CHEMICAL PHYSICS LETTERS
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2019
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IF 1.901
Xiaoyan Zhang,Xiumei Cheng,Feng Chen,Li Xu,Yaping Wang,Junchao Qian,Zhengying Wu,Qi Zhang
One of the crucial issues in fuel cells is to explore the highly-efficient, long-term stable and low-cost catalysts for the oxygen reduction reaction (ORR). Here, the carbon dots/Co 3 O 4 (CDs/Co 3 O 4 ) is reported as an effective electrocatalyst for ORR. The CDs/Co 3 O 4 was synthesized through an in-situ two-step heating strategy with the graphitic carbon nitride (g-C 3 N 4 ), cobalt nitrate hexahydrate and organic base as raw materials. The carbon dots (CDs) are derived from the C source of g-C 3 N 4 , which are in situ introduced into the Co 3 O 4 to form the CDs/Co 3 O 4 composite. Consequently, the introduction of CDs endows enhanced electrocatalytic activity of the CDs/Co 3 O 4 composite.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Qiaohong Su,Rui Sheng,Qingcui Liu,Juan Ding,Pengyue Wang,Xingchao Wang,Jiulin Wang,Yonggang Wang,Bao Wang,Yudai Huang
The rational construction of amorphous-crystalline heterointerface can effectively improve the activity and stability of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, RuO 2 /Co 3 O 4 (RCO) amorphous-crystalline heterointerface is prepared via oxidation method. The optimal RCO-10 exhibits low overpotentials of 57 and 231 mV for HER and OER at 10 mA cm −2 , respectively. Experimental characterization and density functional theory (DFT) results show that the optimized electronic structure and surface reconstruction endow RCO-10 with excellent catalytic activity. DFT results show that electrons transfer from RuO 2 to Co 3 O 4 through the amorphous-crystalline heterointerface, achieving electron redistribution and moving the d-band center upward, which optimizes the adsorption free energy of the hydrogen reaction intermediate. Moreover, the reconstructed Ru/Co(OH) 2 during the HER process has low hydrogen adsorption free energy to enhance HER activity. The reconstructed RuO 2 /CoOOH during the OER process has a low energy barrier for the elementary reaction (O*→*OOH) to enhance OER activity. Furthermore, RCO-10 requires only 1.50 V to drive 10 mA cm −2 and maintains stability over 200 h for overall water splitting. Meanwhile, RCO-10 displays stability for 48 h in alkaline solutions containing 0.5 M NaCl. The amorphous-crystalline heterointerface may bring new breakthroughs in the design of efficient and stable catalysts.
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高影响因子
Chemosensors
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2023
·Vol. 11
·期 7
·376
·
IF 4.2
Xiangxiang Fan,Susu Yang,Chun Huang,Yujie Lu,Pan Dai
In this work, ZIF-8-derived Co3O4@ZnO microspheres were prepared by a liquid-phase concentration-controlled nucleation strategy. The results of the material characterization showed that Co3O4@ZnO microspheres were obtained, and the surface structure could be controlled with the concentration of the ligand. Compared with pure Co3O4microspheres, the operating temperature of optimized Co3O4@ZnO microspheres increased by 90 °C after the gas-sensing test. The response to 50 ppm acetone of Co3O4@ZnO microspheres was 4.5 times higher than that of pure Co3O4, and the detection limit reached 0.5 ppm. Meanwhile, Co3O4@ZnO microspheres showed a shorter response-recovery time and better selectivity. The enhanced-sensing mechanism of the ZIF-8-derived Co3O4@ZnO microspheres was also analyzed.Keywords:gas sensor;microspheres;MOF;ZIF-8
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Ning Zhao,Qiyi Ma,Yanfu Wei,Shun Wang,Xuemin Zhong,Guanzheng Zhuang,Peng Yuan
