SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yaqi Wu,Jianhua Qian,Yanan Wang,Jinjuan Xing,Junhua Li,He Huang,Xueming Kang,Jiasheng Xu
Developing transition metal oxide-based catalysts with both high thermal stability and catalytic activity for the effective volatile organic compounds (VOCs) removal remains a major challenge in heterogeneous catalysis. In this work, a series of Cu, Mn, Co and Ni substituted Co 3 O 4 spinel catalysts with a large number of oxygen vacancies were produced as extremely stable and active substances for the oxidation of toluene. The CuCo 2 O 4 catalyst, prepared through transition metal substitution, demonstrated exceptional performance with T 50 , T 90 , and complete conversion temperatures of 204 °C, 220 °C, and 228 °C, respectively. Furthermore, the CuCo 2 O 4 catalyst displayed markedly enhanced thermal stability compared to other catalysts, which was crucial for practical implementation. Its superior catalytic activity originated from electron transfer between Co and Cu cations, facilitated by lattice oxygen, which increased the Co 3+ /Co 2+ ratio. This structural modification strengthened oxygen migration and reducibility within the spinel framework, facilitating efficient regeneration of lattice oxygen and rapid activation of adsorbed oxygen species. Kinetic analyses corroborated these findings, revealing that CuCo 2 O 4 possessed the lowest activation energy ( E a = 40.40 kJ/mol), thereby reducing the energy barrier for toluene oxidation. These results demonstrate that the CuCo 2 O 4 catalyst represents a promising candidate for practical applications, combining high catalytic activity for toluene oxidation with exceptional operational durability and thermal stability.
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·Vol. 13
·期 6
·120447
·
IF 7.2
Fenglan Fan,Lei Wang,Kang Guo,Xinyu Zhang,Shaomian Liu,Jie Xu,Hongli Chen,Jian Yu,Boxiong Shen,Wenqing Xu,Ziyi Zhong,Fabing Su
Currently, the primary challenge in industrial applications of CO-selective catalytic reduction of NO (CO-SCR) is the shortage of efficient catalysts that can tolerate the presence of oxygen (O 2 ). In this study, guided by density functional theory (DFT) calculations, we have developed an effective Co 3 O 4 catalyst incorporated with both oxygen vacancies (V O ) and cobalt vacancies (V Co ). This catalyst achieved 100 % NO conversion and 100 % N 2 selectivity at temperatures ranging from 200 to 350 °C, even in the presence of up to 5 vol% O 2 . DFT calculations and experimental results demonstrate a strong interaction between V O and V Co in the CO-SCR process. The presence of V Co enhances the NO adsorption on adjacent O atoms and promotes the formation of nitrite intermediates. Meanwhile, V Co and V O synergistically promote the dissociation of N-O bonds, thereby improving the NO conversion and the N 2 selectivity. This approach opens up new possibilities for designing advanced catalysts tailored for various environmental and industrial applications.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Ziheng Wang,Wenxuan Liu,Bo Jiang,Yuanshen Liu,Nan Sun,Qi Shao,Muchun Wan,Yuhao Zhu,Bin Su,Xin Wang,Peng Peng,Chunxia Chen,Wei Ji
Exposing unsaturated sites by modulating the lattice ordering is very efficacious in optimizing the catalytic performance of catalytic materials. Paracrystalline materials, which are intermediate between amorphous and crystalline materials, integrate some of the excellent properties of both and are rich in atomically ordered-disordered intersections with unsaturated sites. These characteristics enable paracrystalline materials to demonstrate potentially superior catalytic activity that efficiently facilitates the redox conversion of lithium polysulfides (LiPSs). However, paracrystalline materials have not been applied to improve the electrochemical performance of lithium–sulfur (Li–S) batteries, and the modulation mechanism by which their unique paracrystalline features affect the adsorption and catalytic performance of electrocatalysts for LiPSs remains unrevealed. Herein, a paracrystalline Co3O4 hollow flower-shaped sphere (PC-Co3O4 HFS) was engineered and employed as an efficient electrocatalyst for Li–S batteries. By modulation of the formation of the ordered-disordered