JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2020
·
IF 5.647
Jia Liu,Jan Baeyens,Yimin Deng,Xianlu Wang,Huili Zhang
A major action to reduce CO 2 emissions is replacing fossil fuels by renewable energy sources . Matching the energy supply and demand by the mostly intermittent renewable resources (wind, solar, wave) is hence a hot topic, and energy storage has become crucial. Thermo-chemical energy storage (TCES) has a higher energy density than sensible and latent heat storage , and allows energy to be stored in the reaction products for multiple reuse and even off-site application. Design parameters are the equilibrium temperature , the reaction heat and the reaction rate, as obtained from both thermodynamic and kinetic assessments. Equilibrium temperatures of the selected metal oxides , Mn 2 O 3 /Mn 3 O 4 and Co 3 O 4 /CoO are between 1115 K and 1179 K. The present research studies both redox reactions as examples. Commercial Mn 2 O 3 and Co 3 O 4 were previously investigated in detail, and suffer from incomplete reversibility . The present study investigates the use of self-made Mn 2 O 3 and Co 3 O 4 mesoporous particles, of micrometer or nanometer scale, respectively. The average particle size of self-made Mn 2 O 3 particles is < 5 μm, with a BET surface area of 239.7 m 2 /g, and T eq of 1177 K at ambient pressure . Self-made Co 3 O 4 was of nano size, with average size of about 100 nm, a BET surface area of 54.2 m 2 /g, and T eq of 1109 K at ambient pressure. The redox reactions of these ultrafine particles are fast and nearly fully reversible. The effect of adding inert Al 2 O 3 or Fe 2 O 3 was also studied, but proven to offer no kinetic benefit, while reducing the reaction heat due to their inert additive character. The findings were used in the design of a 10 kW TCES pilot plant that is currently being tested in a concentrated solar furnace .
研究领域:
能源存储
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可再生能源
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材料科学
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化学工程
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热力学
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动力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 12
·5865-5872
·
IF 8.867
X. X. Liu,J. B. Zang,L. Chen,L. B. Chen,X. Chen,P. Wu,S. Y. Zhou,Y. H. Wang
A novel electrochemical catalyst comprising CoO@Co nanoparticles with a core–shell structure immobilized on N-doped reduced graphene oxide (rGO) (CoO@Co/N-rGO) has been synthesized using a convenient and controllable technique — combining a rapid microwave-polyol method with a vacuum thermal treatment. Excellent features including the Co/N-doping effect, introduction of CoO@Co particles with a core–shell structure and good contact between the CoO@Co particles and N-doped graphene result in a highly multi-functional catalytic efficiency. The catalyst exhibits remarkable catalytic activity and superior stability towards the hydrogen evolution reaction, offering a low overpotential of 140 mV for 10 mA cm−2 in 0.5 M H2SO4 and 237 mV in 0.1 M KOH. The catalyst also shows excellent oxygen reduction reaction activity in 0.1 M KOH, a similar four-electron pathway, which is comparable to that of a commercial Pt/C catalyst, and superior stability. In addition, a good electrochemical performance towards the oxygen evolution reaction was observed for the catalyst, achieving a current density of 10 mA cm−2 with a small overpotential of 1.67 V in 0.1 M KOH, which is comparable to that of a commercial RuO2 catalyst. The unusual catalytic activities arise from the synergetic chemical coupling effects of metallic Co, cobalt oxides and Co/N-doped graphene. This study provides a new attractive multi-functional catalyst material for unitized regenerative fuel cells and overall water splitting technologies.
研究领域:
材料科学
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电化学
·
能源催化
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 31
·15071-15079
·
IF 3.925
Li Yan,Dandan Chu,Xue-Qiang Chu,Danhua Ge,Xiaojun Chen
Glucose determination with high sensitivity is crucial in human serum and food products. Herein, Co/CoO nanoparticles attached on the outer shell and inner core of porous N-doped carbon polyhedrons (Co/CoO/N-C) were successfully prepared from zeolite imidazole frameworks (ZIF-67) via a pyrolysis–reorganization method, and their sensing performances towards glucose oxidation were demonstrated. For comparison, the ZIF-67, Co3O4 and the sample from ZIF-67@PDA were also tested. Moreover, the experimental results indicated that the Co/CoO/N-C sensor exhibited enhanced electrochemical performance for glucose oxidation, such as high sensitivity (143.9 μA mM−1 cm−2), a wide linear detection range (0.01–16.65 mM) and a low detection limit (0.8 μM, S/N = 3), as well as satisfactory stability and reproducibility. Furthermore, the proposed sensor presented feasibility in real samples. This study may offer a possible way to design and develop MOF-derived electrocatalysts for disease diagnosis and food quality control.
