MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 9
·1-15
·
IF 5.3
Guo Jieli,Li Jin,Xing Xiujing,Xiong Wei,Li Hao
As an ideal transition metal oxide, Co 3 O 4 is a P-type semiconductor with excellent electrical conductivity, non-toxicity and low cost. This work reports the successful construction of Co 3 O 4 materials derived from metal-organic frameworks (MOFs) using a surfactant micelle template-solvothermal method. The modified electrodes are investigated for their ability to electrochemically detect Pb 2+ and Cu 2+ in aqueous environments. By adjusting the mass ratios of alkaline modifiers, the morphological microstructures of Co 3 O 4 -X exhibit a transition from distinctive microspheres composed of fiber stacks to rods. The results indicate that Co 3 O 4 -1(NH 4 F/CO(NH 2 ) 2 = 1:0) has a distinctive microsphere structure composed of stacked fibers, unlike the other two materials. Co 3 O 4 -1/GCE is used as the active material of the modified electrode, it shows the largest peak response currents to Pb 2+ and Cu 2+ , and efficiently detects Pb 2+ and Cu 2+ in the aqueous environment individually and simultaneously. The linear response range of Co 3 O 4 -1/GCE for the simultaneous detection of Pb 2+ and Cu 2+ is 0.5–1.5 μM, with the limits of detection (LOD, S/N = 3) are 9.77 nM and 14.97 nM, respectively. The material exhibits a favorable electrochemical response, via a distinctive Co 3 O 4 -1 microsphere structure composed of stacked fibers. This structure enhances the number of active adsorption sites on the material, thereby facilitating the adsorption of heavy metal ions (HMIs). The presence of oxygen vacancies (O V ) can also facilitate the adsorption of ions. The Co 3 O 4 -1/GCE electrode also exhibits excellent anti-interference ability, stability, and repeatability. This is of great practical significance for detecting Pb 2+ and Cu 2+ in real water samples and provides a new approach for developing high-performance metal oxide electrochemical sensors derived from MOFs. Graphical abstract
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RARE METALS
·
2025
·
IF 11
Zhang Xu,Zhao Ke-Yu,Su Shuang,Zou Zhong-Li,Qian Yong-Qiang,Cheng Kui
With the rapid development of flexible equipment, high-energy/-power requirements have been proposed for energy storage devices. Nevertheless, the poor conductivities of metallic oxides and their low levels of transmission of electrons/ions hinder their widespread application. Here, a sandwich-structured Co 3 O 4 –Fe 3 O 4 (CFO) composite with binder-free was synthesized on a carbon cloth substrate via co-precipitation and partial ion exchange. The appropriate substitution of Co 3 O 4 with Fe 3 O 4 is favorable in promoting the rapid transfer of electrolyte ions and alleviating changes in volume during the electrochemical studies. When the duration of the substitution reaction is 20 min, the obtained electrode delivers a maximum specific capacitance of 1196.2 F g −1 at a current density of 1 A g −1 and a superior capacity retention of ~ 71% when the current density varies from 1 to 30 A g −1 . Furthermore, the fabricated CFO//activated carbon flexible all-solid-state supercapacitor exhibits a respective maximum energy and power density of 68.7 Wh kg −1 and 16,000 W kg −1 and excellent flexibility. It also displays a specific capacity retention of 81.3% under four continuous bending states at a current density of 6 A g −1 over 10,000 cycles. These remarkable electrochemical characteristics suggest that the sandwich-structured CFO composite displays considerable potential for application in flexible high-energy/-power supercapacitors. Graphical abstract
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Molecular Catalysis
·
2024
·
IF 3.9
Xintong Li,Min Gao,Shenglong Li,Zhichuan Yang,Xin Zhao,Yu Liu
