CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tao Li,Weikun Sun,Jian Zhang,Shengqin Liu,Hongbin Chen,Zumin Qiu,Jason Chun-Ho Lam
Herein, an efficient and stable catalyst of Co 3 O 4 @LDH-AC was innovatively prepared through uniform loading of an activated carbon substrate with Mg/Al layered double hydroxide (Mg/Al-LDH) followed by dispersing Co 3 O 4 nanoparticles in the confined space of LDH. This unique flower-like spherical structure significantly improved the adsorption capacity and would increase the concentration of reactants in the confined space. Experimental results showed that levofloxacin (LFX) completely degraded in 4 min with the addition of µM peroxymonosulfate (PMS). The fast conversion of Co 2+ and Co 3+ in catalyst for the generation of highly reactive species is revealed via EPR, in-situ Raman, in-situ FT-IR, and XPS. Further tests of 5Co 3 O 4 @LDH-AC in effluent of hospital wastewater treatment showed that it not only possessed strong anti-interference capabilities, but also maintained stable catalytic activity in fixed-bed reactor for a long operation time. Therefore, the excellent catalytic performance in confined space offers the possibility of application for the degradation of micropollutants in real pharmaceutical wastewater discharged from hospital (800–1200 tons/day, COD > 150 mg/L).
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高影响因子
FUEL
·
2025
·
IF 7.5
Zheng Yang,Zeyang He,Vadim Efimov,Feitao Fan,Kuzmin Anton,Ting Bian,Shitan Yan
The development of efficient and durable bifunctional electrocatalysts is crucial for large-scale hydrogen production, yet remains challenging due to the sluggish kinetics of the oxygen and hydrogen evolution reactions. In this work, we report the rational design of a boron-doped Co 3 O 4 /CoMoO 4 heterostructure grown on nickel foam (B-Co 3 O 4 /CoMoO 4 /NF) as a robust bifunctional electrocatalyst for alkaline water splitting. By integrating B doping with Mo-induced surface reconstruction, the catalyst features abundant oxygen vacancies and optimized electronic configurations, which together accelerate reaction kinetics and improve stability. Electrochemical tests reveal that B-Co 3 O 4 /CoMoO 4 /NF requires only 299 mV to achieve 50 mA cm −2 for the OER and 255 mV to reach 50 mA cm −2 for the HER, accompanied by low Tafel slopes. The catalyst exhibits nearly unchanged activity during extended operation. In a two-electrode configuration, it delivers 50 mA cm −2 at a cell voltage of 1.741 V and maintains stable performance for 40 h, underscoring its strong potential for hydrogen production. This study provides a cost-effective and scalable strategy to construct heterostructure-doping dual-regulated catalysts with excellent bifunctional activity in renewable energy conversion.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 22
·13192-13202
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IF 2.599
Meng Yanshuang,Wang Gongrui,Xiao Mingjun,Duan Chaoyu,Wang Chen,Zhu Fuliang,Zhang Yue
In this work, a novel composite of Co 3 O 4 nanoparticle and carbon nano-onions (CNOs) is synthesized by using ionic liquid as carbon and nitrogen source through a facile carbothermic reduction followed by low-temperature oxidation method. The SEM and HRTEM images reveal that the Co 3 O 4 particles are homogenously embedded in the CNOs. Due to the unique nano-structure, the electrolyte contacts well with the active materials, leading to a better transfer of lithium ions. Moreover, the unique nano-structure not only buffers the volume changes but also facilitates the shuttling of electrons during the cycling process. As a result, the electrode made up of Co 3 O 4 /CNOs composite delivers favorable cycling performance (676 mAh g −1 after 200 cycles) and rate capability (557 mAh g −1 at the current of 1 C), showing a promising prospect for lithium-ion batteries as anode materials.
