JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2021
·
IF 5.279
Danqiu Luo,Xiaohuan Huang,Bangyan Liu,Wenying Zou,Yuangen Wu
The rapid and onsite detection of glyphosate herbicides in agricultural products is still a challenge. Herein, a novel colorimetric nanozyme sheet for the rapid detection of glyphosate has been successfully prepared through the physical adsorption of porous Co3O4 nanoplates on a polyester fiber membrane. Glyphosate can specifically inhibit the peroxidase-mimicking catalytic activity of porous Co3O4 nanoplates, thereby the visual detection of glyphosate can be realized by distinguishing the change in the color intensity of the established nanozyme sheet. The prepared nanozyme sheet has good sensitivity and selectivity, with a detection limit of 0.175 mg·kg–1 for glyphosate detection just by the naked eyes. It can effectively detect glyphosate within 10 min, and the color spots can maintain more than 20 min. The nanozyme sheet is not easily affected by the external environment in detection and storage. The merits of the nanozyme sheet facilitate its practical application in the large-scale preliminary screening of glyphosate residues in agricultural products.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Haoran Pan,Xinning Huang,Zhenjie Lu,Zhiqiang Zhang,Baigang An,Dongling Wu,Tao Wang,Xingxing Chen,Fangyi Cheng
The development of high-performance non-precious bifunctional electrocatalysts for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is urgently needed to realize the commercialization of rechargeable metal-air battery. Herein, we report a ZIF-67 derived hybrid Co-based carbon composite as bifunctional ORR/OER electrocatalyst exhibiting excellent performance and stability in a custom-built Zn-air battery. The catalyst was formed by pyrolytic carbonization of ZIF-67 followed by mild oxidation and sulfurization to a hybrid composite (Co/Co 3 O 4 @CoS-SNC) comprised of multiple active sites including Co-N 4 , Co-N/S-C, C-N/S-C, Co 3 O 4 and CoS, as well as the surface and edge defects in the carbon matrix, that act concertedly yielding a highly efficient bifunctional ORR/OER catalyst for reversible oxygen electrodes. The catalyst affords remarkably low reversible overpotentials and stability not only in a 3-electrode system, but also in a custom-constructed Zn-air battery, exhibiting competitive performance against state-of-the-art bifunctional ORR/OER electrocatalysts reported to date and thus placing it among the best non-precious metal catalysts for reversible oxygen reactions.
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Catalysts
·
2021
·Vol. 11
·期 1
·135
·
IF 4.146
Zhibin Wen,Qianqian Zhu,Jiali Zhou,Shudi Zhao,Jinnan Wang,Aimin Li,Lifang Chen,Weilin Bian
Novel flower-shaped C-dots/Co3O4{111} with dual-reaction centers were constructed to improve the Fenton-like reaction activity and peroxymonosulfate (PMS) conversion to sulfate radicals. Due to the exposure of a high surface area and Co3O4{111} facets, flower-shaped C-dots/Co3O4{111} could provide more Co(II) for PMS activation than traditional spherical Co3O4{110}. Meanwhile, PMS was preferred for adsorption on Co3O4{111} facets because of a high adsorption energy and thereby facilitated the electron transfer from Co(II) to PMS. More importantly, the Co–O–C linkage between C-dots and Co3O4{111} induced the formation of the dual-reaction center, which promoted the production of reactive organic radicals (R•). PMS could be directly reduced to SO4−• by R• over C-dots. On the other hand, electron transferred from R• to Co via Co–O–C linkage could accelerate the redox of Co(II)/(III), avoiding the invalid decomposition of PMS. Thus, C-dots doped on Co3O4{111} improved the PMS conversion rate to SO4−• over the single active site, resulting in high turnover numbers (TONs). In addition, TPR analysis indicated that the optimal content of C-dots doped on Co3O4{111} is 2.5%. More than 99% of antibiotics and dyes were degraded over C-dots/Co3O4{111} within 10 min. Even after six cycles, C-dots/Co3O4{111} still remained a high catalytic activity.Keywords:C-dots/Co3O4{111};dual-reaction centers;enhancement;peroxymonosulfate;conversion to sulfate radical
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Wenjuan Wang,Yan Zhao,Yongguang Zhang,Jiayi Wang,Guoliang Cui,Mingjun Li,Zhumabay Bakenov,Xin Wang
