NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 2
·857-867
·
IF 3.591
Ziwen Wang,Baichuan Lu,Xiaokun Zhang,Shixiang Lu,Wenguo Xu
Herein, we have prepared a new nanocomposite Bi2S3/Co3O4/rGO/Ni foam substrate electrode through hydrothermal synthesis and an annealing process. SEM clearly shows that the Bi2S3/rGO/Ni foam substrate and Co3O4/rGO/Ni foam substrate prepared under the experimental conditions are cuboid-shaped and flower-shaped, respectively. However, the shape of Bi2S3/Co3O4/rGO/Ni foam is a perfect combination of the above two. We call this cuboid full of petals a flower-rod-like shape. The BET test found that the specific surface area of this unique morphology is as high as 152.7 cm2 g−1, which is beneficial towards charge transfer and improves the overall electrochemical reaction performance of the electrode. In addition, electrochemical performance tests displayed that the Bi2S3/Co3O4/rGO/Ni foam electrode had a high specific capacitance of 2214.3 F g−1 at 1 A g−1. The highest energy density of the Bi2S3/Co3O4/rGO/Ni foam//activated carbon asymmetric supercapacitor is 133.4 W h kg−1 (the corresponding power density is 800.1 W kg−1), and the highest power density is 8568.2 W kg−1 (the corresponding energy density is 70.5 W h kg−1). Additionally, under the condition of 10 A g−1 current density, the capacitance retention rate is still extremely high: 99.4% after 10 000 continuous charge and discharge tests. In practical application, two Bi2S3/Co3O4/rGO/Ni foam//activated carbon asymmetric supercapacitors in series can make a 2.5 V bulb maintain a high brightness for 1 minute.
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高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Zhengfei Yang,Yueyue Zhong,Minghong Fan,Yongqi Yin,Huaiguo Xue,Weiming Fang
Developing electrochemical H 2 O 2 sensors with high sensitivity and selectivity is highly desirable in the food industry. Low-dimensional transition metal oxides are promising in electrochemical sensing due to their attractive characteristics. In this study, leaf-like zeolitic imidazolate framework (ZIF-L) and stick-like zeolitic imidazolate framework (ZIF-S) were used to prepare leaf-shaped L-Co 3 O 4 (L-Co 3 O 4 ) and stick-shaped Co 3 O 4 (S-Co 3 O 4 ). The low-dimensional structure could shorten the electron transmission paths and expose more active sites. A series of characterizations were carried out to investigate the morphology and composition of these two materials. Further, the L-Co 3 O 4 and S-Co 3 O 4 were investigated for electrochemical H 2 O 2 detection. The L-Co 3 O 4 showed good electrocatalytic activity toward H 2 O 2 in the ranges of 0.5–4500 and 4500–10000 μM with a detection limit of 0.47 μM. Moreover, the S-Co 3 O 4 had good H 2 O 2 detection performance in the ranges of 0.5–4500 and 4500–10000 μM with a detection limit of 0.33 μM. The constructed sensors also showed good anti-interference ability, reproducibility, stability, and applicability.
