Journal of Energy Storage
·
2025
·
IF 9.8
Ruiyang Tang,Hui Li,Yu Zhang,Yunbo Zhao,Yang Wu
Designing appropriate semiconductors for photo-assisted supercapacitor serves as a promising means to maximize solar energy use. The efficiency of photogenerated carrier separation is a key to improving the energy storage performance of semiconductor-based photoelectrodes. In this study, we applied dopant-defect engineering to fabricate MnCo 2 O 4 with N doping and oxygen vacancies containing (N-Ov-MCO) for use as a photo-assisted supercapacitor electrode. N doping promoted the generation and effective separation of photogenerated electron-hole pairs under light. In addition, the formed oxygen vacancy facilitates OH − adsorption on the N-Ov-MCO surface combined with DFT simulation findings. As a result, the specific capacitance of N-Ov-MCO (567.25 F g −1 ) at 1 A g −1 under illumination is 1.28 times greater than that of the original MCO. A red LED shone brighter under light when three N-Ov-MCO-based devices (N-Ov-MCO//AC) were linked in series, which demonstrated its practical potential. In the N-Ov-MCO//AC, the photogenerated electrons were introduced into the circuit via nickel foam, which aided in the charging process and the photogenerated holes along with OH − were involved in in the oxidation process. This study revealed that dopant-defect engineering efficiently improves the photo-assisted supercapacitor performance and offers a basis for the theory on practical applications.
研究领域:
材料科学
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能源存储
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Qisheng Fang,Mengxuan Sun,Xiaohe Ren,Yongxiu Sun,Yijun Yan,Ziwei Gan,Jianan Huang,Baobao Cao,Wenzhong Shen,Zhijie Li,YongQing Fu
MnCo 2 O 4 is regarded as a good electrode material for supercapacitor due to its high specific capacity and good structural stability . However, its poor electrical conductivity limits its wide-range applications. To solve this issue, we integrated the MnCo 2 O 4 with Ni 3 S 4 , which has a good electrical conductivity, and synthesized a MnCo 2 O 4 /Ni 3 S 4 nanocomposite using a two-step hydrothermal process. Comparing with individual MnCo 2 O 4 and Ni 3 S 4 , the MnCo 2 O 4 /Ni 3 S 4 nanocomposite showed a higher specific capacity and a better cycling stability as the electrode for the supercapacitor. The specific capacity value of the MnCo 2 O 4 /Ni 3 S 4 electrode was 904.7 C g −1 at 1 A g −1 with a potential window of 0–0.55 V. A hybrid supercapacitor (HSC), assembled using MnCo 2 O 4 /Ni 3 S 4 and active carbon as the cathode and anode, respectively, showed a capacitance of 116.4 F g −1 at 1 A g −1 , and a high energy density of 50.7 Wh kg −1 at 405.8 W kg −1 . Long-term electrochemical stability tests showed an obvious increase of the HSC’s capacitance after 5500 charge/discharge cycles, reached a maximum value of ∼162.7% of its initial value after 25,000 cycles, and then remained a stable value up to 64,000 cycles. Simultaneously, its energy density was increased to 54.2 Wh kg −1 at 380.3 W kg −1 after 64,000 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2013
·Vol. 2
·期 5
·529-535
·
IF 0
Yuting Zhang,Liqiang Luo,Zhao Zhang,Yaping Ding,Shuai Liu,Dongmei Deng,Hongbin Zhao,Yigang Chen
Spinel-type MnCo2O4 nanofibers (MCFs) were successfully synthesized by electrospinning and sequential calcination. The crystal structure, composition and morphology of the synthesized MCFs were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, energy-dispersive spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy. Due to the outstanding electron-transfer ability of spinel MnCo2O4 and the large surface area of nanofibers, the synthesized MCFs were employed as electrocatalysts for the oxidation of glucose. Cyclic voltammetry and amperometry were used to evaluate the electrocatalytic activities of the MCFs towards glucose. The non-enzymatic glucose sensor showed a wide linear range of 0.05–800 μM with a low detection limit of 0.01 μM (S/N = 3).