Over the past decade, lithium–sulfur (Li–S) batteries have been thought of as promising alternatives for the new generation of battery systems. Although the Li–S batteries possess high-theoretical energy density (2600 Wh kg–1) and capacity (1675 mAh g–1), the problems of poor electron and ion conduction, volumetric expansion, and sulfur immobilization greatly impede the wide applicability of Li–S batteries. Herein, a defect-rich multishelled Co3O4 microsphere structure doped with Fe was synthesized via a one-step hydrothermal method and subsequent thermal treatment. The unique multishelled structure provides multiple spatial confinements for lithium polysulfides trapping and buffering the volume variation during cycling. Moreover, the rich oxygen defect designed by controlled Fe doping can provide numerous catalytic sites for polysulfide redox reactions. Attributed to the synergistic effect of structural design and oxygen-defect fabrication, the sulfur composite electrode delivers a notable cycle performance, presenting a much lower capacity fading of 0.017% per cycle over 1000 cycles at 1 C and an excellent rate capability of 571.3 mAh g–1 at 5 C. This work proposes a potential approach for designing a transition metal oxide-based multishelled hollow structure combined with oxygen defect, which also offers a new perspective on high-performance Li–S batteries.
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高影响因子
FERROELECTRICS
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2018
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IF 0.728
Tang Wei-qiang,Ren Hui,Jiao Qing-jie
The Co3O4/graphene composite was prepared by a facile one-step method under hydrothermal conditions. During this hydrothermal synthesis process, graphene oxide was reduced to graphene with three-dimensional networks structure and ultra-fine Co3O4 nanoparticles were simultaneously deposited on graphene sheets. The average particle size of the ultra-fine near-spherical Co3O4 nanoparticles on the surface of graphene was in the range of 10–20 nm. The influence of as-prepared composite on the thermal decomposition of ammonium perchlorate show a strong catalytic effect. The decomposition temperature was decreased by 95.2° when adding 3% Co3O4/graphene composite and the low temperature decomposition meanwhile disappeared.
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Nano Research
·
2018
·Vol. 11
·期 3
·1490-1499
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IF 7.994
Du Haoran,Huang Kuangfu,Li Min,Xia Yuanyuan,Sun Yixuan,Yu Mengkang,Geng Baoyou
Porous hollow Co 3 O 4 microspheres have been synthesized from a mixed cobalt nitrate and urea solution through spray pyrolysis followed by calcination at 600 °C in air. This porous hollow Co 3 O 4 is assembled by nanoparticles and exhibits variable porosity depending on the amount of gas in the system. In pyrolysis process, urea continuously decomposes into gaseous components, which act as a template to control the porous structure. The amount of gas escaping from precursor droplets can directly influence the porosity of the microspheres and the size of the nanoparticles controlled by the ratio of urea to cobalt nitrate. Electrochemical measurements show that the performance of the porous hollow Co 3 O 4 microspheres is related to the porosity and size of the nanoparticles. The sample with optimal porosity delivers a high first charge capacity of 1,417.9 mAh·g −1 at 0.2C (1C = 890 mA·g −1 ), and superior charge cycle performance of 1,012.7 mAh·g −1 after 100 cycles. In addition, the optimized material displays satisfactory rate performance of 1,012.4 mAh·g −1 at 1C after 50 cycles and 881.3 mAh·g −1 at 2C after 300 cycles. Superior charge/discharge capacity, excellent rate performance and high yield achieved in this study is promising for the development of high-performance Co 3 O 4 anode materials for lithium-ion batteries.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Xiaowei Li,Jianmin Gou,Lili Bo,Tian Fang,Chengzhuo Li,Jiangping Ma,Xiaolin Guan,Jinhui Tong
