JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Yaya Wang,Bo Wang,Ruixia Shi,Ling Chen,Quande Che,Junpeng Wang,Ping Yang
Graphic carbon nitride (g-C 3 N 4 ) as a typical photocatalyst has large specific surface area and high stability. However, the application for supercapacitors is limited because of its poor electrical conductivity. In this paper, three-dimensional (3D) g-C 3 N 4 /Mn 3 O 4 heterostructures with enhanced supercapacitor properties were constructed by a two-step synthesis. The precursor of 3Dg-C 3 N 4 /Mn 3 O 4 was firstly prepared by a freeze-drying process using NaCl as templates. After thermal polymerization at high temperature and subsequent removal of NaCl, 3D g-C 3 N 4 /Mn 3 O 4 heterostructures were constructed. As prepared samples revealed high specific capacitance performance which is related the well dispersion of Mn 3 O 4 in 3D g-C 3 N 4 networks to expose more redox catalytic centers. The result indicated with a current density of 1 A/g, the specific capacitance of sample prepared using optimized conditions was 753.9 F g −1 which is much higher than that of other samples. The stability test indicates the sample revealed high stability (84.1 %) after 5000 cycles under 5 A/g because of excellent structural stability of g-C 3 N 4 . The result provides a useful strategy for the application of g-C 3 N 4 in energy storage.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Runren Jiang,Guanghua Lu,Min Wang,Tianjian Dang,Jianchao Liu,Zhenhua Yan
Utilizing photocatalysis to degrade pollution is emerging as a promising way to treat wastewater, but is challenged by low efficiency and scanty toxicity cognition. In this work, Mn 3 O 4 /BiOCl based crystal plane engineering systems are applied for naproxen (NPX) degradation, and Mn 3 O 4 /BiOCl 010 displayed better degradation rate, which is 16 and 8 times than that of the Mn 3 O 4 /BiOCl 001 and BiOCl 010 . According to the degradation pathway analysis and biological toxicity experiments, the toxicity of the degradation solution increased first and then decreased, which may be caused by the mineralization of NPX and more toxic intermediates. Affected by the distinct internal charge transfer directions of the two crystal planes of BiOCl, Mn 3 O 4 /BiOCl 010 heterojunction system has a faster charge transform than that of Mn 3 O 4 /BiOCl 001 . Moreover, the valence cycle of Mn can further accelerate the charge transfer, which can also provide a powerful driving force for NPX elimination.
研究领域:
环境科学
·
光催化
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 13
·6267-6273
·
IF 3.925
Qinyi Mao,Dandan Li,Yuming Dong
Recently, much attention has been focused on the development of photocatalysts for hydrogen evolution. Up to now, efficient hydrogen generation is still greatly challenging due to the restraints of the surface redox reaction rate, and the introduction of a co-catalyst is one of the keys to this problem. Here, dual non-noble co-catalysts NixP and Mn3O4 were proposed and prepared on a g-C3N4/red phosphorus (CNP) hybrid structure with a high light adsorption capability by a two-step photo-deposition method. The photo-excited charge on the composite catalyst separate and transfer from C3N4 to red phosphorous due to a type I heterojunction structure. NixP and Mn3O4 act as reductive and oxidative co-catalysts, respectively. The hydrogen production rate was 5851.3 μmol g−1 h−1, 12.4 times that of pure CNP. The consistent catalytic activity in an actual 25 mL flask for hydrogen evolution over eight hours accumulated 245.08 μmol H2 under solar simulated irradiation. This work provides practical reference for the development of a novel inexpensive photocatalyst system.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2018
·
IF 3.463
Kun Liu,Tao Qin,Yongbin Sun,Chao Hou,Xiaoqun Cao,Shoujun Jiang
Ag 2 Mn 5 /SiC catalyst is simply obtained by in-situ reaction-induced of their corresponding nitrate compounds onto SiC support, which exhibits excellent catalytic activity and stability in the gas phase oxidation of alcohols (94% conversion of benzyl alcohol and 98% selectivity of benzaldehyde). The catalytic activity could maintain at least 300 h after four regenerations due to the formation of highly active Ag 0 -Mn 3 O 4 species. XRD and XPS indicate that active Ag 0 -Mn 3 O 4 species is formed from Ag 2 O and MnO 2 in the reaction conditions. The synergistic effect between 34 nm Ag nanoparticles and 5.5 nm Mn 3 O 4 nanoparticles in alcohol oxidation reaction is prominent, which is testified by HRTEM and three-step experiment.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Yu Gu,Jian Wu,Xiaogong Wang,Weijie Liu,Shu Yan
