JOURNAL OF ALLOYS AND COMPOUNDS
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2015
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IF 2.999
Qiang Ru,Xiong Song,Yudi Mo,Lingyun Guo,Shejun Hu
Carbon nanotubes (CNTs) are adopted to modify ZnCo 2 O 4 (ZCO) electrode, and a novel porous polyhedral structure ZCO/CNTs composites are prepared by a facile and scalable hydrothermal process, and the pure ZCO with cubic structure is also synthesized for comparison. The as-prepared materials are characterized by field emission scanning electron microscopy (FESEM). The results demonstrate that the introduced of CNTs has great effects on the nanostructure and electrochemical performance of the samples. The CNTs among the polyhedral structure ZCO/CNTs composites can provide better mechanical robustness, more contact between Li + and electrodes, and more effective electron transmission than the pure ZCO with cubic structure. When tested as anode materials for lithium ion batteries , the ZCO/CNTs composites exhibit a high initial coulombic efficiency of 83.9%, a high specific capacity of ∼864.6 mAh g −1 at a current rate of 100 mA g −1 after 150 cycles, as well as a good rate capability at elevated current rates, such as, ∼924.3 and ∼605.7 mAh g −1 at current rates of 500 and 2000 mA g −1 , respectively. This work would be meaningful in the preparation of complex oxides/carbon composites with porous nanostructure as anodes for LIBs.
研究领域:
材料科学
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电化学
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纳米科技
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能源存储
·
功能材料
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高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Chang Chen,Kwok-ho Lam,Bao-jun Liu,Xian-hua Hou,Yu-ping Wu
Chemically integrated hybrid quantum dots ZnCo 2 O 4 /reduced graphene oxide (QDs ZCO/rGO) sheets nanocomposites are synthesized through polyol processes. rGO sheets grow and interweave to form basic skeletons. Ultrafine ZCO particles with a size of around 3.66 nm grow and embed on both sides of the rGO sheets, and the rGO sheets restrain the reunion of ZCO nanoparticles . The existence of rGO sheets and ZCO nanoparticles can engender the mutual synergistic effects so that hybrid QDs ZCO/rGO electrodes exhibit the excellent electrochemical properties . Owing to this special nanoparticles-on-sheets structure, the hybrid QDs ZCO/rGO electrodes exhibit an excellent initial discharge capacity for rechargeable lithium-ion batteries (1325.9 mAh g −1 at the current density of 200 mA g −1 ), high rate stability (532.3/566.1 mAh g −1 at 4000 mA g −1 ) and outstanding electrochemical cyclic stability (657.6/668.2 mAh g −1 at 2000 mA g −1 after 2000 cycles with a capacity retention of 68.6%). For full-cells, high initial reversible discharging capacity (646 mAh g −1 at 200 mA g −1 ) and good cyclic stability (514 mAh g −1 at 200 mA g −1 after 100 cycles) are obtained. The superior performance of the as-prepared electrodes is ascribed to the advantage of nano-sized particles. With the successful synthesis of hybrid QDs ZCO/rGO nanocomposites, the facile synthetic route and unique growth of nanostructuring method can be extended to high electrochemical performance electrodes for commercial lithium-ion batteries.
研究领域:
材料科学
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电化学
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纳米科技
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能源存储
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功能材料
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先进电池技术
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DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Mingyin Zhu,Yu Wang,Jiake Li,Hedong Jiang,Xin Liu,Pingchun Guo,Hua Zhu,Yanxiang Wang
Photorechargeable supercapacitors were constructed using Mn 2+ - doped ZnCo 2 O 4 as the photoanode, reduced graphene oxide hydrogel (rGH) as the cathode and Zn (CF 3 SO 3 ) 2 as the electrolyte. The physical composition, microstructure, light absorption, chemical structure, and electrochemical performance of the supercapacitors were comprehensively characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HR-TEM), ultraviolet–visible (UV–Vis), X-ray photoelectron spectroscopy (XPS), and electrochemical workstation, respectively. The results show that under the photoelectric synergistic charging conditions (current density of 0.2 A g −1 and light intensity of 95 mW cm −2 ), the specific capacity of the 4 % Mn 2+ -doped ZnCo 2 O 4 //rGH supercapacitor is 256.4 F g −1 , which is 12 % higher than that of the electric charging, and 69 % higher than that of the ZnCo 2 O 4 //rGH supercapacitor. The 4 % Mn 2+ - doped ZnCo 2 O 4 //rGH supercapacitor shows Coulombic efficiency of 100 % for both electric and photoelectric synergistic charging after 10000 cycles, and the capacity retention rate of 78 % and 122 %, respectively, which are 28 % and 22 % higher than that of ZnCo 2 O 4 //rGH supercapacitor at the same conditions, suggesting that the 4 % Mn 2+ - doped ZnCo 2 O 4 //rGH supercapacitor has better photoelectrochemical performance than the ZnCo 2 O 4 //rGH supercapacitor.
