JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 9
·6262-6272
·
IF 2.779
Guo Xiaogang,Liang Taotao,Liu Guixiu,He Yuanzhen,Kong Shuying,Islam Md. Labu,Yuan Binfang
Achieving controllable film-forming process is always a difficult issue for practical application, especially for bi-/multiple component composite materials. Thus, this paper firstly developed a conveniently and controllable electrophoretic assembly technique under mild conditions to design nano-Al-doped@Co 3 O 4 energetic film with wide potential applications. The stable suspension consists of isopropyl alcohol with the tracing of polyethylenimine and tween 80. The high crystallinity and uniformity of structure in target films were demonstrated by FESEM, EDX, XRD, and FT-IR techniques. Electrophoretic assembly dynamics of Al/Co 3 O 4 particles were deeply explored to provide a theoretical foundation for optimizing exothermic performance. The exothermic performance of target film can be accurately adjusted, and the output of heat ( Q ) and activation energy ( E a ) can reach up to ~ 3.6 kJ/g (close to 85% of theoretical value) and low to 230.01 kJ/mol, respectively. This breakthrough will substantially push forward the facile functional film-forming process of different kinds of particles used in fields of electronics, military, aviation, etc.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 5
·1921-1932
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IF 4.478
Cao Xiyue,Liu Min,Zhao Mu,Li Jie,Xia Jianfei,Zou Tingting,Wang Zonghua
In this paper, novel synergetic PtNP@Co 3 O 4 hollow nanopolyhedrals with peroxidase-like activities are designed and prepared, which can be used as electrochemical and colorimetric signal labels for the enzyme-free dual-channel homogeneous sensing of prostate-specific antigen. When prostate-specific antigens are present, the aptamer-modified PtNP@Co 3 O 4 hollow nanopolyhedrals and magnetic beads form sandwich structures, which have excellent peroxidase-like activities, because of the synergetic effect of PtNP@Co 3 O 4 hollow nanopolyhedrals. The sandwich structures can be separated from the mixture by the magnetic effect of the magnetic beads and catalyze the redox reactions between H 2 O 2 and TMB, generating quantitative electrochemical and colorimetric responses in homogeneous solution simultaneously. Under the optimized conditions, the linear range of both electrochemical (0.01 to 10 ng/ml) and colorimetric (0.01–15 ng/ml) channels can satisfy the demand of prostate-specific antigen detection in clinic (4 ng/ml), and the electrochemical and colorimetric channels have a low detection limit of 0.0079 ng/ml and 0.01 ng/ml respectively without using natural enzymes. The strategy by using synergetic PtNP@Co 3 O 4 hollow nanopolyhedrals as signal probes provides a promising scheme for developing simple, rapid, reliable, and ultrasensitive dual-channel homogeneous biosensors, which has a great potential as a powerful tool in prostate cancer diagnosis. Graphical abstract
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JOURNAL OF SOLID STATE CHEMISTRY
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2022
·
IF 3.656
Ying Yan,Zijian Wang,Ting Ding,Huiping Zhang
Co 3 O 4 catalysts supported on paper-like stainless steel fibers (PSSF) were prepared by MOFs-templated (M) method and applied for catalytic combustion of isopropanol. Physicochemical properties of the as-synthesized Co 3 O 4 catalysts were investigated by SEM, EDS mapping, TEM, XRD , BET, XPS and H 2 -TPR, respectively. Characterization results of SEM and TEM shown that Co 3 O 4 (M)-350 and Co 3 O 4 (M)-400 still remained the dodecahedron shape of the ZIF-67 precursor and possessed porous structures. The XPS results shown that the ratio of Co 3+ /Co 2+ and O c /O c + O a + O l firstly increased and then decreased with the increase of calcination temperature. Among the as-synthesized catalysts, Co 3 O 4 (M)-400 exhibited the highest activity for the catalytic combustion of isopropanol with the T 50 and T 90 values of 258 °C and 281 °C, respectively, which was associated with high BET surface area, high amount of Co 3+ species and abundant surface chemisorbed oxygen. Moreover, Co 3 O 4 (M)-400 was employed as a structured catalyst for isopropanol combustion, the catalytic kinetics were studied based on different feed concentration, bed height and GHSV. The experimental results indicated that the T 50 and T 90 of isopropanol combustion over Co 3 O 4 (M)-400 with the bed height of 2 cm were increased slightly as the GHSV and feed concentration of isopropanol increased.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Rongyao Ma,Guolang Zhou,Mingrui Gu,Xin Tang,Wenhao Ding,Yu Guan,Yexin Jiang,Jingzhou Yin,Lili Zhang,Edison Huixiang Ang
