ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Haolun Li,Mingxin Lyu,Yanhua Lai,Xingxing Cheng,Zhen Dong
Spinel oxides are widely used to enhance photoanodes’ photoelectrochemical (PEC) water oxidation performance. In this paper, we demonstrate that a p-type photothermal MnCo2O4 layer, inserted between BiVO4 and FeOOH cocatalysts, can significantly enhance PEC performance. On the one hand, the charge recombination is greatly suppressed since p-type MnCo2O4 can form a p–n heterojunction with n-type BiVO4. On the other hand, upon near-infrared (NIR) light irradiation, the deposited MnCo2O4 shows excellent photothermal conversion performance that can further facilitate charge transfer and accelerate the water oxidation process by elevating the operating temperature. In addition, the FeOOH cocatalyst is introduced to fully utilize the holes reaching the surface and further enhance the surface oxygen evolution kinetics. Consequently, the carefully constructed BiVO4/MnCo2O4/FeOOH photoanode shows excellent photocurrent (4.71 mA cm–2) at 1.23 V vs RHE (VRHE) and superior applied bias photon-to-current efficiency (1.62%) at 0.6 VRHE. The photocurrent density maintains more than 90% of the initial photocurrent after 4 h of combined solar and NIR light irradiation. Enhancing the PEC catalytic activity of photoelectrodes using photothermal materials is a simple and effective strategy, which can be used to explore PEC activity enhancement in other photoelectrodes.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xuanbing Wang,Junli Wang,Wenhao Jiang,Chen Chen,Bohao Yu,Ruidong Xu
In industrial zinc electrowinning, the anodic oxygen evolution reaction (OER) has sluggish kinetics leading to ultrahigh overpotential and energy consumption. Herein, a sandwich-like MnCo 2 O 4 modifying PbO 2 composite electrode was fabricated via chemical-bath-deposition and electrodeposition. Consequently, the synthesized PbO 2 electrode exhibits low Tafel slope of 0.17 V per decade and an operating potential of 1.68 V vs. SCE for 500 A m −2 in a simulated solution containing 150 g L −1 H 2 SO 4 and 50 g L −1 Zn 2+ . Compared with traditional Pb-0.76Ag alloy, the overpotential at 500 A m −2 decreased by 357 mV, which ascribe to the incorporation of MnCo 2 O 4 minoring crystal grain size and charge transfer resistance and enlarging active surface area. Furthermore, the composite electrode shows robust durability as long as 95 h at 15,000 A m −2 in 0.5 M H 2 SO 4 electrolyte. Hence, this study offers a facile synthesis route to prepare composite electrodes for zinc electrowinning and provides deep insight into the relationship among modifying substances, microstructures, and electrocatalytic activity.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2017
·Vol. 10
·期 5
·2218-2225
·
IF 7.367
Menggang Li,Weiwei Yang,Ji Li,Ming Feng,Weili Li,Haibo Li,Yongsheng Yu
The development of new electrode materials with various components, structures, morphologies and porosities is critical for improving the performance of supercapacitors. Here, we report a facile strategy for synthesizing porous layered stacked MnCo2O4 cubes through a hydrothermal method, followed by annealing treatment. Compared with other morphologies of MnCo2O4, the specific capacitance of porous layered stacked MnCo2O4 cubes reaches 480.5 F g−1 at a current density of 1 A g−1. Furthermore, porous layered stacked MnCo2O4 cubes show an ultrahigh capacity retention of 75.7% even at a current density of 25 A g−1 and good cycling stability with 96.6% specific capacitance retained after 3000 cycles, which makes porous layered stacked MnCo2O4 cubes a great potential electrode material for supercapacitor applications.
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
BIOSENSORS & BIOELECTRONICS
·
2014
·
IF 6.451
Yuting Zhang,Shuai Liu,Yu Li,Dongmei Deng,Xiaojing Si,Yaping Ding,Haibo He,Liqiang Luo,Zhenxin Wang
Graphene decorated MnCo 2 O 4 composite nanofibers (GMCFs) were synthesized by electrospinning and subsequent calcination in an Ar atmosphere . The structural and morphological characterizations of GMCFs were performed using X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy , energy-dispersive spectroscopy, scanning electron microscopy and transmission electron microscopy . The synthesized GMCFs combine the catalytic activity of spinel-type MnCo 2 O 4 with the remarkable conductivity of graphene. In addition, electrospinning can process MnCo 2 O 4 materials into nanosized architectures with large surface area to prevent magnetic nanoparticles from aggregating. The obtained GMCFs were applied as a novel platform for glucose biosensing. Electrochemical studies show that the developed biosensor exhibits excellent electrocatalytic activity towards glucose oxidation over a wide linear range of 0.005–800 µM with a low detection limit of 0.001 µM.
