CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jiawei Long,Tianli Han,Mengfei Zhu,Xiaoyong Xu,Jinjin Li,Junjie Niu,Jinyun Liu
Lithium-sulfur battery cathodes still remain a challenge on capacity decay due to the shuttle effect even though a series of strategies have been tried. Here we report a novel matryoshka-like CuS@void@Co 3 O 4 architecture of double micro-cubes ( μ -cubes) that locks sulfur between the CuS core and the Co 3 O 4 shell. Plenty of existing spaces between the μ -cubes suffice a high loading of sulfur and volumetric accommodation. The robust, double closed cubes configuration greatly enhances the confinement of polysulfides . In parallel, the CuS core increases the electronic conductivity and contributes to additional capacity, while the Co 3 O 4 shell ensures a better interface activity. A high Li + ion diffusion coefficient is obtained during the sulfur and lithium sulfide transformation. The constructed battery displays an initial capacity up to 1480 mAh g −1 , and a Coulombic efficiency (CE) exceeding 99%. A capacity retention higher than 500 mAh g −1 with a CE larger than 99.8% after cycling 400 times at 0.2 C are achieved. In addition, under a temperature of −5 °C, a high capacity of 700 mAh g −1 at 0.2 C after 200 cycles is achieved, indicating a good low-temperature tolerance.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Xurong Qiao,Chao Ma,Xiao Chang,Xiaofang Li,Kun Li,Lei Zhu,Fujun Xia,Qingzhong Xue
One-dimensional cobalt oxide (Co 3 O 4 ) exhibits great potential in gas sensing, but the application is severely hindered because of the agglomeration or close packing during the normal synthesis process. Herein, 3D radial Co 3 O 4 assembled with nanorods is fabricated by employing cobalt-based layered hydroxide metal salt (Co-LHMS) as a self-template. Meanwhile, Co 3 O 4 with flake floral and dumbbell radial structure obtained by tuning the hydrothermal reaction time of precursors is used as a control group for gas sensing tests. The sensitivity of 3D radial Co 3 O 4 to sub-ppm acetone is 4 times higher than other structures and the detection limit is 100 ppb at a relatively low working temperature of 200 ℃, which is excellent among intrinsic acetone sensors based on pure Co 3 O 4 . The satisfactory gas sensing performance can be ascribed to the large specific surface, numerous transmission pathways, and low grain boundary resistance of the material. Furthermore, this work provides an idea for the further improvement of one-dimensional gas sensors.
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高影响因子
ANALYST
·
2020
·Vol. 146
·期 2
·605-611
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IF 3.978
Jie Lv,Cong Zhang,Shuangling Wang,Meng Li,Wei Guo
Sensitive detection of copper ions (Cu2+) in biological samples is extremely important since an abnormal level of Cu2+ is linked with many diseases. Herein, we demonstrated a novel turn-on colorimetric sensor for selective detection of Cu2+ both in buffered solution and serum samples based on porous bimetallic transition metal oxide nanocages (ZnO-Co3O4 NCs) as peroxidase mimics. The ZnO-Co3O4 NCs were prepared by using ZnCo-zeolitic-imidazolate-framework (ZnCo-ZIF) as precursors via direct calcination. With the high peroxidase-like activity, the obtained ZnO-Co3O4 NCs can catalyze the oxidation of tetramethylbenzidine (TMB) in the presence of H2O2 to form a blue colored product. The inhibition effect of cysteine (Cys) on the catalytic activity of ZnO-Co3O4 NCs and its strong binding ability toward Cu2+ enabled the ZnO-Co3O4 NCs/Cys system to be utilized for sensitive detection of Cu2+, in which the catalytic activity of ZnO-Co3O4 NCs/Cys can be recovered by the introduction of Cu2+ with an obvious color change of the solution. The linear range for Cu2+ determination was 2 to 100 nM with a detection limit of 1.08 nM. More importantly, this colorimetric sensor has been successfully applied to detect Cu2+ in serum without pretreatment. Our findings are expected to expand the scope of application of nanozyme and shed light on early disease diagnosis.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Ziyin Yang,Xiao Bai
