Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Shenhao Yuan,Xushuai Lv,Yiwei Zhang,Yangjin Wu,Chunfeng Mao,Yuming Zhou,Wenxia Chen,Yanyun Wang
A core-shell structure Au-based catalysts mSiO 2 /Au/Co 3 O 4 HS were successfully derived from in-situ growth ZIF-67 hollow spheres, which were synthesized by a one-step soft template method. The samples were characterized by SEM, TEM, EDX, XPS, XRD and BET to confirm its successful preparation and structural features. The catalytic performance of the catalysts were evaluated by liquid phase oxidation of benzyl alcohol to benzaldehyde with O 2 as the oxidant under alkaline conditions. The experimental results illustrated that reaction conditions, including effect of catalyst amount, oxygen flow rate, reaction temperature and reaction time, were optimized to be 40 mg, 50 ml/min, 140 °C and 5 h, respectively. Meanwhile, 55% conversion of benzyl alcohol and 84% selectivitiy to benzaldehyde together with the excellent reusability and stability were achieved under optimal reaction conditions, which was attributed to the core-shell structure leading to the encapsulation of Au NPs and provision of multiple active reaction interface. Based on the intermediates formed from the de-protonation of substrate, a plausible oxidation reaction mechanism with mSiO 2 /Au/Co 3 O 4 HS catalysts was tentatively proposed to study the relationship between structure and catalytic performance.
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Tao Dong,Guangze Sun,Wanjian Liu,Yunze Long,Aihua Liu
Acute respiratory infections (ARIs) are among the leading causes of morbidity and mortality worldwide, with Mycoplasma pneumoniae (M. pneumoniae) and Chlamydia pneumoniae (C. pneumoniae) being major pathogens responsible for community-acquired respiratory infections. Rapid and accurate diagnosis is critical for improving patient outcomes and effectively controlling disease transmission. Herein, we report a novel dual-channel lateral flow immunoassay (DC-LFIA) platform based on the Co3O4@polydopamine (PDA) nanocomposite with outstanding extinction coefficient, oxidase-like activity, and magnetic properties for the simultaneous detection of specific IgM antibodies (Ab) against these two pathogens in human serum. The magnetic properties of the Co3O4@PDA nanocomposite enable rapid enrichment of trace target Abs from large-volume serum samples, with a high extinction coefficient for direct colorimetric visualization and an excellent oxidase-like catalytic activity for signal enhancement. On the basis of the multifunctional Co3O4@PDA nanocomposite, rapid dual-mode detection of serum Abs was achieved within 12 min. By the direct colorimetric mode, the visual limit of detection (vLOD) for M. pneumoniae Ab and C. pneumoniae Ab reached 2 and 1 ng/mL, respectively, while the oxidase-like catalyzing signal amplification mode further lowered the vLODs to 0.2 and 0.1 ng/mL, accordingly. Additionally, the signal normalization using a 3D-printed device significantly enhanced assay accuracy and reproducibility. When applied to 96 clinical serum samples, compared to commercial kits, this multifunctional Co3O4@PDA-based DC-LFIA demonstrated superior performance, providing a reliable approach for simultaneous antibody detection in respiratory infection diagnosis. Overall, this work contributes a valuable diagnostic tool to the field of rapid detection of ARIs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Gui-lin Zhuang,Yi-fen Gao,Xiang Zhou,Xin-yong Tao,Jian-min Luo,Yi-jing Gao,Yi-long Yan,Pei-yuan Gao,Xing Zhong,Jian-guo Wang
Herein we report a facile bottom-up strategy to prepare highly dispersed supported Co 3 O 4 on N-doped Porous Carbon (NPC). Specifically, ZIF-67 (ZIF = Zeolitic Imidazolate Frameworks) microcrystals firstly grow on benzoic acid modified covalent organic framework (BFC), resulting in ZIF-67/COF composite. Subsequently, highly dispersed Co 3 O 4 /NPC was obtained via the calcination of ZIF-67/COF. Interestingly, high dispersion of supported Co 3 O 4 is dominated by homogeneous distribution of benzoic acid auchoring on nanoporous COF . More notably, largely triggered by the porosity and confining effect of COF , the resultant Co 3 O 4 /NPC features highly active crystal plane and a large specific surface area of 228.0 m 2 /g. Furthermore, the oxygen evolution reaction (OER) measurement results demonstrated that highly dispersed Co 3 O 4 /NPC features good catalytic activity (330 mV overpotential at 10 mA.cm −2 , 79 mV.dec −1 Tafel slope and mass activity of 130 A.g −1 at overpotential of 400 mV) and durable stability, superior to currently available counterparts. Moreover, Li-ion battery (LIB) tests also showed high reversible capacity (785 mA.h.g −1 at 500 mA.g −1 ) as well as excellent cycling stability and rate performance. Furthermore, Density functional theory (DFT) calculation results demonstrated that these superior OER properties can be attributed to the geometrical and electronic effects of Co 3 O 4 /NPC on activation and adsorption/desorption of reaction species.
