APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Weiming Xiang,Qiuyi Ji,Chenmin Xu,Yang Guo,Yazi Liu,Dunyu Sun,Wenwu Zhou,Zhe Xu,Chengdu Qi,Shaogui Yang,Shiyin Li,Cheng Sun,Huan He
A novel Co 3 O 4 /g-C 3 N 4 /Bi 2 O 2 CO 3 (BCCN) photocatalyst with p-n/n-n heterojunction was synthesized through a solvent-thermal method. The degradation efficiency of 20 mg/L iohexol reached 94 % in 60 min ( k app =0.0417 min −1 ) in BCCN/light/PS system, which was 2.8 and 6.5 times higher than systems of BCCN/light ( k app =0.0150 min −1 ) and BCCN/PS ( k app =0.0064 min −1 ). The g-C 3 N 4 addition lowered conduction band of the prepared material to produce superoxide radicals, activate persulfate and further prevent the recombination of photoelectrons and holes. Superoxide radicals and singlet oxygens were dominant radicals for iohexol degradation. Besides, persulfate could act as electron acceptor to enhance efficiency of electron transfer. The interaction between sulfate, superoxide and hydroxyl radicals improved singlet oxygens production. Furthermore, theoretical calculation and liquid chromatography mass spectrometry were performed to analyze degradation pathway of iohexol in the system. Ultimately, the BCCN/light/PS system can provide a new method to degrade organic pollutants in aquatic environments.
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MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Zhenting Zhao,Yongjiao Sun,Yueyun Huang,Jiarui Jin,Xiaohui Wei,Weiping Gong,Jie Hu,Yong Chen
An ultrasensitive electrochemical glucose sensor was developed by hydrothermal growth of cobalt copper carbonate hydroxide nanowires (CCCH NWs) on copper foam (CF) and surface in situ growth of zeolitic imidazolate framework-67 (ZIF-67) derived cobalt oxide (Co 3 O 4 ) (Co 3 O 4 @CCCH NWs/CF). Benefitting from the large accessible surface area, the heterojunction between Co 3 O 4 and CCCH NWs, as well as the high electrical conductivity of copper foam, the electrochemical properties of Co 3 O 4 @CCCH NWs/CF sensor were significantly improved. As demonstration, we achieved an ultra-high sensitivity of 16.01 μA/μM/cm 2 , a wide linear range of 0.001 ~ 2.0 mM, and remarkable fast response-recovery times (1.5 s and 1.3 s) for emzymeless glucose detection based on the optimized sensor. Moreover, the fabricated Co 3 O 4 @CCCH NWs/CF sensor has a good reproducibility, a long-term stability and anti-bending property for glucose detection. More interestingly, this sensor can be used to determine the glucose level of real serum samples, thereby providing a useful tool for enzymeless glucose monitoring.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Wenyang Fu,Xuedong Du,Pei Su,Qizhan Zhang,Minghua Zhou
As nitrate contamination causes serious environmental problems, it is necessary to develop stable and efficient electrocatalysts for efficient electrochemical nitrate reduction reaction (ENRR). Here, a nonprecious Co3O4/carbon felt (CF) electrode with a 3D structure was prepared by integrating electrodeposition with calcination methods. This 3D structured Co3O4/CF electrode exhibits a high-rate constant of 1.18 × 10–4 s–1 cm–2 for the ENRR, surpassing other Co3O4 electrodes in previous literature. Moreover, it also has an excellent stability with a decrease of 6.4% after 10 cycles. Density functional theory calculations, electron spin resonance analysis, and cyclic voltammetry were performed to study the mechanism of the ENRR on the Co3O4/CF electrode, proving that atomic H* (indirect pathway) plays a prominent role in NO3– reduction and clarifying the synergistic effect of Co(III) and Co(II) in the Co(II)–Co(III)–Co(II) redox cycle for the ENRR: Co(III) prefers the adsorption of NO3– and Co(II) favors the production of H*. Based on this synergy, a relatively large amounts of Co(II) on the surface of the Co3O4/CF electrode (1.3 Co(II)/Co(III) ratio) was maintained by controlling the temperature of calcination to 200 °C with a lower energy barrier of H* formation of 0.46 eV than other ratios, which is beneficial for forming H* and enhancing the performance of the ENRR. Thus, this study suggests that building 3D structure and optimizing Co(II)/Co(III) ratio are important for designing efficient Co3O4 electrocatalyst for ENRR.
