CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Cui Zhang,Zhaoli Liu,Xuan Ye,Weijia Mao,Jie Dong,Bin Li,Xueping Zhou,Jinyan Luo,Jianxiang Wu
Enhancing catalytic activity of peroxidase-like nanozymes is essential for developing ultrasensitive lateral flow immunoassay (LFIA). The peroxidase-like catalytic process involves spin-dependent electron transfer during radical formation, and boosting single electron transfer (SET) efficiency is therefore critical to enhance catalytic performance. Here, we fabricated a strained-Co 3 O 4 exhibiting significant atomic compressive strain (ε xx = −3.34 %, ε yy = −6.52 %). The atomic-level displacement direction and distance information determined by atomic displacement analysis (ADA) offer detailed information for density functional theory computational modeling. We discovered that the strain engineering elevated crystal field splitting energy, which promotes the transition of Co 3 O 4 from low-spin states ( t 2g 6 e g 0 ) to high-spin states ( t 2g 4 e g 2 ), resulting in efficient SET performance. Spin-state modulation dramatically enhances the peroxidase-like catalytic efficiency, resulting in 28.0-fold and 11.8-fold lower Michaelis constants ( K m ) for TMB and H 2 O 2 , respectively, than those of the pristine-Co 3 O 4 . In addition, the strained-Co 3 O 4 was successfully employed in the development of LFIA for Xanthomonas oryzae pv. oryzae ( Xoo ) monitoring, and the LFIA achieved a detection sensitivity of 5 × 10 2 CFU mL −1 that was 20-fold higher than Au nanoparticles-based LFIA and was 2–3 orders of magnitude higher than commercial LFIAs. Our findings established a correlation between strain–spin orbit–peroxidase-like activity, offering a promising strategy for the rational design of nanozymes.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Kewei Zhang,Xi Chen,Yu Tong,Hongpeng Zhang,Haoqun Zeng,JianYu Ling,Mingzhe Zhang
Utilizing diverse material combinations in heterogeneous structures has become an effective approach for regulating interface characteristics and electronic structures. The g-C 3 N 4 /Co 3 O 4 heterostructures were fabricated by uniformly modifying Co 3 O 4 nanoparticles onto discrete clusters of g-C 3 N 4 nanosheets. Then, they were subsequently employed as positive electrode materials for assembling hybrid supercapacitors. According to the first-principles calculation, Co 3 O 4 and g-C 3 N 4 formed Co-N ionic bonds, establishing interfacial space symmetry-broken heterojunction and direct exchange and superexchange between ions at the interface and sub-interface. This resulted in a high-density spin–orbit hybrid heterogeneous polarization interface, significantly improving the quantum capacitance of heterojunction materials. Experimental results showed that the heterojunction had a specific capacitance of 2662 F g −1 at 1 A g −1 . When the power density was 750 W kg −1 , the energy density reached 128 Wh kg −1 . Even when the power density was 16850 W kg −1 , it could show an energy density of 62.5 Wh kg −1 . The g-C 3 N 4 /Co 3 O 4 heterojunction could realize high energy density charge storage as the cathode material of supercapacitors. The construction of heterogeneous polarization interfaces for high-energy quantum capacitors provides a new and effective method for the energy storage field.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jie Zhu,Qian Zhang,Peng Zhao,Lin Chen,Sudong Yang,Qiang Yan,Hongmei Li
