MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Ruilin Liu,Xiaoping Wei,Jianping Li
An amperometric method with synergistic electrocatalysis on photoelectrocatalysis was proposed, and it was used for the detection of trace glucose concentrations for the first time. Under illumination of an external xenon lamp light source, the electrocatalytic oxidation reaction of glucose on a Co 3 O 4 -modified electrode produced a synergistic effect on the photoelectrochemical reaction of glucose. The separation of electron–hole pairs generated by the photoelectrochemical reaction was promoted, and the photoelectric conversion efficiency was improved. As a result, the photoelectric current increased, and the sensitivity of the amperometric method was enhanced by about 9 times. The mechanism of synergistic electrocatalysis on photoelectrocatalysis was studied. The method can be used for the determination of glucose with a linear concentration range of 1.0 × 10 −8 M to 3.5 × 10 −7 M. The sensitivity was 7,753 μA cm −2 mM −1 , and the detection limit was 3.6 × 10 −9 M. Compared with conventional photoelectrochemical analysis methods, the chronoamperometric method has higher sensitivity and lower detection limit. The method has been used for the direct determination of trace amounts of glucose in saliva and sweat.
研究领域:
分析化学
·
生物医学工程
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DOI
高影响因子
Small
·
2018
·Vol. 14
·期 21
·1800225
·
IF 9.598
Peng Tan,Bin Chen,Haoran Xu,Weizi Cai,Wei He,Meilin Liu,Zongping Shao,Meng Ni
The rapid development of electric vehicles and modern personal electronic devices is severely hindered by the limited energy and power density of the existing power sources. Here a novel hybrid Zn battery is reported which is composed of a nanostructured transition metal oxide-based positive electrode (i.e., Co 3 O 4 nanosheets grown on carbon cloth) and a Zn foil negative electrode in an aqueous alkaline electrolyte. The hybrid battery configuration successfully combines the unique advantages of a Zn–Co 3 O 4 battery and a Zn–air battery, achieving a high voltage of 1.85 V in the Zn–Co 3 O 4 battery region and a high capacity of 792 mAh g Zn −1 . In addition, the battery shows high stability while maintaining high energy efficiency (higher than 70%) for over 200 cycles and high rate capabilities. Furthermore, the high flexibility of the carbon cloth substrate allows the construction of a flexible battery with a gel electrolyte, demonstrating not only good rechargeability and stability, but also reasonable mechanical deformation without noticeable degradation in performance. This work also provides an inspiring example for further explorations of high-performance hybrid and flexible battery systems.
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MATERIALS LETTERS
·
2014
·
IF 2.269
Daixiong Zhang,Xueming Li,Xiaogang Guo,Chuan Lai
In this study, electrophoretic deposition (EPD) of nano-cobalt oxide (Co 3 O 4 ) particle (30 nm) was investigated to develop coatings with potential applications in many fields. Nano-Co 3 O 4 particles were suspended in mixture of acetylacetone and ethanol and stable suspensions were obtained. The deposits were characterized qualitatively by X-ray diffraction, SEM observations and EDS analysis. The coating growth rate was varied by different deposition times in the range of 1–30 min at voltages of 100–150 V. Results of this study demonstrate that EPD is a feasible method of fabricating nano-Co 3 O 4 coating which is of potential interest in gas sensors, heterogeneous catalysts, supercapacitors and many other applications.
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Si-Ming Wu,Yi-Tian Wang,Nan Jiang,Shi-Tian Xiao,Jia-Xin Shi,Ying Wan,Zhi-Qiang Luo,Xiao-Yu Yang
Hierarchical structured mesoporous Co 3 O 4 /SiO 2 composites have been fabricated by the in-situ transformation of cobalt nanocrystals in the mesoporous silica. The hierarchical porous composites show good structural stability during the thermal treating process and demonstrate high crystallinity after phase transformation. The highly crystalline Co 3 O 4 /SiO 2 composite has uniform mesopores and exhibits good adsorption ability. This method offers a promising way to the design of hierarchical structured mesoporous materials with highly crystalline framework.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Hongji Peng,Xiaoliang Zhang,Bingrong Wang,Yang Cao,Mingyu wang,Delun Chen,Xiaohong wang,Jinchun Tu