Due to the low valence band maximum value, Co 3 O 4 is an outstanding catalyst, but its utilization in adsorption needs to be addressed. In this study, we proposed a novel method for loading aggregation-prone Co 3 O 4 onto sepiolite (Sep) to facilitate tetracycline (TC) adsorption. The XRD, TEM, and FTIR analyses demonstrated that the highly dispersed Co 3 O 4 was successfully anchored on the sepiolite grooves via the Si-OH on the sepiolite surface’s grooves to the cobalt site in Co 3 O 4 . We firstly proposed a view of how metal oxide aggregates are confined to the grooves on the surface of sepiolite (via Si-OH at the edges of the grooves on the sepiolite surface). The ultra-high sorption capacity of Co 3 O 4 -Sep is 219.53 mg/g for TC, which is three times that of Sep (70.75 mg/g) and Co 3 O 4 (85.29 mg/g). The kinetic and isotherm results fitting suggested that the adsorption of TC on Co 3 O 4 -Sep mainly contributed to the multilayer chemisorption adsorption process. Thermodynamic investigations revealed the spontaneous endothermic reaction of TC adsorption on Co 3 O 4 -Sep. Co 3 O 4 strengthened the complexation between the composite and functional groups of TC, significantly increasing TC adsorption capacity. In addition, the Co 3 O 4 -Sep retained an extraordinary adsorption capacity with the presence of competing ions, at strongly acidic and alkaline pH values and after three cycles. Therefore, this study offers new perspectives on applying cobalt-based materials and demonstrates the potential for antibiotic adsorption in the prepared composites.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Ruyi Zou,Lin Zhu,Lijun Yan,Bo Shao,Xiaoping Zhang,Wei Sun
Porous Co 3 O 4 nanorods were synthesized by the thermolysis of organometallic cobalt oxalate precursor via ultrasonic assisted method. FT-IR, XRD, XPS, SEM, TEM and BET were applied to characterize the effect of thermal treatment temperature on the properties of porous Co 3 O 4 nanorods. A three-electrode system was used to perform cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge measurements to study the electrochemical behaviours of Co 3 O 4 nanorods modified nickel foam electrodes. Compared with Co 3 O 4 prepared by pyrolysis at various temperatures, Co 3 O 4 nanorods obtained at 300 °C had the highest specific capacitance of 226.80 F·g -1 at a current density of 1 A·g -1 in the potential range of -0.4 to 0.6 V (vs. Hg/HgO). After performing 1000 cycles in 2 M KOH electrolyte, 99.76% of specific capacitance was retained, showing the excellent stability of Co 3 O 4 nanorods modified electrode.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Jie Hu,Xueqing Xiong,Wangwang Guan,Haizhu Long
To facilitate the effective monitoring of human health and environmental quality, it is essential to develop high-quality gas sensors for trimethylamine (TEA) with stable sensing sensitivity and low resistance fluctuations in a wide range of humid atmospheres. To this end, a novel Bubble-like Co 3 O 4 tube was fabricated through a ZIF-67 intermediate-assisted thermal decomposition strategy, and its surface morphology and nanostructure were comprehensively investigated. Furthermore, a systematic comparison of the gas sensing properties between Rod-like Co 3 O 4 and Bubble-like Co 3 O 4 was also conducted. The results demonstrated that the introduction of ZIF-67 intermediate not only decreased the baseline resistance of the Bubble-like Co 3 O 4 sensor but also enhanced its gas-sensing performance. Specifically, the response value of the sensor fabricated using Bubble-like Co 3 O 4 for detecting 100 ppm TEA at 180 °C was around ten times higher than that of the Rod-like Co 3 O 4 sensor, while achieving a low detection limit of 55 ppb. Furthermore, the gas sensor exhibited excellent selectivity and anti-humidity stability, with negligible variation in response value even after 30 days, retaining approximately 98 % of the initial value. This remarkable sensing-performance can be attributed to several factors, including the large specific surface area, abundant oxygen vacancies , and efficient Co 3+ /Co 2+ catalyzing. Overall, this work sheds new light on the rational design of high-performance TEA sensing materials for practical applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Fanfan Shang,Huijie He,Peng Li,Hairui Cai,Bei An,Xiaoqian Li,Shengchun Yang,Zhanbo Sun,Bin Wang
