Materials Today Communications
·
2024
·
IF 3.7
Rui Luo,Yuting Huang,Min Wang,Tong Yu,Kexin Tai,Lin Hu,Xiankun Wu
Advanced oxidation processes based on persulfate (PS-AOPs) have emerged as effective strategies for environmental remediation, with cobalt-based oxides serving as prominent catalysts for peroxymonosulfate (PMS) activation. In this study, we developed a highly active Co 3 O 4 /Al 2 O 3 catalyst (Co/AA) featuring ultrafine nanoparticles, synthesized via a facile approach using tannic acid (TA) as a coordinating agent and activated alumina as a robust support. Co/AA-0.1, as the representative catalyst, was characterized and exhibited outstanding performance in degrading rhodamine B (RB) via PMS activation. Our findings highlight TA's critical role in reducing Co 3 O 4 nanoparticle size, thereby increasing the availability of active sites. The degradation mechanism was elucidated through reactive oxygen species (ROS) quenching experiments and electron paramagnetic resonance (EPR) analysis, revealing that sulfate radicals (SO 4 •− ) are the dominant ROS. The high activity of Co/AA-0.1 is confirmed by analyzing X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller surface area and O 2 -temperature programmed desorption data of the samples. We also investigate the effects of various factors, such as anions, reaction temperatures, and PMS dosage, on RB degradation. Higher temperatures for treating the catalyst are found to reduce activity but improve stability. Notably, the catalyst synthesized through EDTA-assisted synthesis showed balanced activity and stability. Furthermore, the versatility of our synthesis method was demonstrated by successfully applying it to other supports, such as SiO 2 and TiO 2 , offering the development of more efficient and stable catalysts for environmental applications.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 28
·12535-12543
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IF 2.7
Bo Sun,Man Li,Lifeng Cheng,Qijian Li,Xiaowen Chen,Shengqi Wang,Wenhua Yan,Lei Wang,Fuxiang Wei,Qingliang Wang
Transition metal oxides (TMOs) have excellent electrochemical properties. However, they are commonly associated with short cycle lives, agglomeration, and lower electrical conductivity. To ameliorate these drawbacks, porous rod-shaped CuO@Co3O4 has been synthesized through calcination with optimized oxidation temperature by using CuCo-MOF-74 as a template. Due to the porous structure, the CuO@Co3O4 electrode significantly increases the contact area with the electrolyte and greatly improves the reaction kinetics. As a result, the CuO@Co3O4 electrode exhibits excellent electrochemical performance with a specific capacitance of 545.5 F g−1 at a current density of 1 A g−1. The capacitance retention at 10 A g−1 was 88.7% after 10 000 cycles. Furthermore, an asymmetric supercapacitor (SC) has been assembled with CuO@Co3O4 as the positive electrode and commercial reduced graphene oxide (RGO) as the negative electrode, and the device has exhibited an energy density of 38.2 W h kg−1 at a power density of 1268.3 W kg−1. Impressively, the capacitance retention remained 83.2% even after 10 000 cycles at a high current density of 10 A g−1. This performance has demonstrated the potential of CuO@Co3O4 as an anode material for SCs.
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CHEMICAL ENGINEERING JOURNAL
·
2018
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IF 6.735
Ruijie Xie,Jian Ji,Haibao Huang,Dongxue Lei,Ruimei Fang,Yajie Shu,Yujie Zhan,Kaiheng Guo,Dennis Y.C. Leung
Gas-phase VOCs decomposition generally produces intermediates and causes secondary air pollution. To avoid this issue, we proposed a novel method for a typical gaseous VOC (toluene) degradation via catalytic activation of peroxymonosulfate (PMS) in the liquid phase. Herein, activated carbon supported monodispersed Co 3 O 4 nanoparticles (Co 3 O 4 /AC) were prepared via a facile deposition method. It is highly efficient in PMS activation for toluene degradation due to the presence of Co-OH + species and well dispersed Co 3 O 4 on Co 3 O 4 /AC. A toluene removal efficiency of nearly 90% was maintained during the reaction, and few gaseous intermediates were discharged. Sulfate radical (SO 4 − ) and hydroxyl radical (HO ) derived from PMS activation played different roles during toluene oxidation and mineralization. Electron spin resonance (EPR) suggested that the generation of plentiful SO 4 − resulted in the superior toluene degradation, and the presence of HO can improve carbon mineralization. Radical quenching tests further confirmed that SO 4 − played a dominant role for toluene degradation, whereas the absence of HO inhibited the carbon mineralization. The toluene degradation pathway in the Co 3 O 4 /AC-PMS system was proposed based on the intermediates identified by GC–MS.
