Science China-Technological Sciences
·
2024
·Vol. 67
·期 10
·3103-3115
·
IF 4.4
Yin ShiMei,Gao YiXuan,Chen Long,Li Fan,Liu XiaoNa,Qi Fei,Liu Wen
This study innovated cobalt-based catalytic nanocomposites (CCNs) for the heterogeneous activation of peracetic acid (PAA), a green and efficient advanced oxidation process for removing antibiotics from water. Commercial Co 3 O 4 catalysts exhibit limited activity due to stable electronic structures. To overcome this, CCNs were synthesized using a one-step condensation method, incorporating a size control strategy that anchors Co 3 O 4 nanoclusters within 4–5 nm onto six-fold cavity of g-C 3 N 4 , simultaneously modifying the coordination environment of Co. This alteration significantly enhances the adsorption energy of PAA and catalytic activity compared to commercial Co 3 O 4 . The improved performance of CCN2, in particular, is attributed to a shift in the cobalt d band center towards the Fermi level, facilitating electron delocalization and transfer, enhancing Co–O bonding, and accelerating PAA decomposition. CCN2’s superior activity, with a cefapirin (CFP) degradation kinetic rate constant ( k 1 = 0.760 min −1 ) ~11 times that of PAA direct oxidation ( k 1 = 0.070 min −1 ) and ~5 times that of commercial Co 3 O 4 /PAA system ( k 1 = 0.164 min −1 ), is due to its ability to generate dominant reactive species for antibiotic degradation, including alkoxy radicals (CH 3 C(=O)OO•), high valence metal (Co IV (=O) 2+ ), and singlet oxygen ( 1 O 2 ), with the latter two being crucial for the degradation process. The degradation of CFP involved three mechanisms, including direct oxidation by PAA, decarboxylation, and open-ring reactions at nitrogen sites. This research provides insights into developing high-activity catalysts for efficient PAA activation and antibiotic removal, leveraging the strategy of shifting the transition metal d band center.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Xinzhi Wang,Jie Hu,Wangwang Guan
In this work, a self-template in situ etching strategy was applied to fabricate a hollow shuttle-like WO 3 -Co 3 O 4 heterojunction. The morphology and nanostructure were investigated comprehensively by a series of techniques. Notably, the hollow shuttle-like WO 3 -Co 3 O 4 shows a large specific area and promising architecture, which can efficiently promote the gas adsorption-desorption process and provide more active sites in whole composites. Compared to other sensing devices, the WO 3 -Co 3 O 4 sample with hollow shuttle-like architecture shows the best gas sensing characterizations, and the response to 100 ppm acetone is as high as 52 under optimum working temperature. Moreover, it also presents good repeatability, high against moisture, fast response-recovery speed and long-term stability. The enhanced gas sensing characterizations can be ascribed to the synergistic effect of a unique hollow shuttle-like structure and the p-n heterojunction at the interface of WO 3 and Co 3 O 4 . These admirable properties make it an excellent candidate for constructing high-performance acetone sensors. In addition, the relative sensing mechanism of shuttle-like WO 3 -Co 3 O 4 composites-based sensors will be discussed in detail.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yuqing Li,Suhang Meng,Chunhe Cao,Yi Li
The electronic structure of metal oxides plays an important role in determining their catalytic activity, but how to regulate this structure to overcome inherent limitations in electron transfer efficiency and spin state configuration remains a significant challenge. Herein, we designed a Ni-doped Co 3 O 4 nanorod, where Ni occupied at the octahedral site can effectively facilitate the spin-state transition of Co 3+ from a low-spin to a high-spin state, inducing an electronic structure reconstruction in Co 3 O 4 . This not only increases the e g filling of Co 3+ but also generates additional electronic states, benefiting water purification process. As expected, the obtained Ni-Co 3 O 4 -4 catalyst exhibits excellent catalytic performance in electro-Fenton like (EF-like) system, achieving a ciprofloxacin (CIP) removal efficiency of 94.3%, with a rate constant ( k ) 1.69 times higher than that of Co 3 O 4 . In situ Raman spectra confirmed that the charge rearrangement between Ni and Co 3 O 4 facilitated the formation of the key *OOH intermediate, promoting the production of superoxide radicals (·O 2 - ). Additionally, the developed Ni-Co 3 O 4 -4 system can operate continuously for 600 min in a continuous-flow reactor. This work deepens the comprehensive understanding of the relationship between electrocatalytic activity and the spin configuration of Co ions, offering an effective design strategy for spinel compound catalysts aimed at environmental remediation.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Shiyao Wang,Pengfei Zhang,Xi Zhang,Detao Xia,Peng Zhao,Jie Meng,Nengjie Feng,Hui Wan,Guofeng Guan