研究领域:
材料科学
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电化学
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传感器
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分析化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jinfan Yang,Zhengqing Li,Xiaoru Niu,Ji Xu,Ning Shang,Wenxi Lei,Hao Wu
Developing a sustainable, efficient, and cost-effective heterogeneous catalyst for advanced oxidation processes is challenging in wastewater remediation. Herein, chitosan intercalated CoFe-layered double hydroxide was first employed as a precursor to fabricate a novel CoFe 2 O 4 -CoO/N-doped carbon composite (CoFe-LDO/NC) via a simple “in-situ coprecipitation-calcination” method. The resulting CoFe-LDO/NC was carefully characterized and employed to degrade tetracycline (TC) with the assistance of peroxymonosulfate (PMS). Under the optimum conditions (30 mg L −1 TC, 0.4 g L −1 catalyst, 0.4 g L −1 PMS, pH = 5), the degradation efficiency and mineralization degree reached 97.6% and 60.7% within 30 min, respectively. The superior activity of CoFe-LDO/NC was ascribed to its well-dispersed metal nanoparticles , large specific surface area (230.7 m 2 g −1 ), hierarchical porous structure, and intensified electron transfer efficiency. The quenching test revealed that both the sulfate radicals and singlet oxygen were the dominant active species in the system. The degradation mechanism and TC evolution route were speculated by X-ray photoelectron spectroscopy and liquid chromatography-mass spectrometry. Escherichia coli growth inhibition test exhibited remarkable detoxification of TC solution after degradation. Moreover, CoFe-LDO/NC could be easily collected by magnetism , and 94.3% of its original activity was retained after five cycles. This work offers a green and scalable approach for the rational design of heterogeneous Co-based catalysts for degradation.
研究领域:
环境科学
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材料科学
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化学工程
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废水处理
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催化
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Haochang Chen,Shunzhe Zhang,Shaoping Wu,Kaifeng Wang,Chi Chen,Yujie Chen,Wenshuang Chu,Zhen Chen,Hua Li,Hezhou Liu
Nano-sized two-dimensional carbonaceous materials have been widely used as the matrix for alloying-type and conversion-type anode materials for Li-ion batteries (LIBs) to improve structural stability and rate performance. However, relevant synthesis usually requires rigorous conditions and chronic reaction processes. Herein, we have designed a simple solvothermal reaction and heat treatment to prepare a novel CoO/Co/C two-dimensional nanosheet (CoO/Co/C 2DNS) by adopting cellulose nanofibers (CNFs) as the precursor. The unique characteristics of CNFs facilitate the uniform distribution of active materials on the surface and the construction of two-dimensional nanostructure via self-assembly. It is worth noting that CoO/Co/C 2DNS exhibits a striking synergistic effect since the porous 2D carbon framework offers additional pseudo-capacitance and enhances the electronic conductivity, while the ultrafine active materials encapsulated inside shorten the Li-ions diffusion pathways and relieve the volume change. Benefit from the unique structure, the composite anode delivered outstanding rate performance (∼500 mAh g −1 at 10 A g −1 ) and superior long-range cycling performance up to 800 cycles even at 2 A g −1 . This work provides a new strategy for the synthesis of nano-sized 2D composite, offering a promising route to construct high performance conversion-type anodes for next-generation LIBs.
研究领域:
材料科学
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能源存储
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纳米技术
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Zhichao Jiao,Yuanqing Chen,Miao Du,Muslum Demir,Fuxue Yan,Weimin Xia,Ying Zhang,Cheng Wang,Mengmeng Gu,Xiaoxuan Zhang,Juntao Zou
The research on the structure of advanced electrode materials is significant in the field of supercapacitors . Herein, for the first time, we propose a novel 3D/3D composite structure by a multi-step process, in which 3D hollow NiCo LDH nanocages are immobilized on 3D sea urchin-like CoO microspheres . Results show that the 3D CoO acts as an efficient and stable channel for ion diffusion, while the hollow NiCo LDH provides abundant redox-active sites. The calculated results based on density function theory (DFT) show that the CoO@NiCo LDH heterostructure has an enhanced density of states (DOS) near the Fermi level and strong adsorption capacity for OH − , indicating its excellent electrical conductivity and electrochemical reaction kinetics. As a result, the CoO@NiCo LDH electrode has an areal specific capacity of 4.71C cm −2 at a current density of 3 mA cm −2 (440.19C g −1 at 0.28 A g −1 ) and can still maintain 88.76 % of the initial capacitance after 5000 cycles. In addition, the assembled hybrid supercapacitor has an energy density of 5.59 mWh cm −3 at 39.54 mW cm −3 .