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 24
·3153
·
IF 5.3
Zhenteng Sheng,Hui Zhou,Yuhua Zhang,Jinlin Li,Li Wang
The selective hydrogenation of CO2into high-value chemicals is an effective approach to address environmental issues. Cobalt-based catalysts have significant potential in CO2hydrogenation reaction systems; however, there is a need to control their selectivity better. In this study, copper is introduced onto Co3O4nanosheets using the ion exchange reverse loading method. The unique interaction of these materials significantly alters the selectivity of the cobalt-based catalyst. Results from scanning transmission electron microscopy and scanning electron microscopy indicate that this catalyst enables a more even dispersion of copper species in the Co3O4nanosheets. Temperature-programmed reduction and X-ray photoelectron spectroscopy reveal that the catalyst facilitates the metal–metal interaction between Co and Cu. Temperature-programmed desorption experiments for CO2and H2demonstrate that the close interaction between Co and Cu modifies CO2adsorption, leading to differences in catalytic activity. Moreover, the catalyst effectively suppresses CO2methanation and promotes methanol formation by altering the alkalinity of the catalyst surface and weakening the hydrogen dissociation ability.Keywords:CO2hydrogenation;methanol;cobalt;copper
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PubMed
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 11
·5938-5945
·
IF 7.76
Huimin Jia,Dongfang Yang,Xiangna Han,Junhui Cai,Haiying Liu,Weiwei He
Nanostructured enzyme mimics are of great interest as promising alternatives to artificial enzymes for biomedical and catalytic applications. Studying the chemical interactions between antioxidants and nano-enzymes may result in a better understanding of the antioxidant capability of antioxidants and may help improve the function of artificial enzymes to better mimic natural enzymes. In this study, using Co3O4 nanoparticles (NPs) as peroxidase mimics to catalyze the oxidation of chromophoric substrates by H2O2, we developed a platform that acts as a biosensor for hydrogen peroxide and glucose and that can study the inhibitory effects of natural antioxidants on peroxidase mimics. This method can be applied specifically to glucose detection in real samples. Three natural antioxidants, gallic acid (GA), tannic acid (TA), and ascorbic acid (AA), were compared for their antioxidant capabilities. We found that these three antioxidants efficiently inhibit peroxidase-like activity with concentration dependence. The antioxidants showed different efficiencies, in the following order: tannic acid > gallic acid > ascorbic acid. They also showed distinct modes of inhibition based on different interaction mechanisms. This study serves as a proof-of-concept that nano-enzyme mimics can be used to evaluate antioxidant capabilities and to screen enzyme inhibitors.
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PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Hui-Juan Wang,Bing-Hao Wang,Xiao-Yuan Hu,Sha Bai,Lang Chen,Shuang-Feng Yin
Cu content tunes site occupancy (octahedral or tetrahedral) for active site design. • Cu-Co 3 O 4 -7% induces higher spin Co 3+ , weakens Co–O, boosts O latt reactivity. • Cu-Co 3 O 4 -7% achieves complete CO conversion at 150 °C via O latt -mediated mechanism. • Linking occupancy, spin, bond length to performance for O latt catalyst design. Metal doping represents an effective strategy for modulating the electronic structure of cobalt spinel oxides and tailoring catalytic performance. However, the precise site occupancy of dopants in Co 3 O 4 lattice, octahedral versus tetrahedral, remains a subject of debate, hindering a mechanistic understanding of the promotional role of metal doping. In this study, by adjusting the doping amount of Cu (Cu-Co 3 O 4 -x%, x represents the amount of doped Cu), site-specific incorporation of Cu into either octahedral or tetrahedral sites of Co 3 O 4 was precisely controlled. The resulting Cu-Co 3 O 4 -7% achieves the highest CO oxidation activity under a high gas hourly space velocity. It is revealed that Cu doped in octahedral sites promotes the transition of Co 3+ from low spin to higher spin states. This spin-state transition weakens the Co 3d−O 2p interaction, facilitates lattice oxygen mobility, optimizes CO adsorption, and collectively enhances CO oxidation. This work provides a targeted approach for regulating the Co 3+ spin state and elucidates its critical role in molecular activation processes.
