COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yanmei Li,Jing Wang,Ziyang Xiang,Junhui Yang,Jinglin Yin,Xin Guo,Wenlei Wang
In this study, a carbonized aerogel (CA) decorated with Mn-FeOOH hybrid nanoparticles was prepared and has been used as a better heterogeneous photo-Fenton catalyst. Mn doping accelerated the regeneration of Fe 2+ and promoted the decomposition of H 2 O 2 while producing many hydroxyl radicals (·OH), which solved the mass transfer problem in the traditional heterogeneous Fenton system. The amount of·OH in the Mn-FeOOH@CA/H 2 O 2 system within 40 min was 2.4 times higher than that in the FeOOH@CA/H 2 O 2 system, which further indicates that·OH was the main active species. High-porosity CA has been designed as an electron transport channel. During photocatalysis , electron transfer occurred between the Mn-FeOOH composite material and CA. The Fe 2+ could be used as reaction sites to promote the activation of H 2 O 2 on the surface of 1-Mn/FeOOH, and achieved 100 % As(III) degradation efficiency within 25 min. The catalyst maintained more than 80 % of its original oxidation capacity after five cycles of experiments, which indicates that it has good durability. This work is expected to provide rational design of heterometallic doped materials with oxygen vacancies to treat arsenic pollution.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 1
·513-526
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IF 4.186
Bingheng Sun,Benxue Jiang,Jintai Fan,Le Zhang,Long Zhang
Red-emitting color-convertors have attracted considerable attention for promising applications in solid-state lighting (SSL) to improve color rendition. However, the current nitride and fluoride phosphor powders have encountered several challenges, such as high cost, narrow emission bands, and insufficient stability during operation, which limit the development of high-power full-spectrum SSL. In this study, thermally robust Gd 3 (Al,Ga) 5 O 12 :Mn (GAGG:Mn) solid-solution ceramics (SSCs) with dual wavelength red-emission bands were prepared via an oxygen solid-state sintering reaction. The doped Mn ions occupied octahedral Al 3+ and Ga 3+ sites to generate Mn 4+ luminescent centers with pronounced deep-red emissions peaking at 698 nm ( 2 E → 4 A 2 ), and Mn 2+ luminescent centers with broad red emissions at 628 nm ( 4 T 1 → 6 A 1 ). Because the cationic radius matching effect induced the regulation of valence state of Mn, the photoluminescence of the GAGG:Mn SSCs can be tailored by the substitution of Al 3+ with Ga 3+ . Moreover, the Mn 3+ also existed in the GAGG lattice host, and their concentration decreased with increasing Ga 3+ contents owing to the mismatch of ionic radius between Mn 3+ and Ga 3+ ions. With the optimization of Al/Ga ratio and concentration of Mn ions, a broad emission band ranging from 550 to 800 nm (bandwidth = 250 nm) was achieved from Gd 3 Al 3 Ga 2 O 12 :0.3%Mn SSCs upon 465-nm excitation. Moreover, the GAGG:Mn SSC has over 17-fold enhanced thermal conductivity compared with the corresponding phosphor powder. This paper opens a door of regulating the valence state of luminescence centers with cation substitution and the application of oxide red-emitting color-convertors.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Huaiyang Chen,Xiaoping Shen,Zhenyuan Ji,Jia Cheng,Guangxiang Liu,Leiming Lang,Yao Chen
In this paper, porous Mn 3 O 4 –Fe 3 O 4 nanoparticles with highly uniform composition are in-situ anchored on reduced graphene oxide (rGO) nanosheets by a simple cyanometallic framework template method . Thanks to the synergistic effects between the porous Mn 3 O 4 –Fe 3 O 4 nanoparticles and the well-conductive rGO nanosheets, the Mn 3 O 4 –Fe 3 O 4 /rGO composites present superior electrochemical lithium storage performances with a great reversible capacity of 1013 mAh g −1 after 100 cycles at 0.1 A g −1 , satisfactory rate capability of 510 mAh g −1 at 3.0 A g −1 , and eminent long-term cycle stability of 804 mAh g −1 after 500 cycles at 0.5 A g −1 . It is demonstrated that the rGO can not only act as a conducting matrix, but also buffer the volume expansion and avoid the aggregation of the Mn 3 O 4 –Fe 3 O 4 nanoparticles during charging-discharging. The work provides a simple strategy for designing and fabricating advanced multi-component metal oxide-based anodes for high-performance lithium-ion battery.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Jing Wu,Jiabing Li,Gary Owens,Zuliang Chen
