JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 4.4
Tao Xiudan,Yang Xiaohan,Li Fufen,He Yuqing,Liu Chenhui,Dan Nianhua,Li Zhengjun
It remains challenging to prepare δ -MnO 2 catalyst with high catalytic performance by facile and low-energy green synthesis method. In this work, an ultrasonic-assisted method using plant-derived green reducing agents (quercetin, apigenin, and glucose) was employed to prepare δ -MnO 2 catalysts at room temperature. Due to the type and quantity of hydroxyl groups (phenolic or glycosyl), and the ultrasonic treatment time, the crystallinity and surface lattice defects, specific surface area, and surface Mn 3 + concentration are modulated, thereby effectively regulating the oxygen vacancies of the δ -MnO 2 samples. The results showed that the δ -MnO 2 -Q30 catalyst prepared with quercetin containing the highest number of phenolic hydroxyl groups exhibited outstanding catalytic activity and stability. Specifically, under static test conditions at room temperature, the removal efficiency of HCHO reached 96% within 30 min for approximately 1 ppm HCHO, and remained at 92% after five cycles. This indicates that the increase in the number of phenolic hydroxyl groups, along with appropriate reaction time, can improve the oxygen vacancies in the δ -MnO 2 structure, promote the activation of surface-adsorbed oxygen species, accelerate the generation of ROS, and thus facilitating the oxidative degradation of HCHO. Furthermore, EPR and in situ DRIFTS were employed to systematically detect ROS and reaction intermediates, elucidating that oxygen vacancy-induced ROS are the key factor for the conversion and oxidation of intermediates. This work provides new insights for further developing green synthetic δ -MnO 2 particles and enhancing their catalytic performance for formaldehyde removal at room temperature. Graphical
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SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Chunlei Yang,Wenping Deng,Haiyun Liu,Shenguang Ge,Mei Yan
A novel fluorescence sensor based on carbon dots–MnO 2 nanocomposites was fabricated successfully, which can detect glutathione (GSH) in aqueous solutions succinctly, rapidly and selectively. The carbon dots (CDs), which were synthesized by using organosilane as a coordinating solvent, had a highly luminescent quantum yield . The nanoflower-like MnO 2 had an enormous specific surface area, which could react with more CDs. Subsequently, CDs–MnO 2 nanocomposites were synthesized through a facile one-step method. As a result of fluorescence resonance energy transfer (FRET) from CDs to the MnO 2 , the fluorescence of CDs can be quenched by MnO 2 . However, when GSH was introduced into the system, the quenched fluorescence could be restored because MnO 2 was reduced to Mn 2+ by GSH, which led to the elimination of FRET. Compared with other electrolytes and biomolecules , we find that the chemical response of the CDs–MnO 2 nanocomposites exhibited good selectivity toward GSH. Under the optimal conditions, the proposed immunosensor was successfully performed with a linear range of 0.03–974.1 μmol L −1 , with a detection limit of 0.015 μmol L −1 . In addition, the proposed fluorescence sensor has several merits, such as low cost, good selectivity, great biocompatibility and chemical turn-on fluorescence response.
研究领域:
分析化学
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生物传感
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材料科学
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Advanced Science
·
2025
·Vol. 12
·期 34
·e04489
·
IF 14.1
Junyu Lu,Lei Xu,Cheng Xie,Chang Zhang,Zhaohui Han,Yiyao Ren,Renchao Che
The advancement of wireless communication technologies necessitates materials that absorb electromagnetic waves and shield against electromagnetic interference. The research is propelled by the necessity to develop materials that possess both properties. Here, an electromagnetic wave-absorbing material that synergistically regulates dielectric and magnetic properties is developed. The material features a nanowire fabric/multilayer composite structure of expanded graphite@α-MnO 2 (EG@MO). The manganese oxide nanowires are prepared in situ on the surface of multilayer expanded graphite via microwave-assisted hydrothermal synthesis. A rapid microwave activation process is subsequently performed to convert manganese oxide-hydroxide, elevating its oxidation state, and transforming it from a non-magnetic form to the magnetic α-MnO 2 . The EG@MO exhibits exceptional electromagnetic wave absorption capabilities, achieving a reflection loss value of −75.56 dB, with a low filler ratio of 7 wt.% and an ultrathin thickness of 1.48 mm. This high-performance electromagnetic absorption material, fabricated by integrating magnetic manganese dioxide nanowires with multilayer expanded graphite, shows excellent widespread applications.