This paper reports the synthesis of S-doped thin Co 3 O 4 shell with Au flower as core for nonenzymatic glucose sensing, where Au@Co 3 O 4 was obtained through assembly process triggered by redox reaction of Co 2+ and Au 3+ , and then S was doped into Co 3 O 4 shell via a hydrothermal process. The morphology, composition and structure of Au@Co 3 O 4 -S were characterized by transmission electron microscopy and X-ray diffraction, which showed that the core–shell structure was composed with Au core flower and S-doped thin Co 3 O 4 shell. Electrochemical property of Au@Co 3 O 4 -S toward glucose was explored, and an excellent electrocatalytic performance with a wide linear range of 0.2 μM–3.1 mM, a high sensitivity of 1127.3 μA mM −1 cm −2 and a low detection limit of 0.09 μM (S/N = 3) was obtained, which may be due to that the low conductivity of Co 3 O 4 was mitigated by conductive Au core flower and S doping, therefore making thin Co 3 O 4 shell provide more effective active sites for glucose reaction. Considering such excellent results, Au@Co 3 O 4 -S was proven as a promising material for electrochemical sensing of glucose.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Li Liu,Yunong Li,Wei Li,Ruixue Zhong,Yeqing Lan,Jing Guo
Co 3 O 4 –SnO 2 /rice straw biochar (RSBC) was prepared for the first time via calcining oxalate precipitation precursor dispersed on the surface of RSBC and used as a catalyst for activating PMS to degrade sulfisoxazole (SIZ). The results demonstrated that Co 3 O 4 –SnO 2 /RSBC possessed much better catalytic performance than Co 3 O 4 , Co 3 O 4 –SnO 2 , Co 3 O 4 /RSBC, and SnO 2 /RSBC, which is ascribed to the synergy of Co 3 O 4 , SnO 2 and RSBC. Approximately 98% of SIZ (50 mg/L) was decomposed by PMS (1 mmol/L) activated with Co 3 O 4 –SnO 2 /RSBC (0.1 g/L) within 5 min. The optimal degradation efficiency of SIZ was realized at the initial pH 9. Co 3 O 4 –SnO 2 /RSBC also displayed remarkable stability and reusability, and the degradation rate of SIZ maintained over 90% even after the fifth recycle run. The electron paramagnetic resonance (EPR) technique and quenching experiments proved singlet oxygen ( 1 O 2 ) to be the main reactive oxygen species (ROS) responsible for the SIZ decomposition in the Co 3 O 4 –SnO 2 /RSBC/PMS system. On the basis of the characterization analysis, the identification of the ROS and the SIZ degradation products , the possible mechanism and pathways of the SIZ degradation by a combination of PMS and Co 3 O 4 –SnO 2 /RSBC were further proposed. This study provides not only a new insight into non-radical mechanism for the heterogeneous activating PMS over Co 3 O 4 –SnO 2 /RSBC to degrade organic pollutants but also an eco-friendly synthetic route for exploring novel and efficient catalysts.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Chongyue Jin,Min Wang,Zhilin Li,Jin Kang,Yan Zhao,Jin Han,Zengmin Wu
In this study, to improve peroxymonosulfate (PMS)-mediated visible-light photocatalytic performance of g-C 3 N 4 in antibiotics degradation and elucidate its mechanism, an ultrathin Co 3 O 4 nanomeshes/g-C 3 N 4 nanosheets 2D Z-scheme heterojunction composite (x% Co 3 O 4 /g-C 3 N 4 ) was successfully prepared calcining the mixtures of MOF-Co ultrathin nanosheets and g-C 3 N 4 . This unique nanomeshes/nanosheets structure with large SSA (153.92 m 2 /g) possessed an abundance of accessible active sites and large area intimate interfaces between Co 3 O 4 and g-C 3 N 4 , thus remarkably promoting the separation and transport of charge carriers. The as-prepared optimal 10% Co 3 O 4 /g-C 3 N 4 composites exhibited excellent degradation efficiency toward tetracycline (TC) under visible light irradiation and were further enhanced with the addition of PMS. The mechanism of the enhanced TC degradation in Co 3 O 4 /g-C 3 N 4 /Vis/PMS system was investigated in detail based on the characterization of the catalysts, TC degradation efficiency assessment, electron paramagnetic resonance (EPR) measurements, and reactive oxygen species (ROSs) quenching results. The TC degradation pathway was proposed based on the intermediates identified by the gas chromatography-mass spectrometer (GC–MS) measurements. This study provides a facile and promising path for the remediation of contaminated water via PMS mediated photocatalysis over highly active g-C 3 N 4 -based catalysts.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 26
·12091-12102
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IF 3.553
Sheng Peng,Tao Shi,Gao Xiaorui,Tan Yongjian,Wu Dajun,Qian Bin,Chu Paul K.
