SOLID STATE IONICS
·
2023
·
IF 3.2
Liming Chen,Bin Tang,Haoyue Li,Bohan Wang,Bin Huang
Microstructure design and constructing heterojunctions are of great value for transition metal oxides to realize a high-performance electrode for lithium-ion batteries (LIBs). In this paper, monodisperse porous SnO 2 /Co 3 O 4 nanocubes anchored onto graphene is fabricated. The SnO 2 and Co 3 O 4 phases in the composite are detected by X-ray diffraction. Scanning electron microscopy and transmission electron microscopy are employed to gain insight into the microstructure of the nanocubes, which are composed of tightly contacted SnO 2 and Co 3 O 4 particles with a size range from 100 to 200 nm. X-ray photoelectron spectroscopy reveals that SnO 2 and Co 3 O 4 are chemically bound together. Four samples of pure SnO 2 , pure Co 3 O 4 , SnO 2 /Co 3 O 4 nanocubes, and SnO 2 /Co 3 O 4 /rGO composite are compared in electrochemical properties . The excellent rate performance, cycling stability, and reversible specific capacity result from the synergistic effect of the unique microstructure and the function of the high conductive graphene framework in Li ion storage.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Junfang Ding,Liping Li,Haorui Zheng,Ying Zuo,Xiyang Wang,Huixia Li,Shaoqing Chen,Dan Zhang,Xingliang Xu,Guangshe Li
Nanomaterials are widely used as redox-type reaction catalysts, while reactant adsorption and O2 activation are hardly to be promoted simultaneously, restricting their applications in many important catalytic fields such as preferential CO oxidation (CO-PROX) in H2-rich stream. In this work, an interface-enhanced Co3O4–CuCoO2 nanomesh was initially synthesized by a hydrothermal process using aluminum powder as a sacrificial agent. This nanomesh is systematically characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N2 adsorption, X-ray photoelectron spectroscopy, UV–vis absorption spectroscopy, Raman spectroscopy, X-ray absorption near-edge spectroscopy, hydrogen temperature-programmed reduction, and oxygen temperature-programmed desorption. It is demonstrated that the nanomesh possesses high-density nanopores, enabling a large number of CO adsorption sites exposed to the surface. Meanwhile, electron transfer from O2– to Co3+/Co2+ and the weakened bonding strength of Co–O bond at surfaces promoted the oxygen activation and redox ability of Co3O4. When tested as a catalyst for CO-PROX, this nanomesh with an optimized pore structure and a surface electronic structure, exhibits a strikingly high catalytic oxidation activity at low temperatures as well as a broader operation temperature window (i.e., CO conversion >99.0%, 100–200 °C) in the CO selective oxidation reaction. The present finding should be highly useful in promoting the quest for better CO-PROX catalysts, a hot topic for proton exchange membrane fuel cells and automotive vehicles.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 7
·3228-3237
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IF 10.733
Yu Ouyang,Haitao Ye,Xifeng Xia,Xinyan Jiao,Guangmin Li,Sadaf Mutahir,Liang Wang,Daniel Mandler,Wu Lei,Qingli Hao
Binder-free electrodes with core–shell structures have shown great potential in a variety of important energy storage systems. In order to endow the core–shell hierarchical structure with enhanced electrochemical properties, rationally designed and fabricated hierarchical structures with controllable morphology and great electrical conductivity are highly desired. In this work, a uniform dendritic S-Co3O4@NiCo2S4 hierarchical structure grown on Ni foam was successfully designed and synthesized via sulfur-doping of Co3O4 (S-Co3O4) as the inner core with enhanced conductivity. The hierarchical electrode exhibited high areal capacity (10.9 mA h cm−2 at a current density of 8 mA cm−2), a good rate performance (72.5% retention after increasing the current densities from 8 to 30 mA cm−2), and excellent cycling stability (97.3% retention after 5000 cycles). Moreover, a hybrid energy storage battery-supercapacitor device, constructed from a S-Co3O4@NiCo2S4 positive electrode and an active carbon (AC) negative electrode, showed high energy density and power density. Contributing to short ion diffusion, large electroactive sites and low contact resistance, our work not only demonstrates a promising electrode for energy storage battery-supercapacitor hybrid (BSH) devices, but also provides an attractive strategy for the design of electrode materials.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Jing Sui,Changqian Feng,Tao Yan,Jie Wang,Zongzhao Li,Jianguang Feng,Xiaolei Gao,Hongzhou Dong,Liyan Yu,Lifeng Dong