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PubMed
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
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2019
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IF 3.176
Wen Cui,Xiaoli Kang,Xiaoying Zhang,Zhou Zheng,Xudong Cui
Recently, Metal-organic framework (MOF) has attracted general attention as self-sacrificial template to produce metal oxide semiconductor (MOS) for gas sensing. In this work, we fabricated a porous cubic microstructure of Co 3 O 4 through the facile pyrolysis of ZIF-67. The obtained Co 3 O 4 sustained a similar cubic morphology with ZIF-67 template, but much improved pore structure was achieved. Moreover, we attempted to modify the Co 3 O 4 with Au nanoparticles . Through a facile post-synthesis adsorption & pyrolysis, the Au nanoparticles with an average size of 15–20 nm were evenly dispersed on the surface of Co 3 O 4 . Then the obtained samples were investigated for acetone gas-sensing. Results showed that both Co 3 O 4 and its Au doped structure could be used for acetone detection, while due to the existence of metal-semiconductor heterojunction and the catalysis and spillover functions of Au nanoparticles, the prepared Au/Co 3 O 4 composite showed much improved acetone response and much shortened response-recovery time than that of the bare Co 3 O 4 structure.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Chengwei Zhang,Yan Song,Lianbin Xu,Fuxing Yin
This work explores the fabrication of Co/Co 3 O 4 nanoparticles encapsulated in nitrogen-doped hierarchically ordered porous carbon (Co/Co 3 O 4 /NHPC) and investigates their electrochemical performance for lithium-ion batteries (LIBs). Co/Co 3 O 4 /NHPC is obtained from a typical dual-template (silica opal is employed as a hard template and F127 (EO 106 PO 70 EO 106 ) acts as a soft template to guide the mesoporous structure) by taking advantage of resol (phenol/formaldehyde) as carbon source, dicyandiamide as nitrogen source, and cobalt nitrate as cobalt source. We have optimized the performance of Co/Co 3 O 4 /NHPC composite base on the contents of Co/Co 3 O 4 in composite. 0.6-Co/Co 3 O 4 /NHPC (0.6 g cobalt nitrate in precursor solution) demonstrates a high discharge capacity (1823 mAh g −1 after 200 cycles at 0.2 A g −1 ), excellent cycling stability, and high-rate capability (1313/1056/576 mAh g −1 after 500 cycles at 2/5/10 A g −1 ). This outstanding LIB anode performance can be attributed to the hierarchically ordered porous carbon that could effectively provide rapid diffusion path way for electrolyte and metallic Co that could accelerate the transmission of electrons.
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CATALYSIS TODAY
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2019
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IF 4.888
Huifen Peng,Wulin Zhang,Yan Song,Fuxing Yin,Chengwei Zhang,Lei Zhang
The development of low-cost electrocatalyst with high efficiency is crucial in energy conversion and storage. The Co/Co 3 O 4 nanoparticles are encapsulated into N-doped porous carbon (Co/Co 3 O 4 /NPC) by one-step dual-template method. Co/Co 3 O 4 /NPC possesses hierarchically porous structure consisting of 3D ordered macroporous carbon frameworks and mesopores with large BET surface areas, and Co/Co 3 O 4 nanoparticles are uniformly enclosed in the carbon walls. Co/Co 3 O 4 /NPC exhibits better durability in alkaline solution for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) compared to commercial Pt/C and Ir/C. Such superior catalytic performance could be ascribed to the synergistic effects between embedded Co/Co 3 O 4 nanoparticles and the unique hierarchically porous structure.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Jie Yu,Yonghong Ni,Muheng Zhai
Co-based compounds, especially cobalt oxides, have been widely employed as the non-enzyme catalysts for the electro-oxidation of glucose. In this work, we designed a solution-combustion and subsequent heat-treating route to successfully prepare Co-CoO-Co 3 O 4 nanocomposites. Co-CoO nanocomposites were first obtained in one step via a simple solution-combustion method, employing CoCl 2 as the Co source, oxygen in air as the oxygen source, and ethanol as the solvent and fuel; and then, the freshly-prepared Co-CoO nanocomposites were annealed in air at 300–600 °C for 2 h. Experiments showed that the annealing temperature strongly affected the component of the final product. Co-CoO-Co 3 O 4 nanocomposites were produced at 300 and 400 °C; CoO-Co 3 O 4 nanocomposites were obtained at 500 °C; and Co 3 O 4 nanoparticles were formed at 600 °C. The above annealed products were labeled as T3, T4, T5 and T6. Electrochemical measurements showed that Co-CoO nanocomposite and its annealed products presented good electrochemical properties and could be employed as catalysts for the non-enzyme electro-oxidation of glucose. Among them, T4 sample (Co-CoO-Co 3 O 4 nanocomposites) possessed the best electrocatalytic activity. The as-prepared T4/GCE sensor showed rapid response time (<1s), high sensitivity (949.3 μA mM −1 cm −2 ), long linear range (0.005–0.6, 0.6–4.3 mM), low detection limit (0.92 μM), and good stability and selectivity.
