OPTICAL MATERIALS
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2020
·
IF 2.779
Zhe Zhang,Jihui Lang,Zhong Hua,Yuxin Song,Si Wu,Qi Zhang,Ming Gao,Jingshu Wang,Maobin Wei,Jinghai Yang,Dandan Wang
We report on a new type of nitrogen-doped porous carbon@Co 3 O 4 catalysts, demonstrating high-efficiency for tetracycline (TC) degradation, are synthesized via two steps of simple grinding and calcination treatment. The temperatures of carbonization and oxidation play an important role in determining the structure, morphology, chemical composition and catalytic performance of the catalysts. The C-700-300 catalyst with 3D porous structure demonstrates the best catalytic performance for TC degradation due to the large amount of graphitized nitrogen, large specific surface area and small particle size. The effect of catalyst and peroxymonosulfate (PMS) amount on the catalytic performance are also fully investigated. The mechanism of catalysts to PMS activation for TC degradation is elaborated, which is ascribed to the radical and non-radical pathways. The sulfate radical function in TC degradation from the radical quenching experiment and the non-radical pathway is also discussed to complement the above degradation due to the excessive electron donors in catalysts.
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高影响因子
ELECTROCHIMICA ACTA
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2020
·
IF 6.215
Mingjie Sun,Shuai Guo,Ziling Wang,Lu Zou,Bo Chi,Jian Pu,Jian Li
It is crucial to design effective cathode catalysts for high performance of Li–O 2 batteries (LOBs). Herein, porous LaCo 0.6 Ni 0.4 O 3 nanofibers decorated with ultrafine Co 3 O 4 nanoparticles (Co 3 O 4 @LCN NFs) are designed and employed as cathode catalyst for LOBs. The X-ray photoelectron spectroscopy measurement results suggested that uniform dispreading of Co 3 O 4 nanoparticles on LCN NFs surface could largely increase the surface chemisorbed oxygen, resulting in enhanced catalytic activity. Furthermore, with the assistance of Co 3 O 4 nanoparticles, Co 3 O 4 @LCN NFs can significantly facilitate O 2 adsorption and diffusion, Li 2 O 2 nucleation/decomposition and the formation of tiny sheet-like Li 2 O 2 , thereby achieving a low charge overpotential. A high specific capacity of 11,288 mA h g −1 , a low charge voltage plateau of 3.72 V at first cycle and excellent cycle stability of 116 cycles at 1000 mA g −1 are obtained for LOBs with Co 3 O 4 @LCN NFs.
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高影响因子
Materials Chemistry Frontiers
·
2020
·Vol. 5
·期 1
·259-267
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IF 6.788
Hang Yang,Hui Sun,Xiaochen Fan,Xiaozhong Wang,Qingfeng Yang,Xiaoyong Lai
Rational design and preparation of advanced electrocatalysts for the oxygen evolution reaction (OER) are highly desirable, where various strategies have been applied to enhance the electrocatalytic activities, such as developing nanostructures, facet control, and creating oxygen vacancies. Herein, we have successfully integrated multiple strategies into one catalytic system for further enhancing the OER performance. A series of hollow Co3O4 dodecahedrons with controlled crystal orientation and oxygen vacancies were prepared by using ZIF-67 as a precursor and adjusting the atmosphere during calcination. Hollow Co3O4 dodecahedrons with both controlled exposure of the (111) facets and high content of oxygen vacancies showed an excellent OER performance with an overpotential of 307 mV at 10 mA cm−2 and a Tafel slope as low as 55 mV dec−1 and significantly superior to its counterpart with low content of oxygen vacancies or a broken Co3O4 dodecahedron being ground and losing the preferred facets of (111). The excellent OER performance should be attributed to the unique hollow structure and the effective control of the (111) facets and oxygen vacancies, which allows for more highly active sites and enhanced conductivity.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 13
·5445-5457
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IF 3.553
Zhang Xinmeng,Mao Zixuan,Zhao Yuanxiao,Wu Yuanting,Liu Changqing,Wang Xiufeng
Co 3 O 4 is often used to detect H 2 O 2 . However, there are many problems such as low sensitivity and the long detection time when detecting H 2 O 2 in various cobalt oxide composites. Therefore, it is a great challenge to develop different morphologies of the Co 3 O 4 electrode to improve the detection performances of H 2 O 2 effectively. In this paper, we had successfully prepared a novel Co 3 O 4 /reduced graphene oxide/carbon cloth (Co 3 O 4 /rGO/CC) composite. We used a simple template method. Co 3 O 4 nanosheets with a diameter of about 47.7 nm were obtained by using graphene oxide as a template. Then, CC was used as a three-dimensional conductive support material. CC can inhibit the agglomeration of rGO to increase specific surface area and to enhance the conductivity of Co 3 O 4 . In this study, the electrochemical performances of the Co 3 O 4 /rGO/CC electrode were tested by the electrochemical workstation. The trigger response of the modified electrode was reduced by 0.067% and the relative standard deviation was 0.013% after 30 consecutive tests. The range of linearity was 0.387–63.523 mM. Besides, this electrode has the limit of detection (0.022 μM) and a higher sensitivity (0.9683 mA mM −1 cm −2 ). It indicated that the electrode has excellent electrochemical sensing performance and high stability. These excellent performances are mainly due to the synergistic effect of Co 3 O 4 nanosheets, rGO, and CC.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Wei Fang,Jinghuan Chen,Xiangyuan Zhou,Jianjun Chen,Zhiping Ye,Junhua Li
In this work, a core–shell structured CeO2@Co3O4 catalyst was successfully prepared by using a zeolitic imidazolate framework-based material as a sacrificial template. The structure, morphology, and physicochemical characteristics of these materials were investigated by X-ray diffraction, N2 sorption, Fourier transform infrared spectroscopy, Raman spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, temperature-programmed desorption, and temperature-programmed reduction studies. Compared with pure Co3O4 and CeO2, the CeO2@Co3O4 sample displayed superior catalytic performance (T90 = 225 °C) toward toluene oxidation. Results demonstrated that the CeO2@Co3O4 sample exhibited a core–shell structure, with hierarchically wrinkled surfaces. This unique structure, especially the interface between the core and the shell, endowed the CeO2@Co3O4 catalyst with better activity. In addition, there was a synergistic effect between cerium and cobalt oxides in the core–shell bimetallic sample, which was responsible for the improved performance of the material. Moreover, surface-active oxygen species involved and played a significant role in toluene oxidation.