Exploring robust and high-performance bifunctional electrocatalysts for overall water splitting is crucial for converting electric power to hydrogen energy, especially for the flexible utilization of intermittent green energy resources. Herein, pine-needle-like NiFe 2 O 4 @Co 3 O 4 heterostructure nanoarrays with abundant oxygen vacancies were deposited onto nickel foam via hydrothermal reaction , cathodic electrodeposition , and CaH 2 reduction. The synergistic approach boosts the electrochemical activity of catalyst by improving conductivity, mass diffusion efficiency, and active site quantity. Accordingly, the optimal electrocatalyst exhibits outstanding catalytic activity with high electrochemical stability in an alkaline medium, providing low overpotentials of 251 mV and 77 mV respectively to achieve 10 mA·cm −2 for catalyzing OER and HER . Moreover, the as-fabricated bifunctional electrocatalyst only requires a cell voltage of 1.56 V to enable a current density of 10 mA·cm −2 for realizing water electrolysis, outperforming many other previously reported catalysts. This work provides an inspiration for developing open structure materials with synergistic effect, and demonstrates a feasible method to synthesis high-efficiency electrocatalysts for water splitting.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Cong Wang,Shaoyi Jia,Yongchao Zhang,Yao Nian,Yan Wang,You Han,Yong Liu,Haitao Ren,Songhai Wu,Kexin Yao,Xu Han
SO 4 − and OH radicals are important oxidative species that play important roles in the oxidation of organic contaminants by peroxomonosulfate (PMS)/persulfate (PS) and Co 3 O 4 under acidic conditions. However, the facet effect of Co 3 O 4 on the catalytic oxidation of phenol by PS under alkaline conditions has not been investigated yet. In this study, we synthesized three Co 3 O 4 nanoparticles with different facets [rod (110), cube (100) and octahedra (111)]. The Co 3 O 4 rods show the highest catalytic reactivity in the oxidation of phenol by PS, followed by Co 3 O 4 cubes and Co 3 O 4 octahedra. Quenching experiments and EPR analysis rule out contributions of SO 4 − , OH, O 2 − and 1 O 2 to phenol oxidation and suggest that H-abstraction from phenol to phenoxyl radicals is an important pathway in all Co 3 O 4 -PS systems. The analysis of total organic carbon (TOC) and solid characterizations reveal that more than 96.6 % phenol has been transformed into polyphenols, instead of being mineralized into smaller organic molecules or CO 2 in the rod-PS-phenol system. The DFT (density functional theory) calculations further confirm that PS is more readily activated via a non-radical pathway on the Co 3 O 4 (110) plane with appropriate Co(II)-Co(II) distances, and the activated O O bonds then abstract H atoms from phenol molecules with the production of phenoxyl radicals, as well as SO 4 − and OH radicals. The produced phenoxyl radicals then link together to form dimers, trimers, oligomers and eventually insoluble polymers. This study not only enriches our understanding on the facet effect of different Co 3 O 4 in the oxidation of phenol, but also gives new insight into turning phenolic wastes into polyphenol "treasures".
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BIOSENSORS & BIOELECTRONICS
·
2016
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IF 7.476
Zhenfei Gao,Liqiang Zhang,Chi Ma,Qidong Zhou,Yushu Tang,Zhiqiang Tu,Wang Yang,Lishan Cui,Yongfeng Li
TiO 2 modified Co 3 O 4 acicular nanotube arrays (ANTAs) have been fabricated in this study, showing a good performance in glucose detection. In the experiment, the precursor Co(CO 3 ) 0.5 (OH)·0.11H 2 O acicular nanowire arrays (ANWAs) was first grown on the fluorine doped tin oxide (FTO) substrate by a hydrothermal method . Thereafter, the uniform pink precursor Co(CO 3 ) 0.5 (OH)·0.11H 2 O ANWAs was completely converted to the black Co 3 O 4 ANTAs thin film by alkaline treatment . After the decoration of TiO 2 , the TiO 2 /Co 3 O 4 ANTAs electrode exhibits a much higher current response to glucose compared with the Co 3 O 4 ANTAs. Importantly, this neotype composite structure of Co 3 O 4 enhances the glucose sensing performance by increasing specific surface area, additional reactive sites and synergistic effect , which make the TiO 2 /Co 3 O 4 glucose sensor show a high sensitivity of 2008.82 μA mM −1 cm −2 , a fast response time (less than 5 s) and a detection limit as low as 0.3396 μM (S/N=3). The TiO 2 /Co 3 O 4 ANTAs modified electrode exhibits a high selectivity for glucose in human serum, against ascorbic acid and uric acid .
