JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Chen Wang,Peng Shi,Chao Guo,Rui Guo,Jiangyuan Qiu
Cobalt-based oxide CuCo 2 O 4 -loaded CuCo 2 O 4 /carbon felt (CF) composite cathodes were synthesized by hydrothermal deposition of a precursor of Cu/Fe oxides on CF followed by roasting in air. The material serves both catalytic and cathodic dual functions in the heterogeneous electro-Fenton (EF) process. Through XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy), XPS (X-ray photoelectron spectroscopy), SEM (scanning electron microscope), and catalytic experiments, it was concluded that CuCo 2 O 4 loading was successful and the highest hydrophilic 180-CuCo 2 O 4 /CF was obtained by varying the hydrothermal temperature without destroying the original structure. 180-CuCo 2 O 4 /CF accomplished 98.03 % degradation in 60 min, and it was found to maintain high degradation capacity in the pH 3 ∼ 9 range in experiments where the experimental parameters were varied. Compared to monometallic oxides, Cu and Co dual active centers are integrated in CuCo 2 O 4 , giving it diverse redox properties and oxidation states. As a result, the CuCo 2 O 4 /CF material can realize the dual function of catalytic and cathodic, which provides a new development direction in practical wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Li Liu,Yuxin Li,Yaqian Pang,Yeqing Lan,Lixiang Zhou
CuCo 2 O 4 @kaolin was successfully synthesized by a sol-gel method and used as a heterogeneous catalyst to activate peroxymonosulfate (PMS) for the degradation of phenacetin (PNT). The results demonstrated that 10 mg/L PNT was completely decomposed by 1 mM PMS activated with 0.1 g/L CuCo 2 O 4 @kaolin within 15 min at initial pH 7. CuCo 2 O 4 @kaolin exhibited the best excellent catalytic performance among the tested catalysts, and the pseudo-first-order rate constants of PNT degradation were CuCo 2 O 4 @kaolin (0.40 min −1 ) > CuCo 2 O 4 (0.22 min −1 ) > Co 3 O 4 @kaolin (0.10 min −1 ) > CuO@kaolin (0.08 min −1 ) > kaolin (0.02 min −1 ). CuCo 2 O 4 @kaolin also possessed superior stability, and the degradation efficiency of PNT declined from 100% in the first round to 80% in the fourth round. Nevertheless, a simple calcinating treatment (20 min) after the third round could restore its catalytic activity substantially and 95% removal of PNT was realized, 15% higher compared to without treatment. OH, SO 4 − , and 1 O 2 were the reactive oxygen species driving the PNT degradation. Based on the results mentioned above, characterizations of CuCo 2 O 4 @kaolin, and intermediates of PNT degradation, the possible pathways and underlying mechanisms of the PNT degradation in the CuCo 2 O 4 @kaolin/PMS system were deduced. CuCo 2 O 4 @kaolin/PMS had a universal degradation potential toward various organic pollutants, and the degradation efficiencies of sulfisoxazole, p -nitrophenol, chloramphenicol, and 2,4,6-Trichlorophenol reached 95–100% within 5–45 min. Thus, this work provides a novel and efficient PMS activator through an eco-friendly synthetic route, and it may be put into practice to degrade organic matter in wastewater.