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Energy Technology
·
2020
·Vol. 8
·期 5
·1901310
·
IF 3.404
Muhammad Sohail Riaz,Siwei Zhao,Chenlong Dong,Muhammad Javed Iqbal,Yantao Zhao,Fuqiang Huang
Heterostructure transition metal derivatives have been extensively studied in electrocatalysis, but most of the hybrid samples are on nanoscale with low stability and tap density. ZnO microspheres are applied as a sacrificial template, followed by alkaline etching and aluminum reduction to construct Ni/Co 3 O 4 microcubes. The porous hybrid microcubes show stirring performance in both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). For HER, it exhibits comparable overpotential of 145 mV at 10 mA cm −2 as Pt/C (101 mV) and desirable stability. For OER, it outperforms RuO 2 with lower overpotential when the current exceeds 17.8 mA cm −2 and much smaller Tafel slope of 34 mV dec −1 versus RuO 2 (72 mV dec −1 ). The potential activity is assigned to the charge transfer at the heterointerfaces, and the synergic effects of the Ni/Co 3 O 4 phases, which possibly will cast light on the design of microscale bifunctional electrocatalysts.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Jiang Zhao,Caidong Zheng,Jing Gao,Jiahao Gui,Licheng Deng,Yanyan Wang,Rongqing Xu
Developing flexible and wearable enzyme-free biosensors for detecting glucose is indispensable for preliminary diabetes diagnosis and human healthcare monitoring. Herein, an innovative flexible Co 3 O 4 nanoparticles uniformly embedded in 3D porous laser-induced graphene (Co 3 O 4 NPs-LIG) electrode is fabricated by a new one-step laser direct writing carbonization technique. The hybrid electrode featuring the remarkable synergistic effect on account of the excellently conductive LIG and multiple high activation sites of Co 3 O 4 NPs can enhance charge transfer, thereby boosting glucose sensing performance. Benefit from the dramatic properties, the proposed flexible non-enzymatic glucose biosensor exhibits a prominent glucose sensitivity of 214 μA mM –1 cm –2 , an extremely low limit of detection of 0.41 μM, a wide linear detection of 1 μM to −9 mM, and a fast response time within 0.49 s. Additionally, impressive repeatability, favorable stability, and great selectivity are achieved in the detection of glucose concentration . Finally, a possible sensing mechanism of the glucose biosensor is also discussed based on the First principles. This study provides a novel and facile strategy for constructing heterostructure of transition metal oxide NPs embedded in LIG, which serves to develop flexible and wearable highly sensitive enzyme-free biosensors for detecting glucose in the near future.