intersections within the PC-Co3O4 HFS, numerous oxygen vacancies and active sites were created. This enables the PC-Co3O4 HFS to exhibit robust adsorption and catalytic capabilities, thereby effectively anchoring LiPSs and significantly accelerating the redox kinetics of sulfur species. Moreover, the Li+ transport behavior is also significantly improved by the PC-Co3O4 HFS. The batteries employing the PC-Co3O4 HFS exhibited a high discharge capacity of 818.74 mA h g–1 at 4.0 C and retained a capacity of 545.06 mA h g–1 after 500 cycles at 2.0 C, demonstrated excellent rate performance and cycling stability. Even at a high sulfur loading of 13.4 mg cm–2, the batteries with the PC-Co3O4 HFS delivered an impressive areal capacity of 10.49 mA h cm–2. This study successfully demonstrates the ability of paracrystalline materials to enhance the electrochemical performance of Li–S batteries, deepening the comprehending of the lattice ordering degree effect in Li–S electrochemistry.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2025
·Vol. 15
·期 6
·538
·
IF 4
Jinlong Wen,Ziying Hu,Hongpeng Jia,Jing Chen,Can-Zhong Lu
The construction of multicomponent transition metal oxide catalysts can effectively increase the surface defects of catalysts, and bring a synergistic effect from different components, thus enhancing the generation of reactive oxygen species and improving the catalytic activity of catalysts for volatile organic compounds (VOCs) oxidation. In this article, CuO/Co3O4catalysts with abundant oxygen vacancies for the degradation of ethyl acetate was prepared by a simple impregnation method. The effect of the ratio of Co/Cu on the redox capacity, oxygen vacancy, active oxygen species and catalytic oxidation activity of ethyl acetate were studied. The 90% conversion and mineralization temperatures of ethyl acetate for the optimal catalyst Co3O4-20Cu are 211 and 214 °C (WHSV = 60,000 mL/(g·h), 1000 ppm ethyl acetate), which also shows good stability and excellent water vapor resistance. Compared with pure Co3O4, the CuO/Co3O4catalysts have more oxygen vacancies, provide more reactive oxygen species, allowing the catalyst better low-temperature reduction. Through in situ DRIFTS study, the intermediates of ethyl acetate decomposition were analyzed, then a possible catalytic oxidation mechanism of ethyl acetate on the Co3O4-20Cu catalyst was proposed. In addition, we prepared a Co3O4-20Cu/cordierite monolithic catalyst on the basis of Co3O4-20Cu, exhibiting a good catalytic activity in degradation of ethyl acetate.
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Hongxia Fang,Guoliang Zhu,Yunhu Hu,Chuncai Zhou,Mai Xu,Mu You,Jing Zhao,Shuwen Xue,Jianfeng Zhang,Guijian Liu
The sulfate radical-mediated advanced oxidation processes are emerging as an effective technology for water purification. Herein, flower-like C/CoO/Co 3 O 4 heterojunctions with abundant oxygen vacancies (OVs) were fabricated by a facile method and employed as excellent activators for peroxymonosulfate activation towards tetracycline (TC) degradation. The emerging OVs in C/CoO/Co 3 O 4 not only facilitate electron transfer for accelerating the redox cycle of Co 3+ /Co 2+ but promote the generation of non-radical 1 O 2 involved in TC elimination. Consequently, 99 % of TC (20 mg/L) could be removed by the C/Co-2/PMS system within a period of 80 s, more superior to that of commercial CoO (33 % in 80 s) and Co 3 O 4 (28 % in 80 s), respectively. In addition, the C/Co-2/PMS system displayed excellent activities for different pollutant degradation, such as rhodamine B (99 % in 80 s), congo red (99 % in 80 s), and ciprofloxacin (78 % in 80 s). The quenching experiment together with EPR characterization indicated that the produced SO 4 •- / • OH/ 1 O 2 species participated in TC removal with the sequence of SO 4 •- > 1 O 2 > • OH. Besides, the effects of catalyst dosage, TC concentration, PMS concentration, inorganic anions and organic matter on TC degradation were studied. The cyclic experiment demonstrated the robust stability of the as-prepared sample. After 7 cycles, the C/Co-2/PMS system can still remain a TC degradation rate of 88 % with low Co (0.05 mg/L) ions leakage. Finally, the possible reaction mechanism of the current catalytic system was explored and discussed in detail.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lina Chen,Rui Yao,Yijie Zhang,Wei Li,Jinping Li,Guang Liu