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Journal of Materials Chemistry A
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2024
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IF 10.7
Fusen Lv,Rui Chen,Xiao Yang,Jiaqi Liu,Tie Liu,Kai Wang,Xiaoming Liu,Hao Li,Leiming Fang,Qiang Wang,Shuang Yuan
Due to the limitations of traditional materials or structures, many materials are difficult to meet usage requirements; therefore, there is an urgent need to develop new material preparation and structural control technologies. This study introduces a magnetic field during the growth process of ZIF-67, which changes the particle size and surface morphology of ZIF-67 and provides nanoscale mesoporous defect-rich Co3O4-M after direct calcination. The mesoporous structure of Co3O4-M provides effective channels for rapid electron transfer and lithium-ion storage, and it increases active-site density; the oxygen-vacancy defects increase the conductivity and pseudo-capacitance contribution. The Co3O4-M electrode exhibits a capacity of 1510 mA h g−1 after 300 cycles at a current density of 0.2 A g−1 and a capacity of 372 mA h g−1 after 1000 cycles at a current density of 5 A g−1, demonstrating excellent cycling stability. At the same time, it shows excellent fast charging and slow discharging performance, and the average charging time of Co3O4-M is 40 min. A lithium-ion capacitors (LIC) with activated carbon as the cathode and Co3O4-M as the anode achieves a high energy density of 322 W h kg−1 and high power density of 4885 W kg−1. After 3000 cycles at a current density of 1 A g−1, the capacity retention of this LIC is 60%.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Tao Shan,Sunzai Ke,Xin Yang,Xuhui Yang,Bo Weng,Lijuan Shen,Min-Quan Yang
Photocatalytic selective oxidation of aromatic hydrocarbons plays an important role in the production of value-added chemicals. A key step in this process is the activation of C(sp 3 )-H bond by photogenerated holes. However, the inadequate hole generation and lack of surface adsorption-activation sites severely hinders the improvement in photocatalytic C-H bond oxidation. In particular, the random charge migration to the surface impedes the effective capture of holes by surface active sites to dissociate the C(sp 3 )-H bond. Here, we design and fabricate a Co 3 O 4 /Cs 3 Sb 2 Br 9 p-n heterojunction that effectively addresses these challenges. The p-n heterojunction forms strong built-in electric fields (BEF) facilitating spatial charge separation. Holes are accumulated on Co 3 O 4 , while electrons are accumulated on Cs 3 Sb 2 Br 9 , thereby offering abundant active holes and electrons. Moreover, Co 3 O 4 shows stronger adsorption and activation capacity for the C(sp³)-H bond, enabling the C(sp 3 )-H bond dissociation with low reaction energy barrier. Consequently, the holes are directionally extracted from photoactive Cs 3 Sb 2 Br 9 to catalytically active Co 3 O 4 under visible light irradiation, thereby accelerating the toluene oxidation. The optimized 5 % Co 3 O 4 /Cs 3 Sb 2 Br 9 exhibits a benzyl aldehyde (BAD) evolution rate of 5044 μmol g −1 h −1 and a benzyl alcohol (BA) production rate of 1820 μmol g −1 h −1 , which are 12 and 17 times higher than that of blank Cs 3 Sb 2 Br 9 , respectively.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Jiaxin Li,Yan Lv,Xueyan Wu,Rui Xue,Zhuojun Yang,Jixi Guo,Dianzeng Jia