研究领域:
环境化学
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催化科学
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水处理技术
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环境污染与控制
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材料化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Guobin Miao,Min Zhou,Yuyao Zhang,Zifan Yang,Yueli Liu
Photocatalytic CO 2 reduction has attracted extensive attention because of its abilities to generate renewable clean fuels while immobilizing CO 2 . However, the widely used CO 2 reduction photocatalysts generally have the problems of inadequate light absorption performance and insufficient photocatalytic reaction yield. Here we report 0D/2D CsPbBr 3 quantum dot/CuCo 2 O 4 nanosheet composites (CsPbBr 3 QD/CuCo 2 O 4 NS composites) synthesized by mechanical mixing method, which are applied for photocatalytic CO 2 reduction. Thanks to the narrow bandgaps of CsPbBr 3 QD and CuCo 2 O 4 NS, CsPbBr 3 QD/CuCo 2 O 4 NS composites represent strong light absorption performance. The p-n heterojunction forms between CsPbBr 3 QD and CuCo 2 O 4 NS obviously boosts the charge separation, leading to the photocatalytic activity and stability of CsPbBr 3 QD/CuCo 2 O 4 NS composites significantly exceeding that of CsPbBr 3 QD and CuCo 2 O 4 NS. After 5 h of photocatalytic reaction, the generation rate for CH 4 of CsPbBr 3 QD/CuCo 2 O 4 NS composites is 285.93 μmolg −1 , which is about 3.2 times and 9.2 times higher than CsPbBr 3 QD (88.08 μmolg −1 ) and CuCo 2 O 4 NS (30.92 μmolg −1 ), respectively. This work provides a new insight to construct novel heterojunction photocatalysts based on lead halide perovskite QD, which shows the enhanced photocatalytic activity and light absorption performance.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 29
·16288-16295
·
IF 3.049
Shu-ying Zhen,Hai-tao Wu,Yan Wang,Na Li,Hao-sen Chen,Wei-li Song,Zhen-hua Wang,Wang Sun,Ke-ning Sun
Herein, hollow porous CuO–CuCo2O4 dodecahedrons are synthesized by using a simple self-sacrificial metal–organic framework (MOF) template, which resulted in dodecahedron morphology with hierarchically porous architecture. When evaluated as a cathodic electrocatalyst in lithium–oxygen batteries, the CuO–CuCo2O4 composite exhibits a significantly enhanced electrochemical performance, delivering an initial capacity of 6844 mA h g−1 with a remarkably decreased discharge/charge overpotential to 1.15 V (vs. Li/Li+) at a current density of 100 mA g−1 and showing excellent cyclic stability up to 111 charge/discharge cycles under a cut-off capacity of 1000 mA h g−1 at 400 mA g−1. The outstanding electrochemical performance of CuO–CuCo2O4 composite can be owing to the intrinsic catalytic activity, unique porous structure and the presence of substantial electrocatalytic sites. The ex situ XRD and SEM are also carried out to reveal the charge/discharge behavior and demonstrate the excellent reversibility of the CuO–CuCo2O4 based electrode.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Shan Chen,Xiudan Liu,Shiyuan Gao,Yanchao Chen,Longjun Rao,Yuyuan Yao,Zhiwei Wu
CuCo 2 O 4 was synthesized via a relatively simple method, and innovatively supported onto the activated carbon (AC) by calcination to obtain a novel heterogeneous catalyst (AC-CuCo 2 O 4 ). Brilliant red 3BF (3BF) was selected as the probe compound to investigate the catalytic activity of AC-CuCo 2 O 4 in the presence of peroxymonosulfate (PMS). The results showed that 98% removal rate could be achieved and the reaction rate constant (0.476 min −1 ) was 5.2 times greater than that of CuCo 2 O 4 alone (0.091min −1 ), suggesting that the introduction of AC could greatly enhance the catalytic activity of pure CuCo 2 O 4 . Typically, the 3BF removal was as high as 96% after five cycles, showing the good stability of catalyst reuse. Additionally, the effects of the initial pH, catalyst dosage, PMS concentration and reaction temperature on the 3BF removal were investigated, demonstrating that AC-CuCo 2 O 4 effectively remove 3BF over a wide pH range (5.0–10.0) and possessed temperature-tolerant performance. To further explore the 3BF removal mechanism, electron paramagnetic resonance technology combining with trapping agents was employed to confirm the involvement of reactive oxygen species including SO 4 •− , • OH, O 2 •− and 1 O 2 , which distinctly differed from the reported CuCo 2 O 4 for PMS activation . These findings provided an addition promising strategy in environmental remediation.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2021
·Vol. 27
·期 10
·4473-4482
·
IF 2.817
Huang Tianfu,Qiu Zehai,Hu Zhibiao,Zhang Zhusen
