ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Jinrui Li,Zhongxin Zhuang,Zheng Guo,Zhonggang Liu,Xingjiu Huang
Exploiting advanced bimetallic oxide as sensing materials for electroanalysis offers new opportunity to improve the electrochemical performance, but still presents a tough challenge. Herein, we synthesized the uniform Fe 2 O 3 /Mn 3 O 4 nanocubes from a framework structure in a facile approach, which were developed as the electrochemical catalyst for individual and simultaneous analysis of Cu(II) and Hg(II) in 0.1 M HAc-NaAc buffer solution (pH5.0). It showed the excellent electrochemical behavior for the simultaneous analysis Cu(II) and Hg(II) with high sensitivities of 69.29 and 190.55 μA μM cm −2 . The corresponding limit of detection values (LODs) were calculated to be 3.94 nM and 1.39 nM, respectively. The excellent electrochemical behavior of Fe 2 O 3 /Mn 3 O 4 could be attributed to the large specific surface area, which could provide a large number of adsorption sites for Cu(II) and Hg(II). Meanwhile, the bimetallic Fe and Mn atoms arranged in the porous nanocubes could offer a synergistic effect and improve the electrochemical activity. Moreover, it could be successfully applied for the simultaneous analysis of Cu(II) and Hg(II) in real water samples with the favorable recovery rate. The results confirmed that the Fe 2 O 3 /Mn 3 O 4 nanocubes could serve as a reliable platform for the simultaneous analysis of Cu(II) and Hg(II).
研究领域:
分析化学
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材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 30
·15650-15660
·
IF 8.867
Zhenzhang Weng,Jie Li,Yali Weng,Miao Feng,Zanyong Zhuang,Yan Yu
Current methods that utilize Fenton-like reagents to remove persistent organic pollutants suffer from several limitations, i.e., the reagents may release metal ions into the sludge and cause secondary pollution, the reagents are easily inactivated after use, and the use of additives (e.g., 2KHSO5·KHSO4·K2SO4, Na2S2O8 and H2O2) can be costly but cannot be avoided. In this work, through a one-pot reaction, we prepared surfactant-free porous nano-Mn3O4 as an efficient Fenton-like reagent. Without the addition of external H2O2, it could remove 86.8% and 96.9% of the phenol from an aqueous solution within 1 and 5 min, respectively, and thus outperformed many other reported reagents. The underlying mechanism for the removal of organic pollutants by this Mn3O4 reagent was examined. It was found that the low-valence Mn in Mn3O4 reacted with the dissolved O2 to generate H2O2, and the H2O2 in turn created hydroxyl radicals (HO˙) to degrade organic pollutants. The Mn3O4 was also annealed to generate porous nano-Mn2O3, and a comparison of the performance of Mn3O4 and Mn2O3 in removing organic pollutants revealed that low-valence Mn in the oxides played a critical role in scavenging the pollutants. Note that this novel nano-Mn3O4 could remove pollutants without the addition of external H2O2, and it could be easily reactivated after use through reduction by NaBH4 and thus be recycled. The Mn3O4 can also be successfully applied to complex polluted water containing a mixture of phenolics. These findings pave the way for developing other efficient and environmentally friendly Fenton-like reagents for removing organic pollutants in wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2024
·
IF 1.3
Ying Geng,Chun-yong Zhang,Lin Zhu,Hao-yu Wang,Ji-rong Bai,Jing-jing Huang,Zhen-long Zhao
s Polymer catalyst electrodes have good electrical conductivity, high mechanical strength and other characteristics, which have good prospects in the future market of green and low carbon. In this paper, the electrode of PEDOT polymer catalyst is studied, and the electrochemical performance of the electrode is improved by doping different metals. This study describes the design of PEDOT-Co 3 O 4 @Mn 3 O 4 /Mn 2 O 3 catalysts by simple solvothermal synthesis. As a catalyst in the hydrogen evolution reaction (HER), the overpotential of the same polarization curve is much smaller than that of PEDOT, with a Tafel slope of 118.21 mV dec ‐1 , by electrochemical and characterization analysis. In the test of the supercapacitor performance, it has a large specific capacitance of 1298.5 Fg -1 and a small electrical impedance (0.21 Ω). After 2000 cycles of CV test, the capacitance remains 87.76 %, and the curve shape is stable, which proves that it has good electrochemical performance. Our results confirm the materials have great application prospects in HER and capacitors.
