CHINESE JOURNAL OF CHEMISTRY
·
2017
·Vol. 36
·期 3
·187-193
·
IF 1.852
Qing-Ning Zhao,Qing-Wen Song,Ping Liu,Qian-Xia Zhang,Jun-Hua Gao,Kan Zhang
The production of fine chemicals using CO 2 as C 1 building block through inexpensive heterogeneous catalysts with high efficiency under low pressure is challenging. Herein we propose for the first time the utilization of a multifunctional heterogeneous zinc-modified HZSM-5 (ZnHZSM-5) catalyst for upgrading CO 2 by incorporation into cyclic carbonates from CO 2 and epoxides. Owing to the nice surface properties such as abundant Lewis acid, Brønsted acid and Lewis base sites, large surface area, and plenty of micropores, CO 2 could be concentrated and well activated in ZnHZSM-5 verified by CO 2 -TPD, TG-MS, etc . Meanwhile, the epoxides were also activated through metal center and hydrogen bond. Therefore, the reaction can easily assemble at the catalyst interface and show exceptional performance, affording the aimed products with high yield of up to 99% in the presence of commercial tetra- n -propylammonium bromide (90% in kilogram scale with 0.004 mol% ZnHZSM-5 and 0.015 mol% n Pr 4 NBr).
研究领域:
催化化学
·
环境化学
·
绿色化学
·
材料化学
·
有机合成
·
能源化学
·
工业化学
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Zhiyuan Wang,Haohui Zhang,Xinyu Zhang,Xiaomei Wang,Xu Zhang
High-capacity SiO x anodes are fatally limited by poor electrical conductivity and huge volume fluctuations. Nano-engineering can effectively extend battery life, but achieving the transformation of nanostructures from laboratory synthesis to industrial mass production still remains a great challenge. Conventional synthetic routes are plagued by harsh conditions, complex processes, and especially low yields; even if they are adopted by industrial production, the large amounts of solvents in traditional wet chemical methods will pose a potential risk of pollution and energy waste. Herein, a solvent-free and mass-producible strategy is presented to prepare SiO x /C@C nanocomposite via solvent-free sol-gel, ball milling , and carbon coating process . The production exhibits favorable powder properties for conventional LIB fabrication technology, such as narrow particle size distribution , suitable specific surface area, as well as a high yield (40.5%). The prepared SiO x /C@C anode displays a high initial coulombic efficiency (71.4%) and reversible capacity (1279 mAh g −1 at 0.1 A g −1 ), and a great durability (80.08% capacity retention after 1000 cycles at 1.0 A g −1 ). Furthermore, the superior matching performance of SiO x /C@C//LiCoO 2 full-cell is also clearly demonstrated, especially the high energy density (347 Wh kg −1 ). This ingenious and scalable strategy will remarkably promote the commercialization of nanostructures.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
·
电池材料
·
功能材料
·
工业化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Ying Hou,Yu-Lin Liang,Peng-Chao Shi,Yuan-Biao Huang,Rong Cao
It is imperative to develop efficient and robust electrocatalysts for CO 2 reduction reaction (CO 2 RR) that would overcome the sluggish kinetics and exhibit high current density. Porous carbon nanotubes with highly delocalized electrons and tubular structure are promising candidates for CO 2 RR due to it is favorable for the accessible of substrates to active sites. However, there are rare reports of using carbon nanotubes to stabilize single-atom active sites for CO 2 RR. Herein, a self-sacrificial template method is developed to disperse single atomic Ni sites on N-doped carbon nanotubes from metal-organic frameworks (MOFs) for highly efficient CO 2 RR. Compared with the corresponding other N-doped carbon stabilized Ni single-atom catalysts, the obtained hierarchically porous Ni/NCTs exhibited enhanced selectivity and activity for the electrochemical reduction of CO 2 to CO with Faradaic efficiency of 98 %, turnover frequency (TOF) of 9366 h −1 and CO current density of 34.3 mA cm -2 at the applied potential of -1.0 V.