The widespread use of antibiotics, such as oxytetracycline (OTC) and levofloxacin (LEV), has led to dangerous levels of environmental contamination. In this study, functionalized iron/manganese nanoparticles (Fe/Mn NPs), which act as both adsorbent and Fenton catalyst, were green-synthesized using a reducing agent derived from a tea extract. The resulting pre-sorption/Fenton-like oxidation system effectively removed both OTC and LEV from the aqueous solution with adsorption capacities of Fe/Mn NPs for OTC and LEV of 58.8 and 192.3 mg·g −1 , respectively. In addition, Fe/Mn NPs also showed high catalytic activity, oxidizing more than 99.9 % of both OTC and LEV, while sodium persulfate (PDS) removed only 26.6 and 29.0 % of OTC and LEV, respectively. Mechanisms of PDS activation typically involve either catalyst-initiated or mediated electron transfer reactions. Fe/Mn NPs through heterogeneous catalytic and metal leaching-induced homogeneous Fenton reactions, which generated various reactive oxygen species (ROS) including 1 O 2 , ·OH, SO 4 - · and ·O 2 – . Characterization of Fe/Mn NPs before and after reaction, and the identification of specific OTC and LEV degradation products by LC-MS, helped to elucidate a potential degradation pathway, as well as the removal mechanism. Finally, the practicality of using this system for wastewater treatment was demonstrated using real wastewater samples indicating that the system has great potential for simultaneously degrading both OTC and LEV in contaminated wastewater.
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高影响因子
IONICS
·
2022
·Vol. 29
·期 1
·43-50
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IF 2.961
Zhang Bao,Zhang Yannan,Duan Jianguo,Li Xue,Zeng Xiaoyuan,Zhou Kai,Wang Zhengwu,Lian Zheng,Dong Peng,Zhang Yingjie
As one of the most potential positive materials for cobalt-free lithium ion batteries, the lithium manganate cathode materials are extremely attractive because of their low-cost and low toxicity compared to other cathode materials, but they still suffer from the serious capacity fading because of the transition metal dissolution (Mn). Herein, a layer of Gd 2 O 3 coating is coated on the surface of lithium manganate by a simple wet chemical method. The Gd 2 O 3 coating can reduce the side reactions as well as Mn dissolution by suppressing the direct contact between the electrolyte and the positive electrodes. Consequently, the modified spinel LiMn 2 O 4 @Gd 2 O 3 electrode has delivered significantly improved electrochemical performance. ICP measurements demonstrate that the amount of manganese dissolved in electrolyte is effectively decreased, which is approximately one-third of the pristine sample. Thus, the LiMn 2 O 4 @Gd 2 O 3 provides higher capacity retention at both low current density (1 C) and high current density (5 C). This work reveals that the Gd 2 O 3 coating is a straightforward but effective strategy of enhancing the structural stability and inhibition of Mn dissolution of spinel Mn-based positive electrodes.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Zhijie Zhang,Simin Chen,Sipeng Chen,Zeyu Yuan,Yanxiong Fang,Dai Dang,Yuying Zheng
Designing an electrocatalyst for hydrogen production from water splitting that is highly efficient, stable, and free of noble metals is necessary but challenging. The phosphorus compound is considered a viable candidate for producing hydrogen from water split, but its electrocatalytic performance needs further improvement. Herein, we present an easy and straightforward method for constructing Mn-doped Co 2 P yolk-shell lychee spheres. The Co nano prisms are used as a self-sacrificing template to conduct an ion exchange reaction with manganese ions, constructing Co oxide yolk-shell spheres with Mn–Co hydroxide nano-blocks. After in-suit phosphating at low temperature, Mn-doped Co 2 P with yolk-shell structure and lychee morphology is formed. The Mn-doped Co 2 P with an optimized Mn and Co molar ratio (0.125) exhibits excellent hydrogen evolution performance in alkaline and acidic electrolyte. The overpotentials can reach 10 mA cm −2 at 98 mV and 72 mV, respectively, and the Mn–Co 2 P-0.125 catalyst has faster electron transfer efficiency and larger electrochemically active surface area. The experimental results ascertain that doping an appropriate amount of Mn significantly changes the morphology and structure, thereby affecting the exposure of active sites, and modulating the electronic structure around Co 2 P. Under the dual regulation of morphology and electronic structure, the electrocatalytic process is accelerated, enhancing its catalytic activity .