It is important to design and develop catalysts with good water resistance to cope with the toxicity of water vapor on catalyst activity. In this study, we proposed a simple method to improve the water resistance of catalysts for toluene catalytic combustion by preparing a series of Co-Ce composite oxide catalysts via a citrate sol–gel method. Experimental results showed that Co 6 Ce 1 O x exhibited the best catalytic activity (T 50 = 236 ℃; T 90 = 251 ℃) and water resistance among all the catalysts. The crystal structure and surface chemistry of the catalysts were analyzed using a series of correlation characterizations, and the adsorption energies of toluene and water on the catalysts were calculated using density functional theory (DFT). The results showed that the doping of Ce in Co 3 O 4 had not only effectively changed the oxygen distribution state of Co 3 O 4 and increased its oxygen vacancy content, thus greatly enhancing the oxidizing ability of the catalyst, but also suppressed the adsorption of H 2 O on the surface of the catalyst, and significantly enhanced the water resistance of the catalyst. The present work provided a new idea and method for developing efficient and excellent water resistant catalysts for the catalytic oxidation of toluene.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiaxuan Yang,Wenqian Li,Jialong Chen,Nuo Cheng,Tianyi Wang,Hesong Wang,Daliang Xu,Han Zhang,Jinlong Wang,Langming Bai,Heng Liang
Wastewater increases and water shortage crises have forced the rapid innovation of water reuse technologies. Ceramic membrane process (CM), as one of the key technologies for wastewater reclamation, can effectively light the current difficulties. However, membrane fouling and low retention rate are critical bottles that hinder its further application. Herein, we proposed yolk-shell Co 3 O 4 spheres modified CM (CoHM-CM) activating peroxymonosulfate (PMS) to improve membrane filtration performance. The results showed that the synergistic effect of size exclusion of CM and spatial confinement of CoHM enhanced the collision between organic pollutants and active sites. CoHM-CM/PMS (30 mg CoHM loading combined with 0.5 mM PMS dosage) degraded 100 % of 10 mg/L phenol, bisphenol F and sulfamethoxazole, and 91.29 % of 5 mg/L carbamazepine at an instant of membrane filtration. This process efficiently removed secondary effluent organic matter and reduced membrane fouling resistance by more than 70 % in actual wastewater environments. Besides, the yolk-shell catalytic membrane had strong Co 2+ regeneration capacity and chemical stability. It coupled PMS-generated sulfate radicals and singlet oxygen play a core role in increasing the membrane interface energy barrier and releasing the developing tendency of membrane pore blocking to severe cake layer filtration fouling. The results provided a new opportunity for wastewater remediation based on the yolk-shell modified membrane technology.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Zaiwei Lu,Yong Men,Wang Liu,Shuyi Xu,Jinguo Wang,Zhenrong Yan,Xuelong Miao,Tamerlan T. Magkoev
Nickel foam (NF) has been recognized to have great application potential in catalysis. In this study, cobalt oxide (Co 3 O 4 ) nanoarrays were synthesized on NF using a hydrothermal method and applied for carbon oxide-free (CO X -free) production via ammonia (NH 3 ) decomposition at atmospheric pressure. The application of varying hydrothermal temperatures from 80 °C to 180 °C enabled the synthesis of Co 3 O 4 nanostructured arrays with diverse morphologies, presenting a novel approach to catalyst design. Among the synthesized catalysts, the optimal Co/NF-120-8 nanoarray catalyst synthesized with the hydrothermal temperature of 120 °C achieved 100 % NH 3 conversion under a WHSV of 12,858 ml g cat −1 h −1 at 625 °C and maintained its activity for 45 h without noticeable degradation. SEM, TEM and XRD characterization results demonstrated that the hydrothermal temperature significantly influenced the morphologies, crystallite size and microstructure of the prepared catalysts, thereby affecting their catalytic performance for NH 3 decomposition. XPS and H 2 -TPR measurements further indicated that the most abundant metallic Co and lattice oxygen were the key factors for the superior performance of NH 3 decomposition over Co/NF-120-8 catalyst. Such a monolithic nanoarray catalyst proposed herein may open a new window in the efficient hydrogen production via NH 3 decomposition and may also serve as a promising material in other heterogeneous reactions.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Jing Wang,Wei Liu,Xinyi He,Yingjie Li,Fukai Chu,Yanbei Hou,Weizhao Hu,Lei Song,Yuan Hu