It is challenging to develop high-efficient and stable nonprecious metal-based electrocatalyst for oxygen evolution reaction (OER) in acid for proton exchange membrane (PEM) water splitting. Herein, P atoms were introduced into the lattice of spinel Co 3 O 4 (P-Co 3 O 4 ) to replace with octahedral coordinated Co 3+ via a hydrothermal process following a thermal treatment. The formation of PO 6 geometric configuration unit in Co 3 O 4 can trigger electron rearrangement around Co ions , which resulted in the high-active Co 2+ site on the surface, significantly decreasing the energy barrier of rate-determining step for OER. Moreover, the weaker covalency of the Co 3d-O 2p bond and higher formation energy of oxygen vacancy around Co 2+ in P-Co 3 O 4 inhibited the participation of lattice oxygen during OER process, enabling that P-Co 3 O 4 can work stably in acidic media. The obtained P-Co 3 O 4 afforded satisfying stability over 30 h in a PEM electrolysis device with an overpotential of 400 mV@10 mA/cm 2 in 0.1 M HClO 4 .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Huixuan Zhang,Jinning Wang,Xinyi Zhang,Bo Li,Xiuwen Cheng
In the present study, a novel Co 3 O 4 /δ-FeOOH composite was successfully fabricated. Subsequently, we measured its crystal structure, morphology, and surface area. After this, the Co 3 O 4 /δ-FeOOH composite was applied to activate peroxymonosulfate (PMS) for lomefloxacin (LOM, a type of fluoroquinolones) degradation. Compared with pure Co 3 O 4 and δ-FeOOH, Co 3 O 4 /δ-FeOOH composite exhibited the best efficiency towards LOM degradation, in which the removal of LOM (>82%) and first order reaction kinetic rate constant (k app = 0.064 min −1 ) were achieved after 25 min reaction with 0.25 g·L −1 Co 3 O 4 /δ-FeOOH, 0.49 mM PMS, and 10 mg·L −1 (28.5 μM) LOM at initial pH 6.08. Next, we considered the concentration of catalyst, PMS and the effect of pH on LOM degradation. The results showed that the increase of PMS and catalyst was beneficial for the degradation of LOM. Moreover, the highest degradation efficiency of LOM was achieved under neutral conditions, which was due to the minimum repulsive force between the PMS and the catalyst. In addition, active radical scavenging experiment was performed and it was found that the contribution of hydroxyl radicals was greater than that of sulfate radicals. Subsequently, possible reaction mechanism was proposed. What’s more, possible degradation intermediates in Co 3 O 4 /δ-FeOOH system were determined and five decomposition pathways were proposed. Meanwhile, activated sludge inhibition experiment was carried out to evaluate the variation of toxicity of the LOM and its degradation intermediates in the oxidation process. Overall, this work provided a new strategy for the practical application of sulfate radicals-based advanced oxidation processes (SR-AOPs) in wastewater treatment.
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高影响因子
JOURNAL OF POWER SOURCES
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2019
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IF 7.467
Jian Liu,Zhanyu Li,Xiaogeng Huo,Jianling Li
Aluminium ion batteries are considered to be a promising development for large-scale energy storage and conversion applications. In this research, a nanosphere-rod-like Co 3 O 4 has been synthesized after the hydrothermal reaction and the subsequent heat treatment process , which is used for the cathode materials of aluminium ion batteries. The working mechanisms of the Co 3 O 4 are deeply investigated. It is found that the electrochemical deposition and dissolution of aluminum occurs on the surface of pure aluminium anode, and the Al 3+ cations are intercalated and de-intercalated in the cathode materials during the discharge and charge processes. The battery exhibits a high discharge specific capacity of 490 mAh g −1 at the first cycle, with the current density of 50 mA g −1 . Furthermore, the discharge capacity still maintains a high level of 122.1 mAh g −1 after 100 cycles at the current density of 200 mA g −1 , indicating a good cycle performance. Therefore, the nanosphere-rod-like Co 3 O 4 as the cathode for aluminium ion batteries has a promising potential.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Ya Xiong,Xiao Chang,Xurong Qiao,Kun Li,Lei Zhu,Fujun Xia,Xiaofang Li,Qingbin Zheng,Wei Xing,Qingzhong Xue