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 34
·2204499
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IF 19.924
Yue Liu,Xinfeng Zhou,Zirui Jia,Hongjing Wu,Guanglei Wu
Polymeric metal-organic framework (MOF)-derived composites are promising functional materials because of their exceptional chemical homogeneity, designable components, and adjustable pore size. The modulation of oxygen and Mn vacancies via the introduction of heteroatoms and changes in the annealing temperature in MOFs-derived composites can be a possible solution to investigate the polarization loss mechanism, which facilitates the improvement of electromagnetic loss capacity. Herein, the design of laminate-stacked sphere-shaped trimetallic CoNiMn-MOFs is presented. The derived CoNi/MnO@C composites retain the original topography of the MOFs. The concentration of oxygen vacancies increases with the incorporation of heteroatoms, but decreases with annealing temperature, which prevails in the polarization loss mechanism rather than the contribution of Mn 2+ vacancies and heterogeneous interfaces. Therefore, the minimum reflection loss of the CoNi/MnO@C sample demonstrates −55.2 dB at 2.6 mm and the broad effective absorption bandwidth reaches 8.0 GHz at 2.1 mm. This work is expected to provide meaningful insights into the significant effect of ion vacancy modulation on the EM wave-absorbing performance of Mn-based MOFs-derived composites.
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BIOSENSORS & BIOELECTRONICS
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2022
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IF 12.545
Xiang Lai,Yue Shen,Shoubei Gao,Yajing Chen,Yanshuai Cui,Dongxue Ning,Xianbing Ji,Zhiwei Liu,Longgang Wang
The selective detection of glutathione (GSH) has been used as important colorimetric probe for human health. Herein, we used a facile method to synthesize manganese ions modified porphyrin metal-organic framework (PCN-224-Mn) with a size of 125.7 ± 14.2 nm and zeta potential of −3.9 ± 0.5 mV. We showed that PCN-224-Mn catalyzed oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in the absence of H 2 O 2 , resulting in a blue-colored oxidized TMB (oxTMB) that exhibits oxidase-like activity. Furthermore, a simple colorimetric detection method for GSH was developed based on the oxidase-like activity of PCN-224-Mn. This method shows wide linear detection range of 0.5–60 μM for GSH with a much lower detection limit of 0.233 μM. Finally, the recovery of colorimetric sensor of PCN-224-Mn suggests its great potential as a biosensor. As the catalytically active site, the manganese porphyrin unit plays a major role in the oxidase-like property and detection ability of PCN-224-Mn. Our data suggest that GSH detection method using PCN-224-Mn has great potential in multiple applications in the future.
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高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 24
·245701
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IF 3.953
Ziyan Kong,Huiying Wang,Kun Hou,Lunhui Guan
The research on low-cost, high-performance non platinum group metal (PGM) oxygen reduction reaction (ORR) catalysts is of great significance for the rapid promotion of fuel cells' practical applications. In this work, Mn–N–C catalyst with outstanding activity was prepared through using hydrogel formed by coordination of sodium alginate (SA) and Mn2+ as the precursor. During the preparation process, g-C3N4 was added to improve the surface area enrich the pore structure of catalysts, as well as to function as the nitrogen source. Compare with commercial Pt/C catalyst, the optimum Mn–N–C catalyst possesses extraordinary ORR activity in alkaline electrolytes, with a half-wave potential (E1/2) of 0.90 V. In addition, the Mn–N–C catalyst also displays exceptional stability in alkaline and acidic electrolytes, much superior to Pt/C catalyst.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Yanrui Hao,Hao Guo,Fan Yang,Junye Zhang,Ning Wu,Mingyue Wang,Cuiliu Li,Wu Yang
