ACTA PHYSICO-CHIMICA SINICA
·
2017
·Vol. 33
·期 8
·1672-1680
·
IF 0.767
LIAO Pei-Yi,ZHANG Chen,ZHANG Li-Jun,YANG Yan-Zhang,ZHONG Liang-Shu,GUO Xiao-Ya,WANG Hui,SUN Yu-Han
A series of Cu/Co/Mn/Al catalysts derived from hydrotalcite precursors with different Cu/Co molar ratios (0, 0.1, 0.5, 1.0, and 2.0) were prepared and used for the synthesis of higher alcohols from syngas. N2 physical adsorption desorption, inductively coupled plasma atomic
emission spectrometry (ICP-AES), X-ray diffraction (XRD), scanning electron microscopy (SEM), hydrogen temperature-programmed reduction (H2-TPR), thermogravimetry (TG), and high-resolution transmission electron microscopy (HRTEM) techniques were employed to investigate the physical
and chemical properties of the Cu/Co/Mn/Al catalysts. The results show that the optimum Cu content can increase specific surface area, improve reducibility, and form regular layered structure to provide more uniform distribution of active sites, thereby enhancing catalytic activity and alcohol
selectivity. When the Cu/Co molar ratio was 0.5, the yield of alcohol and the alcohol selectivity reached the maximum values of 0.071 g·g-1·h-1 and 35.9%, respectively.
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
Food Analytical Methods
·
2019
·Vol. 13
·期 3
·617-628
·
IF 2.413
Xiu Yi,Luo Ruiping,Han Baoqing,Liu Lu,Wang Hongsu
In this study, a cobalt-based mesoporous carbon material (Co@C) was prepared by self-assembly method and impregnation method, and carboxyl functionalization was carried out to obtain COOH-Co@C. Then, the penicillinase (Pen X) was immobilized on the carrier material by covalent binding. The methylene blue was electropolymerized onto the glassy carbon electrode, and then the immobilized enzyme material was modified onto the modified electrode to prepare a biosensor. After optimization of experimental conditions, the differential pulse method was used to detect penicillin sodium (Pen G) as an antibiotic model. Notably, measurement was performed without any pH redox probe, and a low limit of detection was obtained. The results showed that when the concentration of Pen G was 0.1–10 ng mL −1 , the corresponding current and concentration of the sensor showed a good linear relationship. The linear equation is y = 0.3881x + 17.20 ( r 2 = 0.9974); when the concentration range is 10–100 ng mL −1 , the linear equation is y = 0.1170x + 19.73 ( r 2 = 0.9959). The limit of detection is 0.64 ng mL −1 . The sensor is not only simple to prepare but also has high sensitivity and accurate detection. Finally, using the spike method, the actual sample detection was successfully realized.
研究领域:
分析化学
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食品科学
·
环境监测
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Shufei Li,Shujun Qiu,Yong Shen Chua,Yongpeng Xia,Yongjin Zou,Fen Xu,Lixian Sun,Hailiang Chu
Rapid release of hydrogen at ambient condition is highly favorable and is necessary for fuel cell power generation on-demand. Hydrolysis of hydrides offers such advantage with sodium borohydride (NaBH 4 ) as a representative exemplar. Despite with exceptionally high hydrogen content, the hydrolysis kinetics of NaBH 4 is sluggish in the absence of catalyst. Co–B alloy has generally been employed as effective catalyst in the hydrolysis of borohydrides. However, Co–B particles are prone to agglomeration during the reaction, reducing the activity and durability of the catalyst. In this work, waxberry-like hierarchical porous carbon microspheres (HPCMs) were successfully prepared and were used as carriers to support Co–B particles to form the Co–B/HPCMs catalyst. The effects of HPCMs with different nitrogen contents in Co–B/HPCMs on the catalytic dehydrogenation rate of NaBH 4 hydrolysis were systematically investigated. The experimental results showed that Co–B/HPCM-2 exhibited excellent catalytic activity in the hydrolysis of NaBH 4 at 298 K, with a low activation energy of 43.3 kJ ·mol −1 and a high hydrogen generation rate of 3083.1 ml H2 ·min −1 ·g −1 . Moreover, after five consecutive cycles, its catalytic activity maintained at 91.7 % of the initial catalytic activity, displaying satisfactory cycling performance. The findings obtained from this study are expected to expand a novel path for the development of efficient Co-based catalysts in heterogeneous catalytic reactions .