The combination of quantum dots (QDs) with carbon materials has garnered significant attention as electrocatalysts owing to their exceptional catalytic activity and robust thermodynamic stabilities. The present study utilizes bio-based mesoporous carbon as a carbon source to synthesize QDs carbon nanostructures (Co 3 O 4 /BMC -400 ) through hydrothermal and carbonization methods. Due to the abundance of active sites and limited availability of Co, the size of Co particles is confined to the QDs level, ranging from 2 to 3 nm. The anodic oxidation reaction of the Co 3 O 4 /BMC -400 was investigated in freshwater, seawater, and urea. The prepared Co 3 O 4 /BMC -400 exhibits an oxygen evolution reaction overpotential of 235 mV at 10 mA cm −2 in 1.0 M KOH. The catalytic activity is reduced as a result of the competitive oxidation and corrosion caused by chloride ions in seawater. For the urea oxidation reaction, Co 3 O 4 /BMC -400 exhibits superior catalytic performance, requiring only a potential of 1.371 V at 10 mA cm −2 , while exhibiting remarkable long-term stability for up to 30 h. More significantly, in comparison to Co 3 O 4 nanosheets and nanoparticles, QDs can effectively reduce the transport pathways of alkali metal ions, thereby affording an increased number of catalytic active sites while simultaneously enhancing stability and prolonging service life. These findings may facilitate further exploration of metal-QDs/carbon materials in a wide range of electrocatalytic application.
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Small
·
2024
·
IF 13
Ming Li,Haixin Sun,Chen Wang,Yongzhuang Liu,Qinqin Xia,Juan Meng,Haipeng Yu,Shuo Dou
The electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) represents an environmentally friendly approach to generate high-value-added chemicals from biomass. The successful electrochemical transformation of HMF during the oxidation reaction (HMFOR) necessitates an ideal adsorption interaction between HMF and OH − on the electrode surface. Yet, catalysts with a singular active site offer limited flexibility in managing the competitive adsorption of HMF and OH − . To this end, different active sites are customized in this work to construct a P and N co-doped porous carbon that wrapped Co 3 O 4 (Co 3 O 4 @PNC). Co-doping with these two heteroatoms generates C 3 P = O and pyrrolic N as adsorption sites to better balance the adsorption of HMF and OH − , respectively, rather than promoting competition between the HMF and OH − on a single active site. With this design strategy, Co 3 O 4 @PNC demonstrates significant HMFOR activity, the conversion rate of HMF surpassed 99% with a 2,5-furandicarboxylic acid (FDCA) yield exceeding 95% after 2 h of electrolysis. Furthermore, it shows universal applicability in the electrooxidation of other alcohol/aldehyde substrates, yielding efficiencies of 90–99%. This work not only provides guidance for advanced electrocatalysts design toward alcohol/aldehyde oxidation but also offers insights into the utilization of biomass-derived platform chemicals.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 48
·20296-20303
·
IF 2.7
Wenting Tong,Zhichao Ma,Shulin Zhang,Apei Jiang,Ming Wei,Jianhua Jia,Wenbo Lu
The quantitative detection of food additives containing sunset yellow is of great significance to food safety. In this study, a simple, low-cost, and sustainable pencil graphite electrode modified with Co3O4@biochar is proposed for the accurate detection of sunset yellow in beverages. Absorbent cotton is selected as the biological carbon source, which is immersed in cobalt salt and then pyrolyzed in air to achieve the preparation of nanocomposite Co3O4@biochar (Co3O4@BC-700). The successful synthesis of Co3O4@BC-700 is confirmed by XRD, SEM, TEM, XPS and BET. It is gratifying that the Co3O4@BC-700 modified pencil graphite electrode enables the electrochemical quantitative detection of sunset yellow with a linear range of 5.0 × 10−6–4.0 × 10−3 M, a detection limit as low as 1.3 × 10−6 M, and a cost as low as 0.5 Yuan per electrode. It also has excellent selectivity, stability and repeatability. This electrochemical sensor based on Co3O4@biochar can be employed for the concentration detection of sunset yellow in beverages. This work attempts to provide a novel path for the electrochemical detection of food additives.