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DALTON TRANSACTIONS
·
2015
·Vol. 45
·期 6
·2444-2453
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IF 4.197
Ying-juan Hao,Fa-tang Li,Jun Zhao,Rui-hong Liu,Xiao-jing Wang,Yu-pei Li,Ying Liu
Porous sphere-like tricobalt tetraoxide (Co3O4)–cobalt chloride hydrate (CoCl2·6H2O, CCH) heterojunctions are obtained using a one-step facile solution combustion route. The heterostructure is confirmed by XRD, HRTEM, and XPS measurements. Their photocatalytic performances are evaluated by the degradation of methyl orange (MO) and the reduction removal of Cr(VI) ions under visible light irradiation. The heterojunction containing 81.5 wt% Co3O4 and 18.5 wt% CCH exhibits the highest photocatalytic performance, for which the pseudo-first-order reaction rate constant is 10.0 and 8.7 times that of pure Co3O4 towards MO degradation and Cr(VI) reduction, respectively. This enhancement in activity can be attributed to the effective electron transfer from the conduction band of Co3O4 to that of CCH, which is verified with a double increase of the photocurrent valve of the heterojunction sample electrode in comparison with the bare Co3O4 sample electrode. Electron paramagnetic resonance, fluorescence spectrophotometry and scavenger experiments indicate that photo-induced holes, and hydroxyl and superoxide anion radicals are the active species responsible for the photo-oxidation of MO. The reasons for the formation of these species are discussed and proposed based on the band gap structures of Co3O4 and CCH. The recycling experiment results indicate that the activity can be regained by a remedial experiment.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Liyong Du,Heming Sun,Yi Liu
Metal-organic frameworks (MOFs) derived oxide semiconductors have drawn more and more attention in many fields due to their unique structural merits. Herein, hierarchical flower-like Mo-doped Co 3 O 4 derived Co-MOF has been synthesized through a solvothermal method and following annealing process. The gas sensing measurements show that the sensing properties of Mo-doped Co 3 O 4 sample are far superior than that of pure Co 3 O 4 . In particular, 1 at% Mo-doped Co 3 O 4 sample exhibits high response values of 92–50 ppm TEA at 180 °C, which are about 46 times than that of pure Co 3 O 4 sample. In addition, it shows short recovery time (33 s), excellent gas selectivity, good repeatability and long-term stability. The improved gas sensing performance can be ascribed to Mo doping and hierarchical flower-like microstructure.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Xuetao Liang,Yujie Zhao,Niandong Guo,Qi Yang
Carbon-based catalysts have the advantage of biological cleaning and cost-effectiveness in water treatment. This work used a two-step calcination method to prepare a novel nanometer composite material (CBC-1), where flake-like Cobalt oxide (Co 3 O 4 ) loaded on rice husk biochar. CBC-1 was used to activate PMS and degrade 2,4-dichlorophenoxyacetic acid (2,4-D) in the water phase. SEM , XRD , FT-IR, BET, XPS , EPR and other characterization methods showed that both sulfate radical and hydroxyl radical were involved in 2,4-D degradation. Both the high hydroxyl (-OH) content and Co (II) of the catalyst are beneficial to the activation of PMS. The pseudo-first order reaction rate constant of CBC-1 was 5.3 and 16 times that of pure Co 3 O 4 and biochar. This research provides new ideas for the application of carbon-based materials in the water treatment process and achieves the goals of treating waste water polluted by pesticides effectively and resource utilization of agricultural waste.