The development of efficient oxygen evolution (OER) catalysts in neutral media is crucial for the production of biomixed fuels and chemicals. The unique reaction environment makes the reaction kinetics sluggish and poses significant challenges for catalyst design. Therefore, this study presents the synthesis of W, Cr-Co 3 O 4 electrocatalysts using the hydrothermal calcination method for neutral OER. The doping of W and Cr modulates the electronic structure of Co 3 O 4 and enhances electrical conductivity. Moreover, the double doping of W and Cr accelerates the catalyst's reconstruction, thereby improving catalytic activity. The optimized W, Cr-Co 3 O 4 demonstrates efficient OER catalytic performance in 1 M phosphate buffer solution, with an overpotential of 347 mV at a current density of 10 mA cm −2 and stable operation for over 100 h. This work deepens the understanding of the reconstruction mechanism of OER catalysts in a neutral environment and provides valuable insights for the design of stable and efficient catalysts.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Lihong Su,Lulu Wang,Xiaolin Yao,Xuechi Yin,Han Zhang,Man Zhao,Sijie Liu,Zonghan Wang,Jianlong Wang,Daohong Zhang
Lateral flow immunoassay (LFIA) biosensor is a paper-based tool and widely utilized in various fields. Here, we developed a novel LFIA biosensor by introducing Co 3 O 4 nanoparticles (NPs) as signal labels for highly sensitive detection of 3-amino-2-oxazolidinone (AOZ), a metabolite of furazolidone . The characteristic brown color of Co 3 O 4 NPs enabled AOZ to be visually detected by the LFIA. Significantly, the size of Co 3 O 4 NPs is relatively small compared with most of other signal labels, which could remarkably reduce steric hindrance , increase immunoreaction probability and shorten the analysis time. Under optimal conditions, the novel Co 3 O 4 NPs-LFIA could possess high sensitivity for the detection of AOZ with a detection limit of 0.4 ng mL −1 by naked eyes, which was at least 3-fold improved than that of the conventional gold nanoparticles (GNPs) based LFIA. Moreover, the detection could be achieved within 6 min and without cross-reactions with other analogue small molecules. Taking merits of convenience, rapid and sensitivity, the proposed Co 3 O 4 NPs-LFIA may be readily adapted for the detection of other small molecules.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Zhiyu Gong,Yueyue Zhong,Minghong Fan,Weiming Fang,Zhengfei Yang
Metal-organic frameworks (MOFs), with a particular focus on zeolite-imidazole frameworks (ZIFs), have garnered significant interest as potential templates for the fabrication of sensing materials. In this work, we fabricated a porous stick structure of S-Co 3 O 4 /Co/C through the two-step pyrolysis of stick-like ZIF-67 (ZIF-S). Various methodologies were utilized to investigate the structures and composition of the nanocomposites. The S-Co 3 O 4 /Co/C was further utilized as electrode components in electrocatalytic determination of H 2 O 2 . Thanks to the unique stick-like structure and the synergistic effects of Co 3 O 4 , Co, and carbon, the fabricated sensor showed wide linear range (0.5–4000; 4000–11,000 μM), high sensitivity (1.01; 0.90 μA μM −1 cm −2 ) and low detection limit (0.29 μM) for H 2 O 2 sensing. The study being presented is anticipated to offer a novel outlook on the possible utility of nanocomposites derived from MOFs in the realm of electrochemical sensing.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhe Liu,Zheng Li,Ruiqi Han,Zhenting Wu,Yanpeng Liu,Xin Tan,ShuangYan Meng,Yanrong Wang,Shanglong Peng