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Yangshuo Liu,Yaotian Yan,Feiyu Xu,Liang Qiao,Jiehe Sui,Wei Cai,Xiaohang Zheng
The activation of the lattice oxygen oxidation mechanism is vital for enhancing oxygen evolution reaction (OER) performance as it enables direct O–O bond formation, avoiding the *OOH formation. Compared with the conventional adsorbate evolution mechanism (AEM), the lattice oxygen-mediated mechanism (LOM) can break the theoretical limit of conventional adsorbate-based scaling relations and enhance the oxygen evolution reaction kinetics. Thus, there is an urgent need for an efficient strategy for designing OER electrocatalysts based on LOM. The O p band center is employed as descriptor in conjunction with machine learning to facilitate the activation of lattice oxygen. The descriptor can accelerate the catalyst design process as it circumvents the need for complex intermediate calculations. According to predictions, the Fe-Co 3 O 4 catalyst exhibits OER performance comparable to that of noble metal catalysts. The Fe-Co 3 O 4 catalyst achieves a low overpotential of 258 mV at 20 mA cm -2 in 0.5 M H 2 SO 4 , attributed to the shift in catalytic mechanism from AEM to LOM.The incorporation of Fe effectively induces an upshift in the O p band center and weakens the Co–O bond, thereby promoting direct O–O coupling for O 2 generation and consequently reducing the OER overpotential. Our study introduces a method to activate the lattice oxygen of metal oxide electrocatalysts, holding substantial promise for enhancing large-scale hydrogen production.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Hao Liu,Siqing Cheng,Jianjun Chen,Xiaoping Chen,Shangchao Xiong,Fang Huang,Houfeng Liu,Junhua Li,Chuanzhi Sun
Mitigating industrial nitrous oxide (N2O) emissions is critical for climate action, yet developing efficient low-temperature N2O decomposition catalysts under O2-containing conditions remains challenging. The weak oxygen–support interaction leads to unsatisfactory N2O decomposition performance in the supported Co3O4/CeO2 catalyst. This study aims to enhance the electronic oxide–support interaction in the Co3O4/CeO2 catalyst through Zn doping, thereby improving its catalytic performance for N2O decomposition under O2-rich conditions. The results demonstrate that, in the presence of 5% O2, the activation energy of the catalyst sharply decreases from 117.5 to 60.4 kJ·mol–1 after Zn doping (Co2.4Zn0.6O4/CeO2). Additionally, the doped catalyst exhibits strong durability to the O2 + H2O + NOx impurity gas components. Advanced spectral characterization and density functional theory calculations reveal that Zn doping modulates the geometry and electronic structure of active cobalt sites, optimizing the adsorption and activation capabilities of N2O molecules. This study elucidates the mechanism of N2O decomposition over the catalysts and establishes a clear structure–activity relationship between the atomic-scale configuration of active sites and their performance. These findings provide critical insights for designing efficient supported oxide catalysts through targeted doping strategies and offer new perspectives for developing highly efficient and low-energy N2O decomposition catalysts.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Mingyang Li,Gaoyuan Gu,Xudong Xiao,Hui Li,Jun Yang
Ammonia has emerged as a promising hydrogen carrier due to its high hydrogen density and ease of storage and transport. However, the widespread application of ammonia decomposition is hindered by the rapid deactivation and limited intrinsic activity of conventional transition metal catalysts. In this work, a well-defined Mg Al co-doped cobalt-based spinel oxide (Mg 0.18 Al 0.12 Co 2.7 O 4 ) is developed that undergoes in-situ self-assembly under reaction conditions to form a core-shell structure (Co@MgAlO x ). This unique structure features metallic Co nanoparticles as the active core, encapsulated by a dispersed Mg Al oxide shell. The resulting catalyst achieves a hydrogen production rate of 33.5 mmol∙g cat −1 ∙min −1 at 600 °C in ammonia decomposition. Comprehensive characterization reveals that the Mg Al oxide shell not only physically confines the Co nanoparticles against sintering but also induces an electron-deficient state in Co via strong metal-support interactions, leading to a long-term stability about 350 h and cycle stability for six times. Combined with theoretical calculation results, the doping of Al promotes the initial adsorption and dissociation of NH x , while Mg and Al co-doping alleviate lowering the energy barrier of the nitrogen desorption, which is the rate-determining step. This study underscores the importance of synergistic Mg Al co-doping in guiding a stable and active structure, providing an in-situ self-assembly strategy for the rational design of heterogeneous catalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Qi Zhao,Xiaoyu Zheng,Lin Xing,Yulian Tang,Xuemei Zhou,Lei Hu,Wenli Yao,Zhengquan Yan
