BULLETIN OF THE KOREAN CHEMICAL SOCIETY
·
2016
·Vol. 37
·期 11
·1827-1830
·
IF 0.793
Yanjun Yin,Xueming Li
In this study, an energetic material was prepared by depositing nano-Al on CuO arrays via electrophoretic deposition (EPD), which offers a feasible route for nano-Al integration. The morphology and structure of the CuO arrays and Al/CuO composites were characterized by scanning electron microscopy and X-ray diffraction. The CuO arrays were homogenously salix leaf-like structure with a width of ~150 to 200 nm. The energy density of Al/CuO composites was approximate to 1454.5 J/g by integrating the differential scanning calorimetry (DSC) plot and the combustion performance was recorded by a high-speed camera. Moreover, the combustion flames were violent and the whole reaction process only lasted 72.2 ms, indicating that the energy of the Al/CuO nanothermite can be released effectively.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Materials
·
2024
·
IF 13
Li Zhang,Peiyue Jin,Ze Wu,Bo Zhou,Junchang Jiang,Aomeng Deng,Qiuyue Li,Tanveer Hussain,Yiqiong Zhang,Hanwen Liu,Shuangyin Wang
The electrochemical coupling of biomass oxidation and nitrogen conversion presents a potential strategy for high value-added chemicals and nitrogen cycling. Herein, in this work, CuO/Co 3 O 4 with heterogeneous interface is successfully constructed as a bifunctional catalyst for the electrooxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and the electroreduction of nitrate to ammonia (NH 3 ). The open-circuit potential spontaneous experiment shows that more 5-hydroxymethylfurfural molecules are adsorbed in the Helmholtz layer of the CuO/Co 3 O 4 composite, which certifies that the CuO/Co 3 O 4 heterostructure is conducive to the kinetic adsorption of 5-hydroxymethylfurfural. In situ electrochemical impedance spectroscopy further shows that CuO/Co 3 O 4 has faster reaction kinetics and lower reaction potential in oxygen evolution reaction and 5-hydroxymethylfurfural electrocatalytic oxidation. Moreover, CuO/Co 3 O 4 also has a good reduction effect on NO 3 − $$ {\mathrm{NO}}_3^{-} $$ . The ex-situ Raman spectroscopy shows that under the reduction potential, the metal oxide is reduced, and the generated Cu 2 O can be used as a new active site for the reaction to promote the electrocatalytic conversion of NO 3 − $$ {\mathrm{NO}}_3^{-} $$ to NH 3 synthesis. This work provides valuable guidance for the synthesis of value-added chemicals by 5-hydroxymethylfurfural electrocatalytic oxidation coupled with NO 3 − $$ {\mathrm{NO}}_3^{-} $$ while efficiently producing NH 3 .
研究领域:
化学工程
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SENSORS
·
2024
·Vol. 24
·期 19
·6420
·
IF 3.4
Cheng Zou,Cheng Peng,Xiaopeng She,Mengqing Wang,Bo Peng,Yong Zhou
Pure tin oxide (SnO2) as a typical conductometric hydrogen sulfide (H2S) gas-sensing material always suffers from limited sensitivity, elevated operation temperature, and poor selectivity. To overcome these hindrances, in this work, hollow CuO-SnO2nanotubes were successfully electrospun for room-temperature (25 °C) trace H2S detection under blue light activation. Among all SnO2-based candidates, a pure SnO2sensor showed no signal, even toward 10 ppm, while the 1% CuO-SnO2sensor achieved a limit of detection (LoD) value of 2.5 ppm, a large response of 4.7, and a short response/recovery time of 21/61 s toward 10 ppm H2S, as well as nice repeatability, long-term stability, and selectivity. This excellent performance could be ascribed to the one-dimensional (1D) hollow nanostructure, abundant p-n heterojunctions, and the photoelectric effect of the CuO-SnO2nanotubes. The proposed design strategies cater to the demanding requirements of high sensitivity and low power consumption in future application scenarios such as Internet of Things and smart optoelectronic systems.
研究领域:
材料科学
·
传感器技术
·
纳米科技
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DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 45
·期 2
·549-561
·
IF 1.674
Liu Wanghui,Yang Jianhong,Cai Jun
An environmentally benign CuO-rectorite was prepared by calcining the co-precipitation product of Cu 2+ with an acid-activated rectorite at pH 6. It could be well dispersed in water and used as a co-catalyst with TEMPO to selectively aerobically oxidize alcohols to aldehydes. The conversion of most primary benzylic alcohols was very high under optimized conditions. Interestingly, the oxidation protocol also allowed highly selective transformation of benzylic alcohols containing a phenolic hydroxyl group into the corresponding aldehydes. Additionally, very little copper was leached from the catalyst during the catalytic reaction. CuO-rectorite could be reused by centrifugation and washed with acetonitrile and water. At the same time, its catalytic activity remained high.