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Chemical Engineering Journal Advances
·
2021
·
IF 0
Ting Zhou,Jiangkun Du,Zhijie Wang,Guangfeng Xiao,Liting Luo,Muhammad Faheem,Haibo Ling,Jianguo Bao
Contaminants destruction via advanced oxidation processes using catalyst and heat for peroxydisulfate (PDS) activation have been proven to be a feasible method in environmental remediation. Nevertheless, the synergistic activation of PDS by Mn-based catalysts and heat was barely reported in early investigations. In this study, we focused on a systematic investigation of PDS activation over manganese dioxide (MnO 2 ) under the assistance of heat for sulfamethoxazole (SMX) degradation. Effects of some key reaction parameters such as PDS concentration, MnO 2 dosage, initial pH and temperature were evaluated. The MnO 2 /heat/PDS synergistic system presented high performance on SMX degradation compared to the MnO 2 /PDS and heat/PDS systems. The degree of synergistic effect between MnO 2 and heat in the MnO 2 /heat/PDS system was calculated and it was 88.62%. Both SO 4 •− and • OH rather than 1 O 2 were detected to be responsible for SMX oxidation. Based on identified oxidation products by the liquid chromatography-quadrupole/time-of-flight mass spectrometry, the transformation pathways of SMX in MnO 2 /heat/PDS system followed mainly four major pathways (a) cleavage of S-N bond; (b) hydroxylation for benzene ring; and (c) dehydrogenation of the amino group. Moreover, MnO 2 could keep its excellent catalytic performance even after four consecutive oxidation cycles. Therefore, this paper advances the understanding of the synergy of MnO 2 with heat for enhanced PDS activation.
研究领域:
环境科学
·
化学工程
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IONICS
·
2022
·Vol. 28
·期 8
·3655-3659
·
IF 2.961
Zuo Zhaoyang,Dong Sanfeng,Meng Dongrong
Although the lithium-sulfur batteries have high specific capacity and energy density, it is still a challenge to achieve the wide commercial applications due to the severe polysulfide migration and poor electronic conductivity of the element sulfur. To this context, we developed porous carbon/MnO 2 (PCMO) composites as sulfur host materials to increase the adsorption ability between the PCMO host and polysulfide. The MnO 2 particles embedded on the porous carbon severe as active sites to effectively adsorb and catalyze the polysulfide, therefore improving the redox kinetics and reducing shuttle effect. More importantly, the porous structure of the carbon can provide pathways for the lithium-ion diffusion, which accelerates the ion transport through the electrode. Owing to these merits, the as-prepared PCMO/S cathode exhibits high capacity, stable cycle performance and excellent rate capability.
研究领域:
储能
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材料科学
·
电化学
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JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Abdul Rehman Akbar,Adil Saleem,Abdur Rauf,Rashid Iqbal,Muhammad Tahir,Gangqiang Peng,Abdul Sammed Khan,Arshad Hussain,Muhammad Ahmad,Mansoor Akhtar,Mumtaz Ali,Chuanxi Xiong,Quanling Yang,Ghaffar Ali,Fude Liu
Advanced flexible supercapacitors with high energy/power density are an imperative research objective. In this study, a dually activated carbon cloth is designed as the functional current collector for supercapacitors. An electrodeposition technique is used for engineering Manganese Dioxide (MnO 2 ) nanoflakes and profiting from a Poly (3,4 ethylene dioxythiophene; PEDOT) shield layer, a Li + -based neutral electrolyte high-performance freestanding asymmetric supercapacitors is constructed. The activated carbon cloth (ACC) provides an efficient electron-carrying route and the hierarchical nanostructure of the ACC@MnO 2 @PEDOT electrode. The integrated ACC@MnO 2 @PEDOT electrode exhibited exceptional capacitance performance of 1882.5 mF cm −2 (current density 1 mA cm −2 ) in 1.5 M aqueous LiCl electrolyte benefiting from ACC scaffold, the pseudocapacitive activity of MnO 2 and substantial conductivity of the PEDOT polymer. Fabricating the structured electrode into an asymmetric supercapacitor revealed an enhanced areal energy density and an areal power density. The fabricated device demonstrated a broad voltage window of 1.8 V and extraordinary cycling stability of 94.6% after 10000 charge-discharge cycles. The unique scaffold, conducting PEDOT polymer, and MnO 2 nanoflakes synergistically improved the cyclic performance and rate proficiency of the electrode, resulting in a supercapacitor with bendable electrical energy storage applications.