Discovering a valid approach to achieve a novel and efficient water splitting catalyst is essential for the development of hydrogen energy technology. Herein, unique hollow-structured ruthenium (Ru)-doped nickel–cobalt oxide (Ru-NiO/Co 3 O 4 /NF) nanocube arrays are fabricated as high-efficiency bifunctional electrocatalysts for hydrogen evolution reaction (HER)/urea oxidation reaction (UOR) through combined electronic and vacancy engineering. The structural characterization and experimental results indicate that the doping of Ru can not only effectively modulate the electronic structure of Ru-NiO/Co 3 O 4 /NF, but also increase the content of oxygen vacancies in the structure of Ru-NiO/Co 3 O 4 /NF to stabilize the existence of oxygen vacancies during the catalytic process. This can optimize the adsorption and desorption of the reactive intermediates on the surface of Ru-NiO/Co 3 O 4 /NF and dramatically accelerate the HER and UOR kinetics. As a result, the Ru-NiO/Co 3 O 4 /NF hollow structure nanocube arrays exhibit overpotentials of 21 and 60 mV for HER, as well as potentials of 1.36 and 1.42 V for UOR at 10 and 100 mA cm −2 , respectively. Furthermore, the coupled HER and UOR system requires only 1.59 V of cell voltage to drive a current density of 100 mA cm −2 , which is approximately 240 mV lower than conventional water electrolysis. This work provides a tremendous promise for the development of novel and high-activity electrocatalysts in future energy conversion applications.
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PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
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2024
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IF 4.7
Jiahua Zhang,Dong Xu,Dongsheng Lu,Hua Wang
Construction the electrocatalysts with multiple components is an effective strategy to enhance the activity for NH 3 generation in electrocatalytic nitrate reduction reaction (NITRR). Herein, we report a high performance electrocatalyst Co 3 O 4 -Cu 2+1 O/CF. The obtained Co 3 O 4 -Cu 2+1 O/CF nanosheets not only provide large active surface area but also construct the bimetal oxides interface for exerting Cu-Co tandem catalysis. Meanwhile, Co 3 O 4 -Cu 2+1 O/CF exhibits a maximum NH 3 -Faradaic efficiency of 96.5% and NH 3 yield of 0.26 mmol h −1 cm −2 in neutral solution with 10 mM NO 3 - . The control experiments and Tafel analysis clearly manifest the tandem catalysis mechanism on Co 3 O 4 -Cu 2+1 O/CF, where Cu 2+1 O favors the NO 3 - conversion to NO 2 - , while Co 3 O 4 selectively promotes NO 2 - conversion to NH 3 . The DFT calculations reveal that the strengthened NO 3 - adsorption and the enhanced adsorption of H* on Co 3 O 4 -Cu 2+1 O/CF jointly promote the selective formation of ammonia from NO 3 - reduction. This work provides the strategy of constructing the efficient transition metal composited electrocatalysts in NITRR.
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SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Zhijian Bu,Zheng Tang,Qiaoqiao Diao,Qingzhen Tian,Shu Li,Xinyu Chen,Jinjin Liu,Hao Liang,Xiangheng Niu
As the most stable form of uranium in water and soil, uranyl ions (UO 2 2+ ) possess strong biological toxicity and radioactivity, causing a great threat to human health. Therefore, it is of significance to develop reliable methods for monitoring uranyl ions in the environment. Here we propose a “light-up” colorimetric strategy based on target-accelerated peroxidase-mimicking activity of Co 3 O 4 for the specific detection of uranyl ions. Original Co 3 O 4 nanoparticles exhibit a certain peroxidase-like activity in catalyzing colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxTMB with the participation of H 2 O 2 . When UO 2 2+ is introduced, it interacts with the nanozyme rapidly and specifically and promotes the latter’s catalytic ability via increasing active oxygen vacancies on Co 3 O 4 surface. According to such a phenomenon and mechanism, selective determination of UO 2 2+ with favorable performance is achieved, with a linear measurement range of 0.2–10 μM and a detection limit of 0.08 μM. Reliability and practicability of the proposed method are demonstrated by analyzing the pollutant in several environmental water matrices. Our work not only offers a novel, efficient yet convenient approach for measuring UO 2 2+ , but may also inspire the exploration of new nanozyme-based sensing principles and strategies for other analytical applications.
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