RENEWABLE ENERGY
·
2023
·
IF 8.7
Xinyu Yang,Shanshan Shao,Xiaohua Li,Dong Tang
The catalytic transfer hydrogenation (CTH) of bio-oil over CuO/PC (porous carbon) with the solid residue produced during biomass pyrolysis as the carrier was investigated with methanol as the hydrogen donor. The effect of carbonization temperature, activation temperature, KOH solution and metal loading on the physicochemical characteristics of CuO/PC catalystand catalytic transfer hydrogenation of bio-oil were investigated. The main alcohols formed in the CTH of bio-oil were 1, 4-butanediol, 1, 3-cyclopentadiol, 1, 3-cyclohexanediol, 2-cyclohexenol and alcohols. It was revealed that more alcohols were produced over CuO/PC using less Cu(NO 3 ) 2 than Cu 2 Al considering their favorable porous system. The well-developed pore structure is formed in PC at a higher calcination temperature and the concentration of activator, which was favorable for the CTH of bio-oil. Under the optimized preparation conditions, the mesopores accounting for 50% in the total pores, achieving the maximized yield of alcohols of 81%, and the well recycling performance was observed with the overall yield of alcohols decreases within 3% after five cycles because of the greater mesopores ratio. The biochar-based PC catalyst in this work enhances the effective usage of biomass to produce alcohols, fully conforming to the theme of energy conservation and low-carbon times.
研究领域:
能源与环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 10
·4164
·
IF 4.6
Jassim Mohamed Hamed Al-Kurdhani,Huajun Wang
A series of supported CuO-based nanoparticle catalysts were prepared by the impregnation method and used for the synthesis of glycerol carbonate from glycerol and CO2in the presence of 2-cyanopyridine as a dehydrant and DMF as a solvent. The effects of supports (activated alumina, silicon dioxide, graphene oxide, graphene, and activated carbon), CuO loading amount, calcination temperature, and reaction parameters on the catalytic activity of the catalyst were investigated in detail. XRD, FTIR, SEM, BET, and CO2-TPD were used for the characterization of the prepared catalysts. It is found that CuO/Al2O3shows a higher catalytic activity, which depends on the CuO loading amount and calcination temperature. The surface area and number of basic sites of the catalyst exhibit a crucial effect on the catalytic activity of CuO/Al2O3. Furthermore, there is a synergistic effect between the catalyst and 2-cyanopyridine where the former has a higher activation ability for glycerol and the latter acts not only as a dehydrant, but also as a promoter for CO2activation. Recycling experiments reveal that this catalyst can be reused for at least five cycles without any inactivation. Based on the experiment results and FTIR characterization, a possible reaction mechanism for the carbonylation of glycerol and CO2is proposed.Keywords:glycerol;glycerol carbonate;carbon dioxide;2-cyanopyridine;CuO/Al2O3
研究领域:
催化化学
·
材料科学
·
环境化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS TECHNOLOGY
·
2017
·
IF 1.155
Mouping Fan,Haiying Yu,Yu Chen
CuO nanosheets prepared by a hydrothermal treatment were tested as anode material for sodium-ion batteries (SIBs) with aid of different binders, namely carboxymethyl cellulose (CMC) and poly (vinylidene) fluoride (PVDF). Compared with electrode containing PVDF, CuO nanosheets electrode with CMC binder showed significantly more satisfactory electrochemical performance. Specifically, CuO nanosheets electrodes with CMC binder delivered a high reversible capacity of 627.2 mAh g−1 at 50 mA g−1, and 73.4% of initial capacity value at a high current density of 2000 mA g−1 after 100 cycles. According to the morphological characterisation after cycling, compared with PVDF, CMC binder better preserved the structural integrity of the anode and accommodated the volume variation of CuO nanosheets during charge/discharge cycling, thus leading to a more satisfactory electrochemical performance. Furthermore, to explore the practical application of CuO nanosheets anode, a SIB full cell consisting of CuO nanosheets anode and Na3V2(PO4)3 cathode was assembled and tested.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Hao Zhang,Siyuan Gao,Zeyao Feng,Zhen Sun,Xianwen Yan,Zhenhua Li,Xueli Yang,Guofeng Pan,Ye Yuan,Lanlan Guo
Room temperature H 2 S gas sensor with low detection limit is necessary for practical application. In this work, ZnFe 2 O 4 was synthesized through a simple solvothermal method, and then CuO was decorated onto the surface of ZnFe 2 O 4 via a modified metal organic framework synthesis method . After a series of characterization methods, it was found that CuO/ZnFe 2 O 4 had porous nanosphere morphology. Gas sensing measurements indicating that the synthesized CuO/ZnFe 2 O 4 porous spheres exhibited excellent H 2 S sensing performance under room temperature, including high sensitivity under low concentration (less than 10 ppm), excellent selectivity, low limit of detection (0.1 ppm), good repeatability, and fast response/recovery time. The sensing mechanism was discussed in detail, which is mainly contributed to the sensitization effect of CuO. This work provides a new strategy for constructing room temperature H 2 S gas sensor based on ZnFe 2 O 4 .
