FUEL
·
2025
·
IF 7.5
Lina Dai,Qiang Li,Xianglan Dong,Enqi Zhang,Yufeng Hu,Xin Guo,Yanduo Liu
Photocatalysis exhibits great potential for applications in solving energy and environmental problems, and has received widespread attention. This article constructs a new type of Mn-Fe Prussian blue analogues S-scheme mechanism photocatalytic material. The material is composed of oxidized photocatalysts (Ag 2 MoO 4 ) and reduced photocatalysts (Mn-Fe PBAs). The composite photocatalyst constructed in this way shows advantages such as a wide spectral response range, high charge carrier separation efficiency, and strong oxidation–reduction ability, which can significantly enhance photocatalytic efficiency. By studying the construction method and CO 2 reduction performance of the photocatalyst, the structure-performance relationship can be clarified. The CO production rate is 43.3 μmol/g/h, and the selectivity can reach 94.9 %, which is far superior to the current mainstream photocatalytic system. The electron transfer kinetics and S-scheme charge separation mechanism between the Mn-Fe PBAs and Ag 2 MoO 4 interfaces are explained by steady-state surface photovoltage spectroscopy (SS-SPS) and near ambient pressure XPS (NAP-XPS). In-situ DRIFTS techniques are used to monitor the changes of transition intermediates, and combined with theoretical calculations, the activation mechanism of CO 2 by the Mn-Fe catalytic site is deeply revealed at the atomic level. This study provides new theoretical guidance and profound insights for the construction of Prussian blue analogues photocatalysts.
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Lingfeng Li,Muqing Chen,Yayin Liu,Jinhong Chen,Xueyi Chang,Zhiyu Cheng,Lirong Cai,Yongfu Qiu,Yu Wang
Zero-dimensional (0D) lead-free Cs 2 ZrCl 6 nanocrystals (NCs) have gained increasing attention in the photoluminescence (PL) and scintillation fields owing to their remarkable advantages such as low cost, high chemical yield, and environmental friendliness. Nevertheless, the current Cs 2 ZrCl 6 NCs are plagued by low photoluminescence quantum yield (PLQY) and low light yield (LY) due to inherent defects (like chlorine vacancies), which commonly serve as traps and cause non-radiative recombination of excitons. Herein, Cs 2 ZrCl 6 NCs with non-radiative defects eliminated, which have a near-unity (98.6 %) PLQY and an ultra-high LY (79,000 photons MeV −1 ), were prepared via Mn doping. The experimental characterizations, including X-ray photoelectron spectroscopy (XPS), Raman, steady-state and time-resolved photoluminescence spectroscopy, confirmed the elimination of non-radiative chlorine vacancies in Mn-doped Cs 2 ZrCl 6 . Density functional theory calculations disclosed that the existence of chloride vacancies in Cs 2 ZrCl 6 could introduce deep defect levels within the bandgap, resulting in non-radiative recombination. However, Mn doping could eliminate these trap states. Consequently, the fabricated Mn-doped Cs 2 ZrCl 6 scintillator film achieved excellent performance for bendable X-ray detection and imaging, featuring an ultra-low detection limit (35.6 nGy air s −1 ) and an ultra-high spatial resolution (20 lp mm −1 ). The work suggests that doping can provide an alternative solution for developing defect-free perovskites with perfect properties.