Almost all existing methods for preparing reduced graphene oxide/Mn3O4 (RGO/Mn3O4) composites are based on the synthetized graphene or graphene oxides (GO), which make them complicated and high-cost processes. Here, we reported a new method, which is able to convert graphite directly to RGO/Mn3O4 composites. Thus, it is simpler, more economical, and productive. The structure of RGO/Mn3O4 inheriting intermediate product GO/MnO2 composites that are formed by the present method is a novel three-dimensional “multilayer steamed bread” nanostructure, which constitutes mutually beneficial “symbiosis”. The nano-Mn3O4 supports the space between RGO layers and further to the combination of RGO to self-assemble into large-sized (>40 μm) nanocomposites. Meanwhile, the formed Mn3O4 particles were small (60 × 10 nm2) in diameter and distributed homogeneously without the use of any template and surfactant. Because the structure and nanosize of composite cause the excellent electrochemical properties, RGO/Mn3O4 electrodes deliver an enhanced specific capacitance of 438.7 F/g at 0.3 A/g and outstanding cyclic stability (77.5% of its initial capacitance is retained after 1000 cycles).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 10
·3888-3895
·
IF 3.288
Ye Li,Yan Song,He Wang,Wensheng Yu,Jinxian Wang,Xiangting Dong,Guixia Liu,Qianli Ma
Transitional metal oxide nanoparticles and carbon composites have attracted tremendous research interest due to their potential as anode materials in next-generation lithium-ion batteries (LIBs). Herein, porous Mn3O4/carbon nanofibers (Mn3O4/CNFs) are designed and synthesized via electrospinning in combination with an in situ growth method followed by subsequent multi-step heat treatments. As an anode for LIBs, Mn3O4/CNFs-2 exhibits good cyclability with high reversible capacity. A reversible capacity of 754 mA h g−1 over 400 cycles at a current density of 0.1 A g−1 is achieved. The presence of CNFs can improve the conductivity of the electrode material and relieve the volume expansion of Mn3O4 during the process of Li+ insertion and extraction. Meanwhile, a small amount of N atom doping can enhance the reaction kinetics and Li+ pseudocapacitive behavior while providing reversible capacity and long cycling performance. Quantitative analysis shows that mixed diffusion-controlled and capactive behavior control mechanisms account for the Li+ storage, wherein the pseudocapacitive behavior can contribute to additional capacity.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2016
·Vol. 80
·期 2
·326-332
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IF 1.473
Ma Wenle,Feng Yongmei,Wang Li,Xue Junying,Cui Hongtao
Abstract Mn 3 O 4 nanoparticles were prepared at 60 °C in ethanol solution by a facile precipitation method. It was found that the particle size of the as-prepared Mn 3 O 4 depended on the alkalinity of precipitants. Nanoparticles with average size of 6 nm were obtained by using morpholine as precipitant which had low alkalinity, while 10 nm particles were produced by using NaOH as precipitant. The former particles presented higher degree electrochemical double-layer capacitor-like behavior and higher electrochemical performance than the latter. This could be attributed to the effective faradaic reactions of particles, which originated from the low equivalent series resistance resulting from their smaller particle size. Graphical Abstract Mn 3 O 4 nanoparticles were prepared in ethanol by a facile precipitation method using precipitants with different alkalinity. It was found that smaller particles (a) were generated by using precipitant with low alkalinity as compared with the one with higher alkalinity (b). As a result, the Mn 3 O 4 nanoparticles presented a high-degree electrochemical double-layer capacitor-like behavior due to their low equivalent series resistance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Congcong Chen,Meng Xie,Lingshuai Kong,Wenhui Lu,Zhenyu Feng,Jinhua Zhan
Peroxymonosulfate (PMS) activation by heterogeneous catalysts has been widely investigated to remove organic contaminants. Nevertheless, the technology is restricted to the bench-scale batch system. For practical applications, a supported catalyst design based on a reactor configuration with catalyst recovery is the need for future development. In this study, Mn 3 O 4 nanodots-g-C 3 N 4 nanosheets (Mn 3 O 4 /CNNS) composites were prepared via a facile hydrothermal method. The micro-structures and compositions of composites were investigated by a series of characterization methods. It was found that the Mn 3 O 4 nanodots (5−10 nm) were distributed uniformly over the CNNS. When the added amount of CNNS was 150 mg during the synthesis process, a composite named as Mn 3 O 4 /CNNS-150 was obtained, which exhibited the best performance on PMS activation for 4-chlorophenol (4-CP) removal. The Mn 3 O 4 /CNNS-150@PTFE membrane was synthesized by facile vacuum filtration. The catalytic membrane was applied in filtration experiments for the degradation of different contaminants. The stability tests revealed excellent stability of the catalytic membrane. The redox circles of Mn(IV)/Mn(III)/Mn(II) on the Mn 3 O 4 surface were the main source of activated PMS and a possible activation mechanism in the reaction system was provided. This study is of great significance for the development of novel catalytic membranes with PMS activation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zhixiong Huang,Yanjie Duan,Quanhao Jing,Mengqi Sun,Beibei Tang,Shaojun Shi