Cobalt carbonate hydroxide possesses interesting capacitive properties due to the unique crystal structure. Herein, the hierarchical Co 3 O 4 @Co 2 (CO 3 )(OH) 2 dendritic structure was fabricated on carbon cloth with Co 3 O 4 nanoneedles as the inner core to enhance the conductivity. The loading efficiency of Co 2 (CO 3 )(OH) 2 nanowhiskers had improved obviously, and the nanowires provided more electrochemical sites to facilitate the superior electrochemical energy storage capacity of supercapacitor. The dendritic electrode with the core–shell structure had a high area-specific capacitance (1541 mF cm −2 at 1 mA cm −2 ), good rate capacitance (only 18.1% specific capacitance lost when the current density increased to 5 mA cm −2 ), as well as better electrochemical cycle stability (a capacitance retention of 72.1% after 5000 cycles at a high current density of 5 mA cm −2 ). The dendritic Co 3 O 4 @Co 2 (CO 3 )(OH) 2 and activated carbon as cathode and anode, respectively, were used to assemble an asymmetric supercapacitor, possessing the better area-specific capacitance of 87 mF cm −2 as well as well-deserved longevity retaining approximately 97.3% of initial capacitance even after 10,000 cycles at 1 mA cm −2 . The excellent properties stemmed from electro-active sites galore, strong adhesion between the core and shell, superior conductivity, as well as excellent ion transfer. The novel materials and feasible strategy are promising for next-generation hybrid supercapacitor with high performance.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Run Huang,Yanfei Li,Yonghai Song,Li Wang
Here, free-standing lithium-ion batteries (LIBs) anodes were fabricated through using flexible N-doped carbon foam (NCF) derived from melamine foam as substrate and current collector based on triethylamine (TEA)-assisted burning of Co(CO 3 ) 0·5 OH/NCF in air. The burning not only achieved the simple transformation from Co(CO 3 ) 0·5 OH to porous Co 3 O 4 nanorods which were arrayed on NCFs evenly, but also maintained the flexibility and integrity of NCF. The as-obtained NCF/Co 3 O 4 composites had a robust three-dimensional framework and porous structure, which improved the electron/ion transfer, enhanced contact area with electrolyte and prevented the volume inflation in discharging/charging process. In the combusting process, TEA was transformed into N and carbon atom coating on NCF and Co 3 O 4 nanorods, and eventually formed cross-linked NCF frame helpful to stabilize Co 3 O 4 nanorods. When the NCF/Co 3 O 4 composites were applied directly as free-standing LIBs’ anode, it had a higher loading mass of ∼2.5 mg cm −2 compared to traditional anode. In addition, the low charge transfer impedance and easy separation caused by the addition of traditional inactive materials were eliminated. Therefore, the flexible porous NCF/Co 3 O 4 anode without any conductive additives and binders showed the discharge capacity of 576 mAh g −1 at 1 A g −1 after 300 cycles and excellent rate capability.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 1
·211-219
·
IF 3.925
Yulin Xin,Shixiang Lu,Wenguo Xu,Shasha Wang
Hydrothermal synthesis and annealing process were used to create a honeycomb-structured composite electrode material on nickel foam substrate that contained praseodymium oxide (Pr2O3), cobalt oxide (Co3O4), and reduced graphene oxide (rGO) (named as Pr2O3/Co3O4/rGO/NF). The Pr2O3/Co3O4/rGO/NF (PCGN) composite electrode material was created without the need for a binder and can be employed right away to create a supercapacitor. This honeycomb composite is further grown by the mesh structure of Pr2O3 and Co3O4, which has good electrical conductivity. This nanomorphology not only improves the specific surface area of the material but also facilitates the improvement of electron transfer efficiency. The synthesized electrode material has excellent electrochemical properties due to its special morphology and excellent conductivity, and its performance is better than that of praseodymium oxide and cobalt oxide alone, with a specific capacitance of 3316 F g−1 in the three-electrode system at a current density of 1 A g−1. After forming a symmetrical supercapacitor device, the energy density is 74.8 W h kg−1 and the power density is 300 W kg−1 at 0.5 A g−1. The capacitance retention is 82% even after 35 000 cycles at 2 A g−1.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Youlian Zhu,Guangtao Wei,Jiahao Ma,Linye Zhang,Chen Xu,Yu Huang,Dingyi Xu