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高影响因子
FUEL
·
2023
·
IF 7.4
Jia Li,Sheng He,Le Li,Zhiyuan Shen,Junyi Li,Congling Shi,Bobo Shi,Xiaoyu Chen,Fubao Zhou
Rapid removing toxic CO for methane-air mixture explosions is essential in reducing casualties, but relevant research is rare. This paper proposed a novel approach for efficient CO removal and explosion suppression for methane-air mixture explosions using Co 3 O 4 powder. The effect of Co 3 O 4 powder on the explosion characteristics and basic parameters to quantify the CO removal performance have been studied, mainly including maximum explosion pressure (P m ), combustion time (t c ), flame propagation velocity, and average CO removal rate (R ave. ). Results indicated that explosion intensity and CO concentration decreased significantly with Co 3 O 4 powder, due to increased heat absorption capacity and the active site of CO catalytic oxidation . However, the average CO removal rate decreased as the Co 3 O 4 powder usage and CH 4 partial pressure increased, which could reduce the dispersion degree of the Co 3 O 4 dust cloud. The CO removal was achieved through the CH 4 catalytic combustion and CO catalytic oxidation, which could reduce the CO generation and oxidize the generated CO to harmless CO 2 , respectively. This work provides a novel routine to lessen the explosion hazards and has promising applications in emergency rescue.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Man Wang,Shichao Chen,Kang Wang,Song Song,Xitao Wang
A Ru-doped CoFe MOF-derived Co 3 O 4 -Fe 2 O 3 heterostructure was fabricated via mild pyrolysis. • The low-temperature strategy preserves the 2D MOF nanosheet scaffold. • Ru incorporation modulates Co/Fe electronic states and suppresses structural aggregation during mild pyrolysis. • Ru 0.024 CoFe MOF-250 requires only 227 mV at 20 mA cm −2 with a Tafel slope of 33.67 mV dec −1 . • Excellent durability is demonstrated by only 8.3 mV potential increase after 100 h at 20 mA cm −2 . Metal-organic frameworks (MOFs) are promising for the oxygen evolution reaction (OER), yet they suffer from framework collapse and active-site aggregation during high-temperature pyrolysis. Herein, a Ru-doped CoFe MOF is grown in situ on nickel foam (NF) and subsequently annealed at 250 °C, forming a Co 3 O 4 -Fe 2 O 3 @Ru 0.024 CoFe MOF heterostructure. The incorporation of Ru modulates the local electronic structure of the Co/Fe centers, while mild annealing at 250 °C generates Co 3 O 4 -Fe 2 O 3 nanophases within the partially preserved MOF nanosheet scaffold. This creates intimate heterointerfaces that facilitate rapid charge transfer. In 1.0 M KOH, the optimized electrode delivers a current density of 20 mA cm -2 at an overpotential of only 227 mV, exhibits a low Tafel slope of 33.67 mV dec −1 , and achieves an electrochemical surface area (ECSA) of 133.5 cm 2 . After 100 h of operation at 20 mA cm −2 , the potential increases by merely 8.3 mV. This work presents an effective strategy that combines Ru doping with mild pyrolysis to construct efficient and stable MOF-based OER electrocatalysts.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Rong Guo,Yongsheng Deng,Yinghao Jia,Caixin Shi,Wenpu Zhang,Ying Zhou,Xinghui Hou
In order to monitor the quality of the surrounding environment and realize the non-invasive screening of diabetes, it is necessary to develop a simple and sensitive acetone sensor. In this paper, GC x porous structures doped with different proportions of Ga element are prepared through calcining Co-MOF synthesized by solvothermal method . The findings indicate that the addition of Ga inhibits the further growth of grain and improves the uniformity of the adhered nanoparticles in GC x . Performance test shows that the GC4 sensor exhibit extremely ultra-high response (197.6, 50 ppm) acetone at 160 °C and relatively low detection limit of 0.1 ppm (2.3). The main reason for the significant improvement of GC x acetone sensitivity is that the introduction of Ga regulates the oxygen vacancy which provide rich reaction activation sites for the further reaction and diffusion of acetone and amplify resistance change by modulating the carrier concentration. A practical method for controlling oxygen vacancy and carrier concentration of sensing materials is shown in this work, which creates a new opportunity for the development of high-performance acetone sensors.
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高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Jin Yang,Xin Shu,Shangying Qin,Li Huang,Shiqi Cheng,Yilin Wang
Co 3 O 4 nanoclusters (NCs) was prepared, and a novel method based on hydrogen peroxide (H 2 O 2 ) mediated fluorescence recovery of calcein-Co 3 O 4 NCs system for cholesterol detection was developed. The detection utilizes fluorescence quenching and recovery of calcein. In the absence of H 2 O 2 , the fluorescence of calcein is quenched by Co 2+ ions on the surface of Co 3 O 4 NCs. However, the fluorescence of calcein is restored in the presence of H 2 O 2 as a result of the oxidation of Co 2+ ions to Co 3+ ions. Further investigation indicates tha Co 3 O 4 t there is a correlation between H 2 O 2 concentration and fluorescence enhancement of calcein. Due to H 2 O 2 being one of the products of cholesterol catalytic oxidation, a novel cholesterol fluorescence measurement method has been established, which can achieve sensitive detection of cholesterol in the range of 1.0–50 μM, with a limit of detection (LOD) as low as 0.48 μM. More importantly, the feasibility of the method was verified in human serum total cholesterol determination with satisfactory results, indicating its potential application in real sample analysis.
