JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Xin Guo,Menggang Li,Yequn Liu,Yarong Huang,Shuo Geng,Weiwei Yang,Yongsheng Yu
Rational construction of MnCo 2 O 4 -based core-shell nanomaterials with distinctive and desirable architectures possesses great potential in the advanced electrode material of high-performance supercapacitors. Here, a new class of hierarchical core-shell nanowire arrays (NWAs) with a shell of NiWO 4 nanoparticles and a core of MnCo 2 O 4 nanowires is reported, which can significantly improve the electrochemical energy storage properties of supercapacitors. The unique core-shell structure endows the MnCo 2 O 4 @NiWO 4 NWAs electrode with a high areal specific capacitance of 5.09 F cm −2 at a current density of 1 mA cm −2 and a superior cyclic retention of 96% after 5000 charge-discharge cycles, which are more preferable than those of MnCo 2 O 4 NWAs electrode. More importantly, an aqueous electrochemical energy storage device (core-shell MnCo 2 O 4 @NiWO 4 NWAs as the positive electrode and active carbon as the negative electrode, MnCo 2 O 4 @NiWO 4 //AC ASC) was assembled and shows a high energy density of 0.23 mWh cm −2 at a power density of 2.66 mW cm −2 , and 0.09 mWh cm −2 at 16.00 mW cm −2 , indicating hopeful potential for practical applications. This work highlights the significance of NiWO 4 as a shell for hierarchical core-shell nanostructures, which can further improve the electron transport characteristic of the electrode material, thereby achieving performance breakthroughs in energy storage devices.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xueyue Mi,Yi Li,Xingming Ning,Jinhu Jia,Haitao Wang,Yuguo Xia,Yan Sun,Sihui Zhan
The emergence of antibiotics in the environment, especially in drinking water, poses potential harm to human health. It’s urgent to develop effective methods to remove antibiotics in drinking water. In this work, a series of mesoporous Mn x Co 3−x O 4 nanoparticles with high surface area were successfully synthesized and firstly used as effective stable electro-Fenton catalysts to degrade ciprofloxacin (CIP). The removal of CIP achieved to 100% within 5 h. Experimental and density functional theory (DFT) studies verified the existence of redox pairs of Mn 2+ /Mn 3+ and Co 2+ /Co 3+ . Scanning electrochemical microscopy (SECM) results suggested that the redox reaction capacity of MnCo 2 O 4 was enhanced and the electron transfer rate on the surface of this bimetallic oxide was 2.67 and 1.6 times the number of MnO 2 and Co 3 O 4 , respectively. The effective degradation of CIP was mainly associated with the increased electron transfer rate and advanced redox reactivity owing to the synergistic effect of manganese and cobalt entrapped in the matrix of mesoporous structure which provided more accessible active sites. The degradation intermediates and possible process mechanism were investigated in detail. The reusability of MnCo 2 O 4 -CF cathode was evaluated five cycles with minimal ion leaching which the concentration of Mn and Co in the system was lower than 2.5 and 3.4 ppm, respectively. This work provides further understanding for removal process of organic pollutants by investigation of redox couple and electron transfer rate of the promising MnCo 2 O 4 -CF cathode.
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高影响因子
ChemSusChem
·
2019
·Vol. 13
·期 7
·1890-1899
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IF 7.804
Jie Zhu,Guolin Cao,Yuan Zhou,Yunjiao Li,Junchao Zheng,Dianwei Zhang
Graphical Spray pyrolysis and a solvothermal method were used to prepare two types of NiO–MnCo 2 O 4 –Ni 6 MnO 8 hybrid anode materials to compare their physical and electrochemical properties. The samples had similar hierarchical nanostructures, but that prepared by the solvothermal method had a smaller and more uniform particle size and larger BET surface area whereas those prepared by spray pyrolysis exhibited more regular morphology and more stable surface chemical states. New materials with different morphologies, nanostructures, and components can have structural advantages for application in materials science. Multicomponent-active hybrid nanostructured materials are among the best candidates for application in electrode materials. Spray pyrolysis and solvothermal synthesis are two popular methods for the preparation of multicomponent-active hybrid nanostructured materials. In this study, the two types of NiO-MnCo 2 O 4 -Ni 6 MnO 8 hybrid anode materials for use in lithium-ion batteries were synthesized by two different methods (spray pyrolysis and solvothermal synthesis), and the differences in their physical and electrochemical properties were compared. The two types of anode material exhibited the same hierarchical hybrid composition, but some different physical characteristics, which affected their electrochemical performance.