研究领域:
材料科学
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生物医学工程
·
分析化学
✓ 已验证
DOI
CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 58
·14478-14488
·
IF 5.236
Fan Yang,Hao Guo,Yuan Chen,Mengni Xu,Wenhu Yang,Mingyue Wang,Meng Yang,Junye Zhang,Lei Sun,Tingting Zhang,Wu Yang
Graphical Nanoflower structural MnCo 2 O 4 /Ni-MOF composite prepared by in situ growth of Ni-MOF on the surface of MnCo 2 O 4 nanorods derived from Co/Mn-MOF at 600 °C has a high cycling stability and outstanding rate performance as supercapacitor electrode material. MnCo 2 O 4 is derived from a Co/Mn bimetallic metal-organic framework (MOF). Then Ni-MOF is directly grown on the surface of the obtained MnCo 2 O 4 to form a nano-flower structure with small balls. A large surface area, abundant active sites of MnCo 2 O 4 and porosity of Ni-MOF allow the prepared MnCo 2 O 4 /Ni-MOF composite material to deliver an excellent electrochemical performance. At the same time, an appropriate thermal treatment temperature of the MnCo 2 O 4 precursor is also very important for controlling the morphology of the obtained MnCo 2 O 4 and electrochemical performances of the resulted composite material including electric conductivity, specific capacitance and rate performance. The prepared MnCo 2 O 4 -600/Ni-MOF shows an ultrahigh rate performance (when the current density increases from 1 to 10 A g −1 , the capacitance retention rate is as high as 93.41 %) and good cycle stability (the assembled asymmetric supercapacitor advice delivers a capacitance retention rate of 94.74 % after 20 000 charge and discharge cycles) as well as a relatively high specific capacitance. These excellent electrochemical properties indicate that MnCo 2 O 4 /Ni-MOF has a good application prospect in the market.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jun Li,Donglin Zhao,Longcheng Zhang,Yuchun Ren,Luchao Yue,Zerong Li,Shengjun Sun,Yongsong Luo,Quanying Chen,Tingshuai Li,Kai Dong,Qian Liu,Qingquan Kong,Xuping Sun
Direct electrocatalytic reduction of nitrate (NO 3 – ) is an efficient route to simultaneously synthesize ammonia (NH 3 ) and remove NO 3 – pollutants under ambient conditions, however, it is hindered by the lack of efficient and stable catalysts. Herein, a self-supported spinel-type MnCo 2 O 4 nanowire array is demonstrated for exclusively catalyzing the conversion of NO 3 – to NH 3 , achieving a high Faradic efficiency of 97.1% and a large NH 3 yield of 0.67 mmol h −1 cm −2 . Furthermore, density functional analysis reveals that MnCo 2 O 4 (220) surface has high activity for NO 3 – reduction with a low energy barrier of 0.46 eV for *NO to *NOH.
研究领域:
电化学
·
催化
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2017
·Vol. 4
·期 11
·1862-1869
·
IF 4.036
Mu Gao,Xiaofeng Lu,Maoqiang Chi,Sihui Chen,Ce Wang
Mixed transition-metal oxides (MTMOs) have attracted much research interest because of their promising applications in artificial enzymes. In this work, uniform hollow MnCo2O4 nanofibers have been fabricated via an electrospinning technique followed by a calcination process, which can be used as efficient oxidase mimics. In detail, the as-prepared hollow MnCo2O4 nanofibers display excellent oxidase-like activity toward the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) superior to their corresponding single-metal oxides without the addition of H2O2. Based on the high catalytic activity of hollow MnCo2O4 nanofibers and their inhibition effect by specific substances, the system of hollow MnCo2O4 nanofibers–TMB has potential to be applied in assays to detect sulfite and L-cysteine using a colorimetric approach with high sensitivity and selectivity. This work implies a broad application prospect of MTMOs in biosensors, environmental protection, food safety and medical science.