The development of highly efficient non-precious electrocatalysts for the oxygen evolution reaction (OER) remains a significant challenge. In this work, we introduce a highly effective OER electrocatalyst, Cu-F-Co 3 O 4 , synthesized by doping copper (Cu) and fluorine (F) into Co 3 O 4 using a quenching method. Both experimental and theoretical calculations reveal that Cu and F incorporation significantly shifts the d-band center closer to the Fermi level, creates abundant oxygen vacancies, and facilitates the reconstruction of the catalyst to form the CuCo 2 O 4-y F y /CuO heterojunction. This structural modification enhances the OER performance of the catalyst. Additionally, the multi-dimensional architecture exposes more active sites and accelerates mass and charge transfer kinetics. The optimal catalyst, Cu-F-Co 3 O 4 -0.7, demonstrates a low overpotential of 290 mV at 10 mA·cm −2 , along with remarkable stability exceeding 100 h, significantly outperforming both pristine Co 3 O 4 and benchmark RuO 2 electrocatalysts. These findings offer new insights into activating surface reconstruction in spinel oxides by engineering both anion and cation defects for water oxidation.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Minghu Zhao,Jiuhu Zhao,Ran Ding,Rongshu Zhu,Haiyan Li,Zhi Li,Jingwen Zhang,Yongji Zhu,Huiying Li
The existence of sulfur dioxide and water vapor in the flue gas generated from waste-to-energy stations could lead to catalyst deactivation , which has adverse effects on NO x removal. It is thus particularly important to study the reaction mechanism of catalyst resistance to poisoning. Herein, we report the mechanism of In-Co 3 O 4 -Ga 2 O 3 /H-Beta catalyst to SO 2 and H 2 O resistance in the selective catalytic reduction (SCR) of NO x by CH 4 . The catalyst could achieve 74.6% NO x removal efficiency in the presence of 100 ppm SO 2 and 5% H 2 O. In this catalyst, Co 3 O 4 is attributed to enhancing the reversible poisoning of SO 2 and CH 4 activation and increasing the number of Brønsted acid sites by decomposing H 2 O. However, the InO + active center was still eroded by a small amount of water vapor, leading to a reduction in NO x removal efficiency. The addition of Ga 2 O 3 primarily provided an important intermediate NO 2 for CH 4 -SCR reaction and reduced the aggregates of Co 3 O 4 to increase the exposure of indium sites, and could reduce a part of SO 2 to S 2− . This study provides a good candidate for preparing catalysts with superior resistance towards SO 2 and H 2 O for CH 4 -SCR.
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高影响因子
NANOTECHNOLOGY
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2021
·Vol. 32
·期 34
·345702
·
IF 3.874
Yuqiang Zhang,Yan Wang,Jiahui Zhu,Xubin Zhang,Wangfeng Cai
A flower-like structured electrode material of Co3O4@Ni–Co layered double hydroxide (LDH) grown on Ni foam (Co3O4@Ni–Co LDH/NF) was prepared via an in situ growth, annealing and electrodeposition process. The Co3O4@Ni–Co LDH/NF electrode was prepared with the optimized conditions of annealing temperature 300 °C, deposition time 20 min and Ni/Co ratio 1:1. The results showed that the as-prepared electrode material exhibited an excellent specific capacitance and great cycling stability. Furthermore, an quasi-solid-state supercapacitor was assembled using the prepared Co3O4@Ni–Co LDH/NF as the positive electrode and activated carbon on Ni foam (AC/NF) as the negative electrode. The as-assembled device presented a high energy density and power density.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Lixin Sun,Yunong Qin,Lishan Fu,Yutong Di,Kaidi Hu,Hailong Li,Ling Li,Wenming Zhang
Secondary zinc-air batteries (ZABs) with a free-standing and flexible air electrode integrated with distinguished bifunctional oxygen electrocatalysts are crucial for achieving better performance. Herein, benefitting from the rational design and simple synthesis, a highly controlled design can be achieved for the first showing of the synthesis of Co 3 O 4 /Fe 2 O 3 NAs@CNFs with a unique hierarchical nanostructure , consisting of randomly distributed zero-dimensional (0D) Co 3 O 4 /Fe 2 O 3 nanoparticles embedded in two-dimensional (2D) MOF derived nitrogen-doped mesoporous carbon flake nanoarrays grown on three-dimensional (3D) microporous network with interconnected conductive one-dimensional (1D) carbon nanofibers from carbonized electrospinning polymer nanofiber film (PMNFs). Under the synergy of 3D hierarchical porous nanostructure and abundant accessible active sites, Co 3 O 4 /Fe 2 O 3 NAs@CNFs is endowed with excellent bifunctional electrocatalytic activities like those of commercial Pt/C and RuO 2 , respectively. Rechargeable aqueous ZABs based on Co 3 O 4 /Fe 2 O 3 NAs@CNFs as air electrodes outperform their counterparts based on Pt/C and RuO 2 loaded carbon nanofibers (CNFs) as air electrodes, with a maximum power density of 246 mW cm −2 and excellent cycling stability with no increased polarization even after 40 h. And the assembled flexible solid-state ZABs with Co 3 O 4 /Fe 2 O 3 NAs@CNFs also display superior performance and bendability.