研究领域:
材料科学
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电化学
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纳米技术
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能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 26
·期 10
·2301-2313
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IF 2.747
Liu Yunfei,Dong Shanghai,Wang Liying,Chen Guohua,Hou Yaping,Cao Zhenzhu,Zhang Yongfeng
The purplish-red rod-like crystal structure of novel bimetallic metal–organic-frameworks (MOF) {CoZn[(4,4′-BDA)(Phen)] 2 } n has been obtained by the reaction of Co 2+ , Zn 2+ (the molar ratio Co: Zn = 1:1), 1,10-phenanthroline (Phen) and 4, 4′-biphenyldicarboxylic acid (4,4′-H 2 BDA), in which Zn ions of the previously reported monometallic MOF {[Zn(4,4′-BDA)(Phen)] 2 ·(HCON(CH 3 ) 2 } n are partly substituted by Co ions. The crystal structure of {CoZn[(4,4′-BDA)(Phen)] 2 } n has been characterized by IR, X-ray photoelectron spectroscopy (XPS), and single-crystal X-ray diffraction analysis. Then, the precursors CoZn-MOF-B@C were obtained by adding a surfactant, activated carbon, and NaOH. Its derivative ZnO/CoO@C was used as anode material for lithium-ion batteries, which showed good lithium storage performance. The initial discharge specific capacity of ZnO/CoO@C is 1437.9 mAh g −1 at a current density of 0.2 A g −1 , and after 100 cycles, the specific capacity drops to 741.8 mAh g −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Jing Jiang,Siyu Deng,Wenhao Kuang,Li Wang,Dong Chen,Yuhong Ma,Wantai Yang
Halloysite nanotubes (Hal) have drawn intensive attentions because of their unique nanotubular structure and large surface area. However, limited adsorption capacity and poor recyclability severely impeded their practical application for water remediation. Herein, to overcome the deficiencies of pristine Hal, we deliberately designed and prepared a series of anhydride and carboxylate functionalized Hal (Hal@PDM-COO − ) via self-stabilized precipitation polymerization. Owing to the merits of both nanotubular structure of Hal and high-density carboxylate ions in the shell layer, the Hal@PDM-COO − possessed a remarkable pH-dependent adsorption performance towards methylene blue ( b -MB). As the solution pH increased from 3 to 11, the sorption capacity increased remarkably from 179.1 to 459.1 mg/g. Furthermore, all sorption processes were better-fitted with pseudo-second-order and Langmuir models, exhibiting a maximum sorption amount of 302.1 mg/g at pH = 7. These results indicate that electrostatic attraction between positive b -MB molecules and negative carboxylate groups plays a dominant role during sorption process, and carboxylate groups distribute homogeneously in the shell layer of Hal@PDM-COO − . More importantly, Hal@PDM-COO − possessed outstanding recyclability, and the removal rate of b -MB kept >95% after five recycle runs. Considering the highly enhanced adsorption capacity, rapid adsorption rate and excellent reusability, the Hal@PDM-COO − showed significant potential for wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 24
·8445-8457
·
IF 5.721
Kun Liu,Yichen Zhao,Jiale Wang,Qingsong Xue,Guofeng Zhao
The fabrication of qualified catalysts is a key issue to implement gas-phase aerobic alcohol oxidation but necessarily requires understanding the structures of catalytic active sites and the supply of active oxygen species. Herein, we present one example of the Ag–CoO/Ti- powder catalyst for gas-phase benzyl alcohol aerobic oxidation. The first interesting observation is that the Ag–Co3O4 ensembles on the fresh catalyst could be transformed into Ag–CoO due to the presence of reductive benzyl alcohol. The preferred catalyst with 3 wt% Ag and 3 wt% CoO exhibits 93% benzyl alcohol conversion and 99% benzaldehyde selectivity at a weight hourly space velocity of 20 h−1 and a temperature of 240 °C. The structures of Ag–CoO ensembles and oxygen species supply were probed and identified by electron microscopy and other spectroscopy techniques in combination with temperature-programmed thermal analyses, pulse experiments, and kinetic studies. In nature, the oxygen species is generated at the Ag–CoO interfacial sites in the form of atomic oxygen with appropriate chemisorption strength on these sites to achieve a high oxidation activity of benzyl alcohol. Moreover, the Co3O4 ↔ CoO cycle is promoted by Ag at low temperature such as 240 °C to endow the Ag–CoO ensembles with excellent catalytic performance.