In this study, Co 3 O 4 /Co nanoparticles are synthesized within nitrogen-doped porous carbon/carbon nanotube matrix (Co 3 O 4 /Co@NC/CNT) by using ZIF-67 metal-organic frameworks. In comparison with commercial Pt/C catalysts, the composite exhibits better electrocatalytic characteristics for oxygen reduction reactions in alkaline media, such as onset potential, half-wave potential, current density, cycle stability, and methanol tolerance. For instance, onset potential and half-wave potential are positively shifted by 67 mV and 25 mV, respectively. Structural and composition analysis demonstrate that enhanced properties result from the formation of pyridinic nitrogen and Co-N-C active sites within carbon matrix. The findings above indicate that the Co 3 O 4 /Co@NC/CNT catalyst can replace expensive Pt/C catalyst for potential applications in fuel cells and metal-air batteries .
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高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 45
·16305-16312
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IF 4.099
Xiaoqiang Du,Hui Su,Xiaoshuang Zhang
With the increasing energy demand and environmental pollution, hydrogen production by water splitting is one of the best ways to solve the energy shortage. Three-dimensional (3D) hierarchical Co3O4@Co3S4/NF was first synthesized directly in situ, grown on the nickel foam through a simple hydrothermal process, and the anion-exchange reaction and the Ostwald ripening mechanism were investigated by adjusting the reaction time. The oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activities of Co3O4@Co3S4/NF-24 h were investigated, and the required overpotentials were 270 mV and 143 mV, when the current density was 100 mA cm−2 and 20 mA cm−2, respectively. Subsequently, the overall water splitting activity of Co3O4@Co3S4/NF-24 h was investigated; when the current density was 10 mA cm−2, the low cell voltage was 1.53 V, which, to our knowledge, was among the smallest values reported for electro-driven water splitting so far. This high catalytic activity is attributed to the construction of the O–S interface and the increased electron transfer rate at the beginning of the reaction. Through XRD, SEM and XPS characterization, it is proven that Co3O4@Co3S4/NF-24 h is relatively stable and is expected to be an efficient and stable water splitting catalyst.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2018
·
IF 2.179
Shi-Yuan Zhang,Yuan-Yuan Yang,Yue-Qing Zheng,Hong-Lin Zhu
Electrocatalytic reduction of CO 2 to useful fuels or chemicals is a promising path for carbon recycling. In this study, a novel mixed-metallic MOF [Ag 4 Co 2 (pyz)PDC 4 ][Ag 2 Co(pyz) 2 PDC 2 ] was synthesized, and it transformed into Ag doped Co 3 O 4 catalyst, which exhibits excellent electro-catalytic performance for reduction of CO 2 in water to syngas (H 2 + CO). The as-prepared Ag/Co 3 O 4 material exhibits a high selectivity of CO in 0.1 M KHCO 3 aqueous solution (CO 2 saturated) with the corresponding faradaic efficiency up to 55.6%. Compared with the Ag/Co 3 O 4 electrode, the maximum faradaic efficiency (FE) of CO of pure Co 3 O 4 is 21.3% at − 1.8 V vs. SCE. The results show that the presence of Ag can improve the efficiency of CO significantly, thereby inhibiting the production of H 2 . The stability of the samples can be maintained for more than 10 h at − 1.8 V vs. SCE. The ratio of production between H 2 and CO can be controlled by varying the potential values.
