JOURNAL OF POWER SOURCES
·
2013
·
IF 4.675
Bin Zhang,Yibo Zhang,Zhenzhen Miao,Tianxiao Wu,Zhendong Zhang,Xiangguang Yang
Two kinds of Co 3 O 4 samples with micro/nano-structure as high capacity anode materials for Lithium-ion Batteries are synthesized by a facile method. The structure, composition and surface morphology are analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM), respectively. The XRD data indicates that the two Co 3 O 4 materials are crystalline, single-phase without any impurity phase; the size of spheres and cubes are estimated to be 2 μm and the nanoparticles are around 100 nm. The cyclic voltammetry and discharge/charge measurements are carried out to detect the electrochemical properties . The results demonstrate that the two Co 3 O 4 electrodes with micro/nano-structure exhibit low initial irreversible capacity and superior cycling performance. The two Co 3 O 4 materials with micro/nano-structure are confirmed to combine the advantages of the micro-materials and nano-materials for LIBs. Moreover, the Co 3 O 4 spheres (s-Co 3 O 4 ) exhibit more superior cycling performance than that of Co 3 O 4 cubes (c-Co 3 O 4 ) due to the larger void volume in spheres than that in cubes structure.
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高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 23
·7161-7170
·
IF 6.177
Kaiyuan Hu,Jia Li,Yang Han,Dickon H. L. Ng,Ningning Xing,Yangsai Lyu
Micromotors have great potential in environmental monitoring and treatment. Herein, ZIF-67 derived Co3O4–CeO2 micromotors with a porous nanocage structure were synthesized by the ingenious combination of template scarification and calcination methods. Co3O4 inherited the typical porous structure of the ZIF-67 precursor and its skeleton offered a substrate for uniform in situ growth of CeO2 nanoparticles. The ZIF-67 derived Co3O4–CeO2 revealed a unique nanocage structure with a broken corner, resulting in the autonomous movement in the presence of H2O2. Based on the combination of peroxide-like activity, self-propelled motion and photo-Fenton like performance, a strategy to selectively and sensitively detect and quickly remove hydroquinone (HQ) from water was established. Taken together, this novel Co3O4–CeO2 nanocage-based micromotor could be effectively harnessed for water treatment.
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高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Shijian Zhou,Chunxia Liu,Weiming Jin,Lingling Pan,Qichao Jiang,Yingjie Hu,Yan Kong
Noble-metal nanoparticles (NPs), due to their high surface energy, suffer from serious problems, such as ease of agglomeration at high temperatures, which unfortunately causes a significant decline in their original catalytic activity during the reaction and recycling processes. To solve these problems, in this work, a multiple-step synthetic method is proposed to construct an advanced core–shell structure by anchoring ultrasmall Au nanoparticles on the inner surface of mesoporous Co3O4 (m-Co3O4). The m-Co3O4, which has a high surface area, is fabricated by a hard-templating method, and the ultrasmall Au NPs (1.9 nm) are confined to the inner surface of the m-Co3O4. The target sample of Au–m-Co3O4 is found to achieve the highest catalytic efficiency in the probe reaction of the catalytic reduction of 4-nitrophenol to 4-aminophenol, and more importantly, thermal stability tests demonstrate that the Au–m-Co3O4 catalyst is more stable at higher temperatures. Furthermore, DFT calculations have verified that both activated hydrogen adsorption and 4-aminophenol desorption are significantly promoted on the surface of the Au–m-Co3O4 catalyst due to a strong synergetic effect between Au and the m-Co3O4. The construction of this advanced architecture for Au-based catalysts could provide a facile method for stabilizing ultrasmall noble-metal NPs and reasonably designing noble-metal catalysts with desirable activity and stability.
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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.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhichao Shang,Man Zhang,Jingjing Qu,Sanjith Udayakumar,Xintan Bai,Xiaohong Wang,Baojing Zhang,Jianzhong Wang,Farshid Pahlevani,Peizhong Feng
Chemical/electrochemical dealloying was applied to porous CoAl intermetallic (IMC) precursors synthesized via a rapid thermal explosion (TE) method, producing Co 3 O 4 (O V ) self-supported materials with rod-like, nano-flower, and honeycomb-like nanostructures. The investigation thoroughly explored the phase composition, exothermic behavior, precursor morphology, electrochemical characteristics of the dealloyed products, and the mechanism of oxygen vacancies that influence the performance of supercapacitors. The diffusion of intermediate phases governs the exothermic behavior and structural integrity of the CoAl IMC precursors, formatting a precursor with a porous material featuring a 3D microstructure. The effect of dealloying time, temperature and, applied potential on the nanostructure of the sample was examined, ultimately enabling the controlled synthesis of nano-flower Co 3 O 4 (O V ) in the dealloying process. The synthesized self-supported Co 3 O 4 (O V ) materials with a relatively high concentration of oxygen vacancies and a high specific surface area (36.69 m²/g). The materials showed high capacitance (11.25 F/cm 2 at 10 mA/cm 2 ) and exceptional cyclic stability (the decay rate per cycle is 0.013 % at 20 mA/cm 2 after 2000 cycles). DFT simulations demonstrated that the O V creates additional unsaturated coordination sites, enhancing the storage capacity by facilitating ion insertion and extraction, thus significantly boosting the specific capacity.
