MATERIALS RESEARCH BULLETIN
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2017
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IF 2.446
Jixiang Xu,Jianyang Gao,Yong Liu,Qingyun Li,Lei Wang
A facile method for fabrication of In 2 O 3 /Co 3 O 4 @palygorskite composites from a Co/In-based metal-organic framework (MOF) was reported. First, Co/In-MOFs hybridized with palygorskite (PAL) was prepared via a one-pot solvothermal method. Second, In 2 O 3 /Co 3 O 4 @PAL composites were obtained by pyrolysis of In 2 O 3 /Co 3 O 4 @PAL in air. It was found that the In 2 O 3 /Co 3 O 4 @PAL composite exhibited higher photocatalytic activities than In 2 O 3 /Co 3 O 4 to the degradation of MB and TC under visible-light irradiation. About 99% of MB (within 40 min) and 80% of TC (within 120 min) were degraded using In 2 O 3 /Co 3 O 4 @5.0%PAL as catalyst. It was supposed that the efficient adsorption of MB and TC, and electrostatic interactions between electron–hole and PAL were responsible for such improvement. The photocatalytic degradation mechanisms of MB and TC on the In 2 O 3 /Co 3 O 4 @PAL were investigated. This work shows that hybridization MOFs with PAL could enhance the photocatalytic properties of MOFs-derived metal oxides for water treatment.
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高影响因子
Food Analytical Methods
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2017
·Vol. 10
·期 9
·3149-3157
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IF 2.038
Jing Shasha,Zheng Huijun,Zhao Li,Qu Lingbo,Yu Lanlan
A new sensitive electrochemical sensor based on poly(sodium 4-styrenesulfonate) (PSS) functionalized graphene and Co 3 O 4 nanoparticle clusters (PSS-GN/Co 3 O 4 ) ternary composite was fabricated via two-step synthesis. The PSS-GN/Co 3 O 4 nanocomposite significantly increased the oxidative activity of amaranth due to the individual merit and mutual effect of PSS-GN and Co 3 O 4 nanoparticle clusters which improved the performance of the electrochemical sensor with high sensitivity. Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) measurements were used for the detection of amaranth. Under the optimal conditions, the oxidation peak currents of amaranth increased proportionally to the concentration within the range of 0.01–1.0 and 1.0–6.0 μmol L −1 , and the limit of detection was 4.0 nmol L −1 . The proposed modified electrode was highly sensitive and was successfully applied to determine amaranth in the soft drinks with satisfactory recoveries. The as-prepared PSS-GN/Co 3 O 4 /GCE electrochemical sensor offers a feasible way for designing simpler, low cost, and environment-friendly sensors based on Co 3 O 4 nanoparticle clusters.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Xuefeng Zhang,Qin Yang,Zixiao Li,Wenjing Tang,Asmaa Farouk,Mohamed S. Hamdy,Yingchun Yang,Xuping Sun
The electrochemical chlorine evolution reaction (CER) is an essential and valuable technology for converting Cl − to Cl 2 in industrial-scale applications. However, under the background of freshwater scarcity, seawater electrolysis for Cl 2 generation becoming highly demanded. Meanwhile, pollutant degradation in the ocean is still challenging, especially in coastal and offshore seawaters. Herein, we provide a facile approach for constructing a highly efficient system for simultaneous Cl 2 evolution and organic contaminant abatement utilizing Co 3 O 4 nanosheet arrays decorated carbon cloth (Co 3 O 4 /CC) anode in the marine environment. The fabricated Co 3 O 4 /CC electrode achieved a considerably low potential of 1.55 V to reach a current density ( j ) of 10 mA cm −2 and long-term stability of 12 h at 100 mA cm −2 in seawater (pH = 2). Meanwhile, the practical environmental remediation results attested that the Co 3 O 4 nanosheet arrays possess an outstanding Carbamazepine (CBZ) degradation efficiency of 100 % within 6 min accompanied with a k value of 0.358 min −1 in real seawater, demonstrating the integrity and reusability. The overall findings offer new insight into designing highly active CER catalysts with efficient pollutant degradation in the marine environment.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Zhijia Liao,Ninghao Chu,Zhenyu Yuan,Yanbai Shen,Fanli Meng
