INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Xunxun Li,Yaru Wang,Dongyun Chen,Jun Xiao,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Oxygen vacancies have been verified to be an important factor in the catalytic oxidation of VOCs. Herein, we report that surface-modified Co/Ce hexagonal nanosheets have excellent catalytic activity, stability, and water resistance. The introduction of cerium increases the oxygen storage capacity of the catalyst. In this work, the best catalyst (1.00 wt % Pd Co/Ce = 4/1) showed the highest catalytic activity for VOC oxidation (T90(toluene) = 160 °C, T90(benzene) = 156 °C). Combining XPS and O2-TPD data, it has been demonstrated that the introduction of cerium increases the adsorbed oxygen concentration of the catalyst. The oxidation of toluene and benzene over the 1.00 wt % Pd Co/Ce = 4/1 catalyst obeys the Langmuir–Hinshelwood (L–H) mechanism.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 128
·期 1
·1-14
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IF 2.584
Chen Peng,Wu Keliang,Peng Xiang,Ma Yue,Yang Xuqi,Duan Xinping,Ma Yan,Liu Zhiyong
Hydrogen and oxygen production based on photocatalytic monolithic water splitting is considered to be one of the effective ways to produce sustainable and clean energy. The key challenge in this process is to develop new photocatalysts that can simultaneously produce H 2 and O 2 at a stoichiometric ratio of 2:1 without the use of any sacrificial agents. In order to solve this problem, highly efficient and ingenious photosystems in nature have been studied intensively. Herein, we prepared printable Z-type composite photocatalysts CdS@TiO 2 /Pt/ITO/WO 3 /Co 3 O 4 mimicking biological vegetative leaves in nature and constructed an “artificial leaf” device that completely decomposes water. We use an electron solid penetrating transporter ITO, which can rapidly transfer photogenerated electrons and photogenerated holes and reduce the compound rate of photogenerated carriers. Thus, the efficiency of photocatalytic total water dissolution is enhanced. This photocatalyst was able to produce both H 2 and O 2 in water with an H 2 production rate of 75.93 μmol g −1 h −1 and an O 2 production rate of 36.49 μmol g −1 h −1 . We designed the oxygen-producing photocatalyst WO 3 /Co 3 O 4 , which produced oxygen at a rate of 159.21 μmol g −1 h −1 6 times higher than that of WO 3 alone. Furthermore, the morphology, composition, and microstructures of the photocatalyst were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and nitrogen adsorption–desorption.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yu Liu,Xiumei Chen,Huachen Lin,Pengjie Zhou,Yulong Ying
It is an important method to enhance the electrochemical performance of metal oxide electrode by phosphorus doping in the research of high-performance hybrid supercapacitors . Herein, we obtain a P-doped carbon nanotubes (CNT)@MnCo 2 O 4 /Co 3 O 4 film by an in-situ synthesis and subsequent phosphating. By introducing P heteroatoms, the electronic structure of MnCo 2 O 4 /Co 3 O 4 can be effectively modulated, thereby improving the electrical conductivity and increasing Faraday reaction. The electrochemical tests show that the capacity and rate performance of CNT@MnCo 2 O 4 /Co 3 O 4 have been significantly improved after phosphorus doping. The P-CNT@MnCo 2 O 4 /Co 3 O 4 electrode displays an acceptable specific capacitance of 1064.4 F g −1 . Furthermore, a supercapacitor P-CNT@MnCo 2 O 4 /Co 3 O 4 //activated carbon possesses 46.4 W h kg −1 of energy density at 800 W kg −1 . After 10000 repeated tests, the device keeps 85.0 % of the original capacitance. The above results show that the P-doped CNT/metal oxide film we designed has some inspiration on the design of energy storage electrode materials.