研究领域:
催化
·
有机化学
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 5
·期 12
·9130-9137
·
IF 3.708
Jiahuan Lei,Yu Liu,Xinyu Wang,Pan Hu,Xinsheng Peng
Au nanoparticles/mesoporous CuO nanosheets were successfully synthesized by the assembly of negatively charged AuCl4−1 and positively charged CuO nanosheets using sodium citrate and thermal reduction, respectively. The structure and morphology were characterized in detail. Both the loading amount of Au nanoparticles and the performance were controlled by the reduction process. The resulting Au/CuO NSs exhibited good catalytic activity for CO oxidation and good non-enzymatic sensitivity for glucose.
研究领域:
材料科学
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化学
·
生物传感
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Xiang Lv,Yi Gao,Yueshuai Cui,Chen Wang,Gangchui Zhang,Fang Wang,Peijin Liu,Wen Ao
The ignition and combustion properties of n -Al/CuO/kerosene nanofluid fuels are examined, with a focus on the formulation effects of the n -Al/CuO nano-thermite. The DSC data shows the addition of CuO facilitates the exothermic process of n -Al particles, which then promote the n -Al/CuO/kerosene droplets to evaporate. There are two exothermic peaks on the DSC curve of n -Al/CuO (5 %) at 249.3 ℃ and 463.8 ℃, respectively. The burning of n -Al/CuO/kerosene droplets consists of four stages: ignition, d 2 -law combustion, vapor flame extinguishment, and agglomerate burning. During the agglomerate burning stage, n -Al/CuO (5 %)/kerosene shows the minimum ignition delay at 0.057 s and the highest emission spectral intensity. Droplet combustion conforms well to the d 2 -law, and the maximum combustion rate is found for n -Al/CuO (20 %)/kerosene, at 1.287 mm 2 s −1 . The particle size of combustion residues is uniform, and the overall appearance smoothens as the CuO content increases. A new nanofluid fuel with better ignition and combustion properties than traditional nanofluid fuels is proposed.
研究领域:
能源科学
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材料科学
·
燃烧学
✓ 已验证
产品关联
DOI
高影响因子
Defence Technology
·
2020
·
IF 2.637
Yue-ting Wang,Xiao-ting Zhang,Jian-bing Xu,Yun Shen,Cheng-ai Wang,Fu-wei Li,Ze-hua Zhang,Jian Chen,Ying-hua Ye,Rui-qi Shen
In this study, Al–CuO nanocomposites were fabricated by sol-gel method. As a contrast, the thermite was prepared by physical mixing at the equivalence ratio of 0.5, 1, 2, respectively. The intermediates and samples as prepared were characterized by SEM and XRD. The exothermic properties of the two samples prepared at different equivalence ratios were tested and the reaction products were characterized by XRD. The SEM results show that the sample prepared by the sol-gel method demonstrates a micron-sized agglomerated sphere formed by a mutual wrapping of Al NPs and CuO NPs, and the particles are evenly distributed in the agglomerate. In addition, when the content of Al powder is seriously insufficient, the heat release of the sample prepared by physical mixing is 1.6 times that of by sol-gel method. With the increase of Al powder content, the exothermic properties of Al/CuO NPs prepared by sol-gel method began to increase significantly compared with physical mixing and the difference is 1.5 times when the equivalence ratio increases to 2. It can be concluded that the reason for this result may be attributed to the different mass transfer modes of components due to the different morphologies of samples.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Jianping Yang,Qiaowen Lin,Wei Yin,Tao Jiang,Danhua Zhao,Liaochuan Jiang
In this work, a novel glucose sensor based on Poly-(dimethyl diallyl ammonium chloride) (PDDA) functionalized graphene decorated with cupric oxide (CuO) nanoparticles has been developed. The nanocomposite modified electrode exhibited excellent sensitivity and stability toward oxidation of glucose owing to the synergistic effects of highly electrocatalytic CuO and remarkably electron conductive PDDA-graphene. The composition of PDDA-graphene was confirmed by FT-IR spectrum. The morphology of the nanocomposites was characterized by scanning electron microscopy and X-ray diffraction. The electrochemical performance of the PDDA-graphene/CuO electrode for glucose measurement was investigated by cyclic voltammetry and chronoamperometry. The sensor presented a high sensitivity of 4982.2 μA mM −1 cm −2 over 0.4–4000 μM glucose concentration range at +0.58 V with a detection limit of 0.20 μM. Most importantly, the sensor is highly stable for a long time without current attenuation and is simply fabricated without any binder. The sensor can also be utilized for quantification of glucose concentration in serum samples. The proposed sensor offers an alternative for glucose analysis with high sensitivity, good stability and fast response time.