This study successfully synthesized “silver ear-like” Co(OH)F using 15 nm SiO 2 spheres as seeds. Gas sensitivity of Co(OH)F with and without SiO 2 spheres to toluene was compared at different annealing temperatures. The results demonstrate that the Co(OH)F-Si-350 sensor exhibits optimal gas sensitivity to toluene, with a response of 35 (R g /R a ) to 100 ppm of toluene at 220℃, with response and recovery times of 50 s and 80 s, respectively. Notably, the sensor detected toluene concentrations as low as 50 ppb, indicating good sensitivity to low concentrations. These findings suggest that the structural transformation resulting from the introduction of SiO 2 nanospheres, forming ultra-thin nanosheet clusters (∼12 nm), provides abundant active sites, effectively promoting substance diffusion and adsorption/desorption processes. Additionally, the incorporation of fluorine enhances the Lewis acidity of the material, facilitating the formation of stable adsorption states for gas molecules on the surface. These results reveal the significant impact of the structural transformation caused by the introduction of SiO 2 nanospheres on gas sensitivity, providing a strong theoretical foundation for further optimizing gas sensor design.
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Journal of Energy Storage
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2024
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IF 8.9
Bairui Tao,Xiaoyan Feng,Fengjuan Miao
In order to solve the problem of glucose detection in medical development and meet the urgent demand for new energy storage devices, this paper proposes a new material suitable for glucose sensing and capacitive properties. The sensor was fabricated by depositing Co 3 O 4 nanoparticles onto nickel foam with integrated r-GO via the hydrothermal method, followed by the synthesis of CuO nanoparticles using electroplating. The detection range of the sensor is 0.3–11.3 mM. The sensor's sensitivity is 1000.3 μA mM −1 cm −2 , indicating its responsiveness to changes in analyte concentration. In electrochemical test systems, Signal-to-Noise Ratio (SNR) usually represents the relative intensity of the effective current signal and the background noise, reflecting the accuracy and reliability of the measurement. When the SNR is three, the minimum detection limit is 0.431 μM, highlighting its ability to reliably detect analytes at low concentrations amidst background noise. According to electrochemical workstation tests, the sensor demonstrates robust stability. Furthermore, the electrode material proves suitable for asymmetric supercapacitor devices, when the current density is 2 Ag −1 , the specific capacitance is 660.5 Fg −1 . At the same time, we also explore the cyclic stability of the device, which can retain 92.3 % of its initial specific capacitance after 5000 cycles, showing its remarkable long-term stability. In addition, the prepared nanocomposites can also light the red LED light. The results show that the synthesized CuO/Co 3 O 4 /r-GO/NF electrode can be used for electrochemical glucose sensing and supercapacitors, and plays an important role as a multi-functional material in the fields of medical, food, electronics, transportation and energy, providing key technical support for a variety of applications.
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CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Limin Hu,Guangshan Zhang,Meng Liu,Qiao Wang,Peng Wang
In this study, a novel Co 3 O 4 -Bi 2 O 3 catalyst was synthesized using a microwave-assistant method, and the corresponding characteristics were studied through XRD, SEM, and N 2 adsorption. As a peroxymonosulfate (PMS) activator, the catalytic activity of the synthesized catalyst was evaluated on Bisphenol A (BPA) removal, and the result showed that Co 3 O 4 -Bi 2 O 3 catalyst promoted BPA degradation, where 100% BPA was degraded within 15 min under the condition of [catalyst] = 0.1 g·L −1 and [PMS]/[BPA] molar = 5. The Co 3 O 4 -Bi 2 O 3 /PMS system presented a good catalytic activity when the solution pH varied from 3.0 to 11.0. Under the different concentrations of various inorganic anions in the Co 3 O 4 -Bi 2 O 3 /PMS system, Cl − showed an inhibited effect at low concentration and a promoted effect at high concentration. CO 3 2− showed a slight inhibited effect, while H 2 PO 4 − showed a considerable inhibited effect. Additionally, both NO 3 − and SO 4 2− showed a negligible effect on BPA removal. For the real water bodies, both the drinking water and tap water showed a slight decrease in degradation efficiency of BPA but a distinctly negative effect on BPA mineralization, which might be contributed to the competition between BPA and indigenous organic matters in the two water matrices for their oxidation by radical species. The quenching experiment was enforced and it was found that both SO 4 − and OH on the surface-bound of catalyst were the main active radicals in this system. Overall, the Co 3 O 4 -Bi 2 O 3 catalyst as a PMS activator is a promising catalyst in PMS activation for sulfate radical-based wastewater treatment.