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TALANTA
·
2023
·
IF 6.1
Chaonan Jiao,Ying Zhu,Tongkai Ji,Xingwei Cai,Jing Wang
For yolk-shell structured nanoreactors , multiple active components can be precisely positioned on core and/or shell that can afford more exposed accessible active sites, and the internal voids can guarantee sufficient contact of reactants and catalysts. In this work, a unique yolk–shell structured nanoreactor [email protected] 3 O 4 /CeO 2 @mSiO 2 was fabricated and applied as nanozyme for biosensing. The [email protected] 3 O 4 /CeO 2 @mSiO 2 exhibited superior peroxidase-like activity with a lower Michaelis constant ( K m ) and a higher affinity to H 2 O 2 . The enhanced peroxidase-like activity was attributed to the unique structure and the synergistic effects between the multiple active components. Colorimetric essays were developed based on [email protected] 3 O 4 /CeO 2 @mSiO 2 for the ultra-sensitive sensing of glucose in the range of 3.9 nM–1.03 mM with the limit of detection as low as 3.2 nM. In the detection of glucose-6-phosphate dehydrogenase (G6PD), the cooperation between G6PD and [email protected] 3 O 4 /CeO 2 @mSiO 2 triggered the redox cycling between NAD + and NADH, thereby achieving the amplification of the signal and enhancing the sensitivity of the assay. The assay showed superior performance as compared to other methods with linear response of 5.0 × 10 −3 –15 mU mL −1 and lower detection limit of 3.6 × 10 −3 mU mL −1 . The fabricated novel multi-enzyme catalytical cascade reaction system allowed rapid and sensitive biodetection, demonstrating its potential in biosensors and biomedical applications.
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APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Yichen Zhang,Shugui Hua,Xiaoqin Sun,Zhuoyue Liu,Yuan Dang,Liang Zhang,Yuanzhen Zhou
A sea urchin-like NiO/Co 3 O 4 composite cathode was synthesized by two-step hydrothermal in-situ growth method and a Fenton-like process inducing two-electron oxygen reduction reaction (ORR) was established to degrade levofloxacin (LEV) in this paper. NiO/Co 3 O 4 exhibited higher specific surface area and better electrical conductivity comparing with NiO or Co 3 O 4 , indicating an excellent synergistic effect between NiO and Co 3 O 4 . Moreover, NiO/Co 3 O 4 cathode could effectively degrade LEV wastewater, the removal efficiency could reach 77.8% after 120 min and the corresponding COD removal efficiency was 41.0%. Further studies showed that the effective conversion of Co(Ⅱ)/Co(Ⅲ) and Ni(Ⅱ)/Ni(Ⅲ) occurred on the electrode surface, which promoted the generation of •OH. Finally, a possible degradation pathway of LEV involved defluorination, deamination, demethylation and other processes was proposed. In short, the research could provide important reference for solving electrochemical problems related to electrocatalytic ORR and Fenton-like degradation of antibiotic wastewater.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhijia Liao,Zhenyu Yuan,Hongliang Gao,Fanli Meng
In response to the pressing demand for acetic anhydride gas detection, this study introduces a novel gas sensor for precisely detecting acetic anhydride concentrations. The optimum conditions for the synthesis of cobalt hydroxyfluoride/cobalt oxide (CHFCO) heterojunctions with good acetic anhydride gas sensitivity were determined by carefully adjusting the calcination time, hydrothermal time and ammonium fluoride content. The best performing composite CHFCO sensor with porous rod particles was tested at 180 ℃ and achieved a response rate of 260 for 100 ppm acetic anhydride gas, with response and recovery times of 60 and 40 s, respectively. In comparison to other prepared sensors, the detection response for acetic anhydride was improved by a factor of 4.30–23.63. Moreover, the CHFCO sensor reliably detected acetic anhydride at a concentration of 500 ppb, exhibiting a response value of 1.56. Notably, the sensor demonstrated great selectivity, moisture resistance , and stability. The findings highlight the significant enhancements in gas-sensitive performance to acetic anhydride achieved by the abundant hydroxyl bonds on the surface of CHFCO heterojunction, the presence of fluorine ions , and the modulation of the band gap. These results provide valuable insights for the advancement of acetic anhydride gas sensors based on CHFCO heterojunction.