研究领域:
材料科学
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电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 52
·期 3
·609-620
·
IF 4.569
Samuel Guemou,Dongqiang Gao,Fuying Wu,Jiaguang Zheng,Tao Wei,Zhendong Yao,Danhong Shang,Liuting Zhang
As an ideal material for solid-state hydrogen storage, magnesium hydride (MgH2) has attracted enormous attention due to its cost-effectiveness, abundant resources, and outstanding reversibility. However, the high thermodynamics and poor kinetics of MgH2 still hinder its practical application. In this work, a simple stirring–hydrothermal method was used to successfully prepare bimetallic Mn3O4/ZrO2 nanoparticles, which were subsequently doped into MgH2 by mechanical ball milling to improve its hydrogen sorption performance. The MgH2 + 10 wt% Mn3O4/ZrO2 composite began discharging hydrogen at 219 °C, which was 111 °C lower compared to the as-synthesized MgH2. At 250 °C, the MgH2 + 10 wt% Mn3O4/ZrO2 composite released 6.4 wt% hydrogen within 10 min, whereas the as-synthesized MgH2 reluctantly released 1.4 wt% hydrogen even at 335 °C. Moreover, the dehydrogenated MgH2 + 10 wt% Mn3O4/ZrO2 sample started to charge hydrogen at room temperature. 6.0 wt% hydrogen was absorbed when heated to 250 °C under 3 MPa H2 pressure, and 4.1 wt% hydrogen was taken up within 30 min at 100 °C at the same hydrogen pressure. In addition, compared with the as-synthesized MgH2, the de/rehydrogenation activation energy values of the MgH2 + 10 wt% Mn3O4/ZrO2 composite were decreased to 64.52 ± 13.14 kJ mol−1 and 16.79 ± 4.57 kJ mol−1, respectively, which incredibly contributed to the enhanced hydrogen de/absorption properties of MgH2.
研究领域:
材料科学
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氢能
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纳米技术
✓ 已验证
DOI
高影响因子
Nanomedicine-Nanotechnology Biology and Medicine
·
2025
·
IF 4.6
Xin Bao,Guang Xin,Qilong Zhou,Tao Wang,Xinrui Xu,Lijuan Feng,Chengyu Wan,Fangyuan Jing,Yijiang Liu,Yangbo Liu,Xiaoting Chen,Wen Huang
Acute pancreatitis (AP) is a common inflammatory disease that seriously threatens people's lives and health. Excessive reactive oxygen species (ROS) and cell-free DNA (cfDNA) are significant contributors to the advancement of AP. In this study, a nanoparticle with a dual function to clear ROS and cfDNA was developed for the treatment of acute pancreatitis. Cationic polyethyleneimine (PEI) was used to modify Mn 3 O 4 , resulting in the creation of Mn 3 O 4 -PEI nanoparticles, which exhibited strong binding to cfDNA and the ability to scavenge ROS. In vitro, Mn 3 O 4 -PEI showed significant inhibition of ROS and cfDNA-induced inflammation and demonstrated therapeutic effects in a model of acute pancreatitis induced by sodium taurocholate (STC). This research introduces a new nanomedicine approach for the treatment of AP.
研究领域:
纳米医学
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炎症性疾病
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活性氧清除
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细胞游离DNA靶向
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药物递送
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemElectroChem
·
2018
·Vol. 6
·期 2
·359-368
·
IF 4.446
Ms. Wanqing Li,Mr. Hongquan Fu,Yonghai Cao,Hongjuan Wang,Hao Yu,Zhiwei Qiao,Hong Liang,Feng Peng
Graphical Mn 3 O 4 nanoparticles encapsulated inside carbon nanospheres supported on a carbon plate (Mn 3 O 4 @CS/CP) are designed, which exhibit exceptionally good stability and reversibility for ORR and OER. Furthermore, the electrocatalytic mechanism is analyzed. Mn 3 O 4 nanoparticles encapsulated inside carbon nanospheres supported on a carbon plate (Mn 3 O 4 @CS/CP) were designed, their bifunctional electrocatalytic performance for both, the oxygen evolution reaction (OER) at the anode and the oxygen reduction reaction (ORR) at the cathode were studied in alkaline solution. The prepared Mn 3 O 4 @CS/CP catalyst exhibits excellent electrocatalytic performance towards ORR, with less negative onset potential and long durability. Combining the results of in-situ Fourier transform infrared spectroscopy (FTIR) and density functional theory (DFT) calculations, it is revealed that Mn 3 O 4 acts as active site for ORR to promote the transformation of OH* into OH − . In addition, Mn 3 O 4 @CS/CP possesses an excellent electrochemical OER performances with the lower overpotential along with prosper Tafel slope and robust durability. DFT calculations show the transformation from O* to OOH* is the rate determining step for OER, and Mn 3 O 4 @CS/CP shows the minimum barrier, indicating that graphene sheet on the outer of Mn 3 O 4 improves the transformation from O* to OOH*. The oxygen electrode activity parameter (potential difference between OER at current density of 10 mA/cm 2 and ORR at current density of −2 mA/cm 2 ) on Mn 3 O 4 @CS/CP is 0.72 V, which is superior to those of most bifunctional electrocatalysts reported to date, predicting a promising application in metal-air batteries and fuel cells.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Liucheng Cao,Miao Chen,Yiming Zhang,Jingying Hu,Yi Wu,Ying Chen,Ruijia Wang,Haoyi Yuan,Fuxiang Wei,Yanwei Sui,Qingkun Meng,Lifeng Cheng,Shengqi Wang