Conventional intumescent flame retardants typically generate localized hypoxic environments within the char layer, leading to incomplete carbonization and substantial CO emission, particularly in intrinsically flammable polyolefins. Metal oxides, owing to their high catalytic activity and tunable redox states, have emerged as promising additives for smoke suppression and toxicity mitigation in polyolefin systems. However, excessive catalytic activity can concurrently accelerate oxidative decomposition of the protective char. Inspired by the protective architecture and stimuli-responsive release of natural seeds, we report a bioinspired interfacial chemical engineering strategy to construct a core–shell Co 3 O 4 @ZIF-8 catalyst. This confinement architecture enables spatiotemporal decoupling of char formation and CO oxidation. During early combustion, the catalyst facilitates the rapid formation of a compact char barrier serving as an efficient thermal shield. Upon reaching elevated temperatures, Co 3 O 4 becomes exposed via the ZIF-8 carrier, efficiently catalyzing CO oxidation and markedly reducing toxic emissions. This strategy achieves a 91.7% reduction in the peak heat release rate (PHRR), 83.9% decrease in total heat release (THR), and 54.1% reduction in CO emission, while delivering outstanding flame-retardant performance (LOI=32%, UL-94 V-0 rating). Collectively, this work establishes a bioinspired core–shell confined catalyst for simultaneous fire safety and toxicity suppression in flame-retardant polypropylene.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 36
·29925-29936
·
IF 4.6
Zhenwei Yan,Zihao Wei,Zhaojun Tan,Shuaihui Guo,Zhipeng Fang,Wen Wang,Gang Li,Xianjie Yuan,Mingqi Tang,Zaiqiang Feng
The oxygen evolution reaction (OER) is hindered by the sluggish kinetics, high costs, and poor stability of noble metal catalysts (e.g., RuO2), as well as low atomic utilization and limited accessibility of active sites in transition metal oxide catalysts. To address these challenges, this study develops a core–shell structured WO3@Co-CoPBA heterostructure as an efficient OER electrocatalyst. Co-CoPBA nanocubes are hydrothermally synthesized and then loaded with WO3 nanorods, followed by gradient annealing under N2 atmosphere (optimized at 500 °C) to form a Co3O4@WO3 heterojunction. Characterization and electrochemical evaluations reveal that annealing at 500 °C induces topological reconstruction of Co-CoPBA into porous Co3O4 and graphene cores, Co sites in Co3O4 serve as the catalytic active centers, forming a strong electronic coupling interface with the WO3 shell. This architecture significantly enhances the density of active sites (electrochemically active surface area of 3.8 cm2) and charge transfer efficiency (Tafel slope of 55.12 mV dec−1). The catalyst delivers an overpotential of 315 mV at 100 mA cm−2 in 1 M KOH, outperforming commercial benchmark catalyst RuO2 (372 mV). It exhibits exceptional stability with almost no performance decay after 100 h. Density functional theory (DFT) calculations demonstrate that interfacial electronic restructuring modulates the d-band center, optimizing the adsorption Gibbs free energy of OOH* intermediates and thereby improving intrinsic catalytic activity. This work provides an effective interface engineering strategy for designing high-performance, low-cost transition metal-based electrocatalysts.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy & Environmental Materials
·
2025
·
IF 14.1
Jia Wang,De Wang,Zhenyu He,Mengyu Yan,Yinyu Xiang,Huipeng Li,Lina Xu,Junsheng Li
Ruthenium-based catalysts are promising alternatives to platinum for the hydrogen evolution reaction (HER) due to their comparable activity and lower cost. However, their widespread application in alkaline water electrolysis is limited by insufficient stability and excessive hydrogen binding. Herein, the Ru@Co 3 O 4 nanosheets (Ru@Co 3 O 4 NSs) featuring dominant exposure of the Co 3 O 4 (111) facets and precise anchoring of Ru nanoclusters onto these planes were constructed. The interaction between Ru nanoclusters and the Co 3 O 4 (111) facets induces a downshift of the Ru d -band center, optimizes the interfacial water network, and simultaneously prevents the leaching of Ru species. Ru@Co 3 O 4 NSs deliver exceptional alkaline HER performance, with an overpotential of 9.8 mV at 10 mA cm −2 and robust durability over 1000 h at 1 A cm −2 . The catalyst also achieves a price-normalized activity of 145.9 A $ −1 , nearly nine times that of commercial Pt/C. When applied in an anion exchange membrane water electrolyzer (AEMWE), Ru@Co 3 O 4 NSs reveal a low cell voltage of 1.93 V at 1 A cm −2 and operate stably for 60 h with a minimal degradation rate of 0.67 mV h −1 . This work provides a promising approach for designing low-cost, high-performance Ru-based catalysts for sustainable hydrogen production.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Dong Wang,Siping Ding,Zhenzhen He,Tonghui Zhang,Xuefen Wang