Efficient and low-cost electrode materials play a key role in improving the performance of energy storage device. In this study, the porous rod-like CuCo 2 O 4 nano-materials are synthesized by a simple hydrothermal method and subsequent heating annealing procedure. Benefiting from its advantages of the unique porous rod-like architectures with large specific surface area (98.27 m 2 g −1 ), the as-prepared CuCo 2 O 4 electrode displays a high specific capacitance of 778.29 F g −1 at 1 A g −1 , excellent rate capability (85.79% capacitance retention at 16 A g −1 ), and ultra-long cycling lifespan (91.65% specific capacitance retention after 4000 cycles) through the three-electrode system test. When assembled into the CuCo 2 O 4 //AC-ASC cell device, it provides a maximum energy density of 64.03 Wh/kg at a power density of 800.01 W/kg and extraordinary cycling stability (85.39% retention after 5000 cycles). These results firmly verify that the porous rod-like CuCo 2 O 4 nano-materials have great potential application for supercapacitors.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Junjing Li,Xiuwen Cheng,Huixuan Zhang,Jianfeng Gou,Xinyi Zhang,Di Wu,Dionysios D. Dionysiou
In this study, we designed a plain strategy for fabrication of the novel composite ZnO/CuCo 2 O 4 and applied it as catalyst for peroxymonosulfate (PMS) activation to decompose enrofloxacin (ENR) under simulated sunlight. Compared to ZnO and CuCo 2 O 4 alone, the ZnO/CuCo 2 O 4 composite could significantly activate PMS under simulated sunlight, resulting in the generation of more active radicals for ENR degradation. Thus, 89.2 % of ENR could be decomposed over 10 min at natural pH. Furthermore, the influences of the experimental factors, including the catalyst dose, PMS concentration, and initial pH, on ENR degradation were evaluated. Subsequent active radical trapping experiments indicated that sulfate, superoxide, and hydroxyl radicals together with holes (h + ) were involved in the degradation of ENR. Notably, the ZnO/CuCo 2 O 4 composite exhibited good stability. Only 10 % decrease in ENR degradation efficiency was observed after four runs. Finally, several reasonable ENR degradation pathways were proposed, and the mechanism of PMS activation was elucidated. This study provides a novel strategy by integrating state-of-the-art material science and advanced oxidation technology for wastewater treatment and environmental remediation.
研究领域:
环境科学
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材料科学
·
废水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Zongdeng Wu,Haitao Ye,Bin Zhang,Juanjuan Song,Yang Wang,Di Yao,Chengxin Wang,Xifeng Xia,Wu Lei,Qingli Hao
CuCo2O4, a type of promising lithium-ion storage material, exhibits high electrochemical properties in lithium-ion batteries and enormous economic benefits. However, its practical application is limited by problems such as structural collapse and electrochemical stability during the charging and discharging process. In this work, the reduced graphene oxide (rGO)-coated CuCo2O4 (CuCo2O4/rGO) hollow microspheres were successfully prepared by electrostatic self-assembly. The CuCo2O4/rGO electrode shows an outstanding capability for lithium-ion storage and a remarkable rate capacity, e.g., 445 mA h g–1 at 5 A g–1. After 150 cycles at 0.1 A g–1, the reversible capacity of the CuCo2O4/rGO electrode is as high as 1080 mA h g–1, and it can still retain about 530 mA h g–1 in the 400th cycle at 1 A g–1. The hollow microspheres with mesoporous shells can cause electrolyte penetration into the spherical shell to effectively shorten the transfer distance of lithium ions, and the encapsulation of graphene improves the conductivity and stability of CuCo2O4, which endows CuCo2O4/rGO with a wonderful Li+ storage performance. It is proved that this is an efficient method to improve the electrochemical performance of metal compounds for better applications in energy storage.
研究领域:
材料科学
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能源存储
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2019
·
IF 3.973
Dan Song,Ting Li,Yun-Yun Wei,Zhang-Run Xu
Porous structures with highly dispersed and active catalytic sites are vital to improve the catalytic activity and stability of artificial enzyme-related catalytic reactions. Herein, a novel nanorod-like bimetal-organic framework serving as porous support and supplier of Co 2+ and Cu 2+ was used to prepare a beneficial porous metal oxide. By optimizing the calcination temperature, the composition of calcined product can be controlled and the nanorods with isolated and highly active CuCo 2 O 4 nanoparticles were obtained. The porous CuCo 2 O 4 nanorods exhibit a pH-dependent catalytic property, that is, they behave as oxidase in acid conditions and catalase in alkaline conditions. The CuCo 2 O 4 nanorods perform dual-enzyme catalytic activity superior to monometallic oxides. What’s more, compared with the reported Co 3 O 4 nanoparticles, Co 3 O 4 /CuO hollow nanocage hybrids and NiCo 2 O 4 mesoporous spheres, the porous CuCo 2 O 4 nanorods show higher affinity to 3,3′,5,5′-tetramethylbenzidine with a lower K m value. The superior dual-enzyme catalytic activities of CuCo 2 O 4 nanorods benefit from the high catalytic activity of binary metal oxides and structural stability. After incubating in a wide range of pHs, temperatures and ionic strengths, the catalytic activity of CuCo 2 O 4 nanorods can be maintained. The oxidase activity of CuCo 2 O 4 nanorods can be inhibited in the presence of ascorbic acid, which can be applied in effective detection of ascorbic acid. This study opens a new path to prepare stable and highly active porous artificial enzymes.