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高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Cong Zhang,Jujie Ren,Yifei Xing,Min Cui,Na Li,Peng Liu,Xiaofang Wen,Meng Li
In this work, PdNPs@ZnO-Co 3 O 4 was synthesized via the facile oxidation treatment of bimetallic ZnCo-zeolitic-imidazolate-framework (ZnCo-ZIF) followed by in situ chemical reduction of PdNPs on the surface of the nanocrystals. After combined with MWCNTs, the PdNPs@ZnO-Co 3 O 4 -MWCNTs nanocomposites were formed, which were then exploited as novel electrode materials to construct the non-enzyme electrochemical sensors for high-sensitivity detection of tanshinol. Due to the high catalytic activity of multi-metallic PdNPs@ZnO-Co 3 O 4 , and the excellent charge transfer property between imidazole groups of the ligands in MOFs and MWCNTs, the obtained sensor exhibited high sensitivity for tanshinol detection under optimum experimental conditions. The sensor shows two well linear relationship between the current and tanshinol concentration in the range of 0.002–0.69 mM (R 2 = 0.989) and 0.69–3.75 mM (R 2 = 0.994) with the corresponding sensitivity of 59.16 μA mM − 1 and 19.08 μA mM − 1 . And the limit of detection (LOD) was calculated to be 0.019 μM (S/N = 3). Furthermore, with the advantages of good repeatability, stability and selectivity, the fabricated sensor can be successfully applied to measurement of tanshinol in real medicinal liquids samples. Our results would accelerate the applications of MOFs in electrochemical field and provide insights into design of multifunctional non-enzyme sensing materials for various applications in biocatalysis, bioanalysis and drug testing.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yonglong Huang,Zhengkang Duan,Chuan Li,Tian Qiu
The catalytic dehydrogenation of diethanolamine to prepare iminodiacetic acid has attracted considerable research interest. However, the lack of understanding of the structure-activity relationship of the reaction can present a challenge to the control of the catalytic behavior. Concurrently, improving the catalytic performance and reducing the cost have also become urgent issues that require resolution. This work examined the catalytic mechanism of several Cu-Ni X /ZrO 2 catalysts, differing in Cu/Ni ratios, prepared by H 2 reduction, in the context of DEA dehydrogenation to elucidate the structure-activity connection and probable reaction mechanism. Subsequently, a strategy has been put out to generate metal (Ni and Co)-doped copper-zirconium catalysts using the co-precipitation-hydrazine hydrate reduction process. The synergistic effect between metals was combined with the improvement of the surface reaction of the catalyst by hydrazine hydrate through a more efficient preparation method, thereby enhancing the catalyst's overall performance. The representative catalyst Cu-Ni/ZrO 2 required a hydrazine hydrate reduction temperature and time of 40 °C and 30 min, and after 65 min of reaction, it exhibited a high conversion rate (96.3 %) and yield (93.7 %), and after five cycles, both the conversion rate and yield exceeded 85 %. Various characterization techniques have confirmed that Ni doping induced an alloying effect and a size effect. Additionally, the hydrazine hydrate reduction method was discovered to augment the specific surface area, surface hydroxyl groups, hydrophilicity, and optimize the pore size distribution of the catalyst while also regularizing its morphology, thereby significantly enhancing the activity and stability of the metal-doped copper-zirconium catalyst. This paper discussed the correlation between catalyst structure and reaction performance, as well as the catalytic conversion mechanism, which is anticipated to provide a novel reference for the preparation, performance control, and potential applications of dehydrogenation catalysts.
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