APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Donghua Jia,Feng Zheng,Yaxuan Li,Yingying Niu,Yue Yang,Xiaodong Mao,Qiang Zhen,Peng Li,Yi Yu
In this work, two-dimensional V 2 O 5 nanosheet arrays/one-dimensional Co 3 O 4 nanoneedle arrays (2D VNSAs/1D CNNAs) composite is successfully prepared on nickel foam substrate. A variety of structural characterization techniques (SEM, XRD, EDS, TEM, and XPS) show that the as-prepared composite is V 2 O 5 monocrystal with a layered structure grafting by Co 3 O 4 polycrystal with a 1D needle-like structure. The VNSAs/CNNAs composite is used as supercapacitor electrode material. In a three-electrodes system, it shows high specific capacitance (C s ) values (1023 F g −1 @5 mV s −1 from CV curve and 826 F g −1 @0.5 A/g from GCD curve), a high coulombic efficiency (98.6 %@10 A/g), a good cyclic stability (92.7 % after 6000 cycles), a low charge transfer resistance (2.7 Ω), and a fast ionic diffusion rate (2.01 × 10 −8 cm 2 s −1 ). In a two-electrodes system, the assembled VNSAs/CNNAs//VNSAs/CNNAs symmetric supercapacitor has C s values of 445 F g −1 @5 mV s −1 and 363 F g −1 @0.5 A/g. Its cycle stability and rate capability could reach up to 92.3 % and 90.7 % after 6000 cycels, respectively. It also shows a high energy density (E d ) of 127.3 Wh kg −1 @400 W kg −1 and can retain 72.2 Wh kg −1 @8000 W kg −1 . The excellent electrochemical properties indicate that VNSAs/CNNAs composite can greatly increase the E d of supercapacitors.
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Xin Guo,Ying Liu,Lixun Feng,Peiran Xu,Yuan Yang,Xiaochun Gao,Huiting Sui,Xiaoning Wang,Xitao Yin,Xiaoguang Ma
Metal-organic frameworks (MOFs) are a promising class of electrode materials for supercapacitors. In this work, MOF-derived transition metal oxide/carbon nanofiber composites (ZnCoO/C) are synthesized through a freeze-drying method followed by a carbonization process. The crystal structure of the ZnCoO/C product is regulated by changing the ratio of Co to Zn, which in turn influences its electrode properties. The electrochemical tests reveal that the ZnCoO/C-2 electrode demonstrates an impressive specific capacitance of 356.3 F g -1 at 1 A g -1 and maintains a capacitance retention exceeding 77 % after 10,000 cycles, which exhibits a good cycling stability. It is found that appropriate Zn substitution can diminish the crystallinity of the material, augment the active sites, and enhance the specific capacitance of the electrode material. Considering the heteroatom substitution tends to introduce vacancy defects in the crystals, this work theoretically explores the effect of oxygen vacancies on the electrode materials. As the oxygen vacancy concentration increases, the band gap and the adsorption energy of the models decrease; conversely, the formation energy of the models shows an increasing tendency. This indicates that an increase in oxygen vacancies can enhance the electrical conductivity of electrode materials and facilitate their kinetic process but destroy the stability of crystal. This research explores the interplay between the microstructure and the electrochemical performance of electrode materials, providing a foundational reference for the design of structurally optimized high-performance electrodes and further elucidating the energy storage mechanisms in supercapacitors.