研究领域:
材料科学
·
生物传感器
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Liming Guo,Xin Wan,Jieyuan Liu,Xu Guo,Xiaofang Liu,Jiaxiang Shang,Ronghai Yu,Jianglan Shui
Synergistic effects have been applied to a variety of hybrid electrocatalysts to improve their activity and selectivity. Understanding the synergistic mechanism is crucial for the rational design of these types of catalysts. Here, we synthesize a MnCo2O4/Co–N–C hybrid electrocatalyst for the oxygen reduction reaction (ORR) and systematically investigate the synergy between MnCo2O4 nanoparticles and Co–N–C support. Theoretical simulations reveal that the synergy is closely related to the distance between active sites. For a pair of remote active sites, the ORR proceeds through the known 2e- + 2e- relay catalysis while the direct 4e– ORR occurs on a pair of adjacent active sites. Therefore, the formation of the undesired byproduct (H2O2) is inhibited at the interface region between MnCo2O4 and Co–N–C. This synergistic effect is further verified on an anion-exchange membrane fuel cell. The findings deepen the understanding of synergistic catalysis and will provide guidance for the rational design of hybrid electrocatalysts.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Ranran Ding,Zhenhua Li,Chengyang Wang,Mingming Chen
In this work, yolk-shell MnCo 2 O 4 -TiO 2 microspheres were synthesized by a solvo-thermal method combined with a subsequent kinetic-controlled coating. The as-fabricated MnCo 2 O 4 -TiO 2 -50 composite shows remarkable electrochemical performance as an anode material for lithium-ion batteries, with a high specific capacity, superior cycle stability and excellent rate capabilities. At a current density of 100 mA g −1 , the composite exhibits a reversible specific capacity of 1271.5 mA h g −1 for up to 200 cycles, exhibiting stable cyclic performance. The outstanding electrochemical performance of MnCo 2 O 4 -TiO 2 -50 microspheres is due to its rational composition and structure. The porous yolk-shell structure buffers the volume change of the electrode material during charging/discharging, whereas the MnCo 2 O 4 core and TiO 2 shell synergistically assure stable cycling and satisfactory specific capacity.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xinxin Han,Hongyan Sun,Chunju Xu,Jiang Zhu,Huiyu Chen
Herein, porous MnCo 2 O 4 with disc-like (MnCo 2 O 4 -discs) and ring-like (MnCo 2 O 4 -rings) microstructures were respectively synthesized using an initial hydrothermal method at different temperatures and a calcination treatment in air. The electrochemical properties of these MnCo 2 O 4 materials were investigated in three-electrode and two-electrode systems, and as such, MnCo 2 O 4 presented a battery-like electrochemical response. The specific capacity of MnCo 2 O 4 -discs was determined to be 296.1C/g at 1 A/g, superior to 246.3C/g for MnCo 2 O 4 -rings. An asymmetric supercapacitor (ASC) was assembled with MnCo 2 O 4 as the cathode and activated carbon (AC) as the anode to evaluate the potential for practical application. The MnCo 2 O 4 -discs//AC ASC exhibited an energy density ( E d ) of 35.8 W h kg −1 at a power density ( P d ) of 927.5 W kg −1 . For the MnCo 2 O 4 -rings//AC ASC, an inferior E d of 31.4 W h kg −1 under 890.9 W kg −1 was achieved. Furthermore, the two ASCs presented outstanding cyclic performance after 5000 cycles at 6 A/g. The exceptional properties of MnCo 2 O 4 microstructures can be applied to the assembly of ASC devices, which can have promising potential for application in electrochemical energy storage. This synthetic method is straightforward, cost-effective, and can be extended to fabricate similar electrode materials with superior electrochemical performance.