研究领域:
材料科学
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电化学
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能量存储
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纳米技术
·
柔性电子学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jihong Bian,Kangning Wang,Jinbo Zhang,Yanzhong Zhen,Jianwei Wang,Yaodong Yang,Feng Fu
Shortage of energy and computing power puts forward requirements for developing multifunctional devices. Inherent defects greatly limit the development of transition metal oxides as promising candidate for energy storage and memory applications. We propose a facile strategy to modify MnO 2 via controlling the doping amount of Co, effectively regulating the structural, magnetic and electrical properties. The 15.78 %Co-MnO 2 is nano-flower-like in δ phase with a specific surface area of 123.86 m 2 g −1 and rich oxygen vacancies. Its corresponding memristors exhibit stable and repeatable, sweep speed-dependent and voltage magnitude-dependent volatile bidirectional threshold switching behavior with high switching ratio of 10 4 over 1100 cycles, which is attributed to the formation and rupture of conductive filaments formed by a large number of oxygen vacancies and a small number of Co ions under the electric field. By controlling the applied voltage and compliance current, multilevel resistance states are shown. Besides, 15.78 %Co-MnO 2 also exhibits excellent zinc storage performance, due to its large specific surface area, nano-sized structure and abundant oxygen vacancies. This work lays a foundation for developing high-performance and low-dimensional memristor devices and capacitors, and paves a way for low-power multifunctional devices.
研究领域:
材料科学
·
电子工程
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高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Zhao Jie,Zou Xilai,Sun Peng,Cui Guofeng
A three-dimensional bi-continuous nanoporous gold (NPG)/nickel foam is developed though the electrodeposition of a gold–tin alloy on Ni foam and subsequent chemical dealloying of tin. The newly-designed 3D metal structure is used to anchor MnO 2 nanosheets for high-performance supercapacitors. The formed ternary composite electrodes exhibit significantly-enhanced capacitance performance, rate capability, and excellent cycling stability. A specific capacitance of 442 Fg −1 is achieved at a scan rate of 5 mV s −1 and a relatively high mass loading of 865 μg cm −2 . After 2500 cycles, only a 1% decay is found at a scan rate of 50 mV s −1 . A high power density of 3513 W kg −1 and an energy density of 25.73 Wh kg −1 are realized for potential energy storage devices. The results demonstrate that the NPG/nickel foam hybrid structure significantly improves the dispersibility of MnO 2 and makes it promising for practical energy storage applications.
研究领域:
材料科学
·
能源存储
·
纳米技术
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yuhong Bi,Amit Nautiyal,Huaiping Zhang,Hong Yan,Jujie Luo,Xinyu Zhang
MnO 2 nanowires/graphite nanocomposites (MnO 2 -NW@Graphite) were successfully manufactured by an ultrafast, facile and cost-effective solid-state approach using microwave energy. Intensive research was conducted to investigate the effects of the material mass ratio, the microwave power and the microwave exposure time on the yield and morphology of the MnO 2 -NW@Graphite nanocomposites. The effect of the heating layer on the morphology was also studied. The morphology and structure of the nanocomposites were characterized using scanning electron microscope (SEM), X-ray power diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and thermal gravimetric analysis (TGA). In addition, the electrochemical performances of the MnO 2 -NW@graphite nanocomposites were evaluated in basic media using 1 M potassium hydroxide (KOH). The prepared nanocomposites exhibit a maximum specific capacity of 380.4 F/g at a current density of 1 A/g. The composites show high rate capabilities and good long-term stability with approximately 80% (303.57 F/g) retention of capacitance after 2000 cycles. With the low mass percentage (12.9%) of MnO 2 nanowires in MnO 2 -NW@Graphite, its outstanding electrochemical performance shows that it is a promising electrode material for supercapacitors . In addition, this microwave assisted approach towards the fabrication of MnO 2 nanowires is expected to achieve mass production for inexpensive energy materials.