In this work, a flower-like structure and oxygen vacancies (OVs) enriched bentonite-based Co 3 O 4 (Co 3 O 4 /Bent) was successfully prepared, and then was applied as a new activator of peroxymonosulfate (PMS) to degrade lomefloxacin hydrochloride (LOMH). The characterization results demonstrated that Co 3 O 4 /Bent had a flower-like structure, high Co(Ⅱ)/Co(III) ratio and high OVs content. The optimal composite of Co 3 O 4 /Bent held a high catalytic activity in LOMH degradation, and approximately 87.2 % of LOMH (30 mg/L) could be degraded at 60 min by using Co 3 O 4 /Bent (0.2 g/L) to activate PMS (3.0 mmol/L). And the quenching experiments revealed that 1 O 2 , ·OH, SO 4 ·- and ·O 2− were the active species and 1 O 2 played a main role in the LOMH degradation process. The possible degradation pathways were revealed based on DFT calculation and LC-MS analysis. This work suggested that the Co 3 O 4 /Bent composite was an efficient catalyst to activate PMS to treat LOMH in wastewater.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shifeng Tan,Meiling Fan,Wenmao Tu,Duxin Zhang,Qi Li,Ziyi Xu,Xiaoyu Yang,Hongfei Pan,Haining Zhang
Development of a simple method for synthesizing transition metal-based bifunctional catalysts is of great importance in the context of oxygen-involved electrochemical energy conversion and storage devices. In this effort, electrochemical catalysts consisting of amorphous cobalt and cobalt oxides on graphene oxide (GO) were fabricated using a solvothermal process followed by etching ZIF-67 with oxygen-rich functional groups on GO (≈ 29 at. %) in a weak reduction atmosphere at 400 ℃. During the calcination process forming the ZIF-67@GO-based materials, exposed cobalt metal centers are created by partial vaporization and oxidation of ZIF-67. Also, metal ions are reduced to form Co and partially combine with oxygen from GO to generate amorphous Co 3 O 4 . Moreover, the porous framework structure of ZIF is retained under the mild calcination temperatures used. Benefiting from their porous framework and heteroatoms-doped composition, the ZIF-67@GO-based materials have low overpotentials of 319 mV at 10 mA cm −2 and high catalytic activities toward the oxygen evolution and oxygen reduction reactions in an alkaline electrolyte. In addition, the liquid zinc-air battery assembled with the ZIF-67@GO composite produced at a calcination temperature of 400 ℃ displays a high performance. Overall, the results demonstrate that the ZIF-67@GO composites have the potential to be high-performing catalysts in energy conversion devices. The readily controllable and high-yielding calcination method in this study is expected to serve as a model for new strategies to synthesize low-cost and efficient bifunctional electrocatalysts.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Feng Zhou,Jiadong Chen,Yun Yang,Xiaofeng Ke,Xue Liu,Lijie Zhang,Jun Li,Huile Jin,Shun Wang,Ying Li,Chenliang Su
Development of Ru-based electrocatalysts for acidic oxygen evolution reaction without a trade-off between activity and durability remains challenging. Herein, we constructed Co 3 O 4 /RuO 2 heterojunctions anchored on carbon (Co 3 O 4 /RuO 2 -C) with a low Ru loading (2.74 wt%), in which strong coupled p-n junctions facilitated electron transfer from RuO 2 to Co 3 O 4 . The Co 3 O 4 /RuO 2 -C demonstrated a low overpotential of 170 mV at 10 mA cm −2 and long-term stability in 0.1 M HClO 4 due to its unique structure. The origin of its high performance in acidic OER was revealed by the combination of in-situ attenuated total reflection infrared and Raman tests. Concretely, oxygen generation for Co 3 O 4 /RuO 2 -C was dominated by the adsorbate evolution mechanism, and the introduction of Co 3 O 4 facilitated the redox of RuO 2 , generating active sites for OER. Theoretical calculations further substantiated that the Co 3 O 4 /RuO 2 heterojunctions possessed lower energy barriers for OER. This work provides a compelling synthesis route for effective and stable electrocatalysts for acidic OER.
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高影响因子
危险品化学品经营许可证（带存储）