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产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2025
·
IF 11
Ya-Ke Wu,Kai Jia,Fu-Ying Wu,Bei-Bei Xiao,Ting Bian,Hu Liu,Hong Li,Liu-Ting Zhang
en Weakening the electrostatic attraction between Mg 2+ ions and H − ions in MgH 2 is vital for improving the kinetic performance of MgH 2 for hydrogen storage. Herein, a multivalent microenvironment is synergistically created by Mn and Mg 2 Ni to break the stable structure of MgH 2 , enabling rapid and stable de/hydrogenation performance. Specifically, the catalyzed MgH 2 system rapidly emits 5.98 wt% H 2 at 265°C within just 20 min and swiftly absorbs 6.24 wt% H 2 at 150°C in a mere 10 min. Microscopic characterization shows that a tight interface is formed between Ni and Mn 2 O 3 , which provides a stable anchor point for the formation of hydrogen pumps. Additionally, the multivalency of Mn and abundant oxygen vacancies accelerate the electron transfer and provide the shortest path for H dissociation. Moreover, density functional theory (DFT) indicates that Mg-H is extracted from 0.173 to 0.204 nm after modification, achieving a reduced decomposition energy of MgH 2 . Besides, 97.8% reversible hydrogen storage capacity was maintained after 30 cycles, presenting prominent potential for practical applications. 摘要 zh 削弱MgH 2 中Mg 2+ 离子与H − 离子之间的静电吸引力对于提升MgH 2 作为氢储存材料的动力学性能至关重要。在此,通过Mn与Mg 2 Ni的协同作用,构建了多价微环境,打破了MgH 2 的稳定结构,从而实现了快速且稳定的脱氢和加氢性能。具体而言,催化后的MgH 2 体系在265°C下仅需20分钟即可快速释放5.98 wt%的H 2 ,并在150°C下仅需10分钟即可迅速吸收6.24 wt%的H 2 。微观表征显示,Ni与Mn 2 O 3 之间形成紧密界面,为氢泵的形成提供了稳定的锚定点。并且,锰的多价性和丰富的氧空位加速了电子转移,并为氢的解离提供了最短路径。此外,DFT表明,经过改性后,Mg-H键键长从0.173 nm增加至0.204 nm,从而降低了MgH 2 的结合能。此外,经过30个循环后,可逆氢储存容量仍保持在97.8%,展现出显著的实际应用潜力。
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2015
·Vol. 53
·期 11
·1305-1309
·
IF 3.113
Yuanyuan Xu,Jinming Sun,Hou Chen,Liangjiu Bai,Qian Tao,Lili Yu,Yating Wang
2-Cyanoprop-2-yl dithionaphthalenoate (CPDN) was successfully used as the chain transfer agent to prepare polyacrylonitrile in combination with manganese(III) acetylacetonate (Mn(acac) 3 ) as the initiator. The novel polymerization exhibited well “living”/controlled characteristics. The polymerization behavior was revealed to comply with features of reversible addition–fragmentation chain transfer polymerization process. Mn(acac) 3 played a key role as the initiator rather than the radical trapping agent in polymerization and exhibited better control performance than azo-initiator. The narrowest molecular weight distribution was 1.31 under the condition of [AN] 0 :[Mn(acac) 3 ] 0 :[CPDN] 0 = 200:1:0.025 and AN:DMF = 1:1 (V/V). Various feed ratios of Mn(acac) 3 and CPDN were also investigated in detail. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53 , 1305–1309
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xueqian Ji,Yuxing Xu,Qing Xia,Yuncheng Zhou,Jiechen Song,Hailan Feng,Pengfei Wang,Jun Yang,Qiangqiang Tan
With the increasing demand for high energy density and rapid charging performance, Li-rich materials have been the up and coming cathodes for next-generation lithium-ion batteries. However, because of oxygen evolution and structural instability, the commercialization of Li-rich materials is extremely retarded by their poor electrochemical performances. In this work, Li-deficient materials Li0.3NbO2 and (Nb0.62Li0.15)TiO3 are applied to functionalize the surface of Li1.2Mn0.54Ni0.13Co0.13O2, aiming to suppress oxygen evolution and increase structural stability in LIBs. In addition, a fast Li-ion transport channel is beneficial to enhance Li+ diffusion kinetics. The results demonstrate that the electrodes decorated with Li0.3NbO2 and (Nb0.62Li0.15)TiO3 materials exhibit more stable cycling stability after long-term cycling and outstanding rate capability.
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DOI
高影响因子
Materials Research Express
·
2017
·Vol. 4
·期 8
·085028
·
IF 1.068
Guangguang Huang,Chunlei Wang,Shuhong Xu,Yiping Cui
For ultrasmall Mn-doped quantum dots (QDs), the energy transfer of the exciton to the Mn is the key factor for Mn emission. Herein, the Ag-induced electron trap state energy level, which is an intermediate energy level between the conduction band (CB) and 4T1 of Mn, is proposed for improving the energy transfer. After doping the Ag and forming Ag&Mn:ZnInS QDs, most excitons will first be captured by the intermediate energy level and then be transferred to Mn d-states, leading to enhanced photoluminescence (PL) quantum yields (QY) of the QDs from the original 17% (Mn:ZnInS QDs) to 30% (Ag&Mn:ZnInS QDs).