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Progress in Natural Science-Materials International
·
2019
·
IF 3.31
Hongming Zhang,Dandan Ke,Lina Cheng,Xuelei Feng,Xuewei Hou,Jin Wang,Yuan Li,Shumin Han
CoPt-Co hybrids were successfully supported on amino modified SiO 2 nanospheres by a chemical reduction method at a temperature of 278 K. The solid carrier i.e. amino modified SiO 2 , provides numerous anchoring sites for the metal nanoparticles (NPs) to improve the dispersion while reducing the size of metal NPs. The supported NPs displayed a narrow particle size distribution on the SiO 2 surface with an average diameter of 12 nm. The XRD results alongside with the binary alloy phase diagram suggest that the resulted NPs are bimetallic, composed of CoPt and amorphous Co. Among the prepared materials, the solid with the specific composition of SiO 2 @Pt 0.1 Co 0.9 was proved to be effective catalyst for ammonia borane (AB) hydrolysis in aqueous solution. The turnover frequency (TOF) value of the supported nanocatalyst was 25.59 mol H 2 ⋅ min − 1 ⋅ mol M − 1 , almost twice as that of unsupported Pt 0.1 Co 0.9 NPs while the activation energy was 37.05 kJ mol −1 . Furthermore, the SiO 2 @Pt 0.1 Co 0.9 composite manifested high catalytic activity even after five cycles of reuse.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
Arabian Journal of Chemistry
·
2022
·
IF 6.212
Zhenzhong Zang,Shichun Zhao,Ming Yang,Chengqun Yu,Hui Ouyang,Lihua Chen,Weifeng Zhu,Zheng-gen Liao,Abid Naeem,Yongmei Guan
Honeysuckle is a commonly used Chinese medicine for treating intestinal inflammation and other diseases. Compounds that are absorbed into the blood produce pharmacodynamic effects. However, it is still unclear which compounds in honeysuckle are absorbed into the blood. Thus, the purpose of this study was to investigate the composition and in vivo absorption of active components in honeysuckle in male Sprague-Dawley rats, and develop a controlled release hydrogel system. UPLC-LTQ-Orbitrap-MS was used to determine the active ingredients of honeysuckle in vitro and in vivo . A total of 80, out of which 42 components were found to be absorbed into the blood, which includes flavonoids, iridoids, organic acids and other compounds. FTIR analysis confirmed crosslinking between hydrogel content and drug loading, and TGA and DSC analysis indicated a high thermal stability. XRD analysis showed a decrease in crystallinity following crosslinking, and SEM revealed an irregular and hard surface. The maximum swelling and drug release were observed at pH 7.4 as compared to pH 1.2. The identified blood components can be used to determine Q-markers, while the prepared hydrogels can serve as an effective and promising carrier for the controlled release of honeysuckle extracts.
研究领域:
中药学
·
药剂学
·
分析化学
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DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 8
·1031
·
IF 4.9
Bingxiao Liu,Yunzhen Zhu,Chen Yang,Liqun Ma,Fuchun Zhang,Mingzheng Hao,Zhongqiang Wang,Lizhen Bai,Jiale An,Dongqi Xiao
In this paper, we report a novel thermally conductive semi-aromatic heat-resistant PA5T-CO-10T/hexagonal boron nitride (PA5T-CO-10T/BN) composite, based on as-synthesized PA5T-CO-10T, which is a copolymer of poly (pentamethylene terephthalamide) (PA5T) and poly (decamethylene terephthalamide) (PA10T). We confirmed the structure of PA5T-CO-10T through a nuclear magnetic resonance carbon spectrometer (13C-NMR). The differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) results indicate that PA5T-CO-10T demonstrates a processing window (greater than 90 °C) which is suitable for melt processing and injection molding. Moreover, the PA5T-CO-10T composites with different BN contents were tested by scanning electron microscopy (SEM), a thermal conductivity meter, a rotational rheometer and X-ray diffraction (XRD). The results indicate that as the content of h-BN increases, the thermal conductivity of the PA5T-CO-10T/BN composites is significantly enhanced. When the mass of h-BN reaches 30 wt%, the thermal conductivity of the composite material is 2.5 times that of the original matrix resin. Simultaneously, there is a notable upward trend observed in the storage modulus, loss modulus, complex viscosity and orientation degree of h-BN. This is attributed to the high thermal conductivity and the high orientation degree of h-BN, which ensure the continuous enhancement of the material’s thermal conductivity. Additionally, the introduction of h-BN enhances the degree of connection between the material’s molecular chains. PA5T-CO-10T/BN possesses excellent heat resistance and thermal conductivity, presenting significant application prospects in the fields of electronics, electrical appliances and automobiles.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Zixiang Song,Mingmei Zhang,Zhuokai Wang,Zhiye Huang,An Wang,Guisheng Zhu,Shouyan Shao
Herein, a new metal organic framework MOF derived CoFe-Fe 5 C 2 nanoparticles embedded nitrogen doped graphitized carbon/ nitrogen doped carbon nanotubes (CoFe-Fe 5 C 2 @NC/CNTs) heterostructures is successfully achieved through calcination in dicyandiamide atmosphere using Co/Fe-MOF as a precursor. The morphologies display that CoFe and Fe 5 C 2 are uniformly dispersed in the framework of nitrogen doped carbon and dicyandiamide forms NCNTS using cobalt as a graphitization catalyst. The as prepared CoFe-Fe 5 C 2 @NC/CNTs hybrids exhibit remarkable specific properties of 60.23 mA cm −2 and small Tafel slope of 106.2 mV dec −1 in potential window from 0.4 V to 0.9 V towards methanol electro- oxidation reaction (MOR) in alkaline solution. At the same time, it realize more excellent stability comparing to that of CoFe-Fe 5 C 2 @NC electrocatalyst, which attributed to the interconnected ion/electron channels of abundant interfaces anchored nitrogen doped carbon nanotubes and the thin layer nitrogen doped graphitized carbon anchor the ultra-fine Fe 5 C 2 and CoFe particles accelerating the charge transport. More importantly, CoFe-Fe 5 C 2 @NC presents 94.6% retention of initial MOR activity during CO poisoning test. This strategy will provide new ideas for the control of the composite structure of transition metal carbides using MOF derivatives, and provide technical support for the development of efficient and CO-resistant non noble metal electrocatalysts.