In this study, we synthesized Co-based coordination polymer-derived nitrogen-doped carbon-coated Co 3 O 4 spheres (Co 3 O 4 @NC) and yolk-shell Co 3 O 4 spheres (Co 3 O 4 -YS) under various atmospheric conditions to explore their efficacy in activating peroxymonosulfate (PMS) for tetracycline (TC) degradation. The Co 3 O 4 @NC, featuring a significantly higher specific surface area (268.4 m 2 /g), exhibited remarkable performance by achieving 90% TC removal in 5 minutes using 0.2 g/L PMS and 0.1 g/L of Co 3 O 4 @NC. This reaction rate was 9.2 times higher than that observed with Co 3 O 4 -YS. Furthermore, the Co 3 O 4 @NC/PMS system demonstrated exceptional stability across a wide pH range, in complex water compositions, and the presence of common coexisting ions. The unique coated structures effectively minimized the leaching of Co ions (below 0.447 mg/L). Additionally, the strong magnetism of Co 3 O 4 @NC allows for easy separation under a magnetic field. Mechanistic investigations identified 1 O 2 , ∙OH, O 2 ∙ - , and SO 4 ∙ - as the principal reactive species. The study also explored potential degradation pathways and toxicity.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Mingwei Hu,Yongsheng Deng,Rong Guo,Yinghao Jia,Wenpu Zhang,Xinghui Hou,Ying Zhou
Co 3 O 4 -ZIF- x ( x = 0,1,2,3) composites have been prepared by in-situ growth of ZIF membrane on MOFs-derived hierarchical porous Co 3 O 4 by the solvothermal method with adjusting the ratio of dimethylimidazole. The effects of ZIF membrane on Co 3 O 4 structure and acetone-sensing properties are investigated by the techniques of XRD , Raman, SEM, TEM, BET, XPS and performance testing, and the possible gas-sensing enhancement mechanism is analyzed. The results show that the typical Co 3 O 4 -ZIF-1 sensor has the maximum response of 77.8–50 ppm acetone at 180 °C, the short response/recovery time of 7/35 s, and the low detection limit of 0.1 ppm (3.28). It also has the reliable acetone selectivity against to other interfering gases, as well as good repeatability and high stability. Its enhanced acetone-sensing property may be attributed to the synergistic effect of the improved surface state , high specific surface area , adjustable pore size and rich reaction activation sites, which caused by the hierarchical porous structure of MOFs-derived Co 3 O 4 and the gas adsorption and enrichment effect of ZIF membrane, promoting the further reaction and diffusion of acetone. The “internal construction and external modification” role of MOFs playing in Co 3 O 4 provides a new idea for designing high performance sensing materials.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Liyong Du,Yi Liu,Xiufen You,Heming Sun
Metal oxide-based gas sensors are widely used in the detection of toxic and harmful gases due to their advantages of high precision, convenient use and stable performance, but their application range is limited due to the high working temperature. In this work, MOF-derived flower-like Fe-doped Co 3 O 4 porous hollow structures are obtained using a simple solvothermal method . The obtained samples are characterized in terms of their crystalline structure, morphology, chemical composition , optical properties and specific surface area . This study systematically investigates the sensing performance of pristine and Fe-doped Co 3 O 4 samples. The results show that the 2 at% Fe-Co 3 O 4 sample has the best n-butanol sensing properties. This sample exhibits high response and rapid response/recovery speed at a low working temperature of 110 °C, as well as good repeatability and anti-humidity features. The enhanced sensing properties can be attributed to several factors, including the adjustment of baseline resistance, increase in oxygen vacancies , decrease in bandgap, and the formation of unique hollow and porous structures . Overall, this work provides valuable insights into the potential applications of Fe-doped Co 3 O 4 materials in sensing technologies.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Juan Zhang,Yulong Ma,Yonggang Sun,Lei Wang,Bolong Zhao,Min Xu,Liqiong Wang,Feng Lin,Yongsheng Ren