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ENERGY & FUELS
·
2021
·
IF 3.605
Zhaogen Zhu,Jinming Zhang,Xiaomin Peng,Yiyi Liu,Tianlun Cen,Zhifeng Ye,Dingsheng Yuan
Developing efficient bifunctional electrocatalysts with excellent oxygen reduction and evolution reaction (ORR/OER) activity to meet practical demands in Zn–air batteries (ZABs) is highly crucial and challenging. Herein, a simple hydrothermal one-step method is exploited to successfully synthesize Co3O4–NiCo2O4 anchored on N-doped reduced graphene oxide nanosheets (Co3O4–NiCo2O4/N-RGO). The active sites present in Co3O4–NiCo2O4/N-RGO and the synergy between N-RGO and Co3O4–NiCo2O4 accelerate the charge transfer and transport rate during the electrochemical course, which improves the ORR/OER activities of the Co3O4–NiCo2O4/N-RGO electrocatalyst. As expected, the Co3O4–NiCo2O4/N-RGO exhibits a better half-wave potential in the ORR and a lower Tafel slope during the OER process. A ZAB with optimal Co3O4–NiCo2O4/N-RGO as the cathode gives a higher open-circuit voltage (1.49 V), larger power density (97 mW cm–2), and better stability (180 h).
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 15
·9419-9433
·
IF 4.22
Xuan Haicheng,Wang Rui,Yang Jing,Zhang Guohong,Liang Xiaohong,Li Yuping,Xie Zhigao,Han Peide
Currently, substantial attention has been concentrated on the preparation and practical application of complex hierarchical nanostructure composite, which exhibits excellent electrochemical properties compared to the single-structured materials. Hence, a novel electrode of NiMoO 4 @Co 3 O 4 –5H composite nanoarrays supported on reduced graphene oxide/Ni Foam (rGO/NF) was synthesized through the facile hydrothermal method. The composite combines the advantages of the large specific capacitance of NiMoO 4 and the great rate capability of Co 3 O 4 , exhibiting the distinguished specific capacitance and rate performance. The prepared NiMoO 4 @Co 3 O 4 –5H composite shows an enhanced pseudocapacitive performance of about 1722.3 F g −1 at a current density of 1 A g −1 , and eminent rate capability of 80.8% at 10 A g −1 . Moreover, the composite delivers good long-term cycling stability with capacitance retention of 91% after 6000 cycles. An asymmetric supercapacitor (ASC) was fabricated using NiMoO 4 @Co 3 O 4 –5H and AC as the positive electrode and negative electrode, achieving the high energy density of 37.1 Wh kg −1 at a power density of 798.0 W kg −1 , and exceptional cycling stability (100% retention after 4000 cycles). These consequences suggest that NiMoO 4 @Co 3 O 4 –5H could be considered as a potential electrode material for energy storage devices. Graphical abstract
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Pengfei Cheng,Fan Dang,Yinglin Wang,Jianning Gao,Luping Xu,Chen Wang,Li Lv,Xu Li,Bao Zhang,Baijun Liu
In this work, hierarchical flower-like Ni-doped Co 3 O 4 was synthesized via a facile one-step coprecipitation method. In the synthesis process, a series of solvent-dependent experiments were carried out to investigate the effect of ethanol/water ratio (R-E/W) on samples. With the increasing ethanol/water ratio, the doping concentration of Ni 2+ increased and the microstructure evolved from micro-leaves to micro-flowers. Additionally, gas sensors based on prepared materials were fabricated to evaluate their gas sensing properties. The comparative analysis illustrated that the sensor based on 5.3 mol% Ni-doped Co 3 O 4 microflowers (R-E/W = 3/30) presented the highest response (8.34) to 100 ppm n-butanol at low optimum temperature (165 °C), with a response/recovery time of 59/63 s, and it also exhibited excellent anti-humidity properties and long-term stability. The unique hierarchical flower-like microstructure and the optimized parameters (catalytic sites, carrier concentration, ratio of Co 2+ , oxygen component) caused by the doping of Ni were responsible for the improved gas sensing performance. Therefore, this work presented a simple solvent-dependent route to controllably synthesize Ni-doped Co 3 O 4 sensing material, and the excellent gas sensing properties of the sensor based on 5.3 mol% Ni-doped Co 3 O 4 microflowers revealed a great application prospect in detecting n-butanol.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 27