研究领域:
材料科学
·
能源存储与转换
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高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Xinsheng Luo,Heng Liang,Fangshu Qu,An Ding,Xiaoxiang Cheng,Chuyang Y. Tang,Guibai Li
Catalytic membrane, due to its compact reactor assembling, high catalytic performance as well as low energy consumption, has proved to be more attractive for wastewater treatment . In this work, a free-standing α-MnO 2 @CuO membrane with hierarchical nanostructures was prepared and evaluated as the catalytic membrane to generate radicals from peroxymonosulfate (PMS) for the oxidative degradation of organic dyes in aqueous solution. Benefiting from the high mass transport efficiency and the hierarchical nanostructures, a superior catalytic activity of the membrane was observed for organic dyes degradation. As a typical organic dye, more than 99% of methylene blue (MB) was degraded within 0.23 s using dead-end filtration cell. The effects of flow rate, PMS concentration and buffer solution on MB degradation were further investigated. Besides MB, the catalytic membrane also showed excellent performance for the removal of other dyes, such as congo red, methyl orange, rhodamine B, acid chrome blue K and malachite green. Moreover, the mechanism study indicated that OH and SO 4 - generated from the interaction between PMS and Mn/Cu species with different oxidation states mainly accounted for the dyes degradation. The catalytic filtration process using α-MnO 2 @CuO catalytic membrane could provide a novel method for wastewater purification with high efficiency and low energy consumption.
研究领域:
环境科学
·
材料科学
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Huai Liu,Xuejuan Cao,Junnan Wei,Wenlong Jia,Mengzhu Li,Xing Tang,Xianhai Zeng,Yong Sun,Tingzhou Lei,Shijie Liu,Lu Lin
It is challenging to effectively convert 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF), a flexible biobased building-block, over non-noble metal catalysts. In this contribution, Mn–Fe oxides were prepared and served as highly active catalysts for the selective oxidation of HMF to DFF. Among Mn–Fe oxides with varied Mn–Fe molar ratios, Mn6Fe1Ox showed the best catalytic activity and offered HMF conversion up to 97% with a DFF selectivity of 98% (110 °C, 5 h, and 1.5 MPa O2). It is revealed that the introduction of α-Fe2O3 resulted in significant enhancement in the amount of catalytic active sites (Mn4+–O2– pairs) and their activity in Mn6Fe1Ox for the dehydrogenation of HMF to DFF. Mn6Fe1Ox also was a robust catalyst that could be successively used at least six times without substantial loss in its catalytic activity. Furthermore, a facile two-step process for the conversion of fructose to DFF with a yield up to 80% was developed by the integration of dehydration and oxidation over Amberlyst-15 and Mn6Fe1Ox, respectively.
研究领域:
化学工程
·
催化化学
·
生物质转化
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高影响因子
Progress in Natural Science-Materials International
·
2019
·
IF 3.31
Shiwei Liu,Kai Li,Xuebin Zheng
A facile UV-photolysis method has been developed to synthesize birnessite-type MnO 2 nanosheets on carbon film at room temperature for supercapacitor electrode materials. The results clearly demonstrated that the specific capacitance of carbon/MnO 2 composite electrodes was controlled by the adjustable UV-photolysis reaction time in KMnO 4 solution. For the optimized composite electrode obtained after 2 h reaction, a superior specific capacitance of 277 F g −1 was achieved at current density of 0.2 A g −1 . This finding suggests that UV-photolysis is a potential method to fabricate MnO 2 on carbon film for supercapacitor.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）