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DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 23
·3568-3575
·
IF 3.382
Kun Bai,Rihui Tan,Bao Ke,Xiaogang Xue,Jialong Zhao,Bingsuo Zou,Ruosheng Zeng
In recent years, halide perovskites have attracted great attention as a type of well-known material, especially inorganic perovskites like CsPbX3 (X = Cl, Br, and I). Herein, we introduce a new family of doped nanocrystals offering unique insights into the synthetic chemistry of doped perovskites. Mn-Doped Cs3Pb6.48Cl16 nanocrystals with pure dopant emission were prepared at room temperature with a low Mn/Pb feed ratio (>1.4). The band edge luminescence of Mn:Cs3Pb6.48Cl16 was almost completely inhibited, and the photoluminescence quantum yields (PL QYs) of Mn ions could reach up to 25%. Furthermore, the temperature-dependent PL spectra and temperature-dependent lifetime of the new family of doped nanocrystals indicated that the inflection point affects both the PL intensity and the PL lifetime of Mn2+ ions with increasing the temperature, which is related to the Mn/Pb ratio.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Linna Dai,Xin Zhou,Yuan Yang,Pei Hu,Lijie Ci
Nonaqueous Li − O 2 battery (LOB) is considered one of the most promising energy storage system due to its ultrahigh theoretical specific capacity (3500 Wh kg −1 ). Introducing vacancies in CoMn 2 O 4 catalysts is regarded as an effective strategy to enhance the electrochemical performances of LOB. However, the relation between vacancy types in CoMn 2 O 4 and catalytic performances in the LOB remains ambiguous. Herein, ordered porous CoMn 2 O 4 with oxygen and metal vacancies is obtained via solvothermal reaction followed by temperature-controlled calcination using polystyrene spheres as templates. The increase in treatment temperature reduces the content of oxygen vacancies while increasing that of the metal vacancies. Notably, experimental results and theoretical calculations show that oxygen vacancies in CoMn 2 O 4 have a greater influence than metal vacancies in modulating the LiO 2 adsorption during the reaction processes and reducing the overpotential. CoMn 2 O 4 synthesized at 500 ℃ (CoMnO-500) with higher oxygen vacancies exhibits stronger adsorption onto the LiO 2 , facilitating the formation of film-like Li 2 O 2 . Therefore, an LOB with the CoMnO-500 catalyst presents the lowest overpotential of 1.2 V and longest cycle lifespan of 286 cycles at a current density of 200 mA g −1 . This study offers insights into the effect of CoMn 2 O 4 vacancies on the formation pathway of Li 2 O 2 discharge products.
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Fuping Song,Juping Zhang,Dongfang Li,Tao Zhu,Xing Zhu,Hua Wang
Oxidative dehydrogenation (ODH) of ethylbenzene is a promising process for styrene production. However, its application is limited by product overoxidation and purification requirements due to the co-feeding of mild oxidants. Herein, we report a facile manganese-based catalyst (K/Mn 3 O 4 -Al 2 O 3 ) and achieve competitive styrene selectivity of 88 % and ethylbenzene conversion of 95 % at 450 ℃ (84 % yield vs. ∼ 60 % yield in commercial dehydrogenation process at 600 ℃) under a cyclic redox ODH scheme. The introduction of Al 2 O 3 into MnO x restructures composite oxides and depresses bulk lattice-oxygen migration for the partial oxidation of ethylbenzene. The surface modification using potassium creates reactive sites and regulates surface properties, achieving ethylbenzene activation and high conversions. Highly active lattice oxygen in catalysts after bulk and surface modifications selectively converts ethylbenzene to styrene and water. This study provides an understanding of roles of manganese-based catalysts in styrene generation and offers a strategy to modulate lattice oxygen on catalysts.