Manganese-based cathodes are competitive candidates for state-of-the-art aqueous zinc-ion batteries (AZIBs) because of their easy preparation method, sufficient nature reserve, and environmental friendliness. However, their poor cycle stability and low rate performance have prevented them from practical applications. In this study, Mn 3 O 4 nanoparticles were formed in situ on the surface and between the interlayers of Ti 3 C 2 T x MXene, which was pretreated by the intercalation of K + ions. Ti 3 C 2 T x MXene not only provides abundant active sites and high conductivity but also hinders the structural damage of Mn 3 O 4 during charging and discharging. Benefiting from the well-designed K-Ti 3 C 2 @Mn 3 O 4 structure, the battery equipped with the K-Ti 3 C 2 @Mn 3 O 4 cathode achieved a maximum specific capacity of 312 mAh/g at a current density of 0.3 A/g and carried a specific capacity of approximately 120 mAh/g at a current density of 1 A/g, which remained stable for approximately 500 cycles. The performance surpasses that of most reported Mn 3 O 4 -based cathodes. This study pioneers a new approach for building better cathode materials for AZIBs.
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
ACS Catalysis
·
2020
·
IF 12.35
Yani Liu,Jun Luo,Lin Tang,Chengyang Feng,Jiajia Wang,Yaocheng Deng,Haoyu Liu,Jiangfang Yu,Haopeng Feng,Jingjing Wang
Manganese oxides and carbon materials are both desirable catalysts for persulfate (PS) advanced oxidation processes in environmental remediation. Nevertheless, manganese oxides suffer from low reusability while carbon materials face the problem of limited catalytic efficiency. For the purpose of making full use of the advantages of the two materials as well as avoiding their shortcomings, carbon-coated Mn3O4 composites (Mn3O4/C) with a regular nanocube structure were designed to activate PS for the removal of organics, and the catalytic processes were deeply investigated. The catalyst prepared at 400 °C with a precursor ratio (glucose/KMnO4) of 0.5 exhibited the best catalytic performance along with satisfactory reusability owing to the protection of the outer carbon layer. According to experimental results and density functional theory calculation, there were van der Waals interaction and a part of the strong attraction between the interface of PS and Mn3O4/C, which could be enhanced by inner Mn3O4 and thus promoted the electron transfer between PS and carbon shell, and the defective edges of the carbon layer with hydroxyl (C–OH) groups could act as active sites for PS activation. Radical (SO4•–, •OH) and nonradical (1O2) oxidation processes both participated in the degradation of 2,4-dichlorophenol, in which •OH was dominating. This study not only proposed a promising catalyst for the degradation of pollutants but also expanded research ideas for future PS activation mechanism studies by integrating the experiment and simulation.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chao Feng,Yuxi Bi,Chong Chen,Yunxia Wang,Shuangju Li,Yuan Pan,Hongchuan Xin,Yukun Lu,Fang Liu,Xuebing Li,Yunqi Liu,Runduo Zhang,Zhong Wang
Photothermal synergistic low-temperature catalytic volatile organic compounds (VOCs) degradation has an advantage on energy efficiency and reduction of carbon emissions. Herein, an impregnation-pyrolysis-oxidation strategy was adopted to synthesize Pd/Mn 3 O 4 heterojunction catalyst. Under photothermal synergistic conditions, 0.60Pd/Mn 3 O 4 catalyst exhibited an excellent activity for propane total oxidation, with a T 90 value of 219.1 ℃, which was 115.3 ℃ lower than that of Mn 3 O 4 . Enhancement effect of the heterojunction structure on photothermal synergy was detected by various characterization techniques and density functional theory calculation. The presence of Pd species enhanced the low-temperature reducibility of Mn 3 O 4 . Meanwhile, O 2 molecules were more easily activated at the Pd sites and overflow to the surface of Mn 3 O 4 for reaction. Besides, the formation of p-n junction between Pd species and Mn 3 O 4 in heterojunction structure promoted the charge separation and the migration of carriers, and boosted the generation of oxygen free radical, resulting in a significant improvement in photothermal catalytic activity. Overall, this study provided new strategy and deep insight for constructing heterojunction to enhance photothermal catalytic performance of VOC elimination.
