CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Yongbing Lou,Dan He,Zhifei Wang,Yuhang Hu,Ying Shen,Jing Ming,Jinxi Chen
A novel nanocomposite, ultrasmall Co 3 O 4 nanoparticles decorated on ultrathin surface of MoS 2 nanosheets, namely MoS 2 /Co 3 O 4 , was synthesized as an anode material for lithium ion battery. The discharge capacity of MoS 2 /Co 3 O 4 nanocomposite reached 1100.0 mAh g −1 after 50 cycles at 200 mA g −1 , much higher than the pure Co 3 O 4 nanoparticles. Moreover, it could maintain reversible capacity of 946.6 mAh g −1 even after 50 cycles at a high current density of 500 mA g −1 . While increasing the current densities step by step from 100 to 200, 500, and 800 mA g −1 , the capacities of MoS 2 /Co 3 O 4 nanocomposite are 1474.9, 1209.9, 952.6 and 801.9 mAh g −1 , respectively. The excellent electrochemical performance resulted from the designed nanocomposite composed of uniformly distributed ultrasmall Co 3 O 4 nanoparticles and ultrathin MoS 2 nanosheets, which maximally utilized electrochemical active MoS 2 nanosheets and Co 3 O 4 nanoparticles for lithium ion batteries. Moreover, this composite structure may provide more extra spaces for the storage of lithium ions and help to accommodate the volume change through a synergistic interaction between two active materials.
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高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Jiayi Wu,Lujie Wang,Hongxin Wang,Xinhui Gu,Yucheng Zhou,Fengna Xi
Sensitive detection of alpha-fetoprotein (AFP) is crucial for early liver cancer screening. In this work, an immunosensor is constructed by combining the immunorecognition interface and enhanced electrochemiluminescence (ECL) of luminol under neutral condition utilizing cobalt oxide (Co 3 O 4 ) nanozymes confined in nanochannels, which realizes highly sensitive detection of AFP. Indium tin oxide (ITO) conductive glass is used as the supporting electrode, and silica nanochannel film (SNF) is simply grown on the ITO surface using the Stöber method. Co 3 O 4 nanozymes are in situ grown within the SNF nanochannels by a one-step electrodeposition method. The rigid 2D nanochannel array of SNF effectively confines the Co 3 O 4 nanozyme, significantly enhancing its stability. Epoxy modification on the external surface of SNF enables covalent attachment of AFP antibodies, leading to recognition interface. Confined Co 3 O 4 exhibits peroxidase-like activity, catalyzing the generation of reactive oxygen species (ROS) from hydrogen peroxide (H 2 O 2 ), enhancing luminol oxidation and boosting the ECL signal under neutral conditions. Upon AFP binding, antibodies capture AFP to form immunocomplexes, causing reduced diffusion of luminol and H 2 O 2 to the electrode surface, decreasing the ECL signal. The constructed immunosensor exhibits a linear range for AFP detection from 100 fg/mL to 10 ng/mL, with a limit of detection (LOD) of 18.5 fg/mL. AFP detection in serum samples from liver cancer patients or healthy individuals is successfully achieved.