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Congcong Wei,Dazhong Zhong,Dandan Li,Genyan Hao,Guang Liu,Jinping Li,Qiang Zhao
Hydrogen production from electrolyzed water is a mature technology and has great development prospects in terms of energy conversion and utilization. However, the kinetically sluggish oxygen-evolution reaction becomes the limiting step in the electrolysis of water . Copper-based materials have been reported as a good choice to catalyze the oxygen evolution reaction , but their performance is poor. We describe a Cu 2-x Se@CuO/copper foam core–shell structure from the in situ electrochemical oxidation of Cu 2 Se/copper foam to promote the oxygen-evolution reaction performance. The presence of a semi-metallic Cu 2-x Se core and nanostructured CuO shell at a current density of 10 mA cm −2 requires a low overpotential of 253 mV. The Tafel slope was only 73 mV dec −1 . The preparation of Cu 2-x Se@CuO on three-dimensional copper foam facilitates the reaction.
研究领域:
材料科学
·
能源转换与存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Liangdi Zhu,Yuxing Zhou,Lingyun Fei,Xunlong Cheng,Xixi Zhu,Lanqing Deng,Xin Ma
CuO/Fe 3 O 4 /GO, as a Z-scheme heterojunction catalyst, was successfully synthesized and used as a photocatalyst for removing tetracycline from aqueous solution. The CuO/Fe 3 O 4 /GO heterogeneous catalyst combines the narrow bandgap semiconductor CuO, oxygen vacancies of Fe 3 O 4 , and oxygen-containing reaction sites of GO. Without the addition of activators (persulfate or H 2 O 2 ), the photocatalytic performance on decomposing tetracycline is very excellent. Compared with GO, Fe 3 O 4 , and CuO, CuO/Fe 3 O 4 /GO exhibits superior photocatalytic performance. Under visible light radiation , CuO/Fe 3 O 4 /GO generates h + and ⋅O 2 − , which are the mainly responsible active groups for TC degradation . The effects of various pH, catalysts, and reuse on the degradation performance are evaluated, and the optimal conditions for CuO/Fe 3 O 4 /GO removal of tetracycline are obtained at pH 7, catalyst dosage 20 mg⋅L −1 , TC at a concentration of 30 mg/L, nearly 97.3% of tetracycline is decomposed. This study has great potential in the treatment of wastewater containing various antibiotics.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xingsheng He,Da-Peng Yang,Xiaoyan Zhang,Minghuan Liu,Zewen Kang,Chenfei Lin,Nengqin Jia,Rafael Luque
In the present work, we synthesized CuO-ZnO (CZ) nanocomposites using a bio-templated method from biowaste-eggshell membranes (ESM). Results showed that CZ-ESM nanocomposites of morphology and structure preserved the original structural characteristics of ESM with interlaced network coated by small inorganic nanoparticles. In addition, the samples exhibit excellent adsorption, catalysis and antibacterial activities. Experimental results showed the adsorption kinetics and isotherm were well described by pseudo-second order kinetics and Langmuir isotherm model for Congo red dye, the maximum adsorption capacity was determined to be 775 mg•g −1 . The catalysis reduction efficiency of CZ-ESM nanocomposites for 4-nitrophenol (4-NP) reached 98% after 12 min at room temperature. CZ-ESM could be recycled several times without any significant activity loss. Furthermore, the results of antibacterial experiments indicated that CZ-ESM nanocomposites exhibited a strong inhibition activity against E. coli and S. aureus . The maximum diameter of the inhibition zone was 27.5 mm for S. aureus and 20.3 mm for E. coli .
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhixiu Yang,Xiaoxuan Guo,Yong Chen,Lijing Gao,Ruiping Wei,Xiaomei Pan,Guomin Xiao
Despite significant advancements in the investigation of catalyst morphology in electrochemical CO 2 reduction (ECR), achieving precise control over multi-carbon (C 2+ ) products selectivity remains challenging. Thus, a sequence of catalysts with incorporation of CuO onto three-dimensional (3D) spherical CeO 2 were synthesized using a hydrothermal and calcination two-step method. The molar ratios of Cu(NO 3 ) 2 ·H 2 O to Ce(NO 3 ) 3 ·6H 2 O can manipulate morphology and oxygen vacancies (O v ) of Cu x Ce y catalysts, further influencing their product distribution in ECR . Materials characterization and electrochemical testing demonstrate that dual effects of spherical morphology and O v in the Cu x Ce y catalysts can enhance the activity and C 2 H 4 selectivity in ECR . To elaborate further on the topic, the pure CeO 2 exhibits excellent Faradaic efficiency (FE) of CH 4 with the value of 54.3 %. Cu 7 Ce 3 , among all Cu x Ce y catalysts, reaches a maximum value of 37.22 % at −1.2 V vs. RHE, possibly attributed to its highest O v concentration. More significantly, the possible reaction pathway was monitor by ATR-FTIR technique for Cu x Ce y during ECR is: CO 2 → *COOH →*CO → *CHO → *OCCOH → C 2 H 4 . The concept of dual tuning strategy by morphology and O v opens up a wide range of possibilities for the development of effective Cu-based catalysts for ECR.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Haineng Bai,Cheng Feng,Hui Guo,Xiaoli Li,Weifeng Liu,Yamin Feng,Kuili Liu,Dunjun Chen,Youdou Zheng,Fuqiang Guo
