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.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
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.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 26
·12686-12695
·
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.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
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.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
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.
研究领域:
材料科学
·
化学传感器
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Wangchang Geng,Pengfei Song,Libing Duan,Tingyue Luan
Metal-organic frameworks (MOFs)-derived metal oxides have a high specific surface area and porous structure, making them promising for gas sensing applications. In this paper, MOFs-derived In 2 O 3 /ZnCo 2 O 4 composites were synthesized using a two-step solvothermal method. Through a series of characterization strategies, it is revealed that the morphology of the In 2 O 3 /ZnCo 2 O 4 composites consists of hollow microtubes and microflowers. The gas sensing performance of In 2 O 3 /ZnCo 2 O 4 composites was significantly enhanced compared to pure In 2 O 3 . Among them, the In 2 O 3 /ZnCo 2 O 4 -2 sensor exhibited superior performance towards 100 ppm n -butanol gas, with a lower operating temperature of 200℃, a higher response value of 208.7, a lower detection limit of 4.2 ppb, shorter response/recovery times of 152 s/223 s, higher selectivity, and better repeatability. Furthermore, the improved gas response can be attributed to the utilization of MOFs as self-sacrificial templates, the high specific surface area of the sensing materials, and the formation of p-n heterojunctions. This study provides a valuable reference for synthesizing n -butanol sensing materials with a high specific surface area, strong response, and excellent selectivity.
研究领域:
材料科学
·
化学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 35
·14767-14778
·
IF 3.5
Xuan Liao,Hang Yang,Xiaolong Hou,Caini Yi,Ying Yang,Guimao Wang,Shuo Wang,Yuping Liu,Changguo Chen,Danmei Yu,Xiaoyuan Zhou
To overcome the disadvantages of poor intrinsic conductivity and stability of ZnCo2O4, a ZnCo2O4@MnMoO4 composite as an emerging pseudocapacitor electrode material with high specific capacitance, environmental friendliness, morphological diversity, and unique hierarchical structure was synthesized via a simple two-step hydrothermal method. The research results indicate that the ZnCo2O4@MnMoO4 composite can present a high specific capacity of 1628 F g−1 at a current density of 1 A g−1 and good cycling stability with 69% capacity retention after 10 000 cycles at 10 A g−1. Hybrid supercapacitors (HSCs) assembled with the ZnCo2O4@MnMoO4 cathode and activated carbon anode can deliver an energy density of 48 W h kg−1 at a power density of 695 W kg−1, and their capacity retention reached 61% after 8000 charge–discharge cycles at a current density of 10 A g−1. This could be attributed to the synergistic effect of the specific surface area and electrical conductivity enhanced by compositing ZnCo2O4 with MnMoO4. As a result, the excellent electrochemical properties show that the ZnCo2O4@MnMoO4 composite has strong application potential for high-performance supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE CHEMICAL LETTERS
·
2018
·
IF 2.631
Jun Chen,Jing Zhan,Yumeng Zhang,Yiwei Tang
A novel ZnCo 2 O 4 /Bi 2 O 3 heterojunction photocatalyst was prepared, and the formation of the heterojunction was confirmed via HRTEM . Photocatalytic activity of as-prepared samples was evaluated through photodegradation of malachite green (MG). The degradation results show that the as-prepared 13% ZnCo 2 O 4 /Bi 2 O 3 heterojunction photocatalyst exhibits higher activity than pure Bi 2 O 3 . The MG degradation rate for the as-prepared catalyst is as high as 94%. The enhanced photocatalytic activity is mainly attributed to the broad photoabsorption and low recombination rate of photogenerated electron-hole pairs, which is driven by the photogenerated potential difference formed at the ZnCo 2 O 4 /Bi 2 O 3 heterojunction interface.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
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.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 69
·39377-39383
·
IF 2.936
Huan Liu,Xinlu Wang,Hang Xu,Jinxian Wang,Qianli Ma,Wensheng Yu,Ying Yang,Xiangting Dong,Guixia Liu,Yan Zhao
Nanostructured ZnCo2O4 anode materials for lithium-ion batteries (LIBs) have been successfully prepared by a two-step process, combining facile and concise electrospinning and simple post-treatment techniques. Three different structured ZnCo2O4 anodes (nanoparticles, nanotubes and nanowires) can be prepared by simply adjusting the ratio of metallic salt and PVP in the precursor solutions. Charge–discharge tests and cyclic voltammetry (CV) have been conducted to evaluate the lithium storage performances of ZnCo2O4 anodes, particularly for ZnCo2O4 nanotubes obtained from a weight ratio 2 : 4 of metallic salt and PVP polymer in the precursor solution. Remarkably, ZnCo2O4 nanotubes exhibit high specific capacity, good rate property, and long cycling stability. Reversible capacity is still maintained at 1180.8 mA h g−1 after 275 cycles at a current density of 200 mA g−1. In case of rate capability, even after cycling at the 2000 mA g−1 current density, the capacity could recover to 684 mA h g−1. The brilliant electrochemical properties of the ZnCo2O4 anodes make them promising anodes for LIBs and other energy storage applications.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
ENERGY
·
2017
·
IF 4.52
Le Xu,Yan Zhao,Jiabiao Lian,Yuanguo Xu,Jian Bao,Jingxia Qiu,Li Xu,Hui Xu,Mingqing Hua,Huaming Li
Porous ZnCo 2 O 4 nanostructures with hexamethylenetetramine (HMT) as adscititious alkali are fabricated via a facile hydrothermal route and heat treatment process . The morphology of the materials can be easily tuned from nanowires to nanobelts by simple varying the hydrothermal temperature. Due to the superiority of the porous nanostructure and the convenient ion transport, the obtained ZnCo 2 O 4 nanostructures are further applied as electrode materials for supercapacitors and exhibit noticeable pseudocapacitive performance with high specific capacitance of 776.2 F g −1 at 1 A g −1 and good cycle stability (84.3% capacity retention at 3 A g −1 ). Moreover, a high-voltage asymmetric supercapacitor using the ZnCo 2 O 4 as the anode assembled with the freeze-dried reduced graphene oxide (F-RGO) cathode displays superior electrochemical performance with an ultrahigh energy density (84.48 Wh kg −1 at 0.4 kW kg −1 ), which reveals a great promise for practical application in electrochemical devices.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）