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Surfaces and Interfaces
·
2024
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IF 5.7
Mshari A. Alotaibi,Abdulrahman I. Alharthi,Adeel Ahmed,Awais Khalid
The disastrous pollution resulting from antibiotics may traverse extensive distances through water, presenting a serious threat to aquatic ecosystems and human well-being. The catalyst-assisted heterogeneous activation of peroxymonosulfate (PMS) has emerged as an intriguing technology for purifying such wastewater. Herein, we have designed cobalt tetroxide anchored over graphitic carbon nitride (Co 3 O 4 -g-C 3 N 4 ) catalysts through an impregnation and high-temperature calcination technique for the effective degradation of moxifloxacin (MOX) antibiotics from wastewater. The experiments revealed that the MOX degraded completely in 21 min in the Co 3 O 4 -g-C 3 N 4 /PMS system with a degradation kinetics constant of 0.1858 min −1 , faster than the Co 3 O 4 /PMS under optimal conditions ([Co 3 O 4 -g-C 3 N 4 ] = 0.5 g/L, [PMS] = 0.5 mM, [MOX] = 20 mg/L, pH = 6.3). Specifically, the higher degradation of MOX in the Co 3 O 4 -g-C 3 N 4 /PMS system can be credited to the larger surface area (97.22 m 2 /g) of the Co 3 O 4 -g-C 3 N 4 catalyst in comparison to the Co 3 O 4 (69.08 m 2 /g), which enhanced the accessibility of catalytic active sites and improved the PMS activating process. Further, the impression of varied operating factors and intervening anions on MOX abatement was also scrutinized. The production of reactive oxygen species was verified using quenching experiments and further validated by electron paramagnetic resonance analysis. The mechanistic degradation pathways of MOX were anticipated through the acquisition of degradation by-products. The mechanistic insight revealed that the PMS activation was caused by the transitions of Co 3+ /Co 2+ pairs in the reaction system. Overall, this study sheds new insights for subsequent research into the catalytic mechanism of heterogeneous catalysts utilizing PMS activation to degrade organic pollutants.
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Materials Today Communications
·
2025
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IF 4.5
Xiangxiang Fan,Yilin Xu,Yutian Chen,Chun Huang
Gas sensing performances of MOF-derived metal-oxide-semiconductor were significantly affected by structural collapse and self-agglomeration. To solve the problem, ZIF-67 derived Co 3 O 4 based on polystyrene sphere templates were prepared by room temperature precipitation and high temperature calcination. The prepared materials were characterized and analyzed by a variety of characterization methods. The results showed that the structure and dispersion of ZIF-67 derived Co 3 O 4 were affected by template concentration. The optimized ZIF-67 derived Co 3 O 4 showed a hollow porous polyhedral structure with the improved integrity, dispersion and stability of structure. The BET results showed that the optimized hollow porous polyhedra had the larger specific surface area and richer pores. Because of the improved material properties, the gas sensing performances was also greatly enhanced. The response of the optimized ZIF-67 derived Co 3 O 4 to 10 ppm triethylamine was 6.72, while the response of ZIF-67 derived Co 3 O 4 without template was only 3.81. Compared with the sample without template, the response time of the optimized ZIF-67 derived Co 3 O 4 were shorter 27 s and the recovery time were shorter 154 s. Besides, the gas responses of the optimized sample with template showed a good stability and repeatability. The relative standard deviation of responses during 41 days was only 2.992 %. This work showed that the template-assisted growth is a promising way to enhance the structure and gas sensing properties of ZIF-67 derived Co 3 O 4 .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Daming Yang,Yingyue Zhang,Jiaqi Sun,Xinyu Zhang,Ze Gao,Qilong Sun,Tong Wu,Wei Lu,Guiru Sun,Ming Feng
The photo-assisted strategy is viewed as a promising method to improve the ORR and OER performance of Li–O 2 batteries. Nevertheless, designing a photocatalyst that ensures wide light absorption and minimizes the recombination of photoinduced electrons and holes is still a notable challenge. In this study, 2D porous Co 3 O 4 nanosheets are synthesized as photocatalysts for photo-assisted Li–O 2 batteries. Their unique structure improves surface area, facilitates O 2 transport, and stores discharge products. Equally, the Co 3 O 4 nanosheets exhibit strong light responsiveness and photocatalytic activity. Upon optical field, photoinduced electrons and holes are successfully separated on Co 3 O 4 nanosheets, which promotes the formation and decomposition of Li 2 O 2 , respectively. Li–O 2 cells using Co 3 O 4 nanosheets display a low overpotential of 0.15 V and good cycling stability under optical field. These findings highlight the potential of Co 3 O 4 nanosheets as photocatalysts for photo-assisted Li–O 2 batteries, providing a foundation for future energy storage advancements.