·11808-11816
·
IF 3.288
Shi-Yuan Zhang,Jing-Jing Ma,Hong-Lin Zhu,Yue-Qing Zheng
Syngas, as a necessary feedstock dependent on non-renewable fossil fuels, is a mixture of CO and H2, which could be prepared by a renewable strategy via electrochemical CO2 reduction in water electrolyte solutions. Herein, beaded Au@Co3O4 nanowire arrays (denoted as Au@Co3O4 NAs) were obtained by immersion in HAuCl4 solution with Co3O4 nanowire arrays. The Au@Co3O4 NAs exhibited outstanding electrochemical performance of producing syngas via tuning from 1 : 1 to 4 : 1 with controlling voltage. In addition, the Au@Co3O4 NAs showed better catalytic performance for the oxygen evolution reaction with an overpotential of 320 mV at a current density of 50 mA cm−2, along with a small Tafel slope of 75 mV dec−1 in 1 M KOH solution. The electrochemical performance of Au@Co3O4 NAs is obviously superior to Co3O4 NAs, which will open up a viable strategy for the design and fabrication of a bi-functional electrocatalyst for the overall reaction (CO2 + H2O → CO + H2 + O2).
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Journal of Physical Chemistry C
·
2019
·
IF 4.309
Hongyun Dai,Ran Zhang,Min Zhong,Shouwu Guo
As anode materials for lithium-ion batteries, transition metal oxides show usually high theoretic specific lithium ion storage capacities, but their electrical conductivity remains to be improved and their structural pulverizations during lithiation/delithiation need to be suppressed, which affect severely their lithiation/delithiation rate capability and also the cycling stability. Herein, NiO/Co3O4 nanotubes encapsulated with graphene sheets are designed and assembled. It is demonstrated that as anode for lithium-ion batteries, the as-obtained NiO/Co3O4 nanotubes encapsulated with graphene show excellent electrochemical performance, including large lithium ion storage capability (∼1206 mA h g–1 at 0.1 A g–1 after 100 cycles), high rate capability, and cycling stability. The electrochemical kinetics analyses reveal that the tubular structure not only facilitates lithium ion transportation, but also provides even more spaces for lithium ion storage. The external encapsulated graphene sheets can improve the electrical conductivity of NiO/Co3O4 nanotubes, and afford also certain lithium ion storage capacity. Those structural and component factors synergistically account for their improved electrochemical performances.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Mengkang Yu,Yixuan Sun,Haoran Du,Chao Wang,Wen Li,Ruohao Dong,Hongxia Sun,Baoyou Geng
Traditional carbon materials and transition metal oxides are considered as the best candidates due to their respective advantages for the anode materials of lithium ion batteries. Herein, combining the advantages of carbon and transition metal oxides, we fabricate Co 3 O 4 doped hollow hierarchical porous carbon spheres through a simple spray pyrolysis route with cobalt nitrate and glucose as precursors. The wall thickness of hollow porous spheres can be adjusted through the ratio between cobalt nitrate and glucose. The results of electrochemical test show that the optical product maintains an excellent discharge capacity of 1297.1 mAh g −1 after 200 cycles at 0.2 A g −1 when the molar ratio of glucose and cobalt nitrate is 6:8. In addition, the sample has a discharge specific capacity of 841.0 mAh g −1 after 300 cycles at 1 A g −1 . Hollow hierarchical porous structure can efficiently reduce the path of lithium ion transport, and a suitable wall thickness can support the volume change during charge and discharge. Superior charge/discharge capacity, high carbon content, high yield and low cost turn this product into a more promising anode material for lithium-ion batteries.
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