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Frontiers in Materials
·
2022
·
IF 3.985
Yang Jiangping,Zhang Zhe,Sun Siyuan,Wang Cheng
The development of transition metal oxides (TMOs) as electrocatalysts for oxygen evolution reaction (OER) has the potential to surpass the performance of noble-metal-based catalysts. In this work, a quenching rapidly strategy was used to synthesize Mo-modified Co3O4 nanosheet arrays as advanced catalysts. The resulting Mo-Co3O4 electrodes showed superior activity and reaction kinetics, with an overpotential of only 341 mV to drive a current density of 100 mA cm−2 and a Tafel slope of 69.0 mV dec−1. This improved performance is thought to be due to the formation of high-valence Co sites, which creates a synergistic effect. The ability to regulate the synthesis without causing obvious agglomeration and nucleation growth during annealing makes this method a promising approach for the design of other advanced functional materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Shuqi Hu,Yuying Liu,Shuangbao Wang,Xinyi Zhang,Pei Kang Shen
Design and synthesis of platinum catalysts within atomic level are of great significance for the practical application of fuel cells. We found that the ultrathin Co(OH) 2 nanoparticles can be converted into Co 3 O 4 –Co core-shell nanostructures through a thermal annealing process in reducing atmosphere, which are uniformly distributed on the surface of 3D graphene (3DG). The Co 3 O 4 –Co core-shell nanoparticles have been successfully transformed into Co 3 O 4 –Pt core-shell nanoparticles via a controlled replacement reaction. The Co 3 O 4 –Pt @3DG contains only a few atomic layers of Pt shell, and presents a high Pt utilization nanostructure. Besides, the 3D graphene serves as a catalysts carrier with open structure, and offers a three-dimensional molecular accessibility and conducive to mass transfer. Significantly, the optimized mass activity and specific activity of 1.018 A/mg Pt and 2.17 mA/cm 2 have been achieved on Co 3 O 4 –Pt @3DG at 0.9 V vs RHE , which are 7.6- and 8.1- times higher than those of Pt/C (0.134 A/mg Pt and 0.266 mA/cm 2 ), respectively. The high activity is mainly attributed to the ultrathin core-shell structure with an ultrahigh Pt utilization, and the interaction between the near-surface Co 3 O 4 and the surface Pt shell with a tensile strain to surface Pt shell, and the electrons transfer from Co to Pt.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2020
·Vol. 37
·期 6
·961-968
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IF 2.69
Dai Ping,Sun Xiaowei,Xu Dongyan,Tan Feng
Alumina supported bimetallic cobalt-iron oxide (Co 3 O 4 -Fe 2 O 3 /Al 2 O 3 ) catalyst was prepared via co-impregnation of boehmite with the mixture solution of cobalt nitrate and iron nitrate followed by calcination in air. X-ray photoelectron spectroscopy and high-resolution transmission electron microscope analyses confirmed the existence of highly dispersed Co 3 O 4 and Fe 2 O 3 nanoparticles in the as-prepared catalysts. The catalytic activity of Co 3 O 4 -Fe 2 O 3 /Al 2 O 3 was evaluated for the degradation of H-acid in aqueous solution by heterogeneous activation of peroxymonosulfate. The results indicated that the Co 3 O 4 -Fe 2 O 3 /Al 2 O 3 catalyst exhibited an identical initial activity but much better recyclability than Co 3 O 4 /Al 2 O 3 due to its low amount of metal leaching and possible redox circle of Co(II)/Co(III). Electron paramagnetic resonance spectroscopy and radical quenching experiments suggested that singlet oxygen ( 1 O 2 ) contributed much more than ·OH and SO 4 • to H-acid degradation, and the degradation mainly followed a nonradical reaction mechanism.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2013
·
IF 5.825
Yanhong Zu,Panpan Yang,Jianjian Wang,Xiaohui Liu,Jiawen Ren,Guanzhong Lu,Yanqin Wang
Ru/Co 3 O 4 catalyst prepared by a simple coprecipitation method, was used to catalyze the conversion of 5-hydroxymethylfurfural (HMF) into 2,5-dimethylfuran (DMF) for the first time and exhibited excellent catalytic performance. 93.4% yield of DMF was achieved at relatively low reaction temperature and H 2 pressure (130 °C, 0.7 MPa). Further studies showed that Ru is responsible for hydrogenation, while CoO x species played important role in the hydrogenolysis of hydroxyl groups. Besides, this catalyst also displayed a good reusability and can be used for 5 times without loss of the activity.
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