Light-Science & Applications
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2025
·Vol. 14
·期 1
·1-10
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IF 23.4
Yu Mubing,Qin Tingxiao,Gao Gang,Zu Kelei,Zhang Dongming,Chen Nan,Wang Dengke,Hua Yong,Zhang Hong,Zhao Yong-Biao,Zhu Jiaqi
Deep-blue perovskite light-emitting diodes (PeLEDs) based on reduced-dimensional perovskites (RDPs) still face a few challenges including severe trap-assisted nonradiative recombination, sluggish exciton transfer, and undesirable bathochromic shift of the electroluminescence spectra, impeding the realization of high-performance PeLEDs. Herein, an in situ chlorination (isCl) post-treatment strategy was employed to regulate phase reconstruction and renovate multiple defects of RDPs, leading to superior carrier cooling of 0.88 ps, extraordinary exciton binding energy of 122.53 meV, and higher photoluminescence quantum yield of 60.9% for RDP films with deep-blue emission at 450 nm. The phase regulation is accomplished via fluorine-derived hydrogen bonds that suppress the formation of small- n phases. Multiple defects, including halide vacancies (shallow-state defects) and lead-chloride antisite defects (deep-state defects), are renovated via C=O coordination and hydroxy-group-derived hydrogen bonds. Consequently, deep-blue PeLEDs with a record maximum external quantum efficiency of 6.17% and stable electroluminescence at 454 nm were demonstrated, representing the best-performing deep-blue PeLEDs.
研究领域:
材料科学
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光学工程
·
半导体物理
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产品关联
DOI
PubMed
高影响因子
Journal of Materiomics
·
2025
·
IF 9.6
Jia Wang,Yuanbo Zhang,Zijian Su,Tao Jiang
Silicon (Si) has been proven to significantly enhance CO 2 reduction efficiency of numerous catalysts. However, the lack of research on Si's effect on manganese ferrite catalytic performance presents a challenge in using high-silica manganese ore to prepare cost-effective, efficient manganese-based ferrite decarbonization catalysts. This work prepared Nano-MnFe 2 O 4 materials containing 0.0%–9.3%Si (2.3% increments, in mass fraction) by solid-phase synthesis (1300 °C, air) and nano-grinding. The effect, mechanism, and enhancement strategy of Si on the low-temperature catalytic reduction of CO 2 to carbon (C) performance of Nano-MnFe 2 O 4 were systematically investigated. Results showed that introducing Si transformed Nano-MnFe 2 O 4 into Nano-Mn X Fe 3– X O 4 (0.75 < X < 1.00) with degraded catalysis and Nano-Fe Y Mn Z SiO 4 with almost no activity, lowering CO 2 reduction to C from 5.55 mmol/g to 2.81 mmol/g. Increasing Si concentration simultaneously decreased the content and X -value of Nano-Mn X Fe 3- X O 4 , causing fewer oxygen vacancies and declined CO 2 reduction. A phase reconstruction strategy to eliminate Si impact and enhance catalysis was proposed, i.e. , adding MgO, increasing Mn/Fe ratio, and nano-grinding followed by magnetic separation. Nano-Mg 0.19 Mn 1.70 Fe 1.11 O 4 reconstructed from Nano-MnFe 2 O 4 with 2.3% Si exhibited 8.82 mmol/g CO 2 reduction and 100% carbon conversion at 350 °C. Mg 2+ doping strengthened the conversion of Mn 2+ to highly catalytically active Mn 3+ and Mn 4+ ions, increasing oxygen vacancies and electron transport for C=O rupture.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Yusufujiang Mubula,Mingming Yu,Hongju Gu,Lei Wang,Man Chen,Tingsheng Qiu,Guangjun Mei
Rare earth molten salt electrolytic slag (RMES) has emerged as a promising secondary resource for rare earth elements (REEs). This study introduces an innovative leaching technique for extracting REEs from RMES under atmospheric conditions, employing an alkali phase reconstruction method followed by an acid leaching process. Additionally, the external electric field was employed to enhance the reaction. Under the optimal reaction conditions: NaOH initial concentration of 70 wt%, NaOH-slag mass ratio of 4:1, temperature of 160 °C, current density of 1000 A/m 2 , reaction time of 90 min, stirring speed of 300 r/min, HCl concentration of 4 mol/L, liquid-solid ratio of 15:1, and leaching time of 20 min, the leaching efficiencies of Nd and Pr reach up to 99.21% and 99.14%, respectively. Phase analysis indicates that the rare earth fluorides transform into rare earth hydroxides, significantly enhancing their solubility in acid solution. The imposition of an external electric field leads to pronounced disruption of the RMES surface, thereby promoting the formation of stable reactive oxygen species in the alkaline medium. This facilitates the decomposition of fluorinated rare earths and hastens the phase reconstruction, resulting in an enhanced leaching process. The achieved leaching efficiency with an external electric field is 37% higher than that without an electric field.