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高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Xiaoqing Wang,Cong Du,Yue Yu,Weiyi Li,Tuo Li,Siyuan Wang,Shanjun Mao,Yongjiang Wang,Junzi Zhao,Chunhua Xiong
Given the crucial impact of lattice matching on the charge-transfer efficiency and overall catalytic activity in heterojunctions, we pre-designed an α-Bi 2 O 3 /Co 3 O 4 photocatalytic system with high lattice matching to reduce dangling bonds and lattice mismatches in heterojunctions (A-axis: 2.77 %, B-axis: 0.86 %). The α-Bi 2 O 3 /Co 3 O 4 heterojunction was synthesized using a coprecipitation strategy and showed a wide optical absorption range, with enhanced absorption beyond 420 nm, and ideal photoelectrochemical responses (the highest current intensity: 0.26 μA (cm 2 ) −1 ). Under simulated sunlight irradiation, the heterojunction removed 97.30 % and 85.32 % of methylene blue and tetracycline, respectively, within 120 min. The degradation was corroborated by total organic carbon removal efficiencies, with methylene blue achieving 92.51 % and tetracycline 87.33 % within 120 min, indicative of the effective mineralization process. Our density functional theory calculations indicated that α-Bi 2 O 3 and Co 3 O 4 generated an internal electric field during the Fermi equilibrium process, which caused the conduction band electrons of α-Bi 2 O 3 to flow towards the valence band of Co 3 O 4 , forming a Z-scheme electron flow. Electrons and holes could be separated and transported in heterojunctions with low interface resistance and then react with dissolved oxygen to generate highly active OH and O 2 − radicals, which induced the efficient degradation of organic pollutants. We explored the key influence of structure on catalytic activity on lattice matching and analyzed the catalytic mechanism of α-Bi 2 O 3 /Co 3 O 4 heterojunctions in terms of charge properties. Our findings should serve as a crucial reference for developing excellent structured photocatalytic materials.
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FUEL
·
2024
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IF 6.7
Juzhi Leng,Xinru Yang,Qi Zeng,Wenting Chen,Shupeng Guo,Min Zhong,Lili Liu,Yunlei Chen,Pengju Yang,Mingqi Li
Photochemical reduction of CO 2 (CO 2 RR) to syngas is an attractive approach for carbon–neutral recycling. Manipulating binding strength to reactive species on catalyst surfaces is challenging but essential for achieving efficient syngas production with a desired CO/H 2 ratio. Here, we demonstrate that the binding strength to key reaction intermediates (*CO 2 , *H and *CO) on the Co 3 O 4 surface can be fine-tuned by incorporating varying amount of Zn atoms. Dedicated experiments and theoretical simulations unveil that Zn doping allows for simultaneous control of both CO 2 adsorption/activation and the adsorption affinity of *CO on Zn-Co 3 O 4 catalysts, resulting in a significant enhancement in CO 2 to CO conversion. Moreover, Zn doping can alter the hydrophilicity of the catalyst surface, affecting the water adsorption behavior and adjusting the hydrogen evolution reaction (HER) activity. As a result, the CO/H 2 ratio can be readily tuned via varying the Zn doping level. This study presents an effective and economical method approach to manipulate the electronic structure of catalyst surfaces for controlling the kinetics of CO 2 RR and HER reactions, providing valuable insight into the design of highly active transition metal oxides (TMOs) based photocatalysts for syngas production with a tailored CO/H 2 ratio.