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ChemElectroChem
·
2018
·Vol. 5
·期 7
·1080-1086
·
IF 4.446
Qianfeng Liu,Zhiping Chen,Zhao Yan,Yao Wang,Erdong Wang,Sheng Wang,Shudong Wang,Gongquan Sun
Graphical Crystal plane activity : Spinel Co 3 O 4 nanomaterials are synthesized controllably with the specified morphologies of nanocubes, nanosheets, and nanoplates that exhibit different exposed planes: {100}, {110}, and {111}, respectively. The effects of the crystal planes on the activity for the oxygen evolution, oxygen reduction, and hydrogen evolution reactions are investigated in alkaline media. Insights into the relationship between the crystal planes of metal oxides and the catalytic activity of the oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and hydrogen evolution reaction (HER) are essential for developing efficient renewable energy technologies. Herein, spinel Co 3 O 4 nanomaterials were synthesized controllably with the specified morphologies of nanocubes, nanosheets, and nanoplates with different exposed planes of {100}, {110}, and {111}, respectively. The effects of the crystal planes of Co 3 O 4 on the activity for the OER, ORR, and HER were subsequently investigated in alkaline media. Different electrocatalytic performances are possibly attributed to the abundance ratios of Co 3+ /Co 2+ over the different exposed planes. The surface Co 3+ ions exhibit higher activity for the OER and HER, whereas the surface Co 2+ ions exhibit better performance for the ORR; moreover, higher electroconductivity enhances the polarization current for ORR and HER except OER.
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ChemistrySelect
·
2025
·Vol. 10
·期 3
·e202402822
·
IF 2
Linbo Chen,Yingying Zhu,Di Wang,Jinyuan Zhu,Yumeng Ren,Geng Chen
Graphical A novel Co─FCN heterojunction photocatalyst was synthesized by introducing Co 3 O 4 and fluorine into graphitic carbon nitride (CN) using a simple one-pot pyrolysis method. The photocatalytic activity was assessed through the photodegradation of Rhodamine B (RhB). The resulting Co─FCN photocatalyst demonstrated superior photocatalytic performance and stability compared to pure CN. Photocatalysis is an effective solution to degrade organic dye discharge in wastewater treatment due to its efficiency, environmental friendliness and cost-effectiveness. However, issues such as limited visible light absorption and rapid charge carrier recombination hinder its practical use. In this research, the heterojunction (Co─FCN) composed of carbon fluoride nitride and cobalt tetroxide (Co 3 O 4 ) was successfully prepared by a simple one-pot pyrolysis method. The obtained nanocomposites showed their efficiency as photocatalyst in the photodecomposition of Rhodamine B (RhB). The relationship between microstructure and properties of photocatalyst was studied in detail by means of characterization techniques. The results showed that the RhB degradation efficiency of Co 3 ─FCN was 92.91% within 60 min irradiation time. The results of free radical scavenging experiments show that superoxide anion (·O 2− ) and hydroxyl radical (·OH) are the main active species in Co─FCN composite catalysts. In addition, the potential degradation pathway of RhB was inferred based on the intermediates detected by liquid chromatography mass spectrometry (LC-MS), and the preliminary photocatalytic reaction mechanism of Co─FCN heterogeneous catalyst was constructed accordingly. Therefore, this research provides new insights into the preparation and modification of CN photocatalysts, thereby promoting the application potential of efficient photocatalysts in the degradation of organic pollutants.