研究领域:
电催化
·
材料科学
·
纳米技术
·
能量转换
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Jiayou Liao,Zhi Wang,Ming Wang,Chengyun Gao,Song Zhao,Jixiao Wang,Shichang Wang
An ion-exchange material – Poly(diallyldimethylammonium carbonate) (PDDACA) containing mobile carbonate has been prepared and it has been blended in a fixed carrier membrane material – polyvinylamine (PVAm) containing abundant amine-group to adjust the carrier microenvironment of the fixed carrier membrane. It makes the mobile carrier cruise around the fixed carrier. On one hand, the CO 2 can be transported continuously in the swing area of fixed carrier through the mobile carriers, the passivity of fixed carrier can be overcome and the utilization efficiency of fixed carrier can be enhanced. On the other hand, a loose and low crystalline system will be obtained by blending two polymers, the number of effective mobile carrier will be increased with mobile carriers unlocking from the crystalline area, and the loose and low crystalline system will provide a good environment for the movement of mobile carriers. These are conducive to enhance the performance of blend membrane in comparision with single polymer membrane. The CO 2 permeance and CO 2 /N 2 selectivity of PVAm-PDDACA membrane, which concurrently contains fixed amine carriers and movable carbonate carriers, can reach 909 GPU and 102 at 0.11 MPa, respectively. The performance of PVAm-PDDACA membrane is enhanced obviously in comparision with PVAm membrane and PDDACA membrane.
研究领域:
膜科学与技术
·
气体分离
·
高分子材料
·
化学工程
·
环境化工
·
能源材料
·
功能材料
✓ 已验证
DOI
高影响因子
Bioresource Technology Reports
·
2023
·
IF 0
Shaoqing Wang,Gaixiu Yang,Juntao Yang,Zhen Wan,Zhihe Li,Weiming Yi
In this paper, the ternary molten salt (Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 ) was introduced into the lignin pyrolysis process for the co-production of monophenols and value-added carbon materials. The effect of lignin/molten salt ratios (i.e., 3:1, 1:1, and 1:3) on lignin pyrolysis behaviour was investigated herein. The pyrolytic products were characterized by gas chromatography–mass spectrometry, ultimate analyses, scanning electron microscopy, nitrogen adsorption analyses, and Raman analyses. Results showed that molten salt media can promote the conversion of bulky phenolic oligomers into mono-phenols by enhancing the cracking and deoxygenation reactions. P-type phenols (49.76 %) were produced when the lignin/molten salt mass ratio was 1:3. The porosity and aromaticity of biochar were regulated in-situ using molten salt. The possible catalytic effect of molten salt on lignin pyrolysis was proposed. This study provides a case reference for lignin waste resource utilization.
研究领域:
生物质转化
·
能源化工
·
材料科学
✓ 已验证
DOI
Results in Surfaces and Interfaces
·
2024
·
IF 0
Xiaohan Jiang,Junjie Zhang,Zitong Zhou,Zihao Zhou,Xinyi Cheng,Shaojun Shi,Jiexia Chen,Yunyun Ling
Blue fluorescent carbon dots with high purity were synthesized through a one-step hydrothermal method using citric acid and ethylenediamine as raw materials and then purification by column chromatography. In-situ controllable synthesis was used to prepare carbon dots-manganese dioxide (CDs-MnO 2 ) nanosheets, with carbon dots as the seed, potassium permanganate as the manganese source and sodium citrate as the reducing agent. The as-prepared nanosheets were characterized by transmission electron microscopy, absorption spectroscopy, and fluorescence spectroscopy. It was found that MnO 2 can be degraded by Glutathione (GSH) through a redox reaction, which restores the fluorescence of CDs. A new method for determining GSH was constructed using CDs-MnO 2 fluorescence sensing. The method is simple and sensitive, with linear ranges of 0.1–5 μM and 10–60 μM, respectively, and a lowest detection limit of 0.034 μM. The method was successfully used for the determination of GSH in human serum, with satisfactory recoveries in the range of 98.9–100.1%.