To enlarge the perspective of nanozyme , 2-dimensional Co 3 O 4 stabilizing Rh nano composite (2D Co 3 O 4 @Rh NC) was identified and developed first by one-pot surfactant-aided oxido-reduction. By virtue of the synergetic-reinforcing oxidase activity between 2D Co 3 O 4 substrate and Rh nano particles , the obtained 2D Co 3 O 4 @Rh NC could catalyze the oxidation of chromogenic substrate 3,3′,5,5,’-tetramethylbenzidine (TMB) to blue oxTMB with quite a low Michaelis-Menten constant ( K m ) of 0.018 mM and a quick v max of 6.45 × 10 –8 M s –1 , expressing superior oxidase-like catalysis with a wide temperature range from 20 to 60 °C. Importantly, either bioactive urea or toxic p-aminophenol ( p -Ap) could exclusively alter the existed state of oxTMB with differentiable color changes. Under the optimized conditions, 2D Co 3 O 4 @Rh NC was successfully applied for ratiometric colorimetric sensing urea and p -Ap in environmental water, soil and urine samples with low detection limits (1.1 μM for urea and 0.68 μM for p -Ap) and satisfactory recoveries (96.0–105.8%). The synergetic enhanced oxidase-like activity of 2D Co 3 O 4 @Rh NC and the different reaction mechanisms of the 2D Co 3 O 4 @Rh NC-TMB system to urea and p -Ap were investigated. Not only does the work provide an efficient way for sensing organic pollution of p -Ap, it will offer an efficient potential for diagnosing urea-related diseases on clinical medical testing in future.
✓ 已验证
DOI
高影响因子
IONICS
·
2018
·Vol. 25
·期 2
·475-482
·
IF 2.347
Xiao Mingjun,Meng Yanshuang,Duan Chaoyu,Hu Qianru,Li Ruinian,Zhu Fuliang,Zhang Yue
In this work, the Co 3 O 4 /nitrogen-doped carbon (Co 3 O 4 /NDC) composite was prepared by in situ solvothermal method using ionic liquid as carbon and nitrogen sources. The Co 3 O 4 /NDC composite was characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and electrochemical testing. The HRTEM results show that there is a thin layer of amorphous carbon film on the surface of Co 3 O 4 particles, which can improve the conductivity of Co 3 O 4 and inhibit the fragmentation of material caused by volume expansion. When the Co 3 O 4 /NDC composite is used as the anode material of lithium-ion batteries, the reversible capacity is 1056 mAh g −1 after 50 cycles at 0.1 C. The superior electrochemical performance can be attributed to the synergistic effect of amorphous carbon film, nitrogen doping, and Co 3 O 4 particles.
研究领域:
材料科学
·
电化学
·
储能
·
纳米复合材料
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Dandan Song,Xiaoyue Xu,Xingge Huang,Guoqiang Li,Xiaotong Wang,Yisong Zhao,Faming Gao
Heteroatom doped graphdiyne (GDY) has been demonstrated to be an effective strategy for achieving outstanding electrochemical properties, including improved electrocatalytic activity , tunable electronic properties and high electronic conductivity, by producing numerous heteroatomic defects as well as active sites. Extensive efforts have been devoted to the issue of single element doping of GDY. Introducing two or more kinds of heteroatoms into GDY materials may create a synergic effect between the co-dopants, thus generating superior electrochemical performance. Nevertheless, little research on multiple elements co-doped GDY, especially in the application of constructing electrochemical biosensor . Herein, nitrogen and fluoride co-doped GDY (N–F-GDY) has been synthesized and employed to combine with NiCo 2 O 4 –Co 3 O 4 hollow multishelled nanocages to establish an ultrasensitive electrochemical biosensor for the assay of pesticide residue . The as-prepared electrochemical biosensor possesses a wide linear range of 0.448 pM–44.8 nM for monocrotophos detection and a low detection limit of 0.0166 fM (S/N = 3).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Shi-Wen Lv,Lingjie Ye,Jialu Pan,Xiang Chen,Yi Liu,Yanqing Cong
It is of great significance to regulate rationally the activation mechanism of persulfate for promoting the development of sulfate radical-based advanced oxidation processes in wastewater treatment . Herein, carbon coated porous Co 3 O 4 with hollow structure was synthesized. Notably, the formation of porous hollow structure improved specific surface area of Co 3 O 4 and offered more redox couples of Co 2+ /Co 3+ , thereby reducing electron transfer resistance. Thus, the generation of reactive oxygen species and the role of high-valent transition metal complexes (namely Co 3 O 4 Co 4+ ) were improved. The formation of carbon layer on the Co 3 O 4 surface can avoid the release of Co ion during reaction process. Benefiting from the role of carbon layer in electron transport, catalyst-mediated the direct electron transfer from pollutant to PMS was boosted. Radical and nonradical pathways worked in coordination each other and realized the rapid removal of various organic pollutants in the presence of a little PMS. In short, current work revealed that modulating rationally the microstructure of catalyst was an efficient strategy for achieving controllable regulation of PMS activation process. More significantly, whether the direct electron transfer process can occur or not depended on both catalyst structure and electronic density of pollutants.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Huijiao Wang,Lingwei Gao,Yuxin Xie,Gang Yu,Yujue Wang
