CERAMICS INTERNATIONAL
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2023
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IF 5.2
Ziyun Zhang,Hanghang Hui,Qian Chen,Zhiyuan Wang,Runguo Zheng,Hongyu Sun,Yanguo Liu
Mn-based layered oxides with high theoretical capacity are one of the most promising cathode materials for potassium-ion batteries. However, the Jahn-teller distortion of Mn 3+ in Mn-based layered cathodes always brings about harmful disordered structure and irreversible phase transition, resulting in severe degradation of electrochemical performance. Herein, we synthesized P3–K 0.5 Mn 0.6 Ni 0.2 M 0.2 O 2 (M = Fe, Co, FeCo) and systematically investigate the effect of component regulation on the layered structure and electrochemical properties. The P3–K 0.5 Mn 0.6 Ni 0.2 Co 0.2 O 2 exhibits a discharge capacity of 73.77 mAh g −1 , demonstrating an excellent capacity retention rate of 70.17 % after 120 cycles at 50 mA g −1 . In-depth analysis reveals that P3–K 0.5 Mn 0.6 Ni 0.2 Co 0.2 O 2 possesses a larger K + layer spacing, making the insertion/extraction of potassium ions become much easier. Furthermore, the introduction of Co into the transition metal layer enhances the content of Mn 4+ , thereby inhibiting Jahn-Teller distortion and improving structural stability. Especially, the P3–K 0.5 Mn 0.6 Ni 0.2 Co 0.2 O 2 shows a highly reversible single-phase solid solution reaction during the initial cycle, which means the detrimental phase transition of P3–O3 caused by Jahn-Teller effect is effectively suppressed. This work contributes to a better understanding of the effect of component design and regulation on the performance of the layered oxides cathode and provide insight into the design of high-performance cathode materials for potassium-ion batteries.
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LANGMUIR
·
2023
·
IF 3.9
Qiang Ma,Lijun Jiang,Bowen Yang,Bowen Xu,Qingyuan Wang,Qihong Wu,Ping Ning,Yingjie Zhang,Jin Huang,Jiming Hao
Gaseous thallium (Tl) pollution events, primarily caused by non-ferrous mineral refineries and fossil fuel combustion, have increased over the past few decades. To prevent gaseous Tl distribution from flue gas, MnO2/CeO2@HKUST-1 (MCH) was synthesized and found to achieve a gaseous Tl(I) removal level of up to 90% at 423 K, a weight hourly space velocity (WHSV) of 2000 h–1/mL with an Mn dose of 10%, maintained over 10 h. The best Mn/Ce ratio was found to be 9:1. To further investigate surface kinetic behavior, four commonly used kinetic models were applied, including the Eley–Rideal (ER) model, Langmuir–Hinshelwood (LH) model, Mars–van Krevelen (MVK) model, and pseudo-first-order (PFO) model. While the ER and LH models had the slightest deviation, the MVK model was the most reliable. The CatMAP software was also used to match the simulation deviation. This work demonstrated the Tl removal mechanism and provided insights into the accuracy of kinetic models on minor-radius heavy metal. Thus, this research may help promote the design of reactors, heavy metal removal rates, and flue gas purification technology selection.
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Journal of Water Process Engineering
·
2023
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IF 7
Longxiang Xia,Jing Shen,Dengfeng Wu
Herein, Al 2 O 3 supported ultra-small Mn-CeOx nanoparticles (Mn-CeOx/Al 2 O 3 ) are prepared by a facile impregnation method for removal of phenolic compounds via catalytic ozonation . Mn and Ce species are in the form of polyvalent oxide nanoparticles with an average size of 0.9 nm. The removal efficiency of total organic carbon for phenol-containing model wastewater by Mn-CeOx/Al 2 O 3 shows a volcano relationship by changing the mass ratio of Mn and Ce, and reaches up to the peak value when the mass ratio is 5:5. The cycle stability tests suggest the removal efficiency of Mn-CeOx/Al 2 O 3 could maintain at 90.16 % after 5 circles. The enhanced performance should be attributed to the optimized magnetism and accelerated charge transfer by composition regulation. The magnetic strength changing affects the adsorption mode of O 3 , while the redox cycle of Mn(IV)/Mn(III) and Ce(IV)/Ce(III) could enhance the activation of O 3 to produce more ·OH and 1 O 2 for the organic molecules mineralization.