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高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Ping Chen,Hui Zhong,Xiao-rong Li,Meisheng Li,Shouyong Zhou
Nanomaterials with intrinsic enzyme-like activities have attracted extensive research interest as promising alternatives to natural biological enzymes due to their advantages of low cost and high stability. Many artificial enzyme mimics have been successfully applied in the fields of sensing, environmental treatment, and oncotherapy. Herein, novel [email protected] 3 O 4 nanocomposites ( [email protected] 3 O 4 NCs) were fabricated by modifying Pal with Co 3 O 4 nanoparticles through a facile hydrothermal method . The obtained [email protected] 3 O 4 nanocomposites as nanozymes displayed enhanced peroxidase-like activity, which can catalyze the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H 2 O 2 ) to obtain colored products. Kinetic assay indicated that the [email protected] 3 O 4 peroxidase mimics showed a higher affinity towards TMB than that of natural horseradish peroxidase (HRP). Moreover, a sensitive and selective sensor for colorimetric determination of H 2 O 2 and ascorbic acid (AA) was successfully constructed by using [email protected] 3 O 4 nanocomposites as peroxidase mimics. Furthermore, the proposed assay for sensing of AA in model samples was evaluated with satisfactory results, demonstrating the potential applications in complex biological systems.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Ziying Hu,Jing Chen,Dongxu Yan,Yan Li,Hongpeng Jia,Can-Zhong Lu
Chlorinated volatile organic compounds (CVOCs) existing widely in the industries are harmful to the environment and human’s health. It is urgent to develop highly efficient catalysts for their combustion. Herein, a series of porous MnO x/ Co 3 O 4 nanocomposites are synthesized by the pyrolysis of Mn@Co-ZIF-67 precursors, in which the Mn ions are introduced by impregnation method. XRD, Raman, ICP-OES, BET, SEM, TEM, XPS, O 2 -TPD, and H 2 -TPR have been performed to investigate the as-prepared catalysts’ physicochemical properties. The optimal catalyst MnO x /Co 3 O 4 -4h exhibits 90% and 100% chlorobenzene (CB) conversion (1000 ppm, Air, WHSV = 60,000 mL/(g h)) at 334 °C and 350 °C, respectively. And the better catalytic performance over MnO x /Co 3 O 4 -4h compared with the pure Co 3 O 4 and other MnO x /Co 3 O 4 nanocomposites mainly ascribes to its porous structures, homogeneous dispersion, optimal Mn/Co molar ratio, more lattice defects, and higher surface O Latt /O Ads ratio. Meanwhile, MnO x /Co 3 O 4 -4h displays high stability and resistance to moisture. Main intermediates have been further investigated by in situ DRIFT, and the degradation mechanism has been proposed according to the analysis of intermediates.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Wenping Wang,Manshu Zhang,Ruiyu Mi,Yangai Liu,Jian Chen
Nanosized cobalt (II, III) oxide (Co 3 O 4 ) is a promising anode material in virtue of its relatively high theoretical capacity. In this study, nanosized Co 3 O 4 was fabricated by facile hydrothermal method followed by annealing. So-obtained samples exhibited integrated characteristics and advantages including porous nanosheets structure, oxygen vacancy , and pseudocapacitance Pseudo-capacitance. The splendid electrochemical properties of Co 3 O 4 electrodes are inseparable from these features providing synergistic effect. During insertion and extraction of lithium ion , porous nanosheets structure not only assisted in buffering volume changes, but also benefitted the transportation of electron/ion. Furthermore, abundant oxygen vacancies improved internal conductivity and promoted migration of lithium ion via regulating surface electronic structure. The pseudocapacitance behavior was instrumental in electrochemical kinetics. Consequently, the resulting nanosized Co 3 O 4 delivered fine discharge specific capacity (1502.5 mAh g −1 ) after 100 cycles at 200 mA g −1 accompanied by the superior capacity retention rate (97.8%). Discharge specific capacity (1093.5 mAh g −1 ) higher than that of graphite, was recorded even at a current density of 2 A g −1 . The results indicate that the as-obtained MNS-CoO 1.0M with excellent properties may act as promising alternative candidates for lithium storage materials.
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高影响因子
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