Singlet oxygen ( 1 O 2 ) has often been identified by the popularly used quenching method as a more important reactive species (RS) than sulfate radicals (SO 4 •− ) and hydroxyl radicals ( • OH) for pollutant abatement during persulfate-based advanced oxidation processes (PS-AOPs), especially those activated by carbon-based catalysts. However, latest studies have demonstrated that the quenching method actually can often mislead the interpretations of the role of RS for pollutant abatement during AOPs due to various confounding effects caused by adding high-concentration quenchers in the system. To clarify the role of 1 O 2 in PS-AOPs, this study developed a probe compound-based experimental and kinetic model to quantify the concentrations and exposures of 1 O 2 , SO 4 •− , and • OH, as well as their relative contributions to pollutant abatement during a cobalt oxide incorporated carbon nanotubes activated peroxymonosulfate (Co 3 O 4 @CNTs/PMS) process. Results show that during the Co 3 O 4 @CNTs/PMS process, the exposures and transient concentrations of 1 O 2 were about 19.6 and 41.3 times higher than those of SO 4 •− and • OH, respectively. However, the relative contribution of 1 O 2 to the abatement of most pollutants tested in this study (e.g., sulfisoxazole, sulfamethoxyprazine, trimethoprim, and metoprolol) is generally negligible ( f 1 O 2 ≤ 8%) compared to that of SO 4 •− and • OH ( f SO 4 • − = 15%−98% and f • OH = 2%−78%) because of the significantly lower reactivity of 1 O 2 with these compounds than that of SO 4 •− and • OH. Reasons for misidentifying 1 O 2 as the dominant RS for pollutant abatement by the quenching method were then analyzed based on reaction kinetics principles. The results of this study highlight that while 1 O 2 can be generated in significant amounts and be present at higher concentrations than SO 4 •− and • OH in PS-AOP systems, 1 O 2 is unlikely to be the dominant RS for the abatement of most pollutants during the PS-AOPs because of its weak and selective oxidation capacity, and caution should be taken when using the quenching method to evaluate the role of RS for pollutant abatement by the PS-AOPs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Mengfan Cao,Yanjiao Zou,Yuanyuan Zhang,Ting Zeng,Qijin Wan,Guosong Lai,Nianjun Yang
Here we present a facile, rapid and reliable electrochemical sensor for quantitative analysis of hazardous photographic developing agents, including metol (MT), hydroquinone (HQ) and catechol (CC). They have been identified as usual contaminants in environment and water samples. This sensor is based on a nanocomposite of three-dimensional (3D) porous flower-like Co 3 O 4 @C hybrid and graphene nanoplates (Co 3 O 4 @C/GNP). The Co 3 O 4 @C/GNP compoiste is prepared by a two-steps procedure, consisting of the composite synthesis of a Co-MOF precursor and GNPs in the first step and subsequently direct calcination process in the N 2 atmosphere. The morphology, composition, and electrochemical behavior of the Co 3 O 4 @C/GNP composite is characterized by using microscopic methods and electrochemical techniques, revealing its 3D porous structure, abundant pores, a large electrode active area, a high conductivity, outstanding electrocatalytic and sensing performance toward MT, HQ, and CC. Taking advantages of a huge electroactive surface area and a fast electron transfer rate of GNPs and strong electrical catalytic ability of the Co 3 O 4 @C hybrid, the fabricated Co 3 O 4 @C/GNP sensor displays high sensitivity for quantitative analysis of MT, HQ and CC. Their detection limits are as low as 5.1, 14.7 and 169 nM (S/ N = 3), respectively. Beyond that, the proposed Co 3 O 4 @C/GNP electrochemical sensor shows strong reproducibility, good stability and selectivity in the voltammetric quantitation of these analytes. It has been also successfully applied in measuring these photographic developing agents in water environment. Consequently, the fabricated Co 3 O 4 @C/GNP composite is expected to be an excellent electrode material in the applications of electrochemical sensing.
✓ 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）