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Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Rong Ji,Menghan Zhang,Wei Ma,Zhi Zhu,Changchang Ma,Pengwei Huo,Yongsheng Yan,Yang liu,Chunxiang Li
A new heterojunction photocatalyst of MoS 2 /Co 3 O 4 was synthesized for degrading water organic pollutants firstly. The heterojunction photocatalyst contains small Co 3 O 4 nanoparticles deposited on the surface of MoS 2 nanosheets. The MoS 2 /Co 3 O 4 heterojunction exhibits superior degradation efficiency than pure MoS 2 and Co 3 O 4 for removing 2-mercaptobenzothiazole (MBT) and tetracycline (TC) under visible light. The high degradation efficiency mainly stem from creating heterojunction between MoS 2 and Co 3 O 4 . The uniform particle size of Co 3 O 4 and the better interfacial interaction of MoS 2 and Co 3 O 4 enhance the surface of heterojunction and inhibiting electron-hole pairs recombination. In addition, deep insight in mechanism suggests that holes and superoxide radicals are the major active species in the MBT and TC removal procedures. This present work may provide a promising approach to fabricate other transition metal heterojunction with efficient photocatalytic activity.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 14
·8327-8334
·
IF 10.733
Huanhuan Duan,Li Du,Shenkui Zhang,Zhuowen Chen,Songping Wu
Transition metal oxides have shown extraordinary potential for lithium storage to date. Herein, a peony-like holey Co3O4 architecture has been elaborately designed and successfully prepared via a solvothermal process followed by annealing treatment. The as-obtained peony-like Co3O4 material showed an ultra-large reversible capacity of 1880 mA h g−1 at 500 mA g−1 after 800 cycles when it acted as the anode. More importantly, it also afforded a remarkable high-rate capability, i.e., an excellent capacity of 1141 mA h g−1 at a current density of 10 A g−1. Such an impressive performance could be ascribed to improved kinetics originating from ultrathin 2D nanosheets with ample pores and a high pseudocapacitive contribution. Therefore, the peony-like Co3O4 material was considered as a promising candidate for high-performance Li-ion battery anodes.
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ANALYST
·
2019
·Vol. 144
·期 18
·5455-5461
·
IF 4.019
Wei Shi,Shuang E,Meng-Meng Wang,Tian-Ze Li,Ting Yang,Shao-Rong Liu,Ming-Li Chen,Jian-Hua Wang
Over the past few years, artificial enzymes have attracted enormous attention due to their high stabilities and cost-effective productions. In this work, metal–organic framework-derived SiW12@Co3O4 was synthesized in large quantities by stirring the mixture at ambient temperature and calcination. The obtained SiW12@Co3O4 exhibited a highly inherent peroxidase-like activity and excellent stability. Kinetic studies demonstrated that the synthesized SiW12@Co3O4 had a strong binding affinity to 3,3′,5,5′-tetramethylbenzidine (TMB), stronger than HRP had. Specifically, the peroxidase-like activity of SiW12@Co3O4 in an aqueous solution was well maintained after incubation at an elevated temperature, at an extreme pH and for a long time. A SiW12@Co3O4-based method was further developed for H2O2 and one-pot glucose detection with good sensitivity and reliability. The facile synthesis approach is expected to facilitate the practical use of metal–organic frameworks and their derivatives as enzyme mimics in the future.
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PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Wenbin Liu,Yuanyuan Fu,Yanfei Li,Shouhui Chen,Yonghai Song,Li Wang
Three-dimensional (3D) carbon foams (CF) surrounded by carbon nanotubes (CNTs) and Co-Co 3 O 4 nanoparticles (NPs) (CF@Co-Co 3 O 4 /CNT) nanocomposites were prepared by a two-step method for stable lithium-ion batteries (LIBs). The low-cost melamine foams pre-soaked in cobalt nitrate solution were firstly carbonized under nitrogen atmosphere to form 3D CF surrounded by a large number of CNTs and Co NPs (CF@Co/CNT). Subsequently, the CF@Co/CNT was transformed into CF@Co-Co 3 O 4 /CNT nanocomposites by calcination in air. Here, Co NPs, CNT and 3D CF all improved the electrical conductivity of CF@Co-Co 3 O 4 /CNT nanocomposites. In addition, a large number of uniformly-dispersed small Co 3 O 4 NPs effectively increased Li + storage capacity of nanocomposites. At the same time, the 3D macroporous carbon frameworks surrounded by CNT could also relieve the volume deformation of Co 3 O 4 NPs to some extent. When it was employed as anode materials for LIBs, CF@Co-Co 3 O 4 /CNT nanocomposites exhibited the stable reversible capacities of about 500 mAh g −1 at 0.5 A g −1 , larger than that of commercial graphite and some other Co-based materials. The two-step preparation method was simple and convenient for large-scale production.
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 13
·11117-11123
·
IF 3.201
Jiali Zhang,Fangwei Zhang,Shouwu Guo,Jingyan Zhang
A three-dimensional composite of Co3O4 nanoparticles and nitrogen-doped reduced graphene oxide (3D Co3O4/N-rGO) with a unique 3D porous structure was prepared, and its catalytic activity in lignin model compound oxidation was explored. The 3D Co3O4/N-rGO composite exhibits improved catalytic performance as compared to Co3O4 nanoparticles or 3D N-rGO in the oxidation of lignin model compounds. The higher catalytic activity of the 3D Co3O4/N-rGO composite is attributed to the combination of its porous structural features, large surface area that is provided by the 3D N-rGO matrix, and active Co3O4 nanoparticles doped on the N-rGO surface. The structural features of the 3D Co3O4/N-rGO are beneficial to reactant and product diffusion and transportation, and also are helpful in preventing aggregation of Co3O4 nanoparticles. In addition, the introduction of N atoms in rGO is also favorable for the formation of active oxygen species for the oxidation of model compounds. Given the high activity and the easy recovery from the reaction system, the 3D Co3O4/N-rGO composite should be applicable to non-noble metal catalytic systems for lignin model compounds.
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