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INORGANIC CHEMISTRY
·
2024
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IF 4.3
Hui-Min Xu,Hong-Rui Zhu,Zhi-Jie Zhang,Chen-Jin Huang,Ting-Yu Shuai,Qi-Ni Zhan,Gao-Ren Li
A long-term goal of rechargeable zinc–air batteries (ZABs) has always been to design bifunctional electrocatalysts that are robust, effective, and affordable for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). It has become a feasible method to construct metal/metal oxide interfaces to achieve superior electrocatalytic performance for ORR and OER by enhanced charge transfer. In this study, Co/Co3O4 heterojunctions were successfully prepared and encased in porous N-doped mesoporous carbon (Co/Co3O4@NC) via a simple condensation-carbonization-etching method. The extensive specific surface area of Co/Co3O4@NC facilitates effective interaction between the electrolyte and the catalyst, thereby enabling sufficient exposure of active sites for the ORR and the OER, consequently enhancing the rate of transport of active species. The well-designed Co/Co3O4@NC delivers superior ORR catalytic activity with a half-wave potential of 0.82 V (vs RHE) and a low overpotential of 347 mV at 10 mA cm–2 for OER in alkaline solution. The power density of Co/Co3O4@NC-based alkaline aqueous ZAB (156.5 mW cm–2) is superior to the commercial Pt/C + IrO2-based alkaline aqueous ZAB, and the cycling stability of ZAB is up to 220 h. In addition, Co/Co3O4@NC-based ZAB shows a high power density (50.1 mW cm–2). The construction of metal/metal oxide heterojunction encased in N-doped mesoporous carbon provides a novel route for the design of bifunctional electrocatalysts for high-performance ZABs.
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PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
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IF 4.7
Shifang Cheng,Junfang Ding,Yakai Chen,Ganen Pan,Xinya Feng,Xingliang Xu,Jing Xu
Catalytic furfural (FF) into high value-added furfuryl alcohol (FOL) is a very important biomass improvement process and remains a challenging task. Herein, a series of Co-based composite oxide (CoMgAl-LDO) catalysts with highly dispersed Co 3 O 4 -based spinel oxide nanoparticles were synthesized by the topological transformation of Co-based ternary layered hydroxides (CoMgAl-LDH) under calcination conditions and tested for catalytic transfer hydrogenation of FF to FOL using isopropanol (2-PrOH) as hydrogen donor. The CoMgAl-LDO, especially Co 1.5 Mg 1.5 Al 1 -LDO calcinated at 500 °C (Co 1.5 Mg 1.5 Al 1 -LDO-500) offered the outstanding catalytic performance for the catalytic transfer hydrogenation of FF to FOL (99.7 % FF conversion and 95.9 % FOL selectivity), which was attributed to effectively dispersed active sites, abundant acid-base sites and mesoporous structure. Additionally, the Co 1.5 Mg 1.5 Al 1 -LDO-500 catalyst manifested good stability with wider universality to other carbonyl compounds, making the catalytic system extremely economical and practical in various biomass hydrogenation processes.
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ELECTROCHIMICA ACTA
·
2024
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IF 5.5
Xusen Cheng,Yanping Wang,Yunfeng Qiu,Yanxia Wang,Miao Yu,Zhuo Ma,Tiedong Sun,Shaoqin Liu
Metal oxides rich in oxygen vacancies (O v ) possess excellent intrinsic conductivity, variable valence metal center and high capacitance, which were potential candidates as microbial fuel cells anode. However, their high bacterial toxicity greatly hindered the activity of biofilm. To solve this issue, in this work, polydopamine (PDA) covered capacitive O v doped Co 3 O 4 nanosheets were designed and successfully grown on carbon cloth (CC). The introduction of O v significantly promoted the charge storage, the net charge and the accumulated charge were 217.1 and 2680.3 C/m 2 , respectively, surpassed Co 3 O 4 anode without O v . In addition, O v also decreased the charge-transfer resistance ( R ct ), effectively accelerating EET. The R ct of PDA/O v -Co 3 O 4 @CC was 29.51 Ω, lower than CC (382.10 Ω). The cover of PDA prevented the direct contact between metal ions and microorganisms, greatly enhanced the bacterial viability. The power density of MFCs with PDA/O v -Co 3 O 4 @CC anode was 2.77 W/m 2 , 1.45 times higher than that of bare CC (1.90 W/m 2 ). In addition, PDA/O v -Co 3 O 4 @CC anode displayed excellent coulombic efficiency and daily COD removal amount (23.5 % and 147.6 mg/L/d), higher than the control groups. The community analysis showed the abundance of Geobacter on PDA/O v -Co 3 O 4 @CC anode was 91 %, higher than other anodes. Present study developed a facile and effective PDA coating strategy to simultaneously enhance the biocompatibility and capacitance of O v -rich metal oxides, which will be a promising method for the preparation of high performance MFCs anode.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xinyang Wang,Xinyu Luo,Rui Li,Yu Chang,Jianbiao Peng,Weilai Wang,Haijin Liu,Guangxuan Yan,Pengkun Wei,Zhiguo Cao