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高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 11
·2100125
·
IF 6.147
Wei Si,Haibo Li
In this work, the spinel ZnCo 2 O 4 (ZCO) prepared by a simple strategy is employed for capacitive deionization (CDI) towards enhanced desalination performance. The ZCO reveals typical spherical structure that is beneficial in providing 3D tunnels for ions diffusion. On the basis of electrochemical measurements, the ZCO electrode possesses specific capacitance of 307.9 F g −1 in 1 m NaCl solution at the scan rate of 1 mV s −1 . Remarkably, the equivalent series resistance and the Warburg impedance of ZCO electrode is only 0.54 and 0.66 Ω, respectively. Such low resistivity is conducive to improve the efficiency of charge transfer and the driven energy utilization. Regarding the desalination, the ZCO electrode illuminates the salt removal capacity of 39.4 mg g −1 in 2000 µS cm −1 NaCl solution at 1.2 V. Under the same experimental conditions, the ZCO electrode demonstrates a high desalination capacity of 73.39 mg g −1 with charge efficiency of 76.8% at a constant current of 10 mA g −1 . Moreover, the preferential removal of Na + , K + , and Mg 2+ enabled by ZCO electrode is investigated, suggesting the radius of hydration ions plays a significant role. Beyond that, the analysis on the morphology, crystal phase, and valance state of ZCO electrode at different desalination/salination state are explored to propose the possible desalination mechanism.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 26
·12686-12695
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IF 3.925
Haoyu Jiao,Tingting Feng,Shu Zhang,Mengqiang Wu
The demand for power density has promoted the application of supercapacitors, and one hot study task for supercapacitors is high-energy-density electrode materials, such as transition metal oxides or sulfides. Here, composites of ZnCo2O4/NiCo2S4 (ZCO/NCS) nanosheet arrays on hydrophilic carbon cloth were synthesized and were used in high-performance supercapacitors. The ZCO/NCS composite electrodes were obtained via electrochemical deposition using a mixed solution of MOF-drived ZCO nanoclusters and Ni, Co, S sources. It was found that the acid etching pretreatment for 20 min of the ZIF-8/67 templates would lead to better electrochemical performance of the derived product (labeled as ZCO-20) and the composites with NCS (labeled as ZCO-20/NCS) as well. The effects of deposition conditions on the morphologies and electrochemical properties of the ZCO/NCS products were also investigated. The results showed that the ZCO-20/NCS deposited at −0.9 V for 10 min exhibited a high specific capacitance (2385 F g−1 at 1 A g−1) and excellent rate retention (1868 F g−1 at 10 A g−1, and 990 F g−1 even at 50 A g−1). Further, ZCO-20/NCS was used to assemble a quasi-solid-state asymmetric supercapacitor (ASC) with activated carbon (AC) and PVA/KOH gel electrolyte. ZCO-20/NCS//AC ASC showed a good specific capacitance (161 F g−1 at 1 A g−1 and 131 F g−1 at 10 A g−1), high energy density (57.28 W h kg−1 at 1 A g−1 and 46.50 W h kg−1 at 10 A g−1), high power density (8.0 kW kg−1 at 10 A g−1) and good cycle retention (91.5% after 5000 cycles). Thereby, ZCO-20/NCS could serve as a promising supercapacitor electrode material in the future.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Hongyu Ma,Xi Wu,Xinghua Li,Jie Liu,Haipeng Dong,Yu Liu,Luyao Niu,Fang Zhang,Wenbo Wang,Changlu Shao,Xiaowei Li,Yichun Liu