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Journal of Energy Storage
·
2025
·
IF 9.8
Xindou Yu,Jin Zhang,Xiaomin Zhang,Kedi Cai
The potassium‑oxygen battery (KOB) as the only new system in metal-air batteries does not generate singlet oxygen ( 1 O 2 ). It is a novel high-energy-density storage device which has attracted widespread attention. However, the low efficiency of potassium ion and oxygen transfer in KOB, along with slow kinetics, results in poor cycling stability. For this reason, a new composite catalytic material with a multicomponent Mo@VN/V 2 O 3 -Co 3 O 4 in cathode of KOB has been designed and prepared. The homologous heterostructure formed between VN and V 2 O 3 exhibits a good lattice match, enhancing the carrier mobility and electrochemical activity of the electrode, thereby increasing the discharge capacity of the KOB. The multicomponent active interface formed between Co 3 O 4 and VN/V 2 O 3 stimulates more electrons to participate in redox reactions, and the synergistic catalytic effect promotes the reversible decomposition of KO 2 , improving the cycle life of the KOB. The doping of Mo enables Mo 6+ to enter the V 2 O 3 lattice, replacing some V δ+ , which creates crystal defects that facilitate the rapid diffusion of K + and O 2 in the electrode. Final, the Mo@VN/V 2 O 3 -Co 3 O 4 is used as a cathode catalyst of KOB, shown discharge specific capacity of 1899.61 mAh·g −1 with a cycle life >170 cycles.
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ChemistrySelect
·
2024
·Vol. 9
·期 23
·e202302680
·
IF 1.9
Pengpeng Li,Lei Su,Juan Chen,Shuo Li,Fu Su
Graphical Co 3 O 4 /Bi 2 MoO 6 p-n type heterojunctions were successfully prepared by hydrothermal combined in-situ deposition. The degradation rate of enrofloxacin reached 87.84 % in 30 min under visible light irradiation with PMS (monoperoxysulfate). Thanks to the construction of the p-n heterojunction system and the activation of the PMS, the photogenerated charge carriers of the Co 3 O 4 /Bi 2 MoO 6 composite can be completely separated and transferred to produce active species with higher oxidation properties. On this basis, the photocatalytic mechanism of Co 3 O 4 /Bi 2 MoO 6 /PMS was explored. In this work, Co 3 O 4 /Bi 2 MoO 6 p-n-type heterojunctions were successfully fabricated via a hydrothermal method combined with in-situ deposition. The as-prepared samples were systematically characterized by means of SEM, TEM, XPS, XRD, etc. Through the synergistic effect of PMS (peroxosulfate monosalt), the obtained composite CB-2 has a superior degradation performance of enrofloxacin under visible light irradiation, and the degradation rate of enrofloxacin reaches 87.84 % within 30 min. The reaction process of enrofloxacin degradation was analyzed by 3D EEM (exception emission matrix spectrum) and LC–MS (liquid phase mass spectrometry). The influence of the reaction system on EFA degradation efficiency without PMS synergy and light was studied. The kind of free radical was determined from the outcome of the EPR and free radical capture experiment. Benefiting from the construction of the p-n heterojunction system and the activation of the PMS, the photogenerated carriers of the Co 3 O 4 /Bi 2 MoO 6 composite can be fully separated and transferred to produce active species with higher oxidative properties. Based on this, the photocatalytic mechanism of Co3O4/Bi2MoO6/PMS was explored.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shuangshuang Li,Jie Liu,Yunmei Du,Mengmeng Wang,Yuanxiang Gu,Dehong Chen,Ruiyong Zhang,Lei Wang
The difficulty of nitride modification is to develop simple and efficient strategies to induce defects and efficiently capture Ru atoms. With these in mind, this work innovatively constructed a Ru-Co 3 O 4 /CoN-L catalyst with abundant anion defects (oxygen vacancies (V O ) and nitrogen vacancies (V N )) using the nitridation-quenching-Ru doping strategy. Surprisingly, the porous structure provided more active sites, and the V N and V O were conducive to promoting the anchoring of Ru atoms. These significantly improved the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performances of the Ru-Co 3 O 4 /CoN/NF-L catalyst. The density functional theory results showed that the anion defects optimized the hydrogen adsorption capacity of the Ru active sites for the HER. Furthermore, Ru dopants and anion defects reduced the OER energy barrier of the Co-active sites, accelerating the HER and OER kinetics. This study proposes a new concept for defect construction and nitride-structure optimization.