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高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 16
·7194-7205
·
IF 9.931
Lan Lan,Zhengkang Shi,Qian Zhang,Yuanzhi Li,Yi Yang,Shaowen Wu,Xiujian Zhao
A sample of Co3O4 mesoporous nanorods (Co3O4-MNR) with a considerable number of Co2+ vacancy defects was prepared by a facile method. Co3O4-MNR exhibits highly effective photothermocatalytic activity and excellent durability for the gas-phase oxidation of benzene (a recalcitrant poisonous air pollutant) under UV-visible-infrared illumination from a Xe lamp. It is discovered for the first time that the presence of Co2+ vacancies in Co3O4-MNR massively enhances the photothermocatalytic activity of Co3O4. Compared to a commercial Co3O4 sample (Aladdin) with a smaller number of Co2+ vacancies and TiO2 (P25), the CO2 production rate of Co3O4-MNR is massively increased by 165 and 309 times, respectively. Co3O4-MNR exhibits efficient photothermocatalytic activity for benzene oxidation even under the visible-infrared illumination of λ > 690 nm. The catalytic oxidation of benzene on Co3O4-MNR under the illumination of the Xe lamp follows a mechanism of solar-light-driven thermocatalysis. The experimental evidence of CO-TPR as well as theoretical evidence of density functional theory (DFT) calculations demonstrate that the presence of Co2+ vacancies in Co3O4-MNR significantly increases the activity of the lattice oxygen in Co3O4, thus massively promoting the thermocatalytic activity of Co3O4. Interestingly, a novel photoactivation on Co3O4, quite different from the conventional photocatalysis of semiconductor photocatalysts such as TiO2, is discovered to considerably increase the solar-light-driven thermocatalytic activity of Co3O4-MNR. By combining the experimental evidence of isotope labeling, CO-TPR, and FTIR with the DFT calculations, we obtain a deep insight into the novel photoactivation: the illumination from the Xe lamp enhances the activity of the lattice oxygen in Co3O4-MNR, thus considerably promoting the solar-light-driven thermocatalytic activity of Co3O4-MNR.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2026
·
IF 3.7
Nana Sun,Hongmei Dong,Jian Liu,Jianbo Hu
To improve the dispersibility and emulsification performance of magnetic nanoparticles, this study first synthesized three modified magnetic nanoparticles (Co 3 O 4 @HPAM) with different monomer ratios and characterized their physical properties. On this basis, the effects of the modified magnetic nanoparticles with different monomer ratios on the emulsification and viscosity reduction of thick oil were investigated by stability and rheology; finally, the emulsification and viscosity reduction mechanism was revealed by combining the zeta potential, surface tension, contact angle, and oil droplet distribution. The results showed that Co 3 O 4 @HPAM with three different monomer ratios was successfully synthesized and exhibited good dispersibility. With the increase of monomer ratio, the emulsion water fraction decreased first and then increased, and the viscosity reduction decreased first and then increased. At a mass fraction of 0.04%, the sample with a 15% monomer ratio exhibited the lowest water separation rate (6.45% at 4 h) and the highest viscosity reduction rate (97.93%). This phenomenon occurs because, at a 15% monomer ratio, the modified magnetic nanoparticles have a higher negative charge, a larger contact angle, lower oil-water interfacial tension, and smaller, more uniformly distributed oil droplets. This study offers a theoretical foundation for using magnetic nanoparticles in heavy oil emulsification to reduce viscosity.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Qiuxiang Liu,Jinhui Fang,Sulin Ni,Shasha Tang,Zhiqiao He
A hybrid electrode comprised of Pd and Co 3 O 4 supported on Ni foam (Pd-Co 3 O 4 /Ni foam) was applied toward the dechlorination of 2,4-dichlorophenoxyacetic acid (2,4-D). The effects of the reaction condition, such as Co 3 O 4 and Pd loading, current density, initial concentration of 2,4-D, temperature and dissolved anions, on the electrochemical dechlorination process were investigated and interpreted based on an indirect reduction mechanism via active atomic H*. The optimal Pd and Co 3 O 4 loading were determined to be 0.47 and 0.51 mg/cm 2 , respectively. A highest current efficiency of 12.10% was obtained at a current density of 1.50 mA/cm 2 , an initial 2,4-D concentration of 50 mg/L and reaction temperature of 298 K, and the apparent activation energy of 2,4-D dechlorination by the Pd-Co 3 O 4 /Ni foam electrode was calculated to be 42.33 × 10 3 J/mol. In addition, dissolved anions such as S 2- , SO 3 2- and NO 3 - suppress the catalytic activity, whereas HCO 3 - and Cl - have a negligible effect on the reaction process. The Pd-Co 3 O 4 /Ni foam electrode can also be applied to the dechlorination of 2,4-D in natural water bodies as well as other chlorinated organic compounds, such as chlorophenols.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2026