For the first time, Co-MOF-74 derived Co 3 O 4 /graphene heterojunction nanoscrolls (Co 3 O 4 /GNS) structure is synthesized by a simple one-step hydrothermal strategy and subsequent calcination process. Theoretically, the growth mechanism of Co 3 O 4 /GNS is revealed by molecular dynamic simulation, demonstrating that a high loading of Co-MOF-74 nanoparticles is needed for effective rolling of GO. The sensor based on Co 3 O 4 /GNS exhibits high response of 58.1 (34-fold enhancement compared with that of Co 3 O 4 ), short response/recovery time of 12 s/66 s (157 s/200 s for Co 3 O 4 ) toward 1 ppm acetone at 190 °C and superior selectivity, which are much better than those of most reported acetone sensors. Moreover, the Co 3 O 4 /GNS can even detect as low as 50 ppb acetone with a notable response (1.24). The appreciable response together with rapid response/recovery of Co 3 O 4 /GNS is attributed to the large heterojunction interface between Co 3 O 4 and graphene nanoscroll and high-speed gas transfer pathways provided by nanoscroll. This unique structure design is believed to offer guidance for generalizable synthesis of metal oxide/GNS that can be effectively applied in the fields of ppb-level gas detection.
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高影响因子
Journal of Biomedical Nanotechnology
·
2018
·Vol. 14
·期 6
·1169-1177
·
IF 5.068
Ma Yuchan,Lu Mingyue,Deng Yan,Bai Ruyan,Zhang Xi,Li Delei,Zhang Kunlei,Hu Rong,Yang Yunhui
In this work, a nano-mimetic enzyme Co3O4 nanoparticles with catalytic effect on the reduction of H2O2, was synthesized and used to label C-reactive protein antibody. Au nanoparticles (Au NPs) were loaded on COF-TpPa-1 to form Au NPs@COF-TpPa-1
with good biocompatibility and adsorption ability. A sandwich C-reactive protein immunosensor was prepared using Au NPs @COF-TpPa-1 as the immobilization matrix. The catalytic current of Co3O4 nanoparticles to the reduction of H2O2 was measured by
the chronoamperometry which is in proportion to the concentration of CRP. The linear range of this immunosensor was 0.05–80 ng/mL with the linear correlation coefficient of 0.9955. The method demonstrated a good sensitivity with a detection limit of 0.017 ng/mL (S/N = 3) for CRP.
When the C-reactive protein immunosensor was applied to real serum samples analysis, the satisfied results were obtained, indicating that the immunosensor is of prospect of application.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Zhen Cheng,Zhu Chen,Jingrong Li,Shufeng Zuo,Peng Yang
Mesoporous silica-pillared clay (SPC) was synthesized by a soft template method. Compared with the raw montmorillonite (MMT), the basal spacing of SPC increased from 0.96 to 2.61 nm, the specific surface area increased from 30 to 453 m 2 /g, and the thermal stability was also improved, all of which could reduce the mass transfer resistance and improve the adsorption capacity of toluene. SPC supported Co 3 O 4 and rare earth (Y, La, Ce, Pr and Nd) nano-composite catalysts were prepared by a deposition-precipitation method. Among them, 10% Co-5% Ce/SPC displayed the highest catalytic combustion activity, and the reaction temperature for toluene combustion was about 200 °C (98% conversion). This catalyst displayed good durability, and conversion of toluene dropped slightly from 96% to 90% in 1000 h continuous reaction at 190 °C. Co 3 O 4 and CeO 2 had particle sizes of 5–8 nm and were dispersed homogeneously on the surface of SPC. Introduction of CeO 2 enhanced oxygen storage/transport capacity, and improved the dispersion of Co 3 O 4 on SPC. The interaction of Co 3 O 4 -CeO 2 and SPC, the co-existence of Co 2+ /Co 3+ and the higher concentration of Ce 3+ ions on the catalyst surface contribute to the high catalytic oxidative activity of 10% Co-5% Ce/SPC for toluene combustion.
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危险品化学品经营许可证（带存储）