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Scientific Reports
·
2025
·Vol. 15
·期 1
·1-13
·
IF 3.9
Ding Xiaojun,Liu Dingbang,Wang Zihao,Peng Yilin,Fu Shuqi,Zhan Na,Jiang Qing,Li Mingyang,Wan Haiyang,Liu Jiansheng,Zhao Xinsheng,Gao Fei,Zhou Weiping,Cheng Zhenzhi,Wu Zhongkai,Luo Guangsheng
Transition metal oxides (TMOs), especially spinel-type iron oxides, are widely used as electrode materials for supercapacitors due to their high specific capacitance. However, as a kind of pseudocapacitive electrode material, transition metal oxide undergoes volume changes during the charge–discharge process, leading to a decrease in its cycling stability. Carbon nanotubes (CNTs), as a common carbon-based material, exhibit excellent cycling stability. In this study, we have successfully synthetized CoFe 2 O 4 @Co 3 O 4 /CNT by utilizing zeolitic imidazolate framework (ZIF) as a template. The resultant material exhibits a porous network architecture and the synthesized material was subsequently utilized as an electrode in supercapacitor applications, exhibiting a remarkable specific capacitance of 641 C g −1 at 1 A g −1 . The stability of the electrode were evidenced by its ability to retain 62.3% of its initial capacitance after 5000 cycles at the high current density of 10 A g −1 , indicating its potential for long-term energy storage applications.
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CHINESE JOURNAL OF CHEMISTRY
·
2025
·
IF 5.5
Xiao Liu,Xiang Yuan,Zhike Si,Haixia Liao,Lihong Wu,Yongzhu Yan,Yongxin Qian,Gengping Wan,Guizhen Wang
Comprehensive Summary Combining magnetic materials with high dielectric MXene has been proven to be an effective method to construct superb electromagnetic protective materials as they can introduce interface polarization and collaborate dielectric-magnetic loss mechanism. However, the application of such hybrid structure is constrained by the obvious instability of MXene at acidic, basic, and high-temperature environments. Herein, inspired by the great advantage of unique “hard shell and soft core” protective structure of natural coconuts, polydopamine (PDA)@Co 3 O 4 /Ti 3 C 2 T x (M)/polytetrafluoroethylene (PTFE) composite was fabricated for durable electromagnetic protective application. In this structure, the antioxidant PDA and chemically inert PTFE serve as a robust protective layer analogous to a “coconut shell”, effectively encapsulating the Co 3 O 4 /Ti 3 C 2 T x core, which functions as the primary additive for electromagnetic wave attenuation. The PDA@Co 3 O 4 /M/PTFE composite demonstrates a reflection loss (RL) value of −59.12 dB and an effective absorption bandwidth (EAB) of 6.72 GHz. It also exhibits electromagnetic shielding effectiveness of up to 27.67 dB and an absorption efficiency of 94.12%. Furthermore, the composite shows excellent environmental stability under acidic, basic, and sunlight exposure conditions, along with outstanding hydrophobic and flame-retardant properties. In conclusion, the PDA@Co 3 O 4 /M/PTFE has significant potential to satisfy electromagnetic protective need of electronic systems, aerospace, and defense industries under harsh conditions.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Huangtong Chen,Yifei Yang,Xiaofei Li,Huimei Duan