·
IF 17.2
Qi Tang,Bomiao Wang,Chongtai Wang,DaoXiong Wu,Ziming Cheng,Huimin Han,Leiyun Han,Huaxia Chen,Yingjie Hua
This paper proposes a multi-level structure design strategy, a dense cobalt oxide layer ( d -Co 3 O 4 ), a cobalt oxide catalytic layer ( h -Co 3 O 4 ), and an amorphous molybdenum oxide ( a -Mo x O y ) co-catalytic layer are constructed layer by layer on nickel foam (NF) through the combination of electro-deposition and oxidation. The a -Mo x O y / h -Co 3 O 4 / d -Co 3 O 4 /NF composite catalyst with both high catalytic activity and high stability was thus prepared. The main function of the d -Co 3 O 4 layer is to prevent NF from coming into direct contact with acidic media to stop its electrochemical corrosion. The h -Co 3 O 4 catalytic layer thus acquires a larger specific surface area, thereby exposing more active sites. The main function of the a -Mo x O y co-catalytic layer is to regulate the electronic structure on the surface of h -Co 3 O 4 , reduce the electron cloud density of the Co active sites, and thereby promote the adsorption and oxidation of the oxygen in a water molecule on it. The electrochemical test results show that the overpotential of a -Mo x O y / h -Co 3 O 4 / d -Co 3 O 4 /NF at a current density of 10 mA cm –2 is 254 mV, the Tafel slope is 118 mV dec –1 , and the stability exceeds 12 h in 0.5 mol L –1 H 2 SO 4 . Raman, X-ray photoelectron spectroscopy characterization and theoretical calculations indicate that the a -Mo x O y -Co 3 O 4 interface promotes the transfer of electrons from Co to Mo, optimizes the electronic structure of the active site, and reduces the adsorption and desorption energy barriers of the reaction intermediates OOH*, OH* and O* thereby enhancing the oxygen evolution reaction performance of the catalyst. This study provides a new structural design strategy for constructing stable transition metal-based oxide catalysts on NF for acidic oxygen evolution reaction.
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2026
·Vol. 40
·期 9
·e70633
·
IF 4.3
Wang Ye,Haoyue Xu,Jun Zhang,Xinru Liu,Yingxi Wang,Ling Li
The persistence and environmental hazards of antibiotic residues make the efficient removal of such pollutants from aquatic environments critically important. However, metal–organic framework (MOF) catalysts often face challenges in practical applications, such as poor structural stability and easy leaching of metal ions. In this study, using Co-MOF as a precursor, Co 3 O 4 -based catalysts rich in different concentrations of oxygen vacancies were successfully prepared through pyrolysis combined with sodium borohydride reduction and were employed for the efficient activation of peroxymonosulfate (PMS) to rapidly degrade oxytetracycline (OTC). The catalyst possessed excellent reaction kinetics, enabling rapid PMS activation and efficient OTC degradation. Radical quenching experiments and EPR analysis revealed that the degradation process follows a synergistic radical and nonradical mechanism, in which 1 O 2 and SO 4 • − play dominant roles. Furthermore, possible degradation pathways of OTC were proposed, and the ecotoxicity of its transformation products was evaluated. The results suggest that most intermediates have lower predicted toxicity than the parent compound. The catalyst also demonstrated good degradation performance and applicability in real water samples and for various pollutants. This study provides a new strategy to address the structural instability of MOF powder materials in catalytic applications.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2026
·
IF 7.9
Fei Yan,Wenhui You,Guangle Zhou,Lina Wei,Xiaolong Yang,Luao Wu,Jun Ke,Lidong Wang
This study synthesized Co 3 O 4 by calcining ZIF-67, and further prepared Co 3 O 4 -V O -3 catalyst rich in oxygen vacancies through NaBH 4 reduction. Co 3 O 4 -V O -3 can activate peroxymonosulfate (PMS) to efficiently degrade acetaminophen (APAP). The experimental results indicate that the optimal dosage of NaBH 4 for reducing Co 3 O 4 is 1:1, and the optimal reduction time is 3 h. Under the reaction conditions of 25 °C and pH= 7, 0.1 g/L Co 3 O 4 -V O -3 can degrade over 98.5% of APAP within 5 min, which is much faster than the activity of the original Co 3 O 4 catalyst. XPS analysis showed that the content of Co 2+ and oxygen vacancies in Co 3 O 4 -V O -3 was significantly higher than that in Co 3 O 4 , indicating that the reduction treatment of NaBH 4 resulted in the generation of a large number of oxygen vacancies in Co 3 O 4 . Co 3 O 4 -V O -3 has good environmental tolerance and can maintain good performance in a wide pH range (5−11) and under the interference of various inorganic anions. The results of free radical quenching experiments and EPR tests indicate that multiple reactive oxygen species are generated in the Co 3 O 4 -V O -3/PMS system, among which O 2 •− and 1 O 2 contribute the most to the degradation of APAP. This study provides an efficient and environmentally tolerant catalyst for activating PMS to degrade APAP, providing a reliable option for the removal of recalcitrant pollutants in actual water bodies.