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
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Chunqiang Lu,Rongrong Deng,Ruidong Xu,Yannan Zhao,Xing Zhu,Yonggang Wei,Kongzhai Li
Chemical looping combustion (CLC) is a novel technology that offers effective CO 2 capture and power generation, which strongly relies on the properties of oxygen carrier. Here, a new type of CeO 2 /MnCo 2 O 4 oxygen carrier was prepared by dispersing CeO 2 nanoparticles on MnCo 2 O 4 microspheres for CLC of methane. The results reveal that the pure MnCo 2 O 4 shows high activity for methane combustion (methane conversion is as high as 94% at 800 °C), but the methane conversion sharply decreases to lower than 40% after 20 redox cycles, indicating poor redox stability. The presence of CeO 2 on MnCo 2 O 4 microspheres significantly improves the redox stability, which is benefited from the partial incorporation of high valence Ce 4+ cations into the MnCo 2 O 4 lattice that results in the generation of abundant oxygen vacancies due to the charge balance. Among different xCeO 2 /MnCo 2 O 4 samples, the 10% CeO 2 /MnCo 2 O 4 shows the highest stability during the successive CLC testing either in the capacity for CH 4 combustion or in the aspect of structure, which shows a capacity for CH 4 combustion at 2.22 mmol/g and the average CH 4 conversion higher than 90% on the stable state. Kinetic analysis indicates that the reduction process of recycled 10%CeO 2 /MnCo 2 O 4 can be divided into two steps (the main reduction of Co and Mn oxides, respectively) based on apparently different reaction rates, and both the two steps can be mainly described by a 1D growth of nuclei model. The activation energy for step 1 and step 2 are 32.34 kJ/mol and 88.54 kJ/mol, respectively.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiang Zhao,Mu Zhang,Hui Li,Wei Pan,Zhengtang Luo,Xudong Sun
The development of a simple and general approach for manufacturing complex hollow structures is essential to achieve rapid dynamic response and high energy density storage for supercapacitor electrodes. Herein, we report a versatile heating rate-controlled synthetic route to prepare MnCo 2 O 4 microspheres with multiple interiors. Comparative study reveals that MnCo 2 O 4 microspheres with core–shell structure (MCO-CSS) process the highest specific surface area (91.6 m 2 g −1 ) and oxygen vacancy density (0.16), which can provide more electroactive sites for surface Faradic reaction and further facilitate the kinetics of rapid charge storage. While the porous shell and well-defined gap endow MCO-CSS with excellent permeability and low-resistance pathways for electrolyte ions, as well as enhanced volume change accommodation. Benefiting from the structural advantages, MCO-CSS displays an excellent specific capacitance of 1064.4F g −1 at 1 A g −1 , remarkable rate capability, and satisfactory cycle stability (89.1% capacitance retention at 2 A g −1 over 1000 cycles). Additionally, an asymmetric supercapacitor device, with an MCO-CSS cathode and porous carbon spheres anode, delivers a remarkable energy density of 33.9 Wh kg −1 at a power density of 187.4 W kg −1 , as well as 84.13% capacitance retention over 3000 cycles at 1 A g −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Wenpeng Hong,Yuhang Li,Haifeng Jiang,Yu Zhang,Wei Jia,Meng Song
Catalytic steam gasification is a promising route for converting plastic waste into valuable gaseous products. This work explores the heterogeneous catalytic gasification behavior of polystyrene (PS) in a two-stage fixed bed system, as well as the promotion mechanism for the generation of gaseous hydrocarbons. The obtained results indicate that adding MnCo 2 O 4 catalyst can effectively promote the formation of gaseous hydrocarbons. Further, the incorporation of Cu strengthens the above reaction process, resulting in a yield of 85.08 mmol/g for the C 1 -C 3 gaseous hydrocarbons. However, the doping of Ni has a negative effect on the generation of gaseous hydrocarbons. Moreover, an increase in the flow rate of steam within the system results in an initial rise followed by a decline in the yield of gaseous hydrocarbons. The optimal steam inflow is determined at 0.14 mL/min. The cycling test results of the catalyst show that the yield of the gaseous components of C 1 -C 3 can still be maintained at about 80 % of the initial state after five cycles. Finally, the synergistic pathway of steam and catalyst in PS gasification is elucidated. These works provide important and valuable guidance for the preparation of high-value gas-phase hydrocarbon products from waste plastics.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
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.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Chao He,Chunyan Tang,Wen-Da Oh
In order to efficiently degrade ibuprofen (IBU) by peroxymonosulfate (PMS) activation, manganese cobalt oxide nanoparticles-decorated functionalized multi-walled carbon nanotubes (MnCo 2 O 4 /FCNTs) were prepared using a facile hydrothermal method. Comprehensive characterization of this PMS activator in multi-scale suggested that MnCo 2 O 4 nanoparticles were uniformly decorated on FCNTs. The catalytic performance was systematical evaluated under various environmental conditions, including temperature, pH, and the presence of different common water matrix species (e.g., Cl - , HCO 3 - , and natural organic matter). The as-synthesized MnCo 2 O 4 /FCNTs demonstrated excellent catalytic activity with k app ranging 0.285–0.327 min −1 under a wide pH range of 3–9 within 10 min, which achieved a complete removal of IBU and a mineralization rate higher than 90%. During oxidation process for stability and reusability test, recycled MnCo 2 O 4 /FCNTs was found durable with negligible leaching of metal ions from spent catalyst, exhibiting its high stability for PMS activation with merely slight decrease of k app from 0.285 to 0.201 min −1 in the fourth cycle. Electron paramagnetic resonance analysis further confirmed that • OH, SO 4 •- and 1 O 2 were generated in the robust MnCo 2 O 4 /FCNTs-PMS system. Both radical and nonradical reactions were found to be responsible for the enhanced IBU degradation. Overall, this study sheds light on practical knowledge of IBU removal using MnCo 2 O 4 /FCNTs for PMS activation.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）