研究领域:
催化化学
·
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Ni Su,Hefan Zhang,Xueying Wang,Chunlan Xu,Qiaozhi Yan,Daiqiong Yang,Yahong Zhou,Changyu Lu
Herein, carbon quantum dots (CQD) and CoO nanoparticles were loaded as double heat sources in the hollow porous sponge g-C 3 N 4 with photothermal effect, and the CQDs/CoO/PMSCN Z-scheme heterojunction photothermal assisted photocatalytic system was constructed. Meanwhile, a series of characterization and DFT calculations were used to reveal the electron transfer mode inside the heterojunction. The photocatalytic degradation activity was enhanced by coupling the photothermal effect of multiple heat sources with the electron transfer in the heterojunction, and CQDs-2/CoO/PMSCN exhibited a TC degradation rate of 94.7 % after 90 min of light reaction. Notably, after five cycles of experimentation, the degradation rate decreased by only 4 %, demonstrating the material’s good stability and reusability. Additionally, the unique three-dimensional hollow porous structure of PMSCN allows incident light to penetrate and undergoes multiple reflections/refractions. This not only improves the light response range, but also provides certain thermal insulation, reducing heat loss. Finally, the ECOSAR assessment and bean sprout experiments indicated that TC degradation proceeded towards lower toxicity and non-toxicity. These findings highlight the effectiveness of CQDs/CoO/PMSCN for the treatment of antibiotic contamination, maximize energy utilization, and offer new insights for the practical application of CQDs.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Kenken Li,Jiarui Cui,Qi Yang,Songlei Wang,Ruiming Luo,Argenis Rodas-Gonzalez,Peiyuan Wei,Li Liu
In this research, g-C 3 N 4 /Cu@CoO/NC, which contained graphitic phase carbon nitride (g-C 3 N 4 ) with a binary nanostructure and Cu@CoO/NC with a bimetallic MOF precursor, was constructed by a low-temperature pyrolysis process. The g-C 3 N 4 /Cu@CoO/NC was characterised by several techniques, including X-ray diffraction, scanning electron microscope, transmission electron microscope and X-ray photoelectron spectroscopy. Further, it was used to prepare an electrochemical sensor for the detection of ractopamine (RAC) in meat samples. The sensor showed excellent electrochemical oxidation characteristics for RAC detection, with a wide linear range (0.005 μmol/L to 32.73 μmol/L) and low detection limit (1.53 nmol/L). Meanwhile, the reproducibility, stability and interference of the g-C 3 N 4 /Cu@CoO/NC/GCE sensor were found to be excellent. Besides, the g-C 3 N 4 /Cu@CoO/NC/GCE sensor was well-used for the detection of RAC in pork, pig liver and lamb samples with recovery rates ranging from 96.5 % to 102.2 %.
研究领域:
食品科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 32
·15712-15722
·
IF 3.925
Wen Xu,Yuan Ma,Xinjia Wei,Honghui Gong,Xiuge Zhao,Yuxi Qin,Qingpo Peng,Zhenshan Hou
A new strategy has been proposed for synthesizing Co@CoO core–shell nanoparticles with a core–shell structure, which involves a facile solvent-thermal process in deep eutectic solvents (DESs). In contrast to the irregular sheet-like packing material obtained in water, twinned and 3D-ellipsoid-shaped nanoparticles were achieved in choline chloride (ChCl)/glycerol and ChCl/PEG-300, respectively. It was found that the nanoparticles were featured as metal Co(0) cores homogeneously wrapped by CoO shells after reduction under a H2 atmosphere. The Co@CoO core–shell nanoparticles showed good activity and stability for the hydroformylation of olefins, and the conversion of 1-octene can reach 99% at 130 °C under 4 MPa (CO/H2 = 1) pressure, and the selectivity to C9 aldehydes was reached up to 97%. The characterization by XPS, H2-TPR and HRTEM indicated that metal Co(0) species could be an active site for hydroformylation of olefins. Notably, the leaching of cobalt carbonyl species was highly dependent on the surface molar ratio of Co2+/Co0 as revealed by XPS spectra, and the surface CoO layer played an important role in suppressing the loss of active Co species in hydroformylation of olefins. Moreover, the core–shell nano-catalysts are easily separated magnetically from the reaction mixture and showed good recyclability in nine consecutive catalytic runs.
研究领域:
催化化学
·
材料科学
·
表面化学
✓ 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）