The introduction of oxygen vacancies (O v ) into Co-based metal oxides has been considered a promising strategy for activating peroxymonosulfate (PMS) to effectively degrade refractory organic contaminants. However, the types of reactive oxygen species (ROS) generated in O v -catalyst/PMS systems exhibited variability. Therefore, the effect of the interaction between O v and PMS on ROS generation required further research. Herein, the O v -tuned 2D porous Co 3 O 4 catalysts were easily constructed by simply controlling the NaBH 4 concentration. The as-prepared 2D Co 3 O 4 -1.6 had the highest O v content (2.88 × 10 14 spins/g, δ = 0.726), and its catalytic activity for benzotriazole (BTA) degradation ( k = 0.032 min −1 ) was three times higher than that of pristine 2D Co 3 O 4 ( k = 0.011 min −1 ). A series of characterizations and DFT calculations demonstrated that the major active site was Co(II), with O v serving as an localized electron-rich co-site. These dual sites synergistically improved the adsorption capacity for PMS, enabling rapidly electrons transfer to PMS while promoting the dissociation of O-O bond in PMS to form multiple ROS. Compared to the pristine 2D Co 3 O 4 /PMS system, which was dominated only by SO 4 − , the key ROS in the 2D Co 3 O 4 -1.6/PMS system were found to be 1 O 2 (3.56 µM) and SO 4 − (2.53 µM), while both O 2 – (0.72 µM) and OH (0.65 µM) were involved in the activation reaction, the contributions of these four ROS were as follows: 1 O 2 (36.8%) > SO 4 − (25.4%) > O 2 – (9.5%) > OH (6.3%). Finally, three possible degradation pathways of BTA were proposed, and the toxicity of BTA degradation decreased with time, which was consistent with the toxicity prediction results of eleven intermediates. This study provides new insights into the key role of O v in the heterogeneous catalytic system of PMS-based advanced oxidation processes.
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Journal of Energy Storage
·
2023
·
IF 9.4
Dingbang Liu,Zhongkai Wu,Na Zhan,Zihao Wang,Yilin Peng,Mingyang Li,Zijian Li,Zihao Huang,Fei Gao,Zhenzhi Cheng,Weiping Zhou,Guangshen Luo
Ferrite, a class of transition metal oxides, has emerged as a promising material for electrochemical energy storage due to its cost-effectiveness and high theoretical capacity. However, the tendency of ferrite to agglomerate hinders its practical application. Here, we report a facile method to fabricate CoFe 2 O 4 @Co 3 O 4 flower-like sphere and form a unique core-shell structure. In this composite, flake Co 3 O 4 pile up to form shell which cladding the CoFe 2 O 4 core. Crumpled shell provide ultra-high specific surface area (128.54 m 2 /g) to expose more electrochemical active sites, benefiting effective electrons transfer. As a result, the optimized flower-like spherical structure electrode exhibited an exceptionally high capacity of 2834 F g −1 at a current density of 1 A g −1 . Additionally, the electrode demonstrated outstanding rate capability, retaining 78 % of its capacity at a current density of 10 A g −1 .
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shouji Huang,Liwen Yang,Guobao Xu,Tongye Wei,Jiao Tian,Xiong Liu,Huapeng Li,Ziyuan Xiang,Juexian Cao,Xiaolin Wei
A template-free strategy is developed to construct a composite of hollow Co 3 O 4 nanocrystals with N-doped carbon and carbon nanotubes (CNTs) as freestanding anodes for Li and Na ion batteries (LIBs/NIBs) via a chemical precipitation and subsequent two-step annealing. In this composite, the N-doped carbon coated hollow Co 3 O 4 nanocrystals have a average diameter of 12 nm and are anchored tightly on highly conductive CNT substrates. Such nanocomposite possesses large specific surface area to supply ample active sites, highly conductive carbon networks to enhance electric conductivity, short ion diffusion distance to improve ion transport, and large interior space to accommodate volume expansion during repeatedly electrochemical reaction. Furthermore, kinetic analysis reveal that pseudocapacitive-controlled Li/Na storages plays a vital role. The freestanding composite as a anode for the LIBs exhibits large reversible capacity (1468 mAh g −1 after 130 cycles at 0.2 A g −1 ), superior rate performance (271 mAh g −1 at 12.5 A g −1 ) and good cyclic stability (905 mAh g −1 after 350 cycles at 1.0 A g −1 ). For the NIBs, the freestanding composite delivers attractive rate performance (104 mAh g −1 at 10 A g −1 ) and long cyclic performance (189 mAh g −1 after 400 cycles at 2.0 A g −1 ). Moreover, the assembled Li/Na full cell using the freestanding composite as anodes and LiFePO 4 (for LIBs) and Na 3 V 2 (PO 4 ) 3 (For NIBs) as the cathodes display superior electrochemical performances. Our results suggest the prepared freestanding composite has a highly promising application in high-performance LIBs/NIBs.