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ChemCatChem
·
2024
·
IF 3.8
Yuxin Sun,Yunshuo Wu,Zhuoyi Zhang,Xuanhao Wu,Haiqiang Wang,Zhongbiao Wu
Graphical Ce-Pr co-doped Co 3 O 4 achieved 100% N 2 O conversion at 400 °C over Pr 0.02 Ce 0.2 Co 1 . The introduction of Ce facilitated the formation of oxygen vacancies, which were essential for N 2 O activation. But these Ce species strictly inhibited Co 3 O 4 crystallization and surface exposure, which were unfavorable to N 2 O decomposition. By the codoping of Pr, these negative effects were eliminated, leading to remarkable catalytic performance. Nitrous oxide (N 2 O) has gained increasing attention as a non-carbon dioxide greenhouse gas, and catalytic decomposition is an effective method for mitigating its emissions. In this study, Ce-Pr Co-doped Co 3 O 4 was synthesized via a coprecipitation method and used for the catalytic decomposition of N 2 O. The experimental results revealed that the N 2 O decomposition achieved 100% conversion at 400 °C on the catalyst with a Pr/Ce/Co molar ratio of 0.02:0.2:1, exhibiting an 80 °C decrease of T 100 compared with that of Co 3 O 4 . The introduction of Ce reduced the size and crystallization of Co 3 O 4 particles, increased the activity of the lattice oxygen of Co 3 O 4 , and facilitated the formation of oxygen vacancies, thereby enhancing the activation of N 2 O. However, the introduction of Ce inhibited the crystallization of Co 3 O 4 and the surface coverage of CeO 2 decreased the exposure degree of N 2 O molecules to the Co 3 O 4 surface. Co-doping strategy of Ce-Pr was performed to alleviate the negative effects of ceria. Consequently, the incorporation of Ce and Pr species enhanced the redox properties of Co 3 O 4 , leading to remarkable catalytic performance of N 2 O decomposition. This study elucidated the interaction between Ce and Pr dopants and Co 3 O 4 , and encouraged more attention on designing novel catalysts for N 2 O mitigation.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Liu Yan,Wei Jie,Yang Zhengwu,Zheng Lirong,Zhao Jiankang,Song Zhimin,Zhou Yuhan,Cheng Jiajie,Meng Junyang,Geng Zhigang,Zeng Jie
The nitrate (NO 3 − ) electroreduction into ammonia (NH 3 ) represents a promising approach for sustainable NH 3 synthesis. However, the variation of adsorption configurations renders great difficulties in the simultaneous optimization of binding energy for the intermediates. Though the extensively reported Cu-based electrocatalysts benefit NO 3 − adsorption, one of the key issues lies in the accumulation of nitrite (NO 2 − ) due to its weak adsorption, resulting in the rapid deactivation of catalysts and sluggish kinetics of subsequent hydrogenation steps. Here we report a tandem electrocatalyst by combining Cu single atoms catalysts with adjacent Co 3 O 4 nanosheets to boost the electroreduction of NO 3 − to NH 3 . The obtained tandem catalyst exhibits a yield rate for NH 3 of 114.0 mg \({}_{{{{{{\rm{NH}}}}}}_3}\) h −1 cm −2 , which exceeds the previous values for the reported Cu-based catalysts. Mechanism investigations unveil that the combination of Co 3 O 4 regulates the adsorption configuration of NO 2 − and strengthens the binding with NO 2 − , thus accelerating the electroreduction of NO 3 − to NH 3 .
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Taobo Huang,Rui An,Jie Li,Wen Liu,Xiuping Zhu,Haodong Ji,Ting Wang
Heterojunctions composed of cobalt-based materials and carbon materials have been recognized as the efficient catalysts for peroxymonosulfate (PMS) activation to generate reactive oxygen species for the removal of environmental contaminants . However, the role of carbon materials in promoting the heterojunction systems has not been fully understood. This study synthesized a heterojunction material of graphene sheets encapsulating Co 3 O 4 (GCO-500) through the pyrolysis of cobalt MOF and applied it to activate PMS for the removal of lomefloxacin . The results showed a high removal rate of 93.59 % with a degradation rate of k 1 = 0.0156 min −1 . Co 3 O 4 clusters was encapsulated within ultrathin graphene sheets (<2 nm). DFT calculations revealed that graphene layers improve the electron transfer ability of Co 3 O 4 and increased the d -band center of Co 3 O 4 (−1.61 eV) that promote the adsorption of PMS on GCO-500 (−1.32 eV). In the meanwhile, organic pollutant was enriched in graphene layers with high adsorption energy (−13.08 eV), which greatly enhanced the degradation efficiency of pharmaceuticals. This study provides an effective catalyst for PMS activation and sheds light on the fundamental electronic-level understanding of cobalt-based and carbon heterojunction catalysts in PMS activation.