In seawater electrolysis for hydrogen production, the competition between chlorine evolution and oxygen evolution reaction (OER) at the anode limits its hydrogen yield and system stability. To address this, we optimized the anode material by modulating the surface electronic structure of the active sites of Co 3 O 4 using atomic layer deposition (ALD) technology. By introducing the atomic layers of NiO x species, this approach results in the synthesis of a NiO x @Co 3 O 4 /Carbon cloth (CC) heterojunction, which serves as an effective oxygen evolution reaction electrocatalyst for high-performance seawater electrolysis. Adjusting the deposition cycles creates unique material interfaces that facilitate the transformation of reaction intermediate. The NiO x @Co 3 O 4 /CC heterostructure demonstrates superior catalytic performance over single-phase materials, which is attributed to its unique Ni-O-Co interface, showing low overpotentials of 204 mV in alkaline freshwater and 235 mV in seawater solutions at 10 mA cm −2 , 285 mV in alkaline freshwater and 329 mV in seawater solutions at 100 mA cm −2 . In addition, the incorporation of NiO x endowed the material with enhanced overall durability and corrosion resistance, reducing Cl-related species adsorption. After 300 h of chronoamperometric testing, the voltage remained stable, indicating its potential as an ideal electrocatalyst for seawater electrolysis under alkaline conditions.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 99
·97055-97062
·
IF 3.289
Shan Fan,Wen Wang,Hua Ke,Jian-Cun Rao,Yu Zhou
A heterostructured Co3O4/CoFe2O4 nanocomposite material is synthetised via the solid–solid reaction of an iron precursor with urchin-like Co3O4 which was prepared via hydrothermal treatment. The coupling of Co3O4 to the hard ferrimagnet CoFe2O4 leads to reinforcement for the magnetic interaction of the interfaces and the mismatched surface spin in the Co3O4/CoFe2O4 nanocomposite is greatly reduced. The magnetic performance of the exchange-coupled anti-ferromagnetic/ferrimagnetic (AFM/FM) system is investigated with superconducting quantum interference device magnetometry. In an applied magnetic field, the low-temperature magnetization loops of the nanocomposite heterostructure exchange bias under cooling. The antiferromagnetic ordering temperature of Co3O4 is increased owing to the adjacent hard magnetic CoFe2O4 phase. The Co3O4/CoFe2O4 nanocomposite behaves as an exchange coupled system with cooperative magnetic switching.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
Heliyon
·
2023
·
IF 4
Panpan Zhang,Jinghua Liu,Chunjing Zhou,Zebin Xue,Yifan Zheng,Haodong Tang,Zongjian Liu
Three types of Co 3 O 4 catalyst, namely Co 3 O 4 nanoparticles (denoted as Co 3 O 4 -NPs, ∼12 nm in diameter), Co 3 O 4 nanoparticles encapsulated in mesoporou s SiO 2 (denoted as Co 3 O 4 @SiO 2 ), and Co 3 O 4 nanoparticles inside microporous SiO 2 hollow sub-microspheres (denoted as Co 3 O 4 -in-SiO 2 ), were explored to catalyze the combustion of lean methane. It was found that the methane conversion over the three catalysts has the order of Co 3 O 4 -NPs ≈ Co 3 O 4 @SiO 2 > Co 3 O 4 -in-SiO 2 due to the different catalyst structure. The comparison experiments at high temperatures indicate the Co 3 O 4 @SiO 2 has a significantly improved anti-sintering performance. Combined with the TEM and BET measurements, the results prove that the presence of the mesoporous SiO 2 layer can maintain the catalytical activity and significantly improve the anti-sintering performance of Co 3 O 4 @SiO 2 . In contrast, the microporous SiO 2 layer reduces the catalytical activity of Co 3 O 4 -in-SiO 2 possibly due to its less effective diffusion path of combustion product. Thus, the paper demonstrates the pore size of SiO 2 layer and catalyst structure are both crucial for the catalytical activity and stability.
研究领域:
催化化学
·
材料科学
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 46
·期 5
·5963-5972
·
IF 5.164
Guoru Li,Xiaoting Yu,Fengxiang Yin,Zhiping Lei,Xinran Zhao,Xiaobo He,Zhichun Li
Summary To reduce the overpotential of electrocatalytic oxygen evolution reaction (OER) for high-efficiency water splitting, a series of 2 to 5 nm ultrafine spinel Co 3 O 4 nanoparticles (NPs) with varied amount of lattice-doped Te (XTe-Co 3 O 4 , X represents the nominal molar ratio Te/Co of 0, 2, 4, 6, 8%) as catalysts were prepared through a simple hydrothermal synthesis method. The 6%Te-Co 3 O 4 catalyst was optimized to obtain the overpotential as low as 313 mV at 10 mA cm −2 , a small Tafel slope of 75 mV dec −1 in 1 M KOH for OER, outperforming this series and many reported Co 3 O 4 -based catalysts. Te doping introduced lattice distortion and resulted in smaller size of Te-Co 3 O 4 NPs with enlarged surface area for more accessible active sites. Oxygen vacancies were created to modify the electronic structure, improve the active sites density, and decrease the kinetic energy barriers of XTe-Co 3 O 4 . The electronic conductivity of 6%Te-Co 3 O 4 was improved to accelerate the charge transfer efficiency. All these effects contributed to promoting the reaction kinetics and minimizing the OER overpotentials for high-performance electrocatalysis.