Photocatalytic carbon dioxide (CO2) reduction for high-value hydrocarbon fuel production is a promising strategy to tackle global energy demand and climate change. However, this technology faces formidable challenges, primarily stemming from low yield and poor selectivity of C2 products of the desired hydrocarbon fuels. This study reported ZnO/ZnCo2O4 Janus hollow nanofibers (ZnO/ZCO JHNFs) prepared by electrospinning and atomic layer deposition. Photocatalytic tests revealed an ethanol yield of 4.99 μmol g–1 h–1 for ZnO/ZnCo2O4 JHNFs, surpassing mixed ZnO/ZnCo2O4 nanofibers (ZnO/ZCO NFs) by 4.35 times and pure ZnO by 12.7 times. The selectivity of 58.8% is 2.38 and 4.49 times higher than those of ZnO/ZnCo2O4 NFs and ZnO, respectively. These enhancements are attributed to efficient carrier separation facilitated by the ordered internal electric field of the Z-scheme heterojunction interface, validated by the energy band evaluations from experimentation and density functional theory (DFT) simulations and charge separation characterizations of photocurrent, impedance, and photoluminescence spectra. The Janus structure also effectively exposes the surface of ZnCo2O4 to CO2 molecules, increasing the active site availability, as confirmed by BET nitrogen adsorption/desorption, temperature-programmed desorption tests, and DFT adsorption energy calculations. This study proposes a novel approach for efficient photocatalytic hydrocarbon fuel production, with potential applications in energy and climate crisis mitigation.
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DOI
PubMed
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2025
·
IF 1.9
Ruxin Li,Guanghui Zhang,Liwen Wang,Tianyu Fang,Wenjuan Huang
Porous materials can enhance the diffusion path and active site exposure of gas molecules by virtue of their rich surface area and unique microstructure, thus showing excellent practical performance in gas sensors. ZnCo 2 O 4 spinel material with porous structure is successfully prepared by self-propagating high-temperature synthesis (SHS), and its morphology, structure, and specific surface area are characterized. Experimental results demonstrate that the porous ZnCo 2 O 4 exhibits high sensitivity (5.34–100 ppm), a low detection limit (1 ppm), strong selectivity, and excellent reproducibility for ethanol detection at 150 °C. The enhanced sensing performance primarily stems from the material's porous architecture and substantial surface area advantage.
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Chemosensors
·
2025
·Vol. 13
·期 7
·239
·
IF 3.7
Hongtao Wang,Yang Liu,Yuanchao Xie,Jianan Ma,Dan Han,Shengbo Sang
Mesoporous ZnO/ZnCo2O4nanocomposites with excellent gas-sensing performance were synthesized using the Ostwald ripening method. The as-prepared ZnO/ZnCo2O4comprised aggregated monodisperse nanoparticles, and the nanoparticle size grew with increasing thermal treatment temperature. Increasing the calcination temperature did not significantly change the overall size of the ZnO/ZnCo2O4nanocomposites, but the pore size and specific surface area were noticeably affected. The gas-sensing results showed that ZnO/ZnCo2O4composites calcined at 500 °C exhibited the highest response to H2S at 200 °C, with a detection limit of 500 ppb. The ZnO/ZnCo2O4composites also exhibited remarkable selectivity, response/recovery speed, and stability. Their excellent gas-sensing performance might be attributed to their porous structure, large specific surface area, and the heterogeneous interface between ZnO and ZnCo2O4. This work not only represents a new example of the Ostwald ripening-based formation of inorganic hollow structures in a template-free aqueous solution but also provides a novel and efficient sensing material for the detection of H2S gas.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2024
·
IF 2.6
Li Gang,Ren Haifang,Geng Chunping,Wu Xiang
Electrical energy storage devices (EES) play an important role in the development of portable electronic devices, power grids, and electric vehicles. Supercapacitors (SCs) become the focus of the EES field due to their high power density and high energy density. ZnCo 2 O 4 ternary metal oxides show considerable potential as electrodes for SCs. In this work, Ni(OH) 2 and PPy materials are combined on the surface of ZnCo 2 O 4 samples. The synthesized products possess a specific capacitance of 1256 C/g at 1 A/g and an energy density of 69 Wh/kg at 1350 W/kg. Moreover, the assembled device retains 81% of its capacity after being fully charged and discharged 10,000 times.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xin Li,Yunzhuo Zhang,Yue Cheng,Xujun Chen,Wenhu Tan