研究领域:
材料科学
·
生物催化
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Guijuan Wei,Xixia Zhao,Kun Du,Yiwen Huang,Changhua An,Shujun Qiu,Miao Liu,Shuang Yao,Yue Wu
Flexible asymmetric supercapacitors (FASCs) have attracted increasing interest in portable and wearable electronics. The practical application of FASCs in high energy density devices is limited by their low specific capacity, which can be effectively addressed by designing electrode materials hierarchically on the micro-nanoscale. Herein, well-defined 3D porous hierarchical CuCo 2 O 4 @carbon quantum dots (CQDs) and Fe 2 O 3 @CQDs architectures are rationally synthesized through a simple CQDs-induced hydrothermal self-assembly technique. Both of the as-prepared CuCo 2 O 4 @CQDs and Fe 2 O 3 @CQDs electrodes exhibit improved specific capacity, desirable rate capability and complementary potential range. A FASC (CuCo 2 O 4 @CQDs//Fe 2 O 3 @CQDs) on graphite paper delivers a high operation voltage of 1.55 V, an energy density of 39.5 Wh kg −1 at 1203.7 W kg −1 , and long cycling lifespan. The excellent performance is ascribed to the good electronic conductivity with the assistance of CQDs and their unique 3D mesoporous structures with extraordinary specific surface area, which could provide fruitful active sites for electrochemical reactions . The newly developed FASC based on the Faradaic-type electrodes is inspiring, and would be promising for the applications in wearable electronic devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 4
·2030-2037
·
IF 3.288
Shuai Han,Xiaohan Chen,Yifei Fan,Yuexing Zhang,Zhongdong Yang,Xia Kong,Zhenxue Liu,Qingyun Liu,Xianxi Zhang
High catalytic activity is essential for constructing a rapid and facile colorimetric sensor to determine H2O2 and interrelated biomolecules. CuCo2O4 microspheres were successfully prepared using a facile hydrothermal and pyrolysis method. The excellent peroxidase-like performance of CuCo2O4 microspheres was evaluated by employing a chromogenic substrate, colorless 3,3′,5,5′-tetramethylbenzidine (TMB), which can be catalytically oxidized by H2O2 into a blue ox-TMB product within only 1 min. Fluorescence results reveal that the catalytic activity of CuCo2O4 is attributed to the increasing amount of ˙OH from the decomposition of H2O2 and theoretical simulations by Materials Studio proved that the existence of a large number of oxygen vacancies effectively enhanced the catalytic performance. Based on the high catalytic activity of CuCo2O4 microspheres, a rapid colorimetric sensor with high selectivity has been designed for detecting H2O2 and ascorbic acid. Under optimal reaction conditions, the linear response ranges of H2O2 and AA are 1.00–10.00 mM and 1.00–10.00 μM. The detection limits of H2O2 and AA are 132.70 μM and 0.57 μM, respectively.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Cuiqin Fang,Dong Zhang
Structural supercapacitors can provide load-bearing and energy storage capacities for zero energy buildings. Unfortunately, trade-off between electrical and mechanical performance of cement electrolytes as well as rigid contact of electrolyte/electrode is great challenge. Herein, polyethylene oxide (PEO) is firstly exploited with 5 wt% KOH or LiOTf to fabricate polymer cement electrolytes with various potential windows via hydration synthesis of ordinary Portland cement (OPC). The prepared polymer cement electrolytes with 2 wt% PEO essentially exhibit optimum balance of compressive strength and ionic conductivity. The reduced graphene oxide (rGO)@CuCo 2 O 4 nanowires utilize the excellent capacitance of binary transition metal oxides as well as long term stability of carbon-based material. Subsequently, two structural supercapacitor devices are assembled with the polymer cement electrolytes and rGO@CuCo 2 O 4 nanowires. The device A presents an energy density of 0.2 mWh/cm 2 and areal capacitance of 439.35 mF/cm 2 . The device B delivers an energy density of 0.74 mWh/cm 2 and areal capacitance of 407.07 mF/cm 2 . Consequently, the energy efficiency of the electrodes in device A and device B can achieve 18.1% and 17.0%, respectively. The rational combination of electrode and PEO cement electrolyte for structural supercapacitor device paves the well balance to the integration of zero energy buildings and electrochemical energy storage.
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
危险品化学品经营许可证（带存储）