In this work, a novel Co 3 O 4 @CeO 2 nanofibrous membrane was prepared by the combination of interfacial defect engineering strategy and coaxial electrospinning for unusual levofloxacin degradation. Implanting active Co 3 O 4 into CeO 2 derived from Ce-UiO-66 created more oxygen vacancies and improved the interfacial interaction (electron transfer and specific surface area). In addition, accelerated redox recycling occurred on the catalyst surface because of the cooperation of Co sites and Ce sites. As a result, the optimal Co 3 O 4 @CeO 2 nanocomposite showed an unexpectedly improved degradation efficiency of levofloxacin with a rate constant higher than 6.9 times (CeO 2 ) and 2.6 times (Co 3 O 4 ), superior elimination (>98%) of antibiotic (norfloxacin, tetracycline and doxycycline hydrochloride) and dyes (methylene blue, rhodamine b, methyl orange and crystal violet). Moreover, C-type hollow structure nanofibers with increased reaction area were prepared by coaxial electrospinning to support nanoparticles for consecutive wastewater treatment. The prepared nanofibrous membrane with loading 50 wt% Co 3 O 4 @CeO 2 (PC50 NFMs) exhibited loose structure, resulting in 168.2 ± 12 L m −2 h −1 of permeability driven by gravity, while 164.2 L m −2 of levofloxacin was efficiently treated. Besides, the PC50 NFMs had satisfactory reusability and stability in real water bodies. This work paved a new avenue to control water pollution through the design of membranous catalysts.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Shuang Wei,Kexin Li,Sheng Zhong,Ruirui Zhang,Guosheng Wang,Ruixia Liu
Selective conversion of inert C–H bonds in alkanes into high-value-added functional groups (alcohols, ketones, carboxylic acids, etc.) plays a vital role in establishing a green and sustainable chemical industry. Catalytic selective oxidation of cyclohexane to KA oil (cyclohexanol and cyclohexanone) is a typical representative of alkane functionalization. In this work, hollow cage-like Co3O4 (Co3O4-C) and particle Co3O4 (Co3O4-P) were synthesized by calcining two types of Prussian blue analogues (PBAs), which were used to catalyze the selective oxidation of cyclohexane. The Co3O4-C predominantly exposed (311) crystal plane is easier to adsorb cyclohexane than Co3O4-P, which is beneficial to shorten the induction period, accelerate the reaction rate, and improve the conversion. Consequently, Co3O4-C displayed a 10% conversion of cyclohexane within 1 h, and the KA oil selectivity reached 90%. The Co3O4-P exposed (220) crystal plane has a higher molar percentage of oxygen vacancies and more active oxygen species, as well as a strong cyclohexanone adsorption capacity, which is conducive to the deep oxidation of cyclohexanone to adipic acid and other diacid products. The mechanism analysis of cyclohexane oxidation catalyzed by PBA-based Co3O4 shows that it exemplifies the feasibility to tailor the surface of catalysts by modulating the PBAs, which ultimately influences their reaction performance for accelerating the reaction and maintaining high cyclohexane conversion and KA oil selectivity.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2025
·Vol. 15
·期 9
·854
·
IF 4
Han Cui,Qiwei Zhang,Shan Qiu
By modulating the mass ratio of hydrothermal agents to cobalt/iron precursors, Co3O4nanowires were successfully integrated into spinel-type Co/Fe@NF, forming a heterojunction anode for alkaline water electrolysis (AWE) hydrogen production. This Co3O4nanowire-assembled CoFe2O4nanosheet anode (Co/Fe(5:1)@NF) exhibits exceptional electrochemical oxygen evolution reaction (OER) performance, requiring only 221 mV overpotential to achieve 10 mA cm−2. Sulfamethoxazole (SMX) was employed as a model pollutant to investigate the anode sacrificial material; it achieved approximately 95% SMX degradation efficiency, reducing the OER potential of 50 mV/10 mA cm−2. SMX oxidation coupled with Co/Fe heterojunction structure partially substitutes the OER. Co/Fe heterojunction generates an internal magnetic field, which induces the formation of novel active species within the system. ·O2−is the newly formed active oxygen species, which enhanced the proportion of indirect SMX oxidation. Quantitative analysis reveals that superoxide radical-mediated indirect oxidation of SMX accounts for approximately 38.5%, Fe(VI) for 9.4%, other active species for 6.1%, and direct oxidation for 46.0%. The nanowire–nanosheet assembly stabilizes a high-spin configuration on the catalyst surface, redirecting oxygen intermediate pathways toward triplet oxygen (3O2) generation. Subsequent electron transfer from nanowire tips facilitates rapid3O2reduction, forming superoxide radicals (·O2−). This study effectively driven by indirect oxidation, with cathodic hydrogen production, providing a novel strategy for utilizing renewable electricity and reducing OER while offering insights into the design of Co/Fe-based catalyst.
✓ 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）