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高影响因子
TALANTA
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2018
·
IF 4.244
Yun Zhu,Zezhou Yang,Maoqiang Chi,Meixuan Li,Ce Wang,Xiaofeng Lu
Fabrication of core-shell nanostructured catalyst is a promising way for tuning its catalytic performance due to the highly active interface and rich redox properties. In this work, hierarchical Co 3 O 4 @NiO core-shell nanotubes are fabricated by the deposition of NiO shells via a chemical bath treatment using electrospun Co-C composite nanofibers as templates, followed by a calcination process in air. The as-prepared Co 3 O 4 @NiO core-shell nanotubes exhibit a uniform and novel hollow structure with Co 3 O 4 nanoparticles attached to the inner wall of NiO nanotubes and excellent catalytic activity toward the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H 2 O 2 . Due to the synergistic effect, the peroxidase-like activity of the Co 3 O 4 @NiO core-shell nanotubes is much higher than that of individual Co 3 O 4 and NiO components. Owing to the superior peroxidase-like activity, a simple and rapid colorimetric approach for the detection of dopamine with a detection limit of 1.21 µM and excellent selectivity has been developed. It is anticipated that the prepared Co 3 O 4 @NiO core-shell nanotubes are promising materials applied for biomedical analysis and environmental monitoring.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Chunpei Yu,Wenchao Zhang,Yu Gao,Debin Ni,Jiahai Ye,Chenguang Zhu,Kefeng Ma
The energy performance of nanothermites in aqueous conditions is commonly restricted by the rapid heat dissipation and corrosion of nano-Al. Here we report studies on the fabrication and submerged ignition for the super-hydrophobic nanothermite film based upon the Co 3 O 4 /Al core/shell nanowires (NWs). The Co 3 O 4 NWs arrays, which are synthesized using a facile hydrothermal-annealing method, serve as templates for the deposition of Al shells by magnetron sputtering. The super-hydrophobic surface is subsequently realized by the fluoroalkylsilane coating. The tests of the laser-induced underwater ignition reveal that the super-hydrophobic modification effectively could lead to the ignition of the nanothermite film. Furthermore, the anti-aging behaviors of the obtained super-hydrophobic nanothermite film in aqueous conditions are investigated in detail to compare the heat-release and ignition characteristics at different submersion times. Impressively, the resultant super-hydrophobic composite could still hold about 50% of the original energy even after an underwater storage of 2 days.
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APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Xinzhe Shi,Rongrong Deng,Qibo Zhang
Co 3 O 4 -based electrode materials exhibit great potential for utilization as efficient catalysts for the oxygen evolution reaction (OER), especially in acidic media. However, enhancing their catalytic stability remains a crucial challenge. Herein, we present a facile electrochemical deposition approach coupled with calcination treatment to achieve in-situ growth of active Co 3 O 4 films from a deep eutectic solvent with water as the modifier. The incorporation of water optimizes the structure of fabricated Co 3 O 4 by increasing oxygen vacancies and elevating the Co 2+ /Co 3+ ratio, enabling it to sustain the OER in 0.5 M H 2 SO 4 . Impressively, the catalyst grown on Pt/Ti substrate exhibits stable operation over 125 h at 10 mA cm −2 . Attenuated total reflection-fourier transform infrared (ATR-FTIR) spectroscopy reveals that OER on the defect-rich Co 3 O 4 catalyst occurs through both lattice oxygen mediated mechanism (LOM) and adsorption evolution mechanism (AEM).