研究领域:
分析化学
·
生物传感
·
纳米材料
✓ 已验证
DOI
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2019
·
IF 1.163
Jie Wang,Songyan Liu,Ying Chang,Le Fang,Kai Han,Miao Li
Nowadays development of safe and simple siRNA delivery system is still a great challenge. Carbon dots have attracted considerable attention in bioimaging, drug delivery, nanosensors, and other fields during the past few years. In this study, we successfully developed carbon dots (TEPA-CDs) as siRNA nanocarriers based on glucose and tetraethylene pentamine. TEPA-CDs have a mean diameter of less than 10 nm and positive charged decoration. TEPA-CDs could condense siRNA into stable complexes without no obvious premature release. Cellular uptake analysis clearly showed that Cy3-labeled siRNA could be uptake by HeLa cells. GFP expression in HeLa-EGFP cells could be significantly inhibited by TEPA-CDs/siRNA complexes. Our study indicated that TEPA-CDs could be used as a siRNA nanocarrier to tumor cells.
研究领域:
纳米技术
·
分子生物学
·
癌症研究
·
药物递送
·
生物成像
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 31
·期 3
·552-561
·
IF 5.6
Cao Kangzhe,Wang Sitian,He Yanan,Ma Jiahui,Yue Ziwei,Liu Huiqiao
Al is considered as a promising lithium-ion battery (LIBs) anode materials owing to its high theoretical capacity and appropriate lithation/de-lithation potential. Unfortunately, its inevitable volume expansion causes the electrode structure instability, leading to poor cyclic stability. What’s worse, the natural Al 2 O 3 layer on commercial Al pellets is always existed as a robust insulating barrier for electrons, which brings the voltage dip and results in low reversible capacity. Herein, this work synthesized core–shell Al@C–Sn pellets for LIBs by a plus-minus strategy. In this proposal, the natural Al 2 O 3 passivation layer is eliminated when annealing the pre-introduced SnCl 2 , meanwhile, polydopamine-derived carbon is introduced as dual functional shell to liberate the fresh Al core from re-oxidization and alleviate the volume swellings. Benefiting from the addition of C–Sn shell and the elimination of the Al 2 O 3 passivation layer, the as-prepared Al@C–Sn pellet electrode exhibits little voltage dip and delivers a reversible capacity of 1018.7 mAh·g −1 at 0.1 A·g −1 and 295.0 mAh·g −1 at 2.0 A·g −1 (after 1000 cycles), respectively. Moreover, its diffusion-controlled capacity is muchly improved compared to those of its counterparts, confirming the well-designed nanostructure contributes to the rapid Li-ion diffusion and further enhances the lithium storage activity.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米结构设计
·
金属基复合材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Rongrong Chen,Yixiong Wu,Xiang Yang Kong
A microwave-assisted hydrothermal approach combined with carbothermal reduction has been developed to synthesize monodisperse porous LiFePO 4 /C microspheres , which possess the diameter range of 1.0–1.5 μm, high tap density of ∼1.3 g cm −3 , and mesoporous characteristic with Brunauer–Emmett–Teller (BET) surface area of 30.6 m 2 g −1 . The obtained microspheres show meatball-like morphology aggregated by the carbon-coated LiFePO 4 nanoparticles . The electrochemical impedance spectra (EIS) results indicate that carbon coating can effectively enhance both of the electronic and ionic conductivities for LiFePO 4 /C microspheres. The Li-ion diffusion coefficient of the LiFePO 4 /C microspheres calculated from the cyclic voltammetry (CV) curves is ∼6.25 × 10 −9 cm 2 s −1 . The electrochemical performance can achieve about 100 and 90 mAh g −1 at 5C and 10C charge/discharge rates, respectively. As cathode material , the as-prepared LiFePO 4 /C microspheres show excellent rate capability and cycle stability, promising for high power lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
·
固态化学
·
电池技术
✓ 已验证
DOI
高影响因子
Science Advances
·
2022
·Vol. 8
·期 40
·
IF 14.957
Jingzhong Qin,Bo Han,Xixi Liu,Wen Dai,Yanxin Wang,Huihui Luo,Xiaomei Lu,Jiabao Nie,Chensheng Xian,Zehui Zhang
The cleavage and functionalization of recalcitrant carbon─carbon bonds is highly challenging but represents a very powerful tool for value-added transformation of feedstock chemicals. Here, an enzyme-mimic iron single-atom catalyst (SAC) bearing iron (III) nitride (FeN 3 ) motifs was prepared and found to be robust for cleavage and cyanation of carbon–carbon bonds in secondary alcohols and ketones. High nitrile yields are obtained with a wide variety of functional groups. The prepared FeN 3 -SAC exhibits high enzyme-like activity and is capable of generating a dioxygen-to-superoxide radical at room temperature, while the commonly reported FeN 4 -SAC bearing FeN 4 motifs was inactive. Density functional theory (DFT) calculation reveals that the activation energy of dioxygen activation and the activation energy of the rate-determining step of nitrile formation are lower over FeN 3 -SAC than FeN 4 -SAC. In addition, DFT calculation also explains the catalyst’s high selectivity for nitriles.