Monitoring and reducing NO 2 pollution at room temperature is indispensable for human survival. Thus, we propose a light-activated route (UV light, 100 mW/cm 2 ) to realize a high-performance NO 2 detection based on CuO/rGO gas sensor. The CuO/rGO sensor under UV light illumination exhibits a high response of 22.18–100 ppm NO 2 at 23 ℃, which is approximately 1.36 times of the CuO/rGO sensor and 2.31 times of the CuO sensor under dark, respectively. Meanwhile, under UV light illumination, the CuO/rGO sensor has a fast response/recovery speed of 10.9/30.9 s to 20 ppm NO 2 at 23 ℃, which is obviously better than that under dark. Moreover, the light-activated CuO/rGO sensor has excellent repeatability, selectivity, ultra-low detection limit (50 ppb) and long-term stability. The significantly appealing gas-sensing performance of CuO/rGO sensor is mainly ascribed to the mesoporous structure, high specific surface area and plentiful oxygen vacancy of CuO/rGO nanocomposites . More attractively, the photo-generated carriers and formed heterojunction also greatly improve the carrier migration in the context of the NO 2 /CuO/rGO interaction, enhancing the gas-sensing performance of gas sensor. Our work will provide insight in utilizing light illumination to realize ultrasensitive and room-temperature detection of ppb-level NO 2 gas.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FirePhysChem
·
2025
·
IF 3.6
Jianhua Hou,Dongmei Ren,Jiarong Duan,Xiaobao Liu,Yongqi Da,Jianbing Xu,Yinghua Ye
Aiming at the problem that the ignition ability of semiconductor bridge (SCB) is limited by the quality of bridge area, an energetic semiconductor bridge (ESCB) was prepared by 3D direct writing printing method. Using Al/CuO as the main component of the energetic ink and nitrocellulost (NC) as the binder, an energetic ignition bridge was successfully prepared by combining the energetic ink on the SCB surface. The electric detonation and ignition experiments of SCB and ESCB were carried out by means of capacitive discharge, and the gap ignition experiments proved that the ignition ability of SCB was successfully enhanced by energetic ink. In the electrical explosion experiment, under the excitation of 30 V capacitor discharge, the melting and vaporization time of ESCB bridge zone is longer than that of SCB, because the energetic film absorbs the heat generated by the bridge zone. Due to the bonding effect of NC, Al and CuO are more closely combined and the reaction is more complete, and the heat release of energetic ink is 1232 J/g. At 30 V/100 µF, the ESCB can ignite the B/KNO 3 charge at an 10 mm gap when the ink charge is 3 mg. The results demonstrate the strong ignition ability of ESCB, which has a good application prospect in the use of ignition and fire transmission sequences.
研究领域:
材料科学
·
电子工程
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2020
·
IF 1.566
Xiaoqi Tan,Xiaolei Yue,Meng Yuan,Shuxia Liu,Yaodong Zhang,Baobi Li,Jujie Luo,Qingping Guo
CuO/CNT composites were synthesized via simple and rapid microwave approach. The nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Further, the electrochemical performances of CuO/CNT composites were evaluated. The prepared samples displayed high specific capacitances of 164.5 F g − 1 at 1 A g − 1 , during the cycle process, the capacitance value aggrandized to 274.7 F g − 1 , and the capacitance remained at 166% of the primary value after 10 000 turns. Moreover, the CuO/CNT//AC asymmetric supercapacitor (ASC) exhibited an energy density of 17.08 Wh kg − 1 at 775 W kg − 1 and excellent electrochemical stability in 6M KOH aqueous electrolyte, showing its enormous potential in energy-storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Meng Fei,Renli Fu,Simeon Agathopoulos,Jun Fang,Caixia Wang,Haitao Zhu
A novel method for preparing aluminum/aluminum nitride ceramics (Al/AlN) substrates is proposed in this paper. The method included two processes: (1) the surface of AlN was coated with a CuO thick film and sintered; (2) Al foil was put on the pretreated (in process 1) AlN surface and bonded to AlN through pre-heating at 400 °C and final heating at 660 °C in N 2 -H 2 reduction atmosphere. The experimental results obtained by optical and scanning electron microscope (SEM) observations as well as by X-ray diffraction analysis at the cross-sections of the joints and the fracture surfaces , suggest that the reaction mechanism starts with the reaction of CuO with AlN to form CuAlO 2 , when the AlN coated with CuO is heat-treated at high temperature. A Cu layer is produced by the reduction of CuO and Cu diffuses in the Al foil, forming strong Al/AlN joints. Elongated crystals of Al 2 Cu are developed in the reaction zone at the interface between Al and AlN. The results of mechanical tests showed that the peeling-off strength of the Al foil from the surface of the AlN substrate reached a value of 15.4 MPa for the Al/AlN couples produced after 30 min of heat treatment at 660 °C.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）