APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Hong Liang,Qiang Zheng,Kaibin Zhang,Youli Yang,Ran He
Mesoporous 10CeO x /MnO x -Y catalysts were successfully prepared by doping Ce and calcining Mn-BTC (BTC = 1,3,5-benzenetricarboxylate) for ozone catalytic decomposition. The 10CeO x /MnO x -300 catalyst exhibited the highest catalytic activity under the relative humidity (RH) range from less than 5–65 %, giving 100 % conversion of 40 ppm O 3 after 6 h. Series of physicochemical characterizations including XRD, TG, SEM, HR-TEM, ICP-OES, BET, XPS and H 2 -TPR were introduced the relationship of calcination temperature, catalysts structure and ozone catalytic performance. The results demonstrated that the 10CeO x /MnO x -300 catalyst had the highest Mn 3+ /Mn 4+ and O ads /O latt ratios and the largest specific surface compared with those of other samples, which are crucial to decompose ozone. In addition, better dispersion of crystals, larger pore volume, more oxygen vacancies, and better low-temperature reducibility are also conducive to ozone decomposition. This research establishes the basis for the application of manganese-based MOFs for ozone decomposition.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Dewei Liu,Qijie Zhang,Saipeng Ding,Fufeng Yan,Haiyang Dai,Tao Li,Renzhong Xue,Jing Chen,Gaoshang Gong,Cui Shang,Xuezhen Zhai
A series of nano-V 1- x Mn x O 2 samples ( x = 0–0.035) were prepared by a simple solvothermal method. XRD patterns and the Rietveld refinement results of V 1- x Mn x O 2 samples showed that Mn ions were incorporated into the V sites during the solvothermal process. XPS results indicated that the valence state of Mn ion was a mixed state of Mn 2+ , Mn 3+ and Mn 4+ . The corresponding relationship between the diameter, specific surface area and electrochemical performances of V 1- x Mn x O 2 nanorods was studied. It can be found that Mn doping promoted the insertion of K + ions into the electrode material and improved the conductivity, discharge capacity and cycle stability, which was due to more defects induced by Mn doping. The x = 0.020 sample had the largest specific capacitance (the 88% capacity retention rate after 550 cycles at 0.1 A·g −1 ) due to the improvement of structural stability by Mn-ion doping. These results provide great potential applications for nano-VO 2 (B) in the cathode material of lithium-ion battery and supercapacitor .
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高影响因子
Inorganic and Nano-Metal Chemistry
·
2021
·
IF 1.716
Changsheng Qu,Hao Zhou,Dongyao Xu,Jiaojiao Guo,Danyang Zhao,Xuewei Guo,Luyuan Xing
In this study, the manganese was loaded on three different zirconia crystal types by ultrasonic impregnation method, and the performance of selective catalytic reduction (SCR) of NOx with NH3 was tested. The characteristics of the catalytic were tested by BET, XRD, SEM, and XPS. It was founded that the performances of unloaded different crystal zirconia was basically the same which were less than 40%. Compared with unloaded catalyst, the DeNOx performance of catalysts after loaded manganese was greatly improved, and the crystal type had obvious influence on the DeNOx performance of Mn/x-ZrO2. The Mn/m-ZrO2 had the highest DeNOx performance (90.97% at 240 °C) compared with the Mn/t-ZrO2 and Mn/c-ZrO2. The difference of crystal type made Mn/m-ZrO2 have lower surface Mn average valence states and more oxygen vacancy, which made it have best DeNOx performance. The effects of SO2, H2O, and alkali metal on DeNOx efficiency were also tested.
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高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Xianwei Bai,Haizheng Zhong,Bingkun Chen,Cheng Chen,Junbo Han,Ruosheng Zeng,Bingsuo Zou
Pb-free inorganic–organic perovskite materials - C10H12N2MnBr4 (compound 1) and C5H6NMnBr3 (compound 2) - with different structures were obtained by using pyridine and manganese bromide as raw materials. The single-crystal X-ray diffraction analyses revealed their different lattices in space groups. Compound 1 - Mn tetra-Br-coordinated with two pyridines - presented an isolated mononuclear structure. Its temperature-dependent photoluminescence spectra exhibited an emission band at 523 nm from the lowest d–d crystal field transition of Mn and a higher energy emission at 493 nm from its vibronic state at low temperature. Compound 2 - Mn octahedra-Br-coordinated with a minor pyridine - face-shares with linear chains, which were separated by pyridine molecules. Its emission peak occurred at around 650 nm, in which ferromagnetism was observed. The lifetimes of d–d transition for a single manganese ion and the Mn cluster were presented.
