JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 6
·1-15
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IF 2.8
Xiao Lijuan,Zhou Jingkai,Yu Zhixuan,Dong Huihao,Chen Yan
In the research of flexible smart electronics, obtaining particular structure electrodes to provide excellent electrochemical performance remains challenging. Here we report the synthesis and characterization of nanocomposite by a two-step method of polypyrrole (PPy) with Co 3 O 4 @SiO 2 in the presence of an oxidizing agent. Co 3 O 4 @SiO 2 was prepared by firing SiO 2 -coated zeolitic imidazolate framework-67 (ZIF-67/SiO 2 ) in a tubular furnace at a high temperature. Subsequently, PPy was coated and dispersed on Co 3 O 4 @SiO 2 by chemical methods at room temperature. In addition, we also explored the optimal ratio experiment of Co 3 O 4 @SiO 2 and PPy. The results show that the specific capacitance of Co 3 O 4 @SiO 2 and Co 3 O 4 @SiO 2 /PPy (2 mL) is 33.36 A/g and 107.7 A/g, at 0.6 A/g current density, indicating that the addition of PPy greatly improves the electrochemical performance of Co 3 O 4 @SiO 2 . This may be due to synergies between Co 3 O 4 @SiO 2 and PPy polymers, and the addition of PPy may help Co 3 O 4 @SiO 2 to construct more ion channels to enhance ion transport. This report will contribute to the development and application of cobalt oxide and silicon-shell electrode materials in the field of energy storage. It is helpful for the development and application of cobalt oxide and silicon-shell structures as electrode materials in the field of energy storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2023
·Vol. 30
·期 2
·1075-1087
·
IF 2.8
Zhou Jingkai,Xiao Lijuan,Zhou Song,Liu Jiaqin,Huang Lvhang,Chen Yan
Obtaining electrode materials with excellent electrochemical properties is always a challenge in the research of new energy materials. This paper presents a novel composite material prepared using a simple method, which involves embedding core–shell Co 3 O 4 @SiO 2 nanoparticles onto highly conductive reduced graphene oxide (rGO) with excellent electrochemical performance. The results indicate that the encapsulation of the polymer with the core–shell material enhances the electrochemical performance. In this process, graphene oxide is reduced to reduced graphene oxide (rGO) by the hydrothermal method, and then the prepared core–shell Co 3 O 4 @SiO 2 nanoparticles are embedded into the network structure of reduced graphene oxide (rGO). In addition, we investigate the optimal mass ratio of the core–shell material Co 3 O 4 @SiO 2 and rGO in the Co 3 O 4 @SiO 2 /rGO composite. We prepare composites with different ratios of 4:1, 2:1, 4:3, 1:1, and 4:5, Co 3 O 4 @SiO 2 /rGO. The experimental results illustrate that when the current density is 0.4 A/g, the specific capacitance of the composite Co 3 O 4 @SiO 2 /rGO (1:1) is up to 216 F/g, and the volumetric capacitance is 372 F cm −3 , which is more than fivefold higher than that of the core–shell material Co 3 O 4 @SiO 2 . Such large performance improvement is mainly attributed to the addition of rGO which can improve the conductivity of the entire composite material and the aggregation of Co 3 O 4 @SiO 2 , thus providing more active sites. This study confirms that the electrochemical properties of graphene oxide can be greatly improved by the combination of hydrothermal reduction graphene oxide with core–shell material Co 3 O 4 @SiO 2 , which provides a certain reference value for the further research of high-performance electrode materials.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2020
·
IF 3.784
Meiling Zhang,Jing Yu,Jun Wang
Slippery liquid-infused porous surfaces (SLIPSs) are gaining remarkable amount of interest because of their exceptional liquid and solid repellency properties, their tolerance to high pressures and transparency. The lubricant layer may be depleted, leading to the loss of the “slippery” characteristics of the SLIPSs. Herein, we aimed to increase the lubricant storage capacity to enhance the long-term stability of SLIPSs through the construction of a hierarchical structure on the alloy substrates; the SLIPS herein thus represents a new kind of anti-corrosion material. By comparing the wetting speed of the lubricant and shear resistance properties, we showed that SLIPS with a ZnO/Co 3 O 4 /SiO 2 hierarchical structure provided the best lubricant wettability among the samples investigated herein; the lubricant was contained in the interior of this sample, thus providing the highest shear-tolerance observed. We also investigated the anti-corrosion property of SLIPSs that comprised ZnO/Co 3 O 4 /SiO 2 . The hierarchical structure had enough space to store the lubricant, which provided excellent corrosion protection for the alloy substrate.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 14
·2923-2928
·
IF 1.915
Xiaohua Li,Yun feng Bai,Feng Feng,Zhujun Zhang
Herein, we present a novel chemiluminescent (CL) sensor combined with an enzyme immobilization technique. We propose a versatile approach for the fabrication of CL sensors based on hydrophilic Co3O4@SiO2 mesoporous nanoparticles. The Co3O4@SiO2 mesoporous nanoparticles immobilized on the 96-well plates exhibited higher catalytic activity on the luminol–H2O2 CL reaction in an alkaline medium. Enzyme reactors were fabricated by incorporating functionalized mesoporous silica particles into calcium alginate fiber (CAF) to efficiently encapsulate the enzyme. The novel CL sensors combined with the enzyme reactors were reversible and reusable, which have been successfully exploited towards the high-throughput determination of glucose in human serum. The method was based on the generation of H2O2 from glucose in human serum by immobilized glucose oxidase (GOD). The linear range of the glucose concentration was 1.0 × 10−6 to 8.0 × 10−5 M and the detection limit was 1.2 × 10−7 M.