Multi-walled carbon nanotube (MWCNT)/Ni-Mn-S composites are derived from MWCNT/Ni/Mn bimetallic metal-organic framework (MOF) for supercapacitor electrodes. Electroconductive MWCNT is introduced into Ni-Mn-S to form a three-dimensional interconnected structure due to the covalent interaction between Ni atoms and C atoms. During energy storage, MWCNT serves as miniature current collector to shorten pathway of electron collection and transmission. In addition, S 2- etching agent with Kirkendall effect makes edges and surfaces of the resulted sulfide structures rougher provide more active sites and improves electrochemical performance compared with precursors. By finely adjusting Ni/Mn molar ratio, the prepared MWCNT/Ni-Mn-S composite achieves excellent properties. As-prepared MWCNT/Ni-Mn-S(3:2) exhibits high specific capacitance of 1041 mAh g −1 at 1 A g −1 and good cyclic stability. The capacitance retention reaches 83.3% after 10,000 cycles. The assembled MWCNT/Ni-Mn-S(3:2)//AC hybrid supercapacitor (HSC) also shows high energy density of 25.33 Wh Kg −1 at power density of 829 W Kg −1 and outstanding cycling stability (93.3% after 20,000 cycles), which illustrates MWCNT/Ni-Mn-S(3:2) has important potential in supercapacitor.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Rui Zhang,Changlin Liu,Ruoxi Zhao,Yaqian Du,Dan Yang,He Ding,Guixin Yang,Shili Gai,Fei He,Piaoping Yang
There is an urgent need to develop photosensitive nanoenzymes with better phototherapeutic efficiency through simple processes. By exploiting semiconductor catalysis and defect chemistry principles, herein, a MnMoO x composite semiconductor nanoenzyme was developed to achieve a fully integrated theranostic nanoenzyme for highly efficient photo/chemo-enzyme-dynamic eradication of deep tumors. Relative to iron oxides, manganese oxides offer ideal catalytic performance under near-neutral conditions, which helps to broaden the suitable pH range of the MnMoO x nanoenzyme for antitumor therapy. Furthermore, with the assistance of glutathione depletion, Mn 4+ /Mo 6+ was successfully converted to Mn 2+ /Mo 5+ , inhibiting the scavenging of reactive oxygen species (ROS) and promoting cycling. Therefore, MnMoO x has favorable catalase (CAT)-like activity and oxidase (OXD)-like activity in the tumor microenvironment (TME) for promoting the “H 2 O 2 O 2 O 2 − ” and “H 2 O 2 OH” cascade reactions. The abundant oxygen vacancy defects also promote the surface plasmon resonance (SPR) effect in the second near-infrared (NIR-II) window of MnMoO x , which significantly enhanced its photothermal therapy (PTT) effect and catalytic activity. In detail, ROS production was significantly enhanced due to the adsorption of water and oxygen molecules by the rich oxygen vacancies of MnMoO x . MnMoO x also exhibited excellent multi-modal imaging activity (including computed tomography (CT), magnetic resonance imaging (MRI), and photoacoustic (PA)), which can be exploited to better guide the administration of medication.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Chunxiao Zhang,Yingjie Li,Zirui He,Jianli Zhao,Dong Wang
Herein, a hollow microtubular Fe/Mn-promoted CaO-Ca 12 Al 14 O 33 bi-functional material was prepared by the bio-template method and used for H 2 production from sorption enhanced water gas shift (SEWGS). The microtubular Fe/Mn-promoted CaO-Ca 12 Al 14 O 33 exhibits excellent CO 2 capture and H 2 production performance in SEWGS/regeneration cycles. The stable hollow microtubular structure improves available adsorption and catalytic sites in Fe/Mn-promoted CaO-Ca 12 Al 14 O 33 for CO 2 capture and H 2 production. Mn addition improves CO 2 affinity capacity of the microtubular material. The Fe-Mn interaction increases redox ability of Fe 3+ /Fe 3+, 2+ , which promotes CO conversion. Moreover, the formed Ca 2 Fe 2 O 5 and Ca 2 MnO 4 both increase oxygen vacancies to promote catalytic activity of the microtubular material for WGS and its CO 2 capture capacity. The CO conversions for the microtubular material with the Fe/Mn/Al/Ca molar ratio= 10/2/10/100 are 98.7% and 94.0% after 20 cycles under the mild and severe calcination conditions, respectively. The hollow microtubular bi-functional material shows good prospect for efficient H 2 production from SEWGS.
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