MXene has found widespread application in gas sensing applications through the formation of composite materials with metal oxides, with its excellent electrical conductivity and high specific surface area being its core advantages. However, during the synthesis of composite materials, MXene oxidizes to TiO 2 , leading to reduced electrical conductivity and a decrease in specific surface area. Additionally, MXene oxidation issues arise during gas sensing tests. To address these limitations, we developed a pre-oxidation doping strategy using nitrogen annealing, which preserves MXene's large specific surface area and conductivity during subsequent experiments. Experimental data confirmed that the pre-oxidation single-doping strategy retained the Ti 2p orbital characteristics, indicating that the treated MXene still maintains its two-dimensional material properties. The optimized Co 3 O 4 /N-MX7.5 composite exhibits peak ethanol sensing performance at 120°C, with improved selectivity attributed to enhanced conductivity due to nitrogen doping. This study establishes a methodological approach to mitigate MXene oxidation and functional group interference, advancing the rational design of MXene-based gas sensors.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yi Wang,Jiaxin Liu,Qixin Wang,Yuan Xu,Qianling Zhang
The electrocatalytic nitrate reduction reaction (NO 3 − RR) is a promising and economic green alternative to the traditional Haber-Bosch process for ammonia (NH 3 ) production. However, it suffers from high overpotential and poor NH 3 selectivity due to various competing reactions. In this study, we developed a CuO/Co 3 O 4 nanoneedle heterostructure catalyst grown on nickel foam. After electro-activation to Cu/Co 3 O 4 , it achieved nearly 100 % NH 3 selectivity in both alkaline and neutral electrolytes across a wide range of potentials. The catalyst showed a high NH 3 yield rate of 617.14 μmol h −1 cm −2 at −0.2 V vs. reversible hydrogen electrode along with an excellent stability over a 120-hour test. The mechanism involves CuO reducing to Cu, forming a heterostructure that modifies the electronic environment of Co sites, the synergistic Cu and Co 3 O 4 interfaces enhancing rapid *NO 3 adsorption and lowering the energy barriers for NH 3 production, thereby facilitating the overall efficiency even at low concentrations (0.01 M NO 3 − ).
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Jia Liming,Li Xinmei,Yang Rui,Yan Zhiqi
ZnO/Co 3 O 4 nanocomposite fibers were synthesized via electrospinning followed by controlled calcination , and their structural evolution and gas sensing performance were systematically investigated. Comprehensive characterization (XRD, SEM, FTIR, XPS) revealed that calcination temperature critically governs crystallinity, oxygen vacancy concentration, and morphology. The results showed that the prepared ZnO/Co 3 O 4 nanocomposite fibers at the 500 °C calcination temperature exhibited a complete morphology and a high concentration of oxygen vacancy (49 %), which promoted oxygen vacancy adsorption and redox reactions, enabling room-temperature operation with a response of 17.56 and a rapid response/recovery time (25/34 s) toward 500 ppm ethylene glycol at room temperature. Mechanistic studies demonstrated that the p-n heterojunction between n-ZnO and p-Co 3 O 4 facilitates interfacial charge transfer, generating built-in electric fields that enhance carrier mobility. This work provides a scalable strategy for designing energy-efficient gas sensors through synergistic optimization of heterojunction engineering and defect chemistry.
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2025
·
IF 4
Lichao Li,Tongrui Shao,Yang Su,Xiaodong Wang,Jian Lin
Water gas shift (WGS) reaction is crucial for removing CO impurity in industrial hydrogen production. Noble-metal-free Co-based species mainly serve as a support rather than dominant sites for this reaction. Here, a bulk Co 4 N nanospheres (Co 4 N-NS) catalyst is prepared via temperature programmed nitriding using Co 3 O 4 nanosphere precursor for low-temperature WGS reaction. It is found that the CO conversion can achieve 97.6% at 240°C, and the thermodynamic equilibrium conversion is reached at 250°C, which is unprecedentedly reported for Co-based catalysts. Moreover, the reaction rate reaches 19.84 mmol CO g cat −1 h −1 with a better stability, 4.5 times higher than that on Co 4 N-C from commercial Co 3 O 4 precursor. The characterizations and kinetic studies show that Co 4 N-NS enhances the H 2 O activation and promotes the CO adsorption, which renders a lower activation energy compared to Co 4 N-C for the WGS reaction. This study offers insights for designing cost-effective WGS catalysts with transition metal nitrides.
✓ 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）