研究领域:
催化化学
·
有机化学
·
材料科学
·
理论化学
·
可持续化学
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 415
·期 5
·855-865
·
IF 4.478
Lai Haohong,Niu Yuanyuan,Ming Pingtao,Wang Jinhao,Wang Shumei,Xu Yan,Zhai Haiyun
In this paper, a novel electrochemical sensor was constructed for the detection of purine bases. Ultrafine carbide nanocrystals confined within porous nitrogen-doped carbon dodecahedrons (PNCD) were synthesized by adding molybdate to ZIF-8 followed by annealing. With MoC-based PNCDs (MC-PNCDs) as the carrier, gold nanoparticles (AuNPs) were deposited on the electrode surface via potentiostatic deposition as the promoter of electron transfer, forming a AuNPs/MC-PNCDs/activated glassy carbon electrode (AGCE) sensor. MC-PNCDs had a large specific surface area, which combined with the excellent electrocatalytic activity of AuNPs, synergistically improved the electrocatalytic activity. The morphology and structure of the electrode surface modifier were characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray photoelectron spectroscopy, infrared spectroscopy, X-ray diffraction, nitrogen adsorption–desorption analysis, and electrochemical characterization. Under the optimal conditions, the linear detection range of guanine (G) and adenine (A) was 0.5–160.0 μM, and the detection limits (S/N=3) were 72.1 and 69.6 nM, respectively. AuNPs/MC-PNCDs/AGCE was successfully constructed, and was used to simultaneously detect G and A with high sensitivity and selectivity. Moreover, the sensor was successfully used to detect G and A in herring sperm DNA samples. Graphical abstract
研究领域:
分析化学
·
电化学
·
纳米技术
·
材料科学
·
生物传感器
·
生物分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 8
·3561-3572
·
IF 3.5
Guo Jie,Wang Wei,Shi Ruhua,Gu Tainyi,Wei Xian,Zhao Jiaqing,Chao Ming,Zhang Qian,Yang Ruizhi
A microporous layer (MPL) with appropriate aperture and hydrophobicity is key for proton-exchange membrane fuel cells (PEMFCs). The MPLs are typically prepared from mixing carbon black and a hydrophobic agent (i.e., polytetrafluoroethylene) physically followed by annealing at elevated temperatures, resulting in pore blockage and carbon black aggregation. To address this issue, we report a facile method to fabricate uniform porous carbons (UPCs) with single aperture and hierarchical porous carbon (HPC) with multiple apertures using a hard silica template followed by chemical grafting with hydrophobic fluoroalkylsilane (FAS-17). An advanced MPL (GMPL) is fabricated by direct layer-by-layer construction of hydrophobic UPC with different apertures, demonstrating improved water drainage and efficient gas transportation, thereby delivering high output power density of 809.64 mW·cm −2 . The as-fabricated GMPL demonstrates superior performance as compared to the one containing MPL prepared with HPC (HPC-MPL, 781.20 mW·cm −2 ) and the ones employing MPL with a single aperture (714.38–749.89 mW·cm −2 ). The controllable gradient aperture, superhydrophobicity, and open pore/channels contribute to the high performance of PFMFC. This work presents a feasible structural design for MPLs toward high-performance PEMFC. Graphical abstract
研究领域:
材料科学
·
化学工程
·
能源技术
·
纳米技术
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）