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Analytical Methods
·
2021
·Vol. 13
·期 19
·2229-2237
·
IF 2.896
Miaomiao Zou,Li Feng,Xiaoyun Lin,Yongnian Ni
In this paper, a new Co3O4–Ni nanocomposite-modified glassy carbon electrode (Co3O4–NiNPs/GCE) was successfully constructed and used to detect glucose and hydrogen peroxide (H2O2). The morphologies and structures of the Co3O4 and Co3O4–Ni nanocomposites were characterized via transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The construction process of the modified electrode was characterized via electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) techniques. Co3O4–NiNPs/GCE shows more excellent electrocatalytic activity for the detection of glucose and H2O2 compared with Co3O4/GCE and NiNPs/GCE. The amperometric i–t method was used for the quantitative analysis of glucose and H2O2. The plots of current difference versus concentration of glucose and H2O2 were linear in the range of 0.3–550 μM and 0.5–89 μM, respectively. The corresponding limits of detection (LODs) were 0.086 μM and 0.23 μM for glucose and H2O2, respectively. This recommended sensor was successfully applied for the quantitative analysis of glucose in fruit and H2O2 in water samples.
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CHEMOSPHERE
·
2021
·
IF 7.086
Zhiruo Wu,Huimin Niu,Jinghuan Chen,Jianmeng Chen
The development of active transition-metal oxide (TMO) catalysts for the abatement of volatile organic compounds (VOCs) remains a great challenge. Controllable synthesis of TMOs with specific morphology and suitable composition is a promising way for acquiring efficient oxidation catalysts. Herein, a series of hierarchical Co 3 O 4 /CoNi-layered double oxides (CoNi-LDO) nanocages covered by interlaced nanosheets were synthesized using a cobalt metal-organic framework (Co-MOF)-based strategy. The textural properties, morphology, surface chemical state, and reducibility of the CoNi-LDO catalysts were systematically characterized by various techniques. The catalytic activity toward toluene oxidation and the stability performance was investigated. Results demonstrated that the morphology, composition, and textual properties can be controlled by tuning the post-synthetic etching reaction conditions. Benefiting from the structural and compositional merits, as well as the superior low-temperature reducibility, the CoNi-LDO-1 catalyst (Ni/Co molar ratio was 0.39) with core-shell structure exhibited excellent activity toward toluene oxidation. Our work offers a new strategy for the design of high-performance oxidation catalysts for the abatement of VOCs.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Liuyun Chen,Xinling Xie,Tongming Su,Hongbing Ji,Zuzeng Qin
Photocatalytic hydrogen production from water splitting production is a promising strategy to solve the energy crisis and environmental pollution. In the present work, Co 3 O 4 /CdS composites were prepared by ultrasonication and stirring, and used for photocatalytic water splitting. The results showed a Co-S chemical bonds were formed at the interfaces between the Co 3 O 4 and the CdS, which promoted the charge transfer rate between the CdS and Co 3 O 4 . Meanwhile, the recombination of the electron-hole pairs was further restrained by the Co 3 O 4 /CdS p-n heterojunction. The 10%-Co 3 O 4 /CdS composites exhibited an excellent photocatalytic hydrogen production rate of 142.62 μmol∙h −1 , which was 20 times higher than that of CdS (6.85 μmol∙h −1 ), and the Co 3 O 4 /CdS showed excellent stability in the photocatalytic water splitting reaction. Moreover, a formation process of Co 3 O 4 /CdS p-n heterojunction and a mechanism of Co 3 O 4 /CdS p-n heterojunction avoiding the recombination of photocatalytic electrons and holes to enhance photocatalytic activity was proposed.
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