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DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Worku Lakew Kebede,Kuo Dong-Hau,Chen Xiaoyun
Metal oxide semiconductor photocatalysts have received remarkable consideration as a promising technology for environmental remediation and energy conversion. Oxysulfide semiconductors have narrow band gaps which are appropriate for photocatalytic removal of toxic organic pollutants under visible light illumination. For the elimination purpose of these pollutants, Mo(O,S) 2 , Mn(O,S) 2 , and Mn–Mo(O,S) 2 oxysulfide catalysts containing various Mn contents were synthesized at low temperatures via a simple method. The structural, morphological, electrochemical, compositional, and optical properties of the as-synthesized catalysts were exhaustively characterized. The photocatalytic degradation activity of the bares Mo(O,S) 2 , Mn(O,S) 2 , and other Mn–Mo(O,S) 2 compositions were evaluated over different types of organic pollutants under visible light illumination. The addition of Mn in Mo(O,S) 2 structure improved the photodegradation activity, and Mn–Mo(O,S) 2 -30 was found to be the best composition with superior photodegradation performance towards the four cationic, anionic, and neutral dyes. The degradation efficiency of 10 ppm of MB, and MO dyes reach 99.7 % and 98.6 %, within 30 and 120 min, respectively. Mn–Mo(O,S) 2 -30 catalyst also shows a good photodegradation performance on Rh B and NR organic pollutants. According to the recycling test, the catalyst exhibited excellent performance. The photodegradation follows pseudo-first order kinetics with a rate constant of 0.097 and 0.036 min −1 for MB and MO dyes, respectively. The trapping experiment showed that superoxide anion radicals (O 2 •- ) and holes (h + ) are the responsible active species for the degradation on MO and MB, respectively. The novelty of using Mn–Mo(O,S) 2 -30 for various dyes degradation lies in its remarkable catalytic properties.
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DOI
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Yi Yang,Jia Fang,Zhongwei Meng,Ping Pu,Qian Zhang,Chengcheng Yi,Suozhu Pan,Yalong Li
To solve the soot elimination and optimize catalyst diesel particulate filter (CDPF) regeneration strategies, a series of Mn-Ce catalysts with different Mn/(Mn+Ce) molar ratios are successfully synthetized by hydrothermal method and the complete catalytic oxidation of diesel engine soot are investigated. Compare to CeO 2 and MnO 2 , the catalytic promotion on soot combustion of Mn-Ce catalysts is more excellent by thermogravimetric experiments due to their better ability to activate oxygen species, which is consistent with results in characterization analysis. Among as-prepared catalysts, MC-0.40 has the best catalytic activity with the lowest starting temperature ( T s ), peak temperature ( T p ) and largest comprehensive combustion index ( S ) both in O 2 /N 2 and NO/O 2 /N 2 atmosphere. Influence factors on catalytic performance are studied. Weight ratios of soot/MC-0.40 catalyst are suitable at the range of 1:9–1:13, which makes soot combustion more easily. Ashes in the reaction process show adverse effects due to their ability to increase ignition point by inhibit heat and oxygen transfer. Mn-Ce catalysts are more sensitive and show better catalytic activity in NO atmosphere because of generations of abundant adsorbed species and NO adsorption/desorption. The three consecutive cycles of MC-0.40 catalyst are performed to study the catalytic stability, and thermogravimetric curves show that the potential reusability of MC-0.40 catalyst can be relatively accepted in soot combustion.
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DOI
高影响因子
WATER RESEARCH
·
2020
·
IF 9.13
Ruya Chen,Yuan Zhuang,Ying Yu,Baoyou Shi
Particulate manganese oxide (MnOx) deposition in drinking water distribution systems (DWDS) gives rise to the risk of water discoloration at the consumers’ tap; however, its role in the fate and transport of trace organic pollutants in DWDS is not clear. Perfluorooctanoic acid (PFOA), a persistent organic pollutant frequently detected in natural water, was selected to investigate the potential effect of MnOx on its transportation behavior under DWDS conditions through laboratory batch experiments. The results show that PFOA can be greatly combined with MnOx formed in-situ through a Mn(II) oxidation process by free chlorine. However, the accumulation of PFOA by preformed MnOx was negligible. It was found that 1 mg/L Mn captured over 50% of PFOA with an initial concentration of 50 ng/L during oxidation. The water compositions of actual water could contribute to the effect of PFOA accumulation to a certain extent. Characterization of the solid products revealed that PFOA is homogenously embedded into MnOx. The combination of PFOA with MnOx occurs through a bridging effect of Mn(II) between the surface hydroxyls of MnOx and the -COOH group of PFOA. The resulting MnOx-PFOA particles were more inclined to agglomerate, enabling possibly easy deposition onto the pipe wall than ordinary MnOx particles. This study provides insights into the co-occurrence of metal deposits with PFOA and the potential risks posed by PFOA accumulation to consumers through the water distribution process.
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DOI
高影响因子
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