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高影响因子
JOURNAL OF POWER SOURCES
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2016
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IF 6.333
Chang Chen,Borui Liu,Qiang Ru,Shaomeng Ma,Bonan An,Xianhua Hou,Shejun Hu
Cubic Spinel MnCo 2 O 4 /graphene sheets (MCO/GS) nanocomposites are synthesized by a facile hydrothermal method with a subsequent annealing process . Nano-sized MnCo 2 O 4 particles are evenly embedded in paper-like graphene sheets , possessing a unique nanoparticles-on-sheets hybrid nanostructure , with particle size around 20–50 nm. Owing to the special nanoparticles-on-sheets structures, MCO/GS nanocomposites have an outstanding electrochemical performance for rechargeable energy storage devices. As an anode material for lithium-ion batteries, MCO/GS electrodes exhibit high reversible discharge capacities (1350.4 mAh g −1 at the initial rate of 100 mA g −1 ), excellent rate capability (462.1 mAh g −1 at a current rate of 4000 mA g −1 ) and outstanding cycling performance (584.3 mAh g −1 at 2000 mA g −1 after 250 cycles). Meanwhile, as an anode material for sodium-ion batteries, MCO/GS electrodes also exhibit comparably promising electrochemical characteristics. Greatly improved electrochemical properties can be assigned to the special advantageous nanostructures. Besides, the existence of graphene sheets is beneficial to the transportation of ions/electrons during battery operation. The outstanding electrochemical performance demonstrates that the lithium/sodium storage capability of MCO/GS nanocomposites is highly promising for high-capacity 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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无机非金属材料
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高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Kaixin Xie,Xiaobo Chen
In the pursuit of advanced energy storage solutions, materials featuring high porosity, robust redox activity, and abundant electrochemically accessible sites are highly attractive candidates for next-generation supercapacitor electrodes. In this study, a binder-free positive electrode material consisting of porous MnCo 2 O 4 particles directly coated onto carbon cloth (MnCo 2 O 4 @CC) was synthesized via a straightforward hydrothermal process followed by thermal treatment. Additionally, the incorporation of redox additives into electrolytes has been identified as a promising approach to elevate electrochemical supercapacitor performance. To this end, we designed an aqueous asymmetric supercapacitor (ASC) system utilizing MnCo 2 O 4 @CC and activated carbon (AC) electrodes, where potassium ferricyanide (K 3 [Fe(CN) 6 ], denoted as KFCN) was introduced as an electrolyte additive to augment pseudocapacitive behavior. The electron migration mechanisms and charge storage dynamics of MnCo 2 O 4 @CC in a KOH + KFCN electrolyte were systematically investigated. The MnCo 2 O 4 @CC electrode immersed in a 3 M KOH + 0.05 M KFCN solution exhibited a high specific capacitance of 2206.7 F g −1 at 1 A g −1 , along with low resistance characteristics and exceptional cycling durability. A complete aqueous MnCo 2 O 4 @CC//KOH + KFCN//AC ASC was assembled, demonstrating enhanced specific capacitance, extended cycle life (94.5% capacitance retention after 10,000 cycles), and an ultrahigh energy density of 79.9 Wh kg −1 at 799.6 W kg −1 . These findings provide significant electrochemical insights and demonstrate the great potential of the MnCo 2 O 4 @CC-KOH + KFCN system for next-generation supercapacitor applications.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Yu Liu,Xiumei Chen,Huachen Lin,Pengjie Zhou,Yulong Ying
It is an important method to enhance the electrochemical performance of metal oxide electrode by phosphorus doping in the research of high-performance hybrid supercapacitors . Herein, we obtain a P-doped carbon nanotubes (CNT)@MnCo 2 O 4 /Co 3 O 4 film by an in-situ synthesis and subsequent phosphating. By introducing P heteroatoms, the electronic structure of MnCo 2 O 4 /Co 3 O 4 can be effectively modulated, thereby improving the electrical conductivity and increasing Faraday reaction. The electrochemical tests show that the capacity and rate performance of CNT@MnCo 2 O 4 /Co 3 O 4 have been significantly improved after phosphorus doping. The P-CNT@MnCo 2 O 4 /Co 3 O 4 electrode displays an acceptable specific capacitance of 1064.4 F g −1 . Furthermore, a supercapacitor P-CNT@MnCo 2 O 4 /Co 3 O 4 //activated carbon possesses 46.4 W h kg −1 of energy density at 800 W kg −1 . After 10000 repeated tests, the device keeps 85.0 % of the original capacitance. The above results show that the P-doped CNT/metal oxide film we designed has some inspiration on the design of energy storage electrode materials.
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高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
Xiaobo Chen,Wei Wang,Xin Pan,Chengqun Qiu
Hierarchical core-shell nanowire arrays with a shell of CuCo 2 O 4 nanosheets and a core of MnCo 2 O 4 nanowires directly coated on the conductive carbon cloth (CC) are rationally designed and synthesized via a facile hydrothermal route with a post low-temperature thermal treatment in air. The binder-free MnCo 2 O 4 @CuCo 2 O 4 /CC composite material exhibits an enhanced performance (1241.0 C g −1 at 1 A g −1 ) compared with the MnCo 2 O 4 /CC (832.7 C g −1 at 1 A g −1 ) and CuCo 2 O 4 /CC (734.1 C g −1 at 1 A g −1 ). In addition, the MnCo 2 O 4 @CuCo 2 O 4 /CC electrode is assembled into a flexible all-solid-state asymmetric supercapacitor (ASC), which delivers a maximum specific energy of 62.0 Wh kg −1 at a specific power of 747.2 W kg −1 with 91.2% capacity retention after 10000 charge–discharge cycles at 8 A g −1 . And the ASC device also exhibits 91.7% capacity retention at floating time over 200 h at 8 A g −1 . Further, the MnCo 2 O 4 @CuCo 2 O 4 //AC device shows superior flexible performance while bending at various angles. These results make this MnCo 2 O 4 @CuCo 2 O 4 core/shell composite to be a good candidate for flexible all-solid-state electrochemical capacitors applications.