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Coatings
·
2023
·Vol. 13
·期 7
·1246
·
IF 3.4
Wenjuan Qi,Desheng Ding,Weijie Luo,Weiliang Jin,Qian Kou,Chuntao Ge,Saijun Xiao
The hardness and wear resistance of amorphous Al–Mn alloy coatings can be improved by incorporating ceramic particles into them to extend their application. In this paper, Al–Mn/WC composite coatings have been prepared with electrodeposition in stirred AlCl3–NaCl–KCl–MnCl2molten salts at 180 °C with the addition of WC particles. The effects of stirring speed (400–700 rpm) and cathode current density (15–75 mA/cm2) on the produced Al–Mn/WC composite coatings have been studied. At 600 rpm and 700 rpm, the Al–Mn/WC composite coatings exhibited the best uniform distribution of the embedded WC particles, with the tested microhardness value up to 650 HV0.1, compared with 530 HV0.1of the Al–Mn alloy. Moreover, under various cathode current densities, the best quality of the Al–Mn/WC composite coating was obtained at 55 mA/cm2, with a homogeneous distribution of WC particles and the highest microhardness value (670 HV0.1). It is expected that this method could be extended to be applied for the preparation of aluminum-based and magnesium-based ceramic composite coatings.Keywords:AlCl3–NaCl–KCl–MnCl2molten salts;electrodeposition;WC particles;Al–Mn/WC composite coating
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OPTICS EXPRESS
·
2023
·Vol. 31
·期 15
·24914-24925
·
IF 3.8
Zitong Liu,Le Zhang,Le Zhang,Le Zhang,Le Zhang,Jian Kang,Jian Kang,Tianyuan Zhou,Tianyuan Zhou,Shiwei Chen,Shiwei Chen,Peng Yang,Bingheng Sun,Yang Li,Hao Chen,Hao Chen,Hao Chen
Ceramic phosphors are widely considered the next-generation phosphor material for white LED/LD lighting, and a wide spectrum is a key factor in improving the CRI of lighting sources. In this paper, a novel, to our knowledge, barcode-structured YAG:Ce/YAG:Ce,Mn ceramic phosphor was designed and fabricated. The lighting sources with the CRI value of 73.5 and 68.9 were obtained under the excitation of blue LEDs and blue LDs, respectively. Simultaneously, thanks to the effective supplementary emission from a red LD, the CRI of the ceramic-based lighting source reached 81.8 under blue LD excitation. Specifically, the microstructure and luminescent property of ceramic phosphors with different thicknesses and ion doping concentrations were systematically studied. Besides, by changing the blue power from 0.52 W to 2.60 W, the CCT of the laser lighting source with the encapsulation of optimized YAG:Ce/YAG:Ce,Mn ceramic phosphors ranged from 3928 K to 5895 K, while the CRI always maintained above 80. The above results indicate that barcode-structured Ce:YAG/Ce,MnYAG ceramic phosphor is a candidate to achieve a high CRI and ican be applied to various lighting occasions.