Metal-organic framework (MOF)-derived ZnCo 2 O 4 was synthesized by utilizing the template agent 2-methylimidazole, zinc and cobalt nitrate by an easy solvothermal process followed by annealing for the first time. The porous hierarchical ZnCo 2 O 4 microstructure possesses a microflower structure assembled by 3D nanosheets . The obtained flower-like structure has abundant open spaces between nanosheets , which allows for facile gas diffusion while providing plentiful active sites for gas adsorption . The hierarchical ZnCo 2 O 4 microflower-based sensor exhibits a high response of 32.32 and fast response/recovery rates (2.6/8.8 s) at 200 °C to 100 ppm acetone gas. In addition, the porous hierarchical ZnCo 2 O 4 microflower-based sensor has a detection limit below 50 ppb with a response of 2.51 to acetone gas. The excellent sensing performance of this porous hierarchical structure-based sensor is ascribed to the good gas accessibility of the microflower morphology with a high specific surface area, small particle size and highly porous structure . This work explores an efficient way to synthesize MOF-derived bimetallic oxides with microflower structures assembled by 3D nanosheets for gas sensing applications.
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 12
·7009-7019
·
IF 2.047
Ma Xin,Ying Zhihua,Wen Fei,Li Lili,Zheng Xiaolong,Zheng Peng,Wang Gaofeng
Since cobalt-containing spinel oxides have good prospects for the detection of toxic gases, they also have great potential for applications in the field of gas sensors. However, ZnCo 2 O 4 -based gas sensors have the disadvantages of low response values and poor selectivity in formaldehyde detection. In this study, we attempted to prepare formaldehyde gas sensors by varying the addition of sodium citrate for hydrothermal synthesis of ZnCo 2 O 4 . During the fabrication process, it was found that an appropriate amount of sodium citrate content could produce ZnO on the surface of ZnCo 2 O 4 , and that the gas sensitivity of ZnO-ZnCo 2 O 4 to formaldehyde was better compared to that of pure ZnCo 2 O 4 . The sensor has a response rate of 17 at 20 ppm formaldehyde at 200°C. It also has good selectivity, repeatability, and stability. These results can provide foundational knowledge for the implementation of spinel oxide materials in the field of gas sensors.
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VACUUM
·
2020
·
IF 2.906
Yujing Yang,Cui Yang,Kai Tao,Qingxiang Ma,Lei Han
Ternary metal oxide , such as ZnCo 2 O 4 has attracted widespread attention as electrode material for supercapacitors owing to its high theoretical activity and rich redox reactions arising from the synergistic effects between two different metal species. However, the compromised electrochemical performance due to low electronic conductivity and deficient active sites of ZnCo 2 O 4 impedes its practical applications. Herein, S-doped ZnCo 2 O 4 microspindles (denoted as S-ZnCo 2 O 4 ) have been obtained by simple hydrothermal synthesis followed by calcining and sulfurization treatments. It is indicated that the doping of S results in the formation of defects and disorders without altering the crystalline structure of ZnCo 2 O 4 , which is beneficial for charge transfer, and exposing more active sites. Taking advantage of the desired structure and composition, the S-ZnCo 2 O 4 displays superior electrochemical properties when acting as an electrode material for supercapacitors. It delivers a high specific capacity of 214.1C g −1 (522 F/g) at the current density of 0.5 A g −1 , which is almost 8.5 times that of the ZnCo 2 O 4 (25 C g −1 , 61 F/g). Moreover, the S-ZnCo 2 O 4 also shows good rate capability (82% at 10 A g −1 ) and excellent electrochemical stability (78% retention after 5000 cycles). This work demonstrates that anion doping can be an efficacious strategy of boosting electrochemical performance.
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