研究领域:
材料科学
·
电催化
·
能量转换
·
纳米材料
·
无机化学
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DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Yuxin Shi,Sirui Liu,Chen Ouyang,Zhikun Xu,Hongxu Su,Jing Yao,Mingyi Zhang,Xinzhi Ma
One-dimensional nanowires possess significant advantages in active site exposure and electron and matter transport. Their oxygen evolution reaction (OER) performances can be well enhanced by the introduction of oxygen vacancies (Ov) and boron element (B), which, however, have not been achieved simultaneously. Herein, the Ov and BOx motifs were simultaneously employed in typical cobalt spinel oxide nanowires via simple NaBH4 hydrolysis (Co3O4/BOx). When grown on carbon fiber cloth, the observed Co3O4/BOx nanowire array electrode drives a current density of 10 mA cm–2 with only 328 mV overpotential in a 1.0 M KOH solution, which is much superior to the spinel Co3O4. We found that the BOx motifs and Ov have efficiently tuned electronic structures of Co3O4, thereby enhancing the electrical conductivity and generating a large number of electroactive sites. This study provides a simple solution for designing and producing nanostructure OER catalysts with excellent electrochemical performance.
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产品关联
DOI
高影响因子
Inorganics
·
2022
·Vol. 10
·期 4
·49
·
IF 3.149
Changpeng Lv,Dan Du,Chao Wang,Yingyue Qin,Jinlong Ge,Yansong Han,Junjie Zhu,Muxin Liu
The development of non-noble Co3O4catalysts exposing highly active crystal planes to low-temperature methane oxidation is still a challenge. Hence, a facile solvothermal method was adapted to construe flower-like Co3O4hierarchical microspheres (Co3O4-FL), which are composed of nanosheets with dominantly exposed {112} crystal planes. The flower-like hierarchical structure not only promotes the desorption of high levels of active surface oxygen and enhances reducibility, but also facilitates an increase in lattice oxygen as the active species. As a result, Co3O4-FL catalysts offer improved methane oxidation, with a half methane conversion temperature (T50) of 380 °C (21,000 mL g−1h−1), which is much lower than that of commercial Co3O4catalysts (Co3O4-C). This study will provide guidance for non-noble metal catalyst design and preparation for methane oxidation and other oxidative reactions.Keywords:flower-like;tricobalt tetroxide;methane;oxidation
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DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
Lina Yan,Xing Cheng,Yueshuai Wang,Zhaozhao Wang,Lirong Zheng,Yong Yan,Yue Lu,Shaorui Sun,Wenge Qiu,Ge Chen
The electrochemical production of hydrogen peroxide via the two-electron (2e − ) oxygen reduction reaction (ORR) is an environmentally friendly method and is expected to be an alternative means to the industrial anthraquinone process. It is particularly suitable for on-site and small-scale H 2 O 2 requirements. The development of earth-abundant catalysts with high activity and selectivity toward H 2 O 2 is highly desirable and challenging. Here, we have prepared Co 3 O 4 with tunable oxygen vacancies (OVs) and strongly coupled it to nitrogen-doped carbon nanotubes through an exsolution strategy. The Co 3 O 4 with a higher OV concentration exhibits a higher 2e − ORR activity, higher H 2 O 2 selectivity, and lower H 2 O 2 reduction reaction (H 2 O 2 RR) activity so that effectively improving the production rate of H 2 O 2 (1.6 mol peroxide/g catalyst /h at 0.0 V RHE ) in acidic media. The catalyst is also used as a cathode for the electro-Fenton process and degrades up to 80% of 40 mg/L of rhodamine B solution within 25 min. Density functional theory calculation shows that the ∗ OOH binding energy (Δ G ∗OOH ) could decrease on increasing the numbers of OVs, which subsequently benefits the protonation of ∗ OOH to generate H 2 O 2 .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yaqun Yu,Yuefei Ji,Junhe Lu,Xiaoming Yin,Quansuo Zhou
In this study, a simple hydrothermal method was used to synthesize Co 3 O 4 -palygorskite composites. Transmission electron microscopy, X-ray spectroscopy and X-ray diffraction analysis showed that Co 3 O 4 nanoparticles with diameters of approximately 3–5 nm were uniformly distributed on the surface of palygorskite fibers. Co 3 O 4 -palygorskite composites were outstanding catalyst for activating peroxymonosulfate (PMS) to degrade the antibiotic sulfamethoxazole (SMX). Complete removal of 30 μM SMX at pH 3–5 was achieved with doses of 0.3 mM PMS and 125 mg/L Co 3 O 4 -palygorskite composites. The composites exhibited higher catalytical activity than unsupported Co 3 O 4 . The removal rate of SMX was accelerated under acidic conditions (pH 3–5), while was significantly inhibited under basic conditions (pH 11–12). Radical quenching tests revealed that SO 4 − and OH were responsible for the degradation. The oxidative degradation was initiated at either isoxazole or aniline moiety of the SMX molecule. Using solid phase extraction-liquid chromatography-time-of-flight-tandem mass spectrometry, a total of six transformation products formed from benzene ring hydroxylation, S-N bond cleavage, aniline moiety oxidation and coupling reactions were identified. Based on the products, three transformation pathways are proposed for the catalytic degradation of SMX in the Co 3 O 4 -palygorskite/PMS system.
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