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JOURNAL OF SOLID STATE CHEMISTRY
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2023
·
IF 3.3
Bowen Dong,Yuqi Wan,Dan You,Qingrong Cheng,Zhiquan Pan
In order to alleviate the problem of water resource pollution, the exploration of visible-light driven excellent photocatalysts is an important issue for worldwide sustainable green energy systems. In this work, a novel binary hybrid nanocomposite WO 3 /Mn-ZIF-67 heterojunction photocatalyst was prepared through simple template method. It was based on the particular structure and performance of metal-organic framework (MOFs), and the structure of the heterojunction photocatalyst was expressed by SEM, TEM , FT-IR, DRS , XPS , PXRD and EIS . The novel WO 3 /Mn-ZIF-67 heterostructure showed more efficient photocatalytic properties for Tetracycline (TC) decomposition and hydrogen production than that of WO 3 monomer and Mn-ZIF-67 monomer under simulated light, respectively. Owing to the active radical catch and ESR experiments, a rational solid-state Z-model electron migration theory was rendered. Z-model mechanism can neatly be obligated to the raised degradative capacity of the photocatalytic reaction. The wonderful high-efficiency photocatalytic decomposability of heterojunction was mainly due to: (i) the WO 3 structure improved dramatically the light absorption efficiency of the photocatalyst. (ii) the doped Mn enhanced the photoelectric properties of ZIF-67. (iii) contact with the close interface between WO 3 and Mn-ZIF-67 produced efficient charge separation and migration.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Liang Zhaoheng,Tian Fei,Yang Gongzheng,Wang Chengxin
Aqueous sodium-ion batteries (AIBs) are promising candidates for large-scale energy storage due to their safe operational properties and low cost. However, AIBs have low specific energy (i.e., <80 Wh kg −1 ) and limited lifespans (e.g., hundreds of cycles). Mn-Fe Prussian blue analogues are considered ideal positive electrode materials for AIBs, but they show rapid capacity decay due to Jahn-Teller distortions. To circumvent these issues, here, we propose a cation-trapping method that involves the introduction of sodium ferrocyanide (Na 4 Fe(CN) 6 ) as a supporting salt in a highly concentrated NaClO 4 -based aqueous electrolyte solution to fill the surface Mn vacancies formed in Fe-substituted Prussian blue Na 1.58 Fe 0.07 Mn 0.97 Fe(CN) 6 · 2.65H 2 O (NaFeMnF) positive electrode materials during cycling. When the engineered aqueous electrolyte solution and the NaFeMnF-based positive electrode are tested in combination with a 3, 4, 9, 10-perylenetetracarboxylic diimide-based negative electrode in a coin cell configuration, a specific energy of 94 Wh kg –1 at 0.5 A g −1 (specific energy based on the active material mass of both electrodes) and a specific discharge capacity retention of 73.4% after 15000 cycles at 2 A g −1 are achieved.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Hanxu Lu,Zhe Hu,Hong Liu,Zizhao Fu,Hanqing Dai,Wanlu Zhang,Ruiqian Guo
Transition-metal-ion-doped quantum dots (QDs) are promising candidates to fabricate full-spectrum white-light-emitting diodes (WLEDs). In this work, a series of efficient white-light-emitting Cu,Mn-codoped ZnGaS/ZnS (Cu,Mn:ZnGaS/ZnS) QDs were synthesized by controlling the Zn/Ga molar ratio and the amounts of Mn dopants. After ZnS shelling, the photoluminescence quantum yield reached 58% and the spectrum almost covered the whole visible spectrum. Further, the stepwise doping process was investigated, which had considerable reference value to subsequent research. The Cu,Mn:ZnGaS/ZnS QDs were employed to fabricate WLEDs displaying a color rendering index of 94 and CIE coordinates of (0.34, 0.35).
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Yihang Qian,Yuan Chen,Guowei Yang
Manganese-contained Prussian blue analogues (Mn-PBAs) have a rigid and open 3D framework and adjustable redox potential , coupled with nontoxic nature, they could be effectively applied in various medicinal and biomedical fields. In this study, we reported the nanozyme activity of Mn-PBA nanoparticles . It was found that Mn-PBA nanoparticles possess peroxidase (POD)-, urate oxidase (UOD)- and catalase (CAT)-like enzymes, and this multi-enzyme activity is pH-switchable. The working mechanism of Mn-PBA nanoparticles mimicking peroxidase to oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H 2 O 2 ) was pursued. In this process, Mn-PBA nanoparticles accelerate the decomposition of H 2 O 2 into •OH, so that •OH catalyzes the oxidation of TMB. Based on the color reaction and the cascade reaction , we constructed a platform that utilizes Mn-PBA nanoparticles to detect alcohol concentration. This platform has a wide detection range and high detection accuracy, as well as excellent detection specificity. For example, 25 μM-2.5 mM concentration of alcohol can be measured accurately with a good linearity overall, and the limit of detection of the alcohol concentration can reach low to 3.17 μM. These studies prove that the application of Mn-PBA nanoparticles in biomedicine and detection has bright prospects.