Defect engineering in oxide supports has emerged as a promising approach to enhance the surface chemical properties of active metals for methane catalytic oxidation. Herein, the N-doped Pd/Co 3 O 4 (Pd/N-Co 3 O 4 ) catalysts were successfully synthesized using ZIF-67 as a self-sacrificial template via an H 2 O-soaking treatment. Compared to conventional Pd/Co 3 O 4 catalysts (T 50 : 294 °C), the Pd/N-Co 3 O 4 catalysts exhibited superior catalytic activity (T 50 : 278 °C) and exceptional water resistance, with only a 6% activity loss at 350 °C in the presence of 5 vol% H 2 O, as opposed to a 56% loss for Pd/Co 3 O 4 catalysts. Detailed experimental characterizations revealed that N-doping significantly increased oxygen vacancy concentrations and surface lattice oxygen mobility while stabilizing Pd/PdO x active sites through the electronic metal-support interaction (EMSI) between Pd and N-Co 3 O 4 . In the Pd/N-Co 3 O 4 catalysts, the enhanced oxygen vacancies rendered the N-Co 3 O 4 support electron-rich, which in turn diminishes the electron transfer from Pd to N-Co 3 O 4 supports. This modulation effectively inhibited the excessive oxidation of Pd/PdO x active species into bulk PdO, thereby enhancing catalytic performance and water tolerance in methane oxidation. These findings provide valuable insights into the role of N-doped defect engineering in facilitating efficient methane catalytic combustion, highlighting the significance of EMSI and oxygen vacancies in optimizing catalyst performance.
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RSC Advances
·
2025
·Vol. 15
·期 37
·30817-30828
·
IF 4.6
Hui Fui,Xinran Ma,Yiping Huang,Shiyao Xi,Zhandong Ren,Yuchan Zhu
AS a low-cost and high-performance catalyst, spinel cobalt oxide (Co3O4) has two different catalytic active sites (tetrahedral Co2+ and octahedral Co3+) to drive the activation of peroxymonosulfate (PMS) through Co2+/Co3+ redox cycle. Tuning Co2+/Co3+ atomic ratio on the surface of Co3O4 for the construction of a synergy in the Co2+/Co3+ redox cycle might be an effective way to further boost PMS activation performance of Co3O4 catalyst. Herein, we suggested a metal-doping strategy to regulate Co2+/Co3+ atomic ratio of Co3O4 by partially substituting Co2+ with inert Mg2+ and formed a series of Mg doped Co3O4 (MCO) catalysts. Structural characterizations and experimental investigations demonstrated that Mg doping did not change Co3O4 host lattice and particle morphology, but could manipulate surface Co2+/Co3+ atomic ratio of Co3O4 for an improved PMS activation. The optimal MCO catalysts (MCO-0.2) with the suitable Co2+/Co3+ atomic ratios (1.13) exhibited the excellent thiacloprid (THIA) degradation performance through PMS activation, and the apparent degradation rate constant (0.2835 min−1) was highly outperformed that of pure Co3O4 (0.09555 min−1) and other similar cobalt-based catalysts. The optimal THIA degradation conditions might be: catalyst dose 100 mg L−1, PMS concentration 0.8 mM, pH 7 and THIA concentration 20 mg L−1. Quenching experiments and electron paramagnetic resonance (EPR) characterizations suggested SO4˙−, HO˙ and 1O2 were all involved in THIA degradation during the MCO-0.2/PMS process. Furthermore, the steady-state concentrations of these reactive species and their relative contributions to THIA degradation were also calculated by combining a kinetic model and a series of probe compound-based experiments. The results indicated that SO4˙− and HO˙ were generated at lower steady-state concentrations than that of 1O2, but they dominated THIA abatement during the MCO-0.2/PMS process. This study presented new insights into the construction of efficient PMS activator and a mechanistic understanding for PMS-mediated reaction.
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