✓ 已验证
产品关联
DOI
高影响因子
CHEMBIOCHEM
·
2025
·
IF 2.8
Zhenyuan Yang,Siyu Ding,Yihao Li,Shaojie Xia,Yaohui Wu,Yonghong Wang
In recent years, nanozymes have increasingly attracted the attention of researchers due to their low cost, high stability, and straightforward preparation when compared with natural enzymes. Furthermore, the biocompatibility of nanozymes has been enhanced through surface adsorption, hence broadening their application scope. In this work, Co 3 O 4 nanozyme was adsorbed with diverse DNA, and the catalytic performance was significantly boosted compared with the pure Co 3 O 4 nanozyme. Peroxidase-like activity assays revealed three key findings. First, the adsorption of single-stranded DNA proved to be more effective than that of double-stranded DNA. Second, the 50-nucleotide single-stranded DNA sequence yielded the stronger catalytic signal. Ultimately, guanine rich nucleotide exhibited the higher catalytic efficiency in single-stranded DNA and cytosine-guanine rich nucleotide exhibited the stronger catalytic efficiency in double-stranded DNA. The kinetic results of its catalytic activity showed that the catalysis of the adsorbed Co 3 O 4 nanozyme followed the Michaelis–Menten kinetics. In parallel, the K m value of 50-nucleotide single-stranded DNA adsorption was the lowest of diverse DNA, which was 6.11 mM and 54.8% of the pure Co 3 O 4 nanozyme. These findings establish DNA adsorption as an effective strategy for enhancing the catalytic activity of Co 3 O 4 nanozymes, presenting significant potential for applications in medical diagnostics and antioxidant-related fields. Graphical In this work, the regulatory effect of diverse DNA on the peroxidase-like activity of Co 3 O 4 NPs was investigated for the first time, offering a novel perspective for the application of Co 3 O 4 NPs in photometric detection.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Dongan Huang,Lukai Zhuang,Xiaodan Zhao,Zhongmin Fang,Jing Zou
Tetracycline contamination in the aqueous environments has attracted increasing attention owing to the antibiotic resistance. Heterogeneous advanced oxidation processes (AOPs) based on sulfite activation with metal oxides have been proposed for tetracycline abatement, yet the overall efficiency is hampered by the sluggish redox cycling of metal species. Herein, we report a novel process combining sulfite with cationic vacancy-enriched Co 3 O 4 (simplified as Co 3 O 4 -Vc), which enables the acceleration of sulfite autoxidation to generate radicals. Structural and morphological characterizations of Co 3 O 4 -Vc are performed and the effect of pH and radical scavengers on tetracycline abatement are studied. At the lower dosge of 0.01 g/L Co 3 O 4 -Vc and sulfite, tetracycline can be removed by 90–100 % within 10 min for pH 8.0–10.0, in which HO • and SO 4 •− are identified as the main reactive radicals and quantified as 1.0 and 4.2 μM, respectively. Radical quenching with methanol and tert-butanol, together with EPR using DMPO, evidence the formation of SO 3 •− and confirm SO 4 •− as the dominant oxidizing species for TC abatement. Mechanistically, cationic vacancies accelerate the >Co(III)/>Co(II) redox cycle, thereby sustaining rapid radical chain propagation. DFT calculations reveal that the cationic vacancies lead to a significant reduction in the adsorption energy of sulfite on the Co 3 O 4 -Vc surface to −1.674 eV, thereby facilitating sulfite adsorption and activation. Bader charge analysis indicates that the amount of electrons transferred from sulfite to Co active sites increases to 0.39 |e|, further accelerating interfacial electron transfer and radical generation. This study suggests that the Co 3 O 4 -Vc/sulfite process can achieve efficient abatement of organic pollutants and exhibit application potential in the practical water treatment.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2024
·
IF 4.2
Hengli Li,Huijun Shang,Feng Pan,Weijun Li,Zhan Du
This article investigated the preparation of ultrafine W powder by fluidized bed hydrogen reduction, and the apparent activation energy was determined for various reduction stages by using temperature programmed reduction with hydrogen. The results demonstrate that the introduction of Co 3 O 4 significantly enhances the reduction process of WO 3 .High Co 3 O 4 content can lead to the formation of CoWO 4 in the initial stage and obtain products with high content of Co 3 W. An increase in the Co 3 O 4 content correlates with a gradual decrease in the particle size of the product. The apparent activation energy for the WO 3 → WO 2 and WO 2 → W processes decreases as the Co 3 O 4 content increases. It can be decreased from 105.59 kJ /mol to 78.72 kJ/mol for the WO 3 → WO 2 stage, and from 107.38 kJ/mol to 78.38 kJ/mol for the WO 2 → W stage, respectively.
