catalysis. However, their potential application in the electrocatalytic CO2 reduction reaction (CO2RR) remains very challenging because metal clusters tend to drive the competitive hydrogen evolution reaction. In this study, we prepared Fe-cluster sites with positive valence anchored on ordered mesoporous carbon materials for use as an efficient and durable electrocatalyst in carbon dioxide electroreduction. The as-prepared catalyst exhibits high selectivity, with a CO faradaic efficiency of higher than 98% at a low overpotential of 0.37 V, and retains 98.5% of its initial selectivity after 50 h of electrolysis in 0.5 M KHCO3. In addition, the as-prepared catalyst exhibits enhanced selectivity of more than 95% from −0.5 to −0.8 V in 0.1 M KHCO3, has 98.6% CO faradaic efficiency at a low overpotential of 0.49 V, and retains 99% of its initial selectivity after 50 h of electrolysis, thus outperforming state-of-the-art Fe–N-based single-atom catalysts. Density functional theory calculations revealed that the atomic interfaces on the Fe clusters reduce the reaction barrier for the *COOH intermediate, thus contributing to the rapid transformation of CO2 molecules and resulting in excellent catalytic performance.
研究领域:
电催化
·
多相催化
·
材料科学
·
环境化学
·
能量转换
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 40
·16028-16034
·
IF 5.101
Jun Shi,Zhengzheng Zhang,Gefei Li,Shaokui Cao
Alginate/CaCO3 hybrid beads with pH- and thermal-responsive drug release properties were prepared under compressed CO2 using aliphatic poly(urethane-amine)s (PU) as the thermal-responsive component. Polyacrylic acid (PAA) was used as a crystal growth additive to control the structure of the hybrid beads. The hybrid beads were characterized by using scanning electron microscopy, X-ray powder diffraction and thermogravimetric analysis. The interaction between PAA and aliphatic PU contributed to the formation of alginate beads with a compact CaCO3 shell. Indomethacin release behaviour was found to be pH- and thermal-responsive. The release profiles were sustained with CaCO3 microparticles, indicating that the compact CaCO3 shell could hinder the permeability of the encapsulated drug and reduce the drug release effectively. The results suggest that the hybrid alginate beads can be used as “smart” polysaccharide materials for sustained dual-responsive drug delivery.
研究领域:
生物材料
·
药物递送系统
·
高分子科学
·
纳米医学
·
药剂学
·
生物化学
·
组织工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 50
·108538-108552
·
IF 5.8
Wang Yongqiang,Bai Yibo,Han Che,Li Zaimei,Lun Xiaowen,Zhang Conglu
Graphite-like carbon nitride (g-C 3 N 4 ) is favored for its excellent physicochemical properties. However, the high complexation rate of photogenerated carriers greatly limits its practical applications. Based on this, a novel CQDs-doped carbon nitride nanosheets composite (CNS/CQDs) was prepared and applied to the visible light–induced activation of peroxymonosulfate (PMS) for meloxicam (Mel) and tetracycline (TC) degradation. The photocatalytic degradation of Mel and TC were remarkably promoted in the CNS/CQDs+PMS+vis system. Mel photodegradation of 99.90% was achieved over 30 min with 20 mg CNS/CQDs and 20 mg PMS at pH11. And TC photodegradation of 95.97% was achieved over 45 min with 20 mg CNS/CQDs and 20 mg PMS at nature pH6.5. The TOC mineralization rates of Mel and TC were 75.49% and 52.00%, respectively. The transient photocurrent response and electrochemical impedance measurements (EIS) results indicated that the doping of CQDs could improve the charge transfer efficiency of pure g-C 3 N 4 , and CNS/CQDs had a low charge transfer resistance. Capture experiments and EPR tests explored the effective actives in the CNS/CQDs+PMS+vis system. Possible degradation pathways of Mel were also analyzed. This study provides valid residual drugs degradation under the dual conditions of visible light catalytic oxidation and persulfate oxidation, which will be a novel perspective for advanced oxidation technology to effectively remove organic pollutants from water.
研究领域:
环境科学
·
光催化化学
·
水处理技术
·
纳米材料
·
高级氧化工艺
·
药物代谢
·
环境污染物降解
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 15
·21459-21465
·
IF 4.527
Xianwei Su,Xiaojia Shang,Yusi Che,Shaolong Li,Jianxun Song,Jilin He
Homogenous ZrC x O y powders have been successfully synthesized by in-situ electro-reduction of solid ZrO 2 –C composite precursors in molten CaCl 2 . The effect of applied cell voltage and molar ratio of ZrO 2 to C on preparation of ZrC x O y were investigated. The reduction pathway of the composite electrode was studied based on the analysis of intermediate products using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that ZrO 2 is firstly converted to CaZrO 3 . The resulting CaZrO 3 is then reduced to ZrC x O y . The ZrC x O y formation is dramatically influenced by electrolysis voltage and molar ratio of ZrO 2 to C: a higher cell voltage and lower molar ratio of the ZrO 2 to C are more preferable for the formation of ZrC x O y powder. Homogenous ZrC x O y powders with particle size of ~100 nm are synthesized by ZrO 2 /C starting elemental powders in CaCl 2 molten salt at 1123 K for more than 3 h, when the cell voltage is 3.0 V and the molar ratio of the ZrO 2 to carbon starting materials is 1:1.0.
研究领域:
材料科学
·
无机非金属材料
·
电化学合成
·
粉末冶金
·
固态化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）