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APPLIED THERMAL ENGINEERING
·
2024
·
IF 6.1
Lei Liu,Kexin Li,Hanzi Liu,Zhiqiang Sun
Thermal energy storage supports stable grid integration of variable renewable energy sources by reducing power curtailment and generation costs. Thermochemical energy storage (TCES) offers high energy density and long-duration, long-distance storage advantages, making it a focus in large-scale applications such as concentrated solar power plants. Metal oxide systems like Co 3 O 4 /CoO are widely used due to their operational flexibility, yet limited understanding of their decomposition kinetics hinders optimization of TCES materials and reactor design. In this study, we developed a rate equation based on density functional theory and transition state theory to identify the reaction mechanisms and rate constants at the gas–solid interface, prior to predict Co 3 O 4 decomposition kinetics. A microkinetic model was then constructed to couple surface reactions with oxygen ion diffusion across the bulk, which was integrated into a reactor model accounting for mass transfer steps. The model’s accuracy was validated against the data from the micro-fluidized bed thermogravimetric analyzer experiments. For particles smaller than 150 μm, the formation step of adsorbed O 2 (energy barrier of 0.8 eV) controls the reaction rate, while gas diffusion dominates the reaction rate for particles larger than 500 μm. To conclude, the optimal conditions for maximizing charge–discharge kinetics in TCES applications were identified as: 850–900 °C, 0–10 vol% O 2 , and 150–500 μm. This model provides theoretical guidance for optimizing TCES materials and reactor design, reducing experimental costs while maintaining accuracy.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
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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高影响因子
MOLECULES
·
2025
·Vol. 30
·期 10
·2237
·
IF 4.6
Bai Sun,Rui Liu,Fengshou Zhao,Shengnan He,Yun Wang,Xiangxiang Wang,Hao Huang,Mingjian Yi,Shuguang Zhu
To address the issues of poor Co2+regeneration and limited interfacial electron transfer in heterogeneous catalytic systems, this study proposes the synthesis of highly efficient and stable Co3O4/ZnO composites through the pyrolysis–oxidation reaction of Co/Zn MOFs for the degradation of rhodamine B (RhB) using activated peroxymonosulfate (PMS). The results confirmed that the catalyst exhibited a high electron transfer capacity, and the synergistic effect between the bimetals enhanced the reversible redox cycle of Co3+/Co2+. Under optimal conditions, complete removal of RhB was achieved in just 6 min using the Co3O4/ZnO composite, which demonstrated excellent stability after five cycles. Furthermore, the catalyst exhibited a high degradation efficiency in real water samples with a total organic carbon (TOC) removal rate of approximately 65% after 60 min. The electrochemical measurements, identification of active species, and X-ray photoelectron spectroscopy (XPS) analysis revealed that non-radicals (1O2and direct charge transfer) played a major role in the degradation of RhB. Finally, the potential mechanisms and degradation pathways for RhB degradation using this catalyst were systematically investigated. This study opens new avenues for the development of efficient and stable PMS catalysts, and provides insights into the preparation of other emerging metal oxides.
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HYDROMETALLURGY
·
2020
·
IF 3.338
Shiwei He,Ruidong Xu,Li Sun,Youqi Fan,Zhuo Zhao,Huan Liu,Huihong Lv
In this study, a new anode based on Pb-0.3%Ag/α-PbO 2 /β-PbO 2 -Co 3 O 4 composite is proposed and its performance is compared with that of the traditional Pb-1wt%Ag anode during long-term zinc electrowinning . The electrocatalytic activity of the new anode for the oxygen evolution reaction (OER) initially decreased and then gradually increased, which was attributed to the phase transition occurring at the surface of the anode, and its corrosion resistance was gradually improved with the progress of electrowinning. Further, the electrochemical characteristics, cell voltage , current efficiency , and energy consumption of the two anodes were evaluated after 16 days of electrowinning. The OER electrocatalytic activity and corrosion resistance of the new anode were observed to be higher than those of the traditional anode. In addition, the cell voltage and power consumption of the new anode were significantly lower than those of the traditional anode. Furthermore, compared to the traditional anode, the energy consumption for producing 1 t of zinc was reduced by 358.13 kWh based on the new anode.
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