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高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Yaqiang Ji,Jinqi Xie,Jian Wu,Ying Yang,Xian-Zhu Fu,Rong Sun,Ching-Ping Wong
Cu wires are coated by porous/dense Ni bi-layers as current collectors through electroless plating and hydrogen bubble dynamic template electrodepostion methods. The unique coaxial composite current collectors can be beneficial from the high electrical/thermal conductivity of metal Cu core and high corrosion resistance of dense metal Ni coating as well as porous Ni substrate for growth of active materials. Furthermore, the metal wire current collectors have excellent flexibility and mechanical strength . Highly flexible solid-state fiber supercapacitors are then fabricated by binder-free integrated electrodes of hierarchical MnCo 2 O 4 nanothorns grown on porous/dense Ni bi-layers coated Cu wires. The fiber supercapacitors reach capacitance of 20.6 mF cm −1 (54.8 mF cm −2 ) and energy density of 4.8 μWh cm −1 (12.8 μWh cm −2 ) at a power density of 32.25 μW cm −1 (110 μW cm −2 ). Moreover, the twist fiber supercapacitors show good rate capability and cycling stability. The outstanding performances of the fiber supercapacitors might be attributed to the hierarchically nanothorns MnCo 2 O 4 active materials and the unique porous/dense Ni coated Cu wire current collectors. Our results can provide a novel strategy to design flexible nanostructure fiber supercapacitors for energy storage applications in future wearable electronics .
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高影响因子
FOOD CHEMISTRY
·
2026
·
IF 10.4
Nguyen Ngoc Huyen,Ngo Xuan Dinh,Vu Thi Huong Mai,Phung Thi Lan Huong,Nguyen Duc Toan,Nguyen Anh Son,De Pham-Cong,Van Tan Tran,Hoang Van Tuan,Nguyen Quang Hoa,Pham Duc Thang,Anh-Tuan Le
This study reports the carbendazim (CBZ) detecting capability of spinel cobaltite MnCo 2 O 4 (MCO) synthesized via a microwave-assisted hydrothermal approach. The MCO-modified screen-printed electrode (MCO/SPE) exhibited excellent electrocatalytic activity toward CBZ oxidation. As a result, the proposed sensor enables sensitive CBZ detection over two distinct linear ranges (0.05–5 μM and 25–500 μM), with a low detection limit of 0.02 μM and a high sensitivity of 6.46 μA μM −1 cm −2 . The enhanced sensing performance is attributed to the synergistic redox activity of Co 2+ /Co 3+ and Mn 2+ /Mn 3+ couples, which enhance both electrical conductivity and catalytic activity, together with the nanorod morphology that promotes efficient diffusion of CBZ molecules and electrolyte species. The applicability of the MCO/SPE was further validated through effective CBZ detection in fruit and vegetable samples as compared with the liquid chromatography–tandem mass spectrometry (LC-MS/MS) method, showing strong potential for food safety monitoring.
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PubMed
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Hao Shi,Haozhen Li,Xing Zhou,Chongqing Yang,Hengyong Tu,Jun Tong,Longkai Xiang,Chao Ma,Lei Zhu,Zhen Huang
Spinels have been widely employed as contact layers (CLs) on metallic interconnects for solid oxide cells (SOCs) with the required electrical conductivity and Cr block ability. In this work, MnCo2O4 spinels doped with different transition metals (Cu, Ni, and Zn) were deposited on precoated SUS441 stainless steel as CLs. A positive doping effect of Cu and Ni on increasing the concentration of Mn4+/Mn3+ and Co3+/Co2+ hopping pairs was observed, whereas a negative doping effect of Zn on electrical conductivity was confirmed, which was reflected in the data of X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectra (XAS). The Cu-doped Mn1Co1.7Cu0.3O4 spinel exhibited the best electrical conductivity with a low area specific resistance (ASR) value of 4.5 mΩ·cm2 at 850 °C. A relative degradation test demonstrated that Mn1Co1.7Cu0.3O4 maintained significant performance during a 200 h isothermal process. Cross-sectional observations revealed that the thickness of the Cr oxide scale formed during the degradation test was much reduced by the Mn1Co1.7Cu0.3O4 CL, which was attributed to the improved resistance to Cr oxidation. The present work shed light on the design of highly conductive CLs in SOCs.
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高影响因子
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