研究领域:
冶金工程
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材料科学
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化学工程
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Yuanjun Liu,Binbin Li,Yuyu Liu,Yiru Wu,Xingmei Guo,Junhao Zhang,Jun Zhu,Guoxing Zhu
Pre-catalysts that will evolve into catalytic active species during the catalytic process have got researchers’ much attention for oxygen evolution. The thus derived active species often show higher activity than those counterparts obtained by direct synthesis method. However, the complex reconstruction behavior usually restricts the understanding of catalytic process and limits their practical applications. In this study, an iron-based polyoxomolybdate (Fe-POMo) material obtained with the reaction between Fe 3+ and [Mo 7 O 24 ] 6− was shown. The obtained Fe-POMo product presents porous and amorphous structure, which facilitates the diffusion-leaching of [Mo 7 O 24 ] 6− anions, and so the phase reconstruction in alkaline solution during oxygen evolution process. The resulted low-crystalline (oxy)hydroxides with amounts of vacancies are loaded on electrode surface through a dissolution-redeposition process, which act as the active substrates for catalysis. The optimized catalytic electrode from Fe-POMo precursor presents excellent catalytic activity and high stability for at least 48 h. This study shows a new route for the derivation of pre-catalysts with the formation of high active (oxy)hydroxides.
研究领域:
材料科学
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电化学
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催化科学
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产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Taiping Tian,Tao Wang,Xueer Ning,Pengxu Ren,Qian Liu,Dongling Wu
The utilization of coal combustion supports the long-term stable development of the socio-economy, but slagging and ash deposition phenomena constrain its efficient utilization. This study employed a co-precipitation method to prepare a layered PO 4 3− -intercalated magnesium–aluminum hydrotalcite (MAP) additive to improve coal ash fusion characteristics. Combustion experiments demonstrated that the MAP additive significantly increased the ash fusion temperature of Naomaohu coal (NC) (the softening temperature rose from 1161 °C to 1393 °C) while reducing fine particulate matter generation. The mechanisms include: (1) solid-phase reconstruction: promoting the phase transformation of low-melting-point alkaline minerals (e.g., anorthite, nepheline, anhydrite) into high-melting-point crystals (e.g., akermanite, forsterite, magnesium calcium phosphate); (2) ion immobilization: layered phosphates capturing alkali metal ions (Na + , K + ) through ion exchange. The dual mechanisms synergistically altered ash particle distribution: the peak particle size of fine particles (PM 1 ) shifted from 0.03 μm to 1.05 μm, the proportion of coarse particles (PM 2.5 ) increased by 48 %, and the peak distribution expanded from 2.46 μm to 3.64 μm. Concurrently, the surface adhesion of ash was reduced, enhancing dispersion efficiency and effectively inhibiting slagging and ash deposition. The MAP additive exhibits excellent potential for regulating ash fusion behaviour, providing a novel strategy for the clean and efficient utilization of coal.
研究领域:
燃料化学
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燃烧工程
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无机材料化学
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能源利用
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煤清洁利用
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产品关联
DOI
高影响因子
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