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 41
·23397-23403
·
IF 2.936
Zhuo-Liang Jiang,Jing Xie,Cong-Shan Luo,Meng-Yang Gao,Huan-Liang Guo,Mo-Han Wei,Hong-Jun Zhou,Hui Sun
The mechanism of Li–O2 batteries is based on the reactions of lithium ions and oxygen, which hold a theoretical higher energy density of approximately 3500 W h kg−1. In order to improve the practical specific capacity and cycling performance of Li–O2 batteries, a catalytically active mechanically robust air cathode is required. In this work, we synthesized a freestanding catalytic cathode with RuO2 decorated 3D web Co3O4 nanowires on nickel foam. When the specific capacity was limited at 500 mA h g−1, the RuO2–Co3O4/NiF had a stable cycling life of up to 122 times. The outstanding performance can be primarily attributed to the robust freestanding Co3O4 nanowires with RuO2 loading. The unique 3D web nanowire structure provides a large surface for Li2O2 growth and RuO2 nanoparticle loading, and the RuO2 nanoparticles help to promote the round trip deposition and decomposition of Li2O2, therefore enhancing the cycling behavior. This result indicates the superiority of RuO2–Co3O4/NiF as a freestanding highly efficient catalytic cathode for Li–O2 batteries.
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高影响因子
Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-10
·
IF 2.833
Xu Zhiqiang,Liu Wei,Yang Yuanyi,Sun Lijuan,Deng Yi,Liao Li
In this work, we developed an eco-friendly strategy for preparing Co 3 O 4 nanowires. The process consisted of two steps: controllable synthesis of metal cobalt nanowires followed by a facile air-oxidization step. The 1D nanowire structure with a high aspect ratio was easily achieved via a magnetic-field-assisted self-assembly of cobalt ion complexes during reduction. After air-calcinations, the Co 3 O 4 nanowires were prepared in large scale and ready to be used as the anode material for lithium-ion batteries. The Co 3 O 4 nanowires, which possessed a length ranging from 3 to 8 μm with the aspect ratio more than 15, exhibited a reversible lithium storage capacity up to ~ 790 mAh/g when using a small amount of defect-free graphene flakes as conductive additives. The superior electrochemical performances were ascribable to the synergistic “flat-on” effect between the 1D nanowires and the 2D graphene. Therefore, the Co 3 O 4 nanowire/graphene composite holds promising application for lithium-ion batteries.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 86
·54460-54467
·
IF 3.108
Xiaoyun Lin,Yanfang Wang,Wenhui He,Yongnian Ni,Serge Kokot
Nanostructured Co3O4 with near-cubic morphology was synthesised using the solvothermal method, and a non-enzymatic electrochemical glucose sensor (Co3O4–CuNPs/Pt) was successfully constructed by dropping and potentiostatic depositing technologies. The obtained Co3O4 and Co3O4–CuNPs were characterised and investigated by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. Quantitative analysis of glucose was performed using the amperometric (i–t) method, and a plot of current difference versus concentration of glucose was linear in the range 0.5–336 μM, with a linear correlation coefficient (R2) of 0.9989 and limit of detection (LOD) of 0.43 μM. When the linear range was reduced to 0.5–76.5 μM, R2 and LOD were 0.9997 and 0.17 μM, respectively. The sensitivity of the sensor was evaluated as 3.58 × 104 and 4.03 × 104 μA μM−1 cm−2 for the above two linear ranges, respectively. This novel sensor produced satisfactory reproducibility and stability and was applied to monitor trace amounts of glucose in human serum samples.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 48
·20296-20303
·
IF 2.7
Wenting Tong,Zhichao Ma,Shulin Zhang,Apei Jiang,Ming Wei,Jianhua Jia,Wenbo Lu
The quantitative detection of food additives containing sunset yellow is of great significance to food safety. In this study, a simple, low-cost, and sustainable pencil graphite electrode modified with Co3O4@biochar is proposed for the accurate detection of sunset yellow in beverages. Absorbent cotton is selected as the biological carbon source, which is immersed in cobalt salt and then pyrolyzed in air to achieve the preparation of nanocomposite Co3O4@biochar (Co3O4@BC-700). The successful synthesis of Co3O4@BC-700 is confirmed by XRD, SEM, TEM, XPS and BET. It is gratifying that the Co3O4@BC-700 modified pencil graphite electrode enables the electrochemical quantitative detection of sunset yellow with a linear range of 5.0 × 10−6–4.0 × 10−3 M, a detection limit as low as 1.3 × 10−6 M, and a cost as low as 0.5 Yuan per electrode. It also has excellent selectivity, stability and repeatability. This electrochemical sensor based on Co3O4@biochar can be employed for the concentration detection of sunset yellow in beverages. This work attempts to provide a novel path for the electrochemical detection of food additives.