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xu Ge,Ke Xu,Zhiwen Liu,Xiaolong Liang,Jing Liang,Yuanjiao Li,Xueliang Mu,Jinxuan Liu
Lattice defect engineering and support modification are effective strategies for modulating catalyst electronic structures and enhancing the intrinsic activity. This study reports the in situ synthesis of a Bi and Ni codoped Co3O4 catalyst on carbon paper (BiNi-Co3O4/CP) via a one-step molten salt method, integrating dual strategies. Bi doping, with its larger atomic radius, induces abundant lattice defects in the Co3O4 surface, optimizing the electronic structure of Co active sites and markedly boosting the inherent catalytic activity. Concurrently, the synergistic interaction between Ni and Bi facilitates the formation of a tailored porous carbon support, which increases the active site exposure and promotes bubble desorption. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) confirms that the formation of the *OOH intermediate is significantly lowered by BiNi-Co3O4/CP, as is interfacial water adsorption. In 0.5 M H2SO4 solution, the BiNi-Co3O4/CP catalyst demonstrates outstanding performance for the acidic oxygen evolution reaction (OER), achieving an ultralow overpotential of 275 mV at 10 mA cm–2 with 110 h stability. This work establishes the synergistic “lattice defect-support modification” approach as a paradigm for designing acidic OER electrocatalysts with high efficiency and stability.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Xiaoxia Hu,Xin Yang,Chunhua Wang,Tiantian Tan,Xiaojie Liu,Xiaodan Liu
Biothiols, such as glutathione (GSH) and L-cysteine (L-Cys), were essential for maintaining human physiological homeostasis, and their abnormal levels are closely associated with various diseases. Herein, a composite nanoenzyme Co3O4/g-C3N4 with significantly enhanced peroxidase-like activity was successfully synthesized by combining ZIF-67-derived Co3O4 with graphitic carbon nitride (g-C3N4). The 3,3′,5,5′-tetramethylbenzidine (TMB) could be efficiently oxidized to blue TMB (oxTMB) by Co3O4/g-C3N4 in the presence of H2O2, while biothiols (GSH and L-Cys) inhibited this catalytic reaction due to their antioxidant properties, leading to a visible color fading. Based on the mechanism, a colorimetric detection method was established for quantitative analysis of GSH and L-Cys with linear ranges of 0~30 μM for GSH and 1~30 μM for L-Cys, respectively. Moverover, a convenient smartphone-assisted sensing platform was established for detection of GSH and L-Cys benefiting from the Co3O4/g-C3N4 based colorimetric strategy. These established methods had been applied to detect GSH and L-Cys in human urine, which showed great potential for self-health monitoring.
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高影响因子
Molecular Catalysis
·
2026
·
IF 4.3
Peiran Liu,Kang Wang,Xitao Wang
For propane dehydrogenation (PDH), cobalt-based catalysts are attractive candidates to replace Pt- and Cr-based systems, yet their practical application is hindered by rapid deactivation through sintering and coke deposition. In this work, we report a hybrid synthesis strategy to fabricate a Co–Al 2 O 3 catalyst (Co-Al 2 O 3 -INC) with atomically-dispersed Co 2+ sites strongly anchored in the γ-Al 2 O 3 . In contrast to an impregnated catalyst (Co-Al 2 O 3 -IMP) that forms reducible Co 3 O 4 clusters and suffers severe deactivation, the Co-Al 2 O 3 -INC catalyst exhibits high stability with propane conversion decreasing only marginally from 27.8% to 23.5% over 5 h. Extensive characterization confirms that the atomic dispersion of tetrahedral Co 2+ sites and the resulting strong metal–support interaction effectively suppress cobalt reduction and sintering, leading to significantly reduced coke formation. This study underscores the critical role of stabilizing isolated active sites via tailored synthesis for achieving highly stable PDH catalysts.
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高影响因子
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