研究领域:
材料科学
·
电催化
·
能源化学
✓ 已验证
DOI
高影响因子
Green Energy & Environment
·
2021
·
IF 8.207
Chenyun Zhang,Bingwei Xin,Tingting Chen,Hao Ying,Zhonghao Li,Jingcheng Hao
Deep eutectic solvents (DESs) have gained much attention in the fabrication of advanced nanoelectrocatalysts due to their amazing template function. However, their stabilizing function for easily hydrolyzed inorganic nanomaterials is rarely studied. Here, a DES-mediated strategy was reported to synthesize octahedral Ni–Co precursor (NiCo–NH 3 complex), which could be directly transformed into NiCo 2 O 4 nanooctahedrons after thermal decomposition. The NiCo–NH 3 precursor in octahedral shape was achieved with the DES-mediated crystallization in the choline chloride (ChCl)/glycerol. The ChCl/glycerol DES not only tailored the morphology of the as-prepared precursor by template effect but also inhibited its hydrolysis, ensuring the successful fabrication of octahedral NiCo–NH 3 complex precursor with high yield. The NiCo–NH 3 complex precursor was converted to well-defined NiCo 2 O 4 nanooctahedrons, where the calcination temperature and time were explored in detail. It revealed that DES could participate in the conversion process to control the morphology of calcination product. The resultant NiCo 2 O 4 nanooctahedrons demonstrated excellent electroactivity and remarkable durability for oxygen evolution reaction (OER). The present strategy not only offers an efficient OER electrocatalyst but also enriches the approaches of DESs in designing advanced nanocatalysts.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yanling Wang,Zhaozhu Zhang,Mingming Yang,Junya Yuan,Peilong Li,Meng Liu
Co-MOF (cobased metal-organic frame) nanosheets were developed onto the surface of PBO (poly(p-phenylene benzobisoxazole)) fabric, and OMMT (modified montmorillonite) was incorporated into phenolic resin synergistically to improve the wear resistance of PBO/phenolic resin composites. Co-MOF nanosheets with a large specific surface area exhibited strong interlocking and excellent compatibility between the fabric and resin. In addition, OMMT possessed excellent affinity with phenolic resin and a larger lamellar space, and then polymer chains could be conveniently entangled into interlayers, which further confined the movement of molecular chains caused by friction heat. In addition, a weak interlayer force was conducive to facilitating the formation of a uniform and robust transfer-film on the counterpart. It was demonstrated that the Co-MOF@PBO/OMMT composites presented optimal tribological behavior due to the synergistic effect between interfacial modification and OMMT reinforcement.
研究领域:
材料科学
·
表面工程
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DOI
PubMed
高影响因子
ACS Nano
·
2021
·
IF 15.881
Ting Huang,Yingjie Sun,Jianghua Wu,Jia Jin,Chaohui Wei,Zixiong Shi,Menglei Wang,Jingsheng Cai,Xing-Tao An,Peng Wang,Chenliang Su,Ya-yun Li,Jingyu Sun
Although lithium–sulfur (Li–S) batteries have long been touted as next-generation energy storage devices, the rampant dendrite growth at the anode side and sluggish redox kinetics at the cathode side drastically impede their practical application. Herein, a dual-functional fibrous skeleton implanted with single-atom Co–Nx dispersion is devised as an advanced modificator to realize concurrent regulation of both electrodes. The rational integration of single-atomic Co–Nx sites could convert the fibrous carbon skeleton from lithiophobic to lithiophilic, helping assuage the dendritic formation for the Li anode. Meanwhile, the favorable electrocatalytic activity from the Co–Nx species affording a lightweight feature effectively enables expedited bidirectional conversion kinetics of sulfur electrochemistry, thereby inhibiting the polysulfide shuttle. Moreover, the interconnected porous framework endows the entire skeleton with good mechanical robustness and fast electron/ion transportation. Benefiting from the synergistic effects between atomically dispersed Co–Nx sites and three-dimensional conductive networks, the integrated Li–S full batteries can achieve a reversible areal capacity (>7.0 mAh cm–2) at a sulfur loading of 6.9 mg cm–2. This work might be beneficial to the development of practically viable Li–S batteries harnessing single-atom mediators.