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Sustainable Materials and Technologies
·
2023
·
IF 9.6
Miao Wang,Mei Lin,Gary Owens,Zuliang Chen
Recently, green synthetic technology has attracted much attention due to its low cost, waste-reuse and environmental friendliness. In this study, reduced graphene oxide/manganese nanoparticles hybrids (rGO/Mn NPs) were successfully synthesized utilizing green tea extract by one-step method. The rGO/Mn NPs were characterized by SEM-EDS, XRD , Raman, FTIR and BET, and the results indicate oxygen-containing functional groups in GO were effectively removed. Also, manganese nanoparticles (Mn NPs) were uniformly decorated on the rGO surface, and rGO/Mn NPs hybrids exhibited a lamellar sandwich structure, which was improve the specific surface area and provide more adsorption sites. The biomolecules in tea extract were further identified by GC–MS analysis, where showed that 1,2,3-trichlorophenol, caffeine and antioxidant were involved to the biosynthesis. Furthermore, the rGO/Mn NPs were used to simultaneously remove oxytetracycline/tetracycline (OTC/TC) with more than 90% of the removal efficiency, demonstrating that rGO/Mn NPs have a potential for treating antibiotic wastewater.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Qinghua Feng,Gang Wang,Liuheng Xue,Yingsha Wang,Meili Liu,Jia Liu,Shouting Zhang,Wenping Hu
Compared with natural enzymes, nanozymes have advantages such as high stability, low cost, and a broad application prospect. However, due to the low catalytic activity of conventional nanozymes, synthesizing nanozymes with excellent enzyme-like activity will be long-term work. Herein, we synthesized single-atom nanozymes centered on Mn with N, P, and S doped (Mn-SAzyme) with enhanced peroxidase-like (POD-like) activity. We found that the presence of the Mn metal center significantly increased the POD-like activity of the nanozyme, exhibiting catalytic properties consistent with Michaelis–Menten kinetics. The POD-like activity was measured to be 17.48 U/mg, which was higher than that of the sample without the metal center. Using methylene blue (MB) as the organic dye model, the degradation efficiency of Mn-SAzyme could reach 90.1% within 300 min at pH 6.5, within the H2O2 concentration of 0.1 M and 25 mg/L of nanozyme dosage. Free radical quenching experiments and electron paramagnetic resonance tests showed that •O2– and •OH were the key to degrading organic dyes. This work aims to explore more methods for synthesizing highly active nanozymes and successfully applying the synthesized nanozymes to the degradation of organic dyes.
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Biomaterials Science
·
2023
·
IF 6.6
Xingtai Huang,Zihan Wang,Shujie Li,Shiqi Lin,Lirong Zhang,Zhaowei Meng,Xuejun Zhang,Shao-Kai Sun
As Gd-based contrast agents suffer from the risk of causing nephrogenic systemic fibrosis, less toxic contrast agents are urgently needed in contrast-enhanced magnetic resonance imaging (CE-MRI) of kidney injury. Herein, we develop a non-invasive diagnosis method for acute kidney injury using CE-MRI based on manganese-doped carbon dots (Mn-CDs). The synthesized Mn-CDs possess an ultrasmall size of 5 nm, good biocompatibility, and a high T1 relaxation rate (10.8 mM−1 s−1), which can produce effective positive enhancement in the kidneys and clearly show the fine structures of the kidneys including the cortex, outer medulla, and inner medulla. In an acute kidney injury model, Mn-CDs-based CE-MRI can not only accurately and intuitively reveal the site of kidney injury consistent with the pathological analysis, but also reflect the functional changes in the injured kidney. Collectively, our study provides a new strategy for the non-invasive diagnosis of acute kidney injury using CE-MRI based on Mn-CDs.
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