研究领域:
生物医学工程
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材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Miao He,Yuting Xie,Jie Ni,Yan Jian,Shaoyi Song,Hebin Bao,Xuzhong Zeng,Xueming Li,Qihui Wang
In this study, Al/CuO energetic materials with high exothermic properties were prepared by electrophoretic deposition of nano-Al and CuO microboxes on Ti sheets. The microstructure and phase composition of Al/CuO energetic materials were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The electrophoretic deposition behavior of nano-Al and CuO microboxes were systematically investigated, and the electrophoretic deposition process was controlled by diffusion. The differential scanning calorimetry results showed that the maximum heat released by Al/CuO energetic material is 3049 J/g at an equivalent ratio of 3.0. The combustion properties of Al/CuO energetic materials were tested by optical fiber spectra. When the equivalence ratio was 2.25, the intensity of the spectra of Al/CuO energetic materials were the strongest and the lowest color temperature was 2916 K. This work provides a reference for the preparation of highly exothermic Al/CuO energetic materials by electrophoretic deposition.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuchuan Ye,Jing Xu,Liangjun Gao,Shaohong Zang,Liqiao Chen,Luhui Wang,Liuye Mo
The impregnation method is one of the most popular methods for preparing various types of supported catalysts. However, the preparation of highly active catalysts by the conventional impregnation method is still a great challenge. In this paper, a modified impregnation method (MI) was developed to prepare CuO/CeO 2 catalysts for the catalytic oxidation of ethyl acetate (EA). It was found that the 5 %CuO/CeO 2 catalyst (5-MI-500) prepared by MI method achieves 100% EA conversion at a low temperature of 200 °C. However, the temperature for 100% EA conversion over the 5 %CuO/CeO 2 catalyst prepared by the conventional method is as high as 300 °C. Notably, the 5-MI-500 catalyst exhibits the highest proportion of well-dispersed CuO and Cu-O-Ce structures, which synergistically enhance catalyst activity. The well-dispersed CuO particles enhance the redox ability of the catalyst, while the Cu-O-Ce structure provides high activated oxygen via oxygen vacancy and better thermal stability during catalytic reaction. Accordingly, the possible reaction mechanism over the 5-MI-500 catalyst for EA oxidation was proposed. This study demonstrates that the MI method reported in this paper can provide a feasible methodology to prepare highly active catalysts with unique structures.
研究领域:
催化化学
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环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 20
·e202300450
·
IF 2.1
Qiang Liu,Yong Sun,Xianhai Zeng,Lu Lin,Xing Tang
Graphical We report an example of the oxidation of furfural to furancarboxylic acid using NaClO as the oxidant, under heterogeneous catalyst and room temperature conditions. This reaction system is rapidly reactive and suitable for the large-scale production. It is of great significance to efficiently produce furancarboxylic acid (FA) by furfural oxidation at room temperature. Here in, based on an available CuO-MnCO 3 bimetallic catalyst, an efficient and sustainable heterogeneous catalyst system in sodium hypochlorite solution was designed to be served for the selective oxidation of furfural to FA. Interestingly, Cu 6 -Mn 4 showed 100 % furfural conversion and quantitative selectivity to FA (96.9 %). Especially, we demonstrate the CuO exhibited main catalytic performance in this experiment. In particular, the introduction of MnCO 3 into Cu-Mn catalyst resulted in an increase reactivity of the lattice oxygen in the catalyst. More importantly, Cu 6 -Mn 4 also showed excellent stability in reusability test. This study provides a simple and rapid catalytic strategy and scientific basis for the development of an efficient and mild aerobic oxidation of furfural.
研究领域:
催化化学
·
有机合成
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Jin Li,Qiuling Jiang,Xiujing Xing,Cuilian Sun,Ying Wang,Zhijian Wu,Wei Xiong,Hao Li
Electrochemical conversion of nitrate (NO 3 − ) to ammonia (NH 3 ) is a potential way to produce green NH 3 and remediate the nitrogen cycle. In this paper, an efficient catalyst of spherical CuO made by stacking small particles with oxygen-rich vacancies is reported. The NH 3 yield and Faraday efficiency are 15.53 mg h −1 mg cat −1 and 90.69%, respectively, in a neutral electrolyte at a voltage of -0.80 V (vs. reversible hydrogen electrode). The high activity of the electrodes results from changes in the phase and structure during electrochemical reduction. Structurally, there is a shift from a spherical structure with dense accumulation of small particles to a layered network structure with uniform distribution of small particles stacked on top of each other, thus exposing more active sites. Furthermore, in terms of phase, the electrode transitions from CuO to Cu/Cu(OH) 2 . Density functional theory calculations showed that Cu(OH) 2 formation enhances NO 3 - adsorption. Meanwhile, the Cu(OH) 2 can inhibit the competing hydrogen evolution reaction, while the formation of Cu (111) crystal surfaces facilitates the hydrogenation reaction. The synergistic effect between the two promotes the NO 3 - to NH 3 . Therefore, this study provides a new idea and direction for Cu-based oxides in electrocatalytic NH 3 production.
研究领域:
环境科学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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