研究领域:
材料科学
·
能源存储与转换
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DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Hau Quoc Pham,Tai Thien Huynh,Son Truong Nguyen,Nam Nguyen Dang,Long Giang Bach,Van Thi Thanh Ho
Direct alcohol fuel cells (DAFCs) use liquid and renewable fuels that have been sparked significant interest in a variety of applications; however, the poor catalytic performance of the state-of-the-art Pt nanoparticles (NPs) over carbon support is a major challenge for further DAFC utilization. Herein, the 1D-bimetallic Pt 3 Co nanowires with a diameter of ~4 nm and the lengths of up to several tens nanometers were grown firstly on the non-carbon Ti 0.7 W 0.3 O 2 nanoparticles via a template- and surfactant-free chemical reduction preparation at room temperature. Electrochemical results indicated that the bimetallic Pt 3 Co NWs/Ti 0.7 W 0.3 O 2 catalyst was an effective electrocatalyst toward alcohol (methanol, ethanol) electrochemical oxidation. For instance, the bimetallic Pt 3 Co NWs/Ti 0.7 W 0.3 O 2 catalyst exhibited high mass activity (MOR of ~393.29 mA m g P t - 1 and EOR of ~341.76 mA m g P t - 1 ), low onset potential (~0.01 V vs. NHE for MOR and ~0.20 V vs. NHE for EOR) and superior CO-tolerance (I f /I b value for MOR of ~3.11 and EOR of ~1.54) in comparison with the conventional carbon-supported Pt nanoparticles (NPs) catalyst. Additionally, the mass activity loss of the Ti 0.7 W 0.3 O 2 -supported Pt 3 Co (NWs) catalyst was ~10.68% of the initial mass activity, which ~4.18-time lower than that of the carbon-supported Pt (NPs) catalyst (~44.66% of the initial mass activity) after 5000 cycles test, indicating the superior stability retention of the as-obtained Pt 3 Co NWs/Ti 0.7 W 0.3 O 2 electrocatalyst . These enhancements were attributable to the combination of the advantageous 1D nanostructures with the internal effect of the Pt 3 Co nanowires, the synergistic effect between Pt-M alloy and TiO 2 -based nanomaterials and the superior anti-corrosion possibility of the non-carbon support.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
DOI
高影响因子
Environmental Technology & Innovation
·
2024
·
IF 6.7
Bo Sun,Xiaona Pan,Yu Tian,Wenlong Bi,Menglin Feng,Fenwu Liu,Qingjie Hou
Microbial fuel cells (MFCs) represent a promising clean energy technology with significant application potential. However, their implementation is constrained by the limitations of current membrane materials. Polyvinylidene fluoride-hexafluoropropylene (PVDF-co-HFP) is a material that has garnered interest in the field of electrochemical systems because of its facile moldability into various shapes and sizes of membranes, positioning it as a highly promising alternative to high-cost commercial membranes. Nevertheless, enhancing its electrochemical characterization remains a pivotal challenge to be surmounted for its broad adoption. In this study, an efficient PVDF-co-HFP membrane, augmented with PP13-TFSI ionic liquid and sulfonation (Membrane P-I&S), was successfully synthesized, and its potential as an ion exchange membrane in MFCs was evaluated. The findings indicated that chlorosulfonic acid considerably enhances the hydrophilicity and proton transport properties of PVDF-co-HFP, with the ionic liquid posited as an effective means to augment the sulfonation effect. An MFCs incorporating Membrane P-I&S demonstrated a remarkable current production capacity and power density, exceeding those of the unmodified membrane by more than two and threefold, respectively. In addition, the MFCs based on Membrane P-I&S displayed prolonged cycling stability with a notably porous architecture and enhanced biofouling resistance. This study validates the development of a high-efficiency, cost-effective, and environmentally friendly membrane fabrication approach for application in bioelectrochemical systems. This will help promote the application of MFCs in the field of wastewater treatment and resource recovery.
研究领域:
环境科学
·
生物电化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）