Florfenicol (FLO) is a broad-spectrum halogenated antibiotic (containing F and Cl atoms), and the discharged FLO in wastewater exhibits potential biotoxicity. Peroxymonosulfate (PMS) activation can generate reactive oxygen species (ROSs) to realize efficient degradation of organic pollutants. Herein, Zn-substituted Co 3 O 4 (Zn x Co) catalysts were prepared and applied in PMS activation for FLO degradation. The physicochemical properties were systematically studied by combining experiments and density functional theory (DFT) calculation. The Zn partial substitution induced electron rearrangement and promoted oxygen vacancy (OV) formation in Co 3 O 4 . Zn 0.03 Co catalyst exhibited superior FLO removal, achieving a higher reaction rate of 0.112 min −1 than Co 3 O 4 (0.053 min −1 ). The FLO degradation was highly dependent on the factors of PMS/Zn 0.03 Co/FLO dosage, temperature, initial pH, and coexisting inorganic anions. The Zn 0.03 Co also displayed outstanding performance in PMS activation for degradation of various typical organic pollutants. Electron paramagnetic resonance (EPR) spectra and quenching experiments indicated that both radical species ( · OH , SO 4 · - , and · O 2 - ) and nonradical species ( 1 O 2 ) contribute to FLO removal. The redox cycle of Co 3+ /Co 2+ and OVs played an essential role in PMS activation. The electron structure of FLO and parameters of PMS adsorbed on Zn x Co were calculated. The longer length of Co O and O O bonds for the adsorbed PMS could enhance its activation to generate ROSs. The intermediates were detected, and five degradation pathways were proposed. The acute and chronic toxicities of intermediates suggested that the dechlorination process is important for the toxicity attenuation of FLO. This study clarified the performance enhancement mechanism of Zn substitution on FLO degradation by PMS activation using Co 3 O 4 based catalyst, which favors the development of PMS-based advanced oxidation processes for wastewater treatment.
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Chemosensors
·
2024
·Vol. 12
·期 6
·104
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IF 3.7
Yanyan Xing,Pingping He,Deyong Wang,Yuan Liang,Xing Gao,Xiaohong Hou
Colorimetric biosensor-based nanozymes have received considerable attention in various fields thanks to the advantages of the simple preparation, good stability, and regulable catalytic activity of nanozymes. In this study, a bimetallic nanozyme Fe3O4@Co3O4/CN was prepared via the high-temperature calcination of Fe3O4-PVP@ZIF-67. The material retained its skeletal structure before calcination, which prevented the aggregation of nanoparticles and exposed more active sites of the nanozyme, substantially enhancing the intrinsic dual enzyme-mimetic activities, including peroxidase- and oxidase-like activities. In particular, Fe3O4@Co3O4/CN with oxidase-like activity catalyzed the colorless tetramethylbenzidine (TMB) to become blue oxTMB with oxygen. Reducing glutathione (GSH) could inhibit the above oxidation reaction. In contrast, with respect to the existence of mercury(II), GSH bound to mercury(II) due to the strong affinity between mercury(II) and -SH, thus eliminating the inhibition and restoring the oxTMB signal. A simple and effective colorimetric sensor was fabricated to detect mercury(II) based on the above principles. The proposed measurement had a linear range of 0.1–15 μM and a limit of detection (LOD) of 0.017 μM. It was shown that the established colorimetric sensing system could be successfully applied to detect mercury(II) in water samples, and the Fe3O4@Co3O4/CN nanozyme proved to be a promising candidate for biosensing application.
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危险品化学品经营许可证（带存储）