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高影响因子
Journal of Biomedical Nanotechnology
·
2022
·Vol. 18
·期 6
·1585-1595
·
IF 3.641
Chen Ben-Qi,Yang Meng,Liao Wen-Chun,Li Zi-Ying,Chen Zhi-Xiong,Yang Yun-Hui,Yang Tong,Hu Rong
Developing a strategy for the determination of trace ochratoxin A (OTA) in food is very important to ensure food safety. Here, based on a tripod probe, an electrochemical aptasensing platform for detected OTA sensitively was designed, which used the 3D DNA walker by endonuclease Nb.BbvCI
powered and the nanozyme of porous Co3O4 nanodisks loaded Pt nanoparticles (Pt NPs@Co3O4) as a cascaded signal amplifying device. With OTA as a model target, the swing-arm probe of DNA walker was triggered. Next, probe on the magnetic beads was cleaved
and released by Nb.BbvCI to realize the first signal amplification. After that, the partial sequence of the released probe is well assembled with triple-strand DNA by strand reaction and the other sequence exposed as a capture probe was combined with the Pt NPs@Co3O4.
It can efficiently make the decomposition of H2O2, bring about significant current, and the signal was amplified again. The designed electrochemical aptasensor demonstrated outstanding detection linearity in the OTA concentration range of 1 pg/mL to 100 ng/mL, with a
detection limit of 0.194 pg/mL (S/N = 3), with excellent reproducibility and high specificity. It can be used to find OTA in food. This research supplies a potential split-new avenue for the sensitive detection of electrochemical aptasensor.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Jinping Zhong,Yikui Zeng,Dongdong Chen,Shengpeng Mo,Mingyuan Zhang,Mingli Fu,Junliang Wu,Zixue Su,Peirong Chen,Daiqi Ye
Series of Co 3+ -rich spinel Co 3 O 4 catalysts were synthesized and evaluated by toluene catalytic oxidation. An outstanding activity was achieved over Co 3 O 4 -N utilizing Co(NO 3 ) 2 ·6H 2 O as precursor (T 50 = 211 °C, T 90 = 217 °C at conditions: 1000 ppm(v), WHSV = 60 000 mL g −1 h −1 ). Results of comparative characterizations demonstrated that such excellent performance was mainly attributed to large surface area, high reducibility at low temperature, high abundance of Co 3+ ions and structure defects, as well as highly active surface oxygen. The results of in situ DRIFTS revealed that in the air or N 2 atmosphere, the by-products were almost the same. The reaction pathway of toluene oxidation can be described as follow: transformation of toluene from benzyl alcohol, benzaldehyde, benzoate, benzene, phenol, benzoquinone, maleic acid and to final products, which were fully confirmed by PTR-TOF-MS. Besides, ring opened by-products, such as acetone, acetic acid, acetaldehyde, etc. were also detected. In this work, the combination of in situ DRIFTS and PTR-TOF-MS provided a promising approach for further understanding of the mechanism of VOCs elimination.
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zi-Ang Li,Sheng-Guang Wang,Pei-Pei Chen,Jia-Ting Lei,Yun-Lei Hou,Jing-Zhou Chen,Dong-Lin Zhao
Metal–organic framework materials can be converted into carbon-based nanoporous materials by pyrolysis, which have a wide range of applications in energy storage. Here, we design special interface engineering to combine the carbon skeleton and nitrogen-doped carbon nanotubes (CNTs) with the transition metal compounds (TMCs) well, which mitigates the bulk effect of the TMCs and improves the conductivity of the electrodes. Zeolitic imidazolate framework-67 is used as a precursor to form a carbon skeleton and a large number of nitrogen-doped CNTs by pyrolysis followed by the in situ formation of Co3O4 and CoS2, and finally, Co3O4@CNTs and CoS2@CNTs are synthesized. The obtained anode electrodes exhibit a long cycle life and high-rate properties. In lithium-ion batteries (LIBs), Co3O4@CNTs have a high capacity of 581 mAh g–1 at a high current of 5 A g–1, and their reversible capacity is still 1037.6 mAh g–1 after 200 cycles at 1 A g–1. In sodium-ion batteries (SIBs), CoS2@CNTs have a capacity of 859.9 mAh g–1 at 0.1 A g–1 and can be retained at 801.2 mAh g–1 after 50 cycles. The unique interface engineering and excellent electrochemical properties make them ideal anode materials for high-rate, long-life LIBs and SIBs.
研究领域:
材料科学
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储能
·
电化学
·
纳米材料
·
电池技术
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Guanhan Chen,Hongjie Wang,Wenyi Dong,Wenhui Ding,Feifei Wang,Zilong Zhao,Yuxiong Huang
Cobalt oxide (Co 3 O 4 ) activated peroxymonosulfate (PMS) system was extensively studied due to its excellent catalytic performance. However, the relatively high cobalt (Co 2+ ) leaching (up to 2 mg/L) would pose high ecotoxicological risks. Herein, we identified the existence of Co(OH) 2 on the surface of Co 3 O 4 were the major source of Co 2+ leaching in the Co 3 O 4 activated PMS system. Furthermore, the Co 2+ leaching was effectively suppressed by converting Co(OH) 2 to Co 3 O 4 via pyrolysis treatment. In addition, reduced graphene oxide (rGO) was engaged to enhance the degradation performance of antibiotics in the Co 3 O 4 activated PMS system. The oxygen functionalities of rGO would catalyze PMS to generate sulfate radicals (SO 4 − ) and trigger the non-radical pathway of singlet oxygen ( 1 O 2 ). We have achieved outstanding catalytic performance for carbamazepine (CAZ) degradation with low Co 2+ leaching, as CAZ (5 mg/L) could be completely degraded in 30 min. Combining experimental investigation and theoretical calculation, we also revealed the degradation pathways and mechanisms that CAZ would be oxidized and detoxified by 1 O 2 and SO 4 − . We have provided a simple approach to inhibit the Co 2+ leaching and enhance the catalytic performance of Co 3 O 4 activated PMS system for the effective control of antibiotics.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
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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高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
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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DOI
PubMed
高影响因子
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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高影响因子
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