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Small
·
2024
·
IF 13
Ming Li,Haixin Sun,Chen Wang,Yongzhuang Liu,Qinqin Xia,Juan Meng,Haipeng Yu,Shuo Dou
The electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) represents an environmentally friendly approach to generate high-value-added chemicals from biomass. The successful electrochemical transformation of HMF during the oxidation reaction (HMFOR) necessitates an ideal adsorption interaction between HMF and OH − on the electrode surface. Yet, catalysts with a singular active site offer limited flexibility in managing the competitive adsorption of HMF and OH − . To this end, different active sites are customized in this work to construct a P and N co-doped porous carbon that wrapped Co 3 O 4 (Co 3 O 4 @PNC). Co-doping with these two heteroatoms generates C 3 P = O and pyrrolic N as adsorption sites to better balance the adsorption of HMF and OH − , respectively, rather than promoting competition between the HMF and OH − on a single active site. With this design strategy, Co 3 O 4 @PNC demonstrates significant HMFOR activity, the conversion rate of HMF surpassed 99% with a 2,5-furandicarboxylic acid (FDCA) yield exceeding 95% after 2 h of electrolysis. Furthermore, it shows universal applicability in the electrooxidation of other alcohol/aldehyde substrates, yielding efficiencies of 90–99%. This work not only provides guidance for advanced electrocatalysts design toward alcohol/aldehyde oxidation but also offers insights into the utilization of biomass-derived platform chemicals.
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Molecular Catalysis
·
2024
·
IF 3.9
Xintong Li,Min Gao,Shenglong Li,Zhichuan Yang,Xin Zhao,Yu Liu
The combination of quantum dots (QDs) with carbon materials has garnered significant attention as electrocatalysts owing to their exceptional catalytic activity and robust thermodynamic stabilities. The present study utilizes bio-based mesoporous carbon as a carbon source to synthesize QDs carbon nanostructures (Co 3 O 4 /BMC -400 ) through hydrothermal and carbonization methods. Due to the abundance of active sites and limited availability of Co, the size of Co particles is confined to the QDs level, ranging from 2 to 3 nm. The anodic oxidation reaction of the Co 3 O 4 /BMC -400 was investigated in freshwater, seawater, and urea. The prepared Co 3 O 4 /BMC -400 exhibits an oxygen evolution reaction overpotential of 235 mV at 10 mA cm −2 in 1.0 M KOH. The catalytic activity is reduced as a result of the competitive oxidation and corrosion caused by chloride ions in seawater. For the urea oxidation reaction, Co 3 O 4 /BMC -400 exhibits superior catalytic performance, requiring only a potential of 1.371 V at 10 mA cm −2 , while exhibiting remarkable long-term stability for up to 30 h. More significantly, in comparison to Co 3 O 4 nanosheets and nanoparticles, QDs can effectively reduce the transport pathways of alkali metal ions, thereby affording an increased number of catalytic active sites while simultaneously enhancing stability and prolonging service life. These findings may facilitate further exploration of metal-QDs/carbon materials in a wide range of electrocatalytic application.
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