研究领域:
分析化学
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生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Dandan Wu,Runping Jia,Ming Wen,Shuai Zhong,Qingsheng Wu,Yongqing Fu,Shuhong Yu
A nanostructural catalyst with long-term durability under harsh conditions is very important for an outstanding catalytic performance. Herein, a new ultrastable PtCo/Co3O4–SiO2 nanocatalyst was explored to improve the catalytic performance of carbon monoxide (CO) oxidation by virtue of the surface active lattice oxygen derived from strong metal–support interactions. Such a structure can overcome the issues of Co3O4–SiO2 inactivation by water vapor and the Pt inferior activity at low temperature. Further, Co3O4–SiO2 nanosheets endow superior structure stability under high temperatures of up to 800 °C, which gives long-term catalytic cyclability of PtCo/Co3O4–SiO2 nanocomposites for CO oxidation. Moreover, the large specific surface areas (294 m2 g–1) of the nanosheet structure can expose abundant surface active lattice oxygen, which significantly enhanced the catalytic activity of CO oxidation at 50 °C over 30 days without apparent aggregation of PtCo nanoparticles after 20 cycles from 50 to 400 °C. It can be expected to be a promising candidate as an ultrastable efficient catalyst.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Yuntai Xi,Fang Dong,Zhongying Ji,Zhicheng Tang,Jiyi Zhang
The shortcomings of Co-based powder catalysts such as amorphous susceptibility to loss and high influence by pressure drop have become the key factors affecting their catalytic activity. In this paper, two methods were proposed to prepare novel monolithic Co 3 O 4 /SiO 2 catalysts by 3D direct ink writing (DIW) technology: (1) one-step method of printing the active component with supports, (2) two-step method of printing the support first, and then loading the active components. The results showed that the monolithic catalyst prepared by the two-step method possessed more abundant Co 3+ and lattice oxygen (O latt ) species than the one-step method, which jointly promoted the catalytic conversion of toluene. However, the catalyst printed by the one-step method had a stronger interaction between the active component and the support, showing better thermal stability and water resistance. In addition, the SiO 2 support (the calcined product after SiO 2 ink printing) enhances the activity, stability, compression resistance, while the N–SiO 2 support (the calcined product after SiO 2 precursor ink printing) can effectively prevent blockage of the pore structure by the binder and increase physical properties such as pore volume and specific surface area of Co 3 O 4 /SiO 2 catalyst.
研究领域:
材料科学
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环境催化
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2019
·
IF 1.901
Si-Ming Wu,Yi-Tian Wang,Nan Jiang,Shi-Tian Xiao,Jia-Xin Shi,Ying Wan,Zhi-Qiang Luo,Xiao-Yu Yang
Hierarchical structured mesoporous Co 3 O 4 /SiO 2 composites have been fabricated by the in-situ transformation of cobalt nanocrystals in the mesoporous silica. The hierarchical porous composites show good structural stability during the thermal treating process and demonstrate high crystallinity after phase transformation. The highly crystalline Co 3 O 4 /SiO 2 composite has uniform mesopores and exhibits good adsorption ability. This method offers a promising way to the design of hierarchical structured mesoporous materials with highly crystalline framework.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2013
·Vol. 172
·期 4
·1859-1865
·
IF 1.893
Li Xiaohua,Zhang Zhujun,Li Yongbo
This work presents a new chemiluminescent (CL) probe array assay. The new type CL probe array is based on enzyme mimics of Co 3 O 4 –SiO 2 mesoporous nanocomposite material, which not only have an excellent catalytic effect on the luminol–H 2 O 2 CL reaction in an alkaline medium but also can be used for the immobilization of enzymes. The linear range of the lactose concentration is 3.0 × 10 −7 to 1.0 × 10 −5 g mL −1 and the detection limit is 6.9 × 10 −8 g mL −1 . β-Galactosidase and glucose oxidase were selected as a model for enzyme assays to demonstrate the applicability of Co 3 O 4 –SiO 2 mesoporous nanocomposite material in multienzyme immobilization. The novel bifunctional CL probe array has been successfully applied to the determination of lactose in milk.
研究领域:
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2019
·
IF 1.479
Haiwang Wang,Jinlong Li,Wenge Liu,Xin Xu,Xinfang Wei,Li Chao,Ruifeng Zhao,Xiwei Qi,Ling Che
Co3O4, a transition metal oxide with spinel structure, has attracted wide attention due to its high catalytic activity in the field of catalytic oxidation of low concentration methane. However, due to the harsh conditions of methane catalytic reaction on catalysts, of which the high reaction temperature and complex reaction environment often lead to the deactivation and sintering of Co3O4 catalyst, improving the comprehensive performance of Co3O4 catalyst has become the current research hotspot and urgent demand. Core-shell flower-spheroidal cobalt-manganese composite catalyst was prepared in this paper by hydrothermal method, which gave full play to the advantages of carrier, special morphology and doping modification, reduced the risk of sintering and deactivation of Co3O4, and showed higher catalytic activity. Through SEM, EDS, and BET test and analysis, Mn1/Co/SiO2 has better microstructure and structure than Co3O4/SiO2. For example, the dispersion of Mn1/Co/SiO2 and the uniform distribution of elements are higher, and the values of surface area and pore volume are larger (129.956 m2/g → 180.639 m2/g, 0.333363 cm3/g → 0.398030 cm3/g). Combined with XRD and XPS analysis, it is concluded that Mn2+ manganese ion replaces Co2+ and causes lattice distortion of Co3O4, which promotes the production and mobility of reactive oxygen species, further increasing catalytic activity. Compared with Co3O4/SiO2, methane conversion at 350 °C and 450 °C increased by 10% and 6%, respectively.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）