研究领域:
环境科学
·
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Jean Claude Munyemana,Jia Chen,Hao Tang,Yangxia Han,Juanjuan Wang,Hongdeng Qiu
In this work, the inherent Fenton-like activity of Mn3O4 nanoparticles (Mn3O4 NPs) was explored to catalyze the polymerization of dopamine to blue-emitting polydopamine dots (PDA-dots), which can be used for selective detection of dopamine (DA) and tyrosinase (TYR). It was demonstrated that Mn3O4 NPs sparklingly oxidized DA to its quinone derivatives at the same time decomposing hydrogen peroxide to hydroxyl radicals that controlled the polymerization to PDA-dots. Interestingly, Mn3O4 NPs retained high activity to produce PDA-dots after repeated use of five cycles. It was found that with the polymerization of DA, the FL intensity of the produced PDA-dots changes in a dose-dependent on dopamine concentration. Therefore, under the optimum conditions, a turn-on fluorometric detection was thereby established to detect dopamine, showing a linear range of dopamine concentration from 0.050 μM to 300 μM. The Mn3O4 NPs-assisted preparation of fluorescent PDA-dots was further exploited to detect TYR by using tyramine as its model substrate. This simple strategy showed a limit of detection of 0.0048 U/mL toward TYR and displayed a linear response in the concentration range from 0.021 to 13.43 U/mL. Importantly, this study not only provides insight into how to quickly synthesize polydopamine dots that would be explored in biomedical applications but also establish a method to obtain highly discriminative and sensitive detection of dopamine and tyrosinase.
研究领域:
生物化学
·
医学检测
·
材料科学
✓ 已验证
DOI
高影响因子
NANO
·
2015
·
IF 1.09
Wen-Ting Li,Yu Wang,Fen-Fang Deng,Li-Li Liu,Hai-Jun Nan,He Li
A novel electrochemical immunosensor for determination of carcinoembryonic antigen (CEA) in human serum was fabricated by depositing Mo–Mn 3 O 4 /MWCNTs/Chits nanocomposite onto an indium-tin oxide (ITO) electrode. Mo-doped Mn 3 O 4 (MMO) was synthesized by sol–gel method and the presence of molybdenum improved its electrochemical properties. The MMO/MWCNTs/Chits nanocomposite could accelerate the electron transfer rate and enlarge the surface area to capture a large number of Carcinoembryonic Antigen (CEA). The factors influencing the performance of the immunosensor were investigated, such as incubation time, incubation temperature and pH. Under optimal conditions, the electrochemical immunosensor could detect CEA in a linear range from 0.1 ng ⋅ mL − 1 to 125 ng ⋅ mL − 1 with a detection limit of 4.9 pg ⋅ mL − 1 ( S ∕ N = 3 ). In addition, it exhibited high sensitivity and acceptable stability on a promising immobilization platform for signal amplification, which could be extended to other labeled recognition systems. This electrochemical immunosensor may provide potential applications for the clinical diagnosis.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·
IF 3.5
Zihao Hu,Xiaoying Zhou,Tiantian Zhang,Zuliang Wu,Jing Li,Wei Wang,Erhao Gao,Jiali Zhu,Shuiliang Yao
Aiming at the problem of the poor performance of an Mn-MOF-74-derived Mn3O4 catalyst in low-temperature carbon monoxide (CO) oxidation, copper (Cu) and cerium (Ce) elements were used to modify the Mn3O4 catalyst to improve its performance in low-temperature CO oxidation. According to the results of catalytic performance testing, the CO oxidation activity of the Cu0.3Mn2.7O4 catalyst was significantly improved compared with that of the pristine Mn3O4 catalyst, when a CO conversion rate of 90% was achieved at 118 °C. According to X-ray photoelectron spectroscopy and Brunauer–Emmett–Teller analyses, the (Mn2+ + Mn3+)/(Mn2+ + Mn3+ + Mn4+) ratio and the Oads/Ototal ratio increased after Cu doping, indicating promoted oxygen vacancy generation. In addition, the increased specific surface area was beneficial for the adsorption of reactant molecules and the exposure of active sites. According to H2-temperature-programmed reduction characterization, Cu doping significantly enhanced the performance of the Cu0.3Mn2.7O4 catalyst during low-temperature redox. Finally, these factors synergistically promoted the degradation of CO over the Cu0.3Mn2.7O4 catalyst. In addition, operando diffuse reflectance Fourier transform infrared spectroscopy results suggested the presence of more terminal-type oxygen, which is essential for the catalytic oxidation of CO on the surface of the Cu0.3Mn2.7O4 catalyst. Moreover, the Cu0.3Mn2.7O4 catalyst also showed excellent resistance to carbonate, and remarkable stability.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）