Zn-ion batteries stand out as an energy storage solution for the large-scale equipment because of the security, nontoxicity as well as relatively low cost. In this work, assembling GO with Mn 3 O 4 at low temperature can not only construct a well-defined nanoscale crystallization, but also surmount the poor electrochemical performance of pure Mn 3 O 4 . The typical Mn 3 O 4 /GO composites exhibit a stable discharge capacity of 215.6 mA h g −1 at 0.1 A g −1 . At high current density of 1 A g −1 , the cathode can also exhibit an excellent and satisfactory cycling stability of 85.0% after 500 cycles. It distinctly reveals that this work not only provides a simple strategy to create a well-defined nanoscale crystallization with transition metal oxides , but also make fully utilize to the synergistic effects of the porous structure of the nanoscale Mn 3 O 4 and GO, which presents a promising cathode material for Zn-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2020
·
IF 1.566
Lei Su,Chunyong Zhang,Li Shu,Linna Huang,Jianning Li,Hengfei Qin
A series of metal oxide nanocomposites have been successfully synthesized by electrospinning technology. The obtained nanocomposites (Cu 2 O-Mn 3 O 4 -NiO) are an ordered arrangement of metal oxide particles (10 nm), with the shape like bead chain. The acquired Cu 2 O-Mn 3 O 4 -NiO ternary nanocomposites were used as electrode materials to manufacture a supercapacitor. Electrochemical tests showed that the synthesis of nanocomposites made of electrode materials had good electrochemical performance in 6 mol/L KOH electrolyte. The results showed that at a scan rate of 5 mV/s, the specific capacitance of Cu 2 O-Mn 3 O 4 -NiO had a larger specific capacitance of 1306 F/g than NiO, Cu 2 O-NiO and Mn 3 O 4 -NiO. The excellent electrochemical performance showed that the electrostatic spinning method is an effective technology for developing nanocomposites for energy storage devices.
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
RSC Advances
·
2014
·Vol. 4
·期 29
·15091-15097
·
IF 3.708
Qian Zhang,Yuanfu Liu,Yandong Duan,Nianqing Fu,Qiuping Liu,Yanyan Fang,Qingwen Sun,Yuan Lin
Mn3O4-anchored reduced graphene oxide (Mn3O4/RGO) nanocomposites have been successfully synthesized via a facile, effective, energy-saving technique. The surface morphology and structure of the Mn3O4/RGO composites were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR), high resolution transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), Brunauer–Emmett–Teller (BET) surface area and Barrett–Joyner–Halenda porosity (BJH). The composite material was applied as the counter electrode (CE) for dye-sensitized solar cells (DSSCs). Electrochemical impedance spectra (EIS), cyclic voltammetry (CV) and Tafel polarization measurements revealed a better electrocatalytic performance for the reduction of triiodide in Mn3O4/RGO based DSSCs, compared with the devices with reduced graphene oxide (RGO) CEs. The Mn3O4/RGO improves the fill factor by 56% and the power conversion efficiency of this kind of DSSC reaches 5.90%, which is much higher than the DSSC assembled from RGO CEs. A Pt counter electrode as a reference was also tested.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Zhenhua Ge,Bin Fu,Xing Li,Jinping Zhao,Bo Ma,Zhiqiang Luo,Yantao Chen
Electrochemical water splitting is a very prospective technique to obtain the green hydrogen fuel . The oxygen evolution reaction becomes a limitation owing to the multiple electron transfer process. Thereby, a lot of attention is paid on the development of noble-metal free electrocatalysts for boosting the water oxidation process . The heterostructure of Mn 3 O 4 nanoparticles on Cu(OH) 2 nanowire arrays is fabricated, which exhibits an electrocatalytic activity close to RuO 2 . Compared with the single (hydro)oxides, the largely improved performance of the heterostructure towards water oxidation can be attributed to the enhanced charge transfer by the electronic interaction across the interface and the increased active sites for the rational combination of different active species . This work can be valuable for highlighting the role of heterostructure in the design and development of novel transition metal-based electrocatalysts for water oxidation.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）