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Zhongsen Yan,Binbin Li,Guohui Liu,Zhenyu Lu,Haiqing Chang,Juxiang Jin,Wenxin Dai,Yao Qu,Fangshu Qu
Humic acid (HA), a widely prevalent natural organic matter in aquatic environments, poses serious health risks due to its potential to form carcinogenic by-products during water treatment. While the photo-Fenton process can be employed for HA degradation, its effectiveness is often hindered by the poor catalytic performance of conventional catalysts. In this study, Co 3 O 4 was modified with nitrogen-doped carbon quantum dots (NCDs) and immobilized on a PVDF membrane. Compared with Co 3 O 4 /PVDF, Co 3 O 4 /NCDs/PVDF system achieved 85.1 % HA removal and 66 % mineralization within 60 min through photocatalytic peroxymonosulfate (PMS) activation as well as showed excellent stability in cycle experiments. The incorporation of NCDs enhanced the synergistic effect between light and PMS, improved light absorption due to the narrowed bandgap of Co 3 O 4 /NCDs/PVDF, and played a significant role in generating the primary reactive species, 1 O 2 . Additionally, Co 3 O 4 /NCDs/PVDF effectively controlled Co ions leaching. Finally, the degradation intermediates were identified, and the degradation pathways were proposed. The photo-Fenton degradation of HA preferentially broke unsaturated bonds and degraded aromatic ring compounds. The Co 3 O 4 /NCDs/PVDF photo-Fenton catalytic system serves as an effective approach for boosting the efficiency of photo-Fenton degradation.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Jinfu Ma,Jing Li,Shaolin Yang,Hui Lu,Limeng Liu,Ruipeng Wang
In direct borohydride fuel cell (DBFC), there is a contradiction between catalytic activity and specific discharge capacity (SDC) owing to the dual catalytic effects of most anode catalysts on both borohydride oxidation reaction (BOR) and borohydride hydrolysis reaction (BHR). To overcome this problem, a facile method to fabricate an ultrathin tin dioxide (SnO 2 ) supported cobalt oxide (Co 3 O 4 ) composite material (u-SnO 2 /Co 3 O 4 ) as DBFC anode catalyst was developed. Both catalytic ability for BOR and specific discharge capacity of the DBFC using the u-SnO 2 /Co 3 O 4 (DBFC-u-SnO 2 /Co 3 O 4 ) with 5–10 nm thick two-dimensional (2D) SnO 2 were improved. The maximum power density (52.5 mW cm −2 ) and SDC (1380 mAh g −1 ) of DBFC-u-SnO 2 /Co 3 O 4 were respectively increased by 105% and 1740% in comparison with those of DBFC with Co 3 O 4 as anode catalyst (DBFC-Co 3 O 4 ). The u-SnO 2 /Co 3 O 4 has higher specific surface area, electron donation ability, and the rate of desorption of intermediate product (such as BH 3 OH − , H ads ) which may account for the excellent catalytic performance of u-SnO 2 /Co 3 O 4 for BOR.
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 15
·5930
·
IF 4.6
Xuan Wang,Wei Liang,Changqing Lin,Tie Zhang,Jing Zhang,Nan Sheng,Zhaoning Song,Jie Jiang,Bing Sun,Wei Xu
Propane catalytic oxidation is an important industrial chemical process. However, poor activity is frequently observed for stable C–H bonds, especially for non-noble catalysts in low temperature. Herein, we reported a controlled synthesis of catalyst Co3O4@CeO2–IE via inverse loading and proposed a strategy of oxygen vacancy for its high catalytic oxidation activity, achieving better performance than traditional supported catalyst Co3O4/CeO2–IM, i.e., the T50(temperature at 50% propane conversion) of 217 °C vs. 235 °C and T90(temperature at 90% propane conversion) of 268 °C vs. 348 °C at the propane space velocity of 60,000 mL g−1h−1. Further investigations indicate that there are more enriched oxygen vacancies in Co3O4@CeO2–IE due to the unique preparation method. This work provides an element doping strategy to effectively boost the propane catalytic oxidation performance as well as a bright outlook for efficient environmental catalysts.Keywords:propane catalytic oxidation;inverse loading;oxygen vacancy
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Ruobing Zheng,Yu Yang,Qian Chen,Jie Huan,Lili Zhu,Yuping Sun,Xuebin Zhu