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FUEL
·
2024
·
IF 6.7
Guangyi Chen,Qi Yin,Xiang Li,Xiaoqiang Han,Ceng Qin,Yunlong Ji,Yuli Chen,Wenzhuo Zhang
Spinel Co 3 O 4 which possesses two types of Co sites such as Co 2+ at tetrahedral site and Co 3+ at octahedral site, has been regarded as a promising non-noble metal oxygen evolution reaction (OER) catalyst to replace the state-of-the-art IrO 2 catalyst. Constructing cationic vacancy is an effective method to regulate the electronic structure and optimize the catalytic performance of the active site. Therefore, the spinel Co 3 O 4 with Co vacancy at tetrahedral site (d-Zn 0.3 -Co 3 O 4 ) or at octahedral site (d-Al 0.3 -Co 3 O 4 ) were fabricated in this paper by alkali etching the corresponding Zn doped Co 3 O 4 or Al doped Co 3 O 4 . Density of state (DFT) calculations show that the Co vacancy can enhance the d band center close to Fermi level. While Co vacancy at tetrahedral site can greatly enhance the catalytic activity of neighbour Co 2+ site, which is even better than the traditional octahedral Co 3+ site. Therefore, d-Zn 0.3 -Co 3 O 4 shows the superior OER activity gives a small 293 mV (1 M KOH) and 364 mV (1 M PBS) overpotential at 10 mA cm −2 and admirable long-term stability.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Tiantian Wang,Yue Shi,Jiawei Fei,Jiawei Zhu,Lumin Song,Caixia Li,Tianrong Zhan,Jianping Lai,Lei Wang
Exploring earth-abundant electrocatalysts to replace platinum/iridium for acidic overall water splitting at high current density is an important challenge towards lowering the cost of green hydrogen production . Herein, we developed a new class of three-dimensional interconnected nanofibers (NFs) composed of ultra-small Ni-doped Co 3 O 4 nanoparticles (Ni-Co 3 O 4 NFs). Benefiting from the unique ultra-small Ni-doped Co 3 O 4 composition and three-dimensional interconnected porous structure, 13.4 % Ni-Co 3 O 4 NFs (Ni doping is 13.4 wt%) exhibits remarkable electrocatalytic performance in acidic media. Specially, in strongly acidic environments, high activity and high stability overall water splitting can be achieved at high current density. As evidenced by the fact that a voltage of 500 mA cm −2 can be achieved at only 1.86 V and operational stability can be maintained at 500 mA cm −2 for 100 h.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2025
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IF 17.7
Yuanjie Xu,Run Hou,Kunxiang Chi,Bo Liu,Zemin An,Lizhi Wu,Li Tan,Xupeng Zong,Yihu Dai,Zailai Xie,Yu Tang
Palladium-based catalysts have long been considered the benchmark for methane combustion; however, the authentic phase of catalytic active sites remains a subject of ongoing debate. Additionally, challenges like water-poisoning and long-term stability need to be addressed to advance catalyst performance. Herein, we investigate Pd on Co 3 O 4 nanorods as a highly effective catalyst for catalytic oxidation of methane, demonstrating long-term stability and water tolerance during a 100-h continuous operation at 350 °C. Comprehensive characterizations reveal the presence of an active Pd-oxygen vacancy (O v )-cobalt interface in Pd/Co 3 O 4 , which effectively adsorbs molecular O 2 . The absorbed oxygen species on this interface are activated and directly participate in methane combustion. Moreover, near-ambient pressure X-ray photoelectron spectroscopy demonstrates that Pd nanoparticles undergo a rapid phase transition and predominantly remain in the metallic state during the reaction. This behavior is attributed to the electronic metal-support interaction between Pd and Co 3 O 4 . Furthermore, in situ Fourier transformed infrared spectrum reveals that under reaction conditions, HCO 3 * species are formed initially and subsequently transformed into formate species, indicating that the formate pathway is the dominant mechanism for CH 4 oxidation.
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