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高影响因子
Advanced Physics Research
·
2022
·Vol. 2
·期 4
·2200071
·
IF 0
Weifan Niu,Ruidan Zhang,Zhibin Wang,Feng Huang,Daqin Chen
Perovskite nanocrystals (NCs) with intentionally introduced Mn 2+ /Yb 3+ activators enable tunable emissions covering UV-orange-NIR spectral range. However, the exact microscopic energy transfer mechanisms in this system remain unknown. Herein, Mn/Yb codoped CsPbCl 3 perovskite NCs with triple emissions originated from exciton recombination of host, 3d–3d transition of Mn 2+ and 4f–4f transition of Yb 3+ are prepared. Femtosecond resolution transient absorption spectra performed on the pristine CsPbCl 3 , Mn-doped, Yb-doped and Mn/Yb codoped samples clarify efficient and simultaneous energy transfer (ET) from excitons to Mn 2+ and Yb 3+ dopants. It is testified the sensitizations of dopants mainly result from the trapped hole, taking 285 ps for Mn 2+ and 17 ps for Yb 3+ respectively, which make less trapped hole recombine with de-localized carriers. Importantly, energy transfer processes from host to Mn 2+ and Yb 3+ activators emerge as competition, and the ET probability of exciton-to-Mn 2+ is higher than that of exciton-to-Yb 3+ . Finally, control experiments further prove that tunable Mn 2+ orange emission and Yb 3+ NIR emission are achievable via elaborate adjustment of the dopant concentrations.
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Processes
·
2022
·Vol. 10
·期 10
·1946
·
IF 3.352
Hong Shen,Zijun Tang,Xiang Xiao,Haiwen Wu,Hang Zhou,Ping Fang,Dingfang Zhu,Jianhua Ge
In this study, Mn-Ce/Al2O3/TiO2catalyst prepared by impregnation method was used for synergistic O3oxidation NO. The catalyst prepared by impregnating Al2O3/TiO2at a Mn:Ce molar ratio of 4:1 showed the best catalytic activity. The catalyst performance showed that when the molar ratio of Mn:Ce was 4:1 and the volume ratio of O3:NO was 1:4, the removal rate of NO could reach 63%, which could increase the removal rate by 40% compared with that of NO oxidized by O3alone. BET, XRD, and TEM characterization results showed that when the molar ratio of Mn:Ce was 4:1, the catalyst specific surface area, and pore capacity were the largest. A large amount of MnOx and CeOx were distributed on the catalyst surface. The XPS analysis showed that the oxidation-reduction and oxygen vacancy of Mn (IV)/Mn (III)/Mn (II) and Ce (IV)/Ce (III), had a synergistic effect on the decomposition of O3into reactive oxygen species(O*), thus improving the catalytic capacity of Mn-Ce/Al2O3/TiO2catalyst for O3. The O2-TPD analysis showed that the oxygen vacancies and oxygen species in the catalyst could be used as the active point of decomposition of O3into O*. The experimental results show that the prepared catalyst can significantly improve the efficiency of ozone oxidation of NO and reduce the amount of ozone. The catalyst can be applied to ozone oxidation denitrification technology.
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Journal of Superconductivity and Novel Magnetism
·
2024
·Vol. 37
·期 8
·1475-1485
·
IF 1.6
Fu Shuai,Tan Yiyu,Sun Xiaofan,Tang Zheng,Jiao Shulin,Cai H. L.,Zhang F. M.,Zhang A. M.,Wu X. S.
Here, equal numbers of La and Mn ions are successfully introduced simultaneously in SrRuO3. With increasing La/Mn doping, all compositions crystallize in Pnma with the lattice constant, together with the RuO 6 octahedral distortion, decreases. Ferromagnetism-to-spin glass magnetic behavior is observed at x ≥ 0.23. A metal–insulator transition (MIT) occurs at lower temperatures, resulting from the disordering of the metal mixture in the lattice. The retraction of the RuO 6 octahedron increases the overlap of the Ru t 2g –O 2p orbitals and broadens the Ru 4d bandwidth, leading to weaker electron–electron interactions, which may decrease the electronic and thermal conductivity.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 5
·e70141
·
IF 0
Huan Zhang,Wen-Qi Jin,Peng Li,Wei Gao,Xiu-Mei Zhang
A highly efficient photocatalyst, the CdS/Mn-MOF composite, was synthesized by first preparing a new 2D Mn-MOF (Mn(L)·H 2 O, H 2 L = 5-(2-benzothiazolyl)isophthalic acid) precursor through the solvothermal method and subsequently growing CdS nanoparticles. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV–vis spectroscopy, and other techniques were utilized to characterize the structural, morphological, textural, compositional, and optical properties of the composites. The prepared photocatalysts, designated as X-CdS/Mn-MOF (where X = 50, 25, and 10, represents the mass percentage of CdS), were tested for photocatalytic performance. Among them, the 50-CdS/Mn-MOF sample exhibits the optimized degradation efficiency of 99.1% for Rhodamine B (RhB, 20 mg/L) in 50 min under visible light irradiation, which is 7.3 times and 2.4 times higher than that of Mn-MOF and CdS, respectively. Various test results indicate that the improved photocatalytic activity of CdS/Mn-MOF composites can be attributed to the formation of heterojunctions. Specifically, the heterojunctions enhance the separation efficiency of photogenerated carriers and effectively suppress the recombination of electrons and holes, thereby improving the overall efficiency of the photocatalytic reaction. Moreover, the presence of heterojunctions optimizes the material's band structure, facilitating more efficient carrier transport, which further enhances photodegradation performance. Radical quenching experiments confirmed hydroxyl radicals (·OH − ) and superoxide radical anions (·O 2 − ) played dominant roles in the photodegradation process. Additionally, the composite material also demonstrates good stability and reproducibility. The research further provides evidence that the efficiency of dye degradation can be significantly improved by the rational design of composite catalysts consisting of other semiconductors and MOFs.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yuying Li,Shengxiong Liao,Yiming Gao,Dai Dang,Yuying Zheng,Fashen Chen
Developing highly efficient non-precious metal bifunctional catalysts remains a critical challenge in electrolytic water splitting research. In this study, we prepared Mn-doped CoP coupled with nitrogen-doped carbon nanocube (Mn–CoP/NC) catalysts using an in situ growth, low temperature oxidation, and phosphatization strategy. Due to the excellent activity of the cobalt species and the effective protection provided by the carbon shell to the metal core, these Mn–CoP/NC catalysts exhibited outstanding hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performances. At a current density of 10 mA cm2, the overpotentials were as low as 90 mV for the HER and 272 mV for the OER. Moreover, the Mn–CoP/NC‖Mn–CoP/NC cell achieved a current density of 10 mA cm−2 at just 1.66 V and remained highly stable after 36 hours of continuous operation. This study offers a new strategy for designing efficient bifunctional catalysts for overall water splitting.