Co 3 O 4 catalysts were grown on ZnO/carbon cloth (CC) by electrodeposition and then the ZnO layer was etched by KOH, and the electrocatalytic water oxygen evolution reaction was investigated. The introduction and etching of ZnO layer can enhance the specific surface area of Co 3 O 4 due to the increased interface between Co 3 O 4 layer and CC as well as the smaller grain size, leading to more active site exposure. Moreover, oxygen vacancies were increased obviously through the above processing, leading to the further improvement in oxygen evolution reaction performance. The porous Co 3 O 4 through ZnO etching was exhibited 337.40 and 385.40 mV at the current density of 10 and 40 mA cm −2 , respectively, and the Tafel slope of porous Co 3 O 4 through ZnO etching is 79.60 mV dec −1 . The results will provide a feasible route to optimize the oxygen evolution reaction performance of Co 3 O 4 catalysts.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2020
·Vol. 33
·期 4
·477-484
·
IF 1.067
Qi Ling-li,Zhong Chun-yan,Deng Zan-hong,Dai Tian-tian,Chang Jun-qing,Wang Shi-mao,Fang Xiao-dong,Meng Gang
In this work, p-type Co 3 O 4 decorated n-type ZnO (Co 3 O 4 /ZnO) nanocomposite was designed with the assistance of bacterial cellulose template. Phase composition, morphology and element distribution were investigated by XRD, SEM, HRTEM, EDS mapping and XPS. Volatile organic compounds (VOCs) sensing measurements indicated a noticeable improvement of response and decrease of working temperature for Co 3 O 4 /ZnO sensor, in comparison with pure ZnO, i.e ., the response towards 100 ppm acetone was 63.7 (at a low working temperature of 180 °C), which was 26 times higher than pure ZnO (response of 2.3 at 240 °C). Excellent VOCs response characteristics could be ascribed to increased surface oxygen vacancy concentration (revealed by defect characterizations), catalytic activity of Co 3 O 4 and the special p-n heterojunction structure, and bacterial cellulose provides a facile template for designing diverse functional heterojunctions for VOCs detection and other applications.
✓ 已验证
DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 12
·6051-6059
·
IF 2.289
Zhang Yanqing,Huang Yanli,Feng Chuanqi,Zhang Yimin,Wu Huimin
In this work, Co 3 O 4 was synthesized by a simple hydrothermal and subsequent calcination treatment for electrochemical detection of H 2 O 2 . In order to improve the electrochemical performance of Co 3 O 4 , it is compounded with the carbon materials derived from cypress leaves, loofah sponge, and pine needles. The electrochemical tests suggested that Co 3 O 4 /loofah sponge-derived carbon showed higher electrochemical activity towards H 2 O 2 than the other two composites. The sensor based on Co 3 O 4 /loofah sponge-derived carbon exhibited a broad linear range from 5.00 μM to 11.40 mM, with a sensitivity of 47.83 μA mM −1 cm −2 and a detection limit of 1.50 μM ( S / N = 3). Thus, this novel nonenzymatic sensor had potential application in H 2 O 2 detection.
✓ 已验证
DOI
高影响因子
Energy & Environmental Materials
·
2024
·
IF 13
Li Zhang,Peiyue Jin,Ze Wu,Bo Zhou,Junchang Jiang,Aomeng Deng,Qiuyue Li,Tanveer Hussain,Yiqiong Zhang,Hanwen Liu,Shuangyin Wang
The electrochemical coupling of biomass oxidation and nitrogen conversion presents a potential strategy for high value-added chemicals and nitrogen cycling. Herein, in this work, CuO/Co 3 O 4 with heterogeneous interface is successfully constructed as a bifunctional catalyst for the electrooxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and the electroreduction of nitrate to ammonia (NH 3 ). The open-circuit potential spontaneous experiment shows that more 5-hydroxymethylfurfural molecules are adsorbed in the Helmholtz layer of the CuO/Co 3 O 4 composite, which certifies that the CuO/Co 3 O 4 heterostructure is conducive to the kinetic adsorption of 5-hydroxymethylfurfural. In situ electrochemical impedance spectroscopy further shows that CuO/Co 3 O 4 has faster reaction kinetics and lower reaction potential in oxygen evolution reaction and 5-hydroxymethylfurfural electrocatalytic oxidation. Moreover, CuO/Co 3 O 4 also has a good reduction effect on NO 3 − $$ {\mathrm{NO}}_3^{-} $$ . The ex-situ Raman spectroscopy shows that under the reduction potential, the metal oxide is reduced, and the generated Cu 2 O can be used as a new active site for the reaction to promote the electrocatalytic conversion of NO 3 − $$ {\mathrm{NO}}_3^{-} $$ to NH 3 synthesis. This work provides valuable guidance for the synthesis of value-added chemicals by 5-hydroxymethylfurfural electrocatalytic oxidation coupled with NO 3 − $$ {\mathrm{NO}}_3^{-} $$ while efficiently producing NH 3 .
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）