研究领域:
生物传感
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环境科学
·
食品安全
·
医学科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2016
·Vol. 92
·期 7
·1601-1612
·
IF 2.738
Jiahua Lu,Qing Liu,Zhongduo Xiong,Zhijun Xu,Yingjie Cai,Qiang Wang
BACKGROUND Synthetic dyes are present in the wastewater from many industrial processes and they cause serious problems to human and aquatic life. The development of a novel and effective peroxymonosulfate (PMS) activator is proposed to eliminate dyes pollution. A new magnetic nanocomposite, Fe 3 O 4 @C/MnCo 2 O 4 , was prepared and characterized. The activity of Fe 3 O 4 @C/MnCo 2 O 4 as heterogeneous catalyst for PMS activation was evaluated by the decolorization of Acid Orange II (AO II). RESULTS With a ‘Fe 3 O 4 @C/MnCo 2 O 4 + PMS’ system, the dye solution could be nearly completely decolorized in about 25 min over a wide pH range (pH 4.1−8.1), and 98% removal could be achieved in 15 min without pH adjustment (pH = 6.38). The influence of solution pH, dosage of catalyst and PMS, reaction temperature, and PMS activation mechanism were studied. It was found that sulfate radicals were the primary species responsible for the oxidation of AO II. The catalyst was magnetically separable and displayed good stability and reusability, giving six cycles of use without deterioration in its performance. CONCLUSION This study demonstrated the simple recycling and high activity of Fe 3 O 4 @C/MnCo 2 O 4 composite in PMS activation for the decolorization of AO II solution. It provides a promising way for the decontamination of organic pollutants. © 2016 Society of Chemical Industry
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
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 37
·e2409201121
·
IF 9.4
Kang Xiao,Bo-Hao Xiao,Jian-Xi Li,Shunsheng Cao,Zhao-Qing Liu
Transition metal oxides ion diffusion channels have been developed for ammonium-ion batteries (AIBs). However, the influence of microstructural features of diffusion channels on the storage and diffusion behavior of NH4+ is not fully unveiled. In this study, by using MnCo2O4 spinel as a model electrode, the asymmetric ion diffusion channels of MnCo2O4 have been regulated through bond length optimization strategy and investigate the effect of channel size on the diffusion process of NH4+. In addition, the reducing channel size significantly decreases NH4+ adsorption energy, thereby accelerating hydrogen bond formation/fracture kinetics and NH4+ reversible diffusion within 3D asymmetric channels. The optimized MnCo2O4 with oxygen vacancies/carbon nanotubes composite exhibits impressive specific capacity (219.2 mAh g–1 at 0.1 A g–1) and long-cycle stability. The full cell with 3,4,9,10-perylenetetracarboxylic diimide anode demonstrates a remarkable energy density of 52.3 Wh kg–1 and maintains 91.9% capacity after 500 cycles. This finding provides a unique approach for the development of cathode materials in AIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
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.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
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.
研究领域:
材料科学
·
能源存储与转换
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Zihan Chen,Xihong Zu,Liheng Chen,Yi Qi,Wenbin Jian,Yaoying Wu,Wenli Zhang,Xuliang Lin,Guobin Yi,Quanbing Liu,Zilun Tang,Jianyu Wu,Huafeng Dong,Yanlin Qin
The development of high-performance flexible supercapacitors is desperately desired for application in wearable electronics, but the fabrication of a flexible self-supporting 3D electrode with light weight and high energy density remains challenging. Herein, we report an approach to fabricate the flexible self-supporting and lightweight 3D G-PPy@Fe-MnCo2O4 hierarchical electrode for flexible solid-state supercapacitors (FSSCs), which utilizes the active material 3D G-PPy as a substrate to vertically grow Fe-MnCo2O4 nanowire (NW) arrays. Importantly, the experimental results and DFT simulations indicate that Fe-MnCo2O4 NWs obtain metallic characteristics by doping Fe into a MnCo2O4 lattice, which induces the free propagation of electrons in the electrode. Thus, MnCo2O4 utilization efficiency and cycle performance are both greatly enhanced. The electrode has a high areal specific capacitance of 5136 mF cm–2 (422.4 F g–1) at 2 mA cm–2 with long-term cycle stability. The capacitance retention is about 94.7% after 7000 cycles. It presents a viable design route toward advanced wearable energy storage devices.
研究领域:
材料科学
·
能源存储技术
·
纳米技术
✓ 已验证
产品关联
DOI
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 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）