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产品关联
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高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Yilin Zhao,Fangwei Liu,Jingbo Hu,Yang Yang,Jianzhou Wu,Shihui Zou,Jie Fan
The Mn–Na2WO4/SiO2 catalyst for oxidative coupling of methane (OCM) is highly appealing and promising but its high light-off temperature (>800 °C) hinders its industrial application. Engineering catalysts for efficient catalytic performance is attractive yet challenging. In this study, we demonstrate that the incorporation of small amounts of silver into the Mn–Na2WO4/SiO2 catalyst significantly improves its performance, achieving a C2 yield of up to 20% at 750 °C. Characterization results indicate that silver facilitates O2 activation and promotes C–H bond activation, thereby further enhancing CH4 conversion. The findings offer valuable insights into advancing the design concept of high-performance OCM catalysts.
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产品关联
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高影响因子
Small
·
2024
·Vol. 20
·期 36
·2401497
·
IF 13
Shiqi Liu,Jie Wan,Boya Wang,Chenghan Li,Yulong Wang,Lin Wang,Haipeng Wu,Nian Zhang,Xu Zhang,Haijun Yu
Manganese-based lithium-rich layered oxides (Mn-LLOs) are promising candidate cathode materials for lithium-ion batteries, however, the severe voltage decay during cycling is the most concern for their practical applications. Herein, an Mn-based composite nanostructure constructed Li 2 MnO 3 (LMO@Li 2 MnO 3 ) is developed via an ultrathin amorphous functional oxide Li x MnO y coating at the grain surface. Due to the thin and universal LMO amorphous surface layer etched from the lithiation process by the high-concentration alkaline solution, the structural and interfacial stability of Li 2 MnO 3 are enhanced apparently, showing the significantly improved voltage maintenance, cycle stability, and energy density. In particular, the LMO@Li 2 MnO 3 cathode exhibits zero voltage decay over 200 cycles. Combining with ex situ spectroscopic and microscopic techniques, the Mn 2+/4+ coexisted behavior of the amorphous LMO is revealed, which enables the stable electrochemistry of Li 2 MnO 3 . This work provides new possible routes for suppressing the voltage decay of Mn-LLOs by modifying with the composite functional unit construction.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Jian Yang,Xi Yuan,Lin Fan,Yuzhu Zheng,Fanshu Ma,Haibo Li,Jialong Zhao,Huilian Liu
Mn doped cesium lead halide perovskite nanocrystals (NCs) have potential application for white light emitting diodes. However, the emission of doped NCs is limited to trap-mediated energy transfer. The Mn doped CsPbCl 3 NCs with corporation of rubidium (Rb + ) ions (Mn:Cs 1-x Rb x PbCl 3 NCs, x = 0, 0.1, 0.2, 0.3, and 0.4) were synthesized. The effect of the optical and structural properties of Mn:Cs 1-x Rb x PbCl 3 NCs were studied by steady-state and time-resolved photoluminescence spectroscopy. The photoluminescence quantum yields and lifetimes of Mn doped CsPbCl 3 NCs with different Rb + contents were obtained. It was found that the Mn doped CsPbCl 3 NCs with Rb + content of 0.1 exhibited the highest Mn 2+ emission quantum yield up to 63.18%. Interestingly, the temperature-dependent PL spectra demonstrated the enhanced Mn 2+ emission of Mn doped CsPbCl 3 NCs at low temperature of 80 K. The experimental result indicated the Mn 2+ emission of Mn doped CsPbCl 3 NCs was enhanced by incorporating Rb + ions.
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