JOURNAL OF POWER SOURCES
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2025
·
IF 7.9
Chunyan Zhang,Jiaxing Luo,Shaojun Sun,Kailing Yuan,Mingxin Ran,Chuanhua Li,Xuemin Yan
The most crucial part of electrolyzing water lies in the design and preparation of the catalyst. Manganese-doped metal phosphides are often studied as catalysts for water electrolysis due to their outstanding dual-function properties. In this paper, a two-step method of in-situ hydrolysis and low-temperature phosphating is provided to prepare manganese-doped tri-metallic nickel-cobalt-based phosphides ((Mn)CoP 2 /NiCoPs) ultrafine nanoparticles. It is found that the addition of manganese led to a reduction in the unit cell size of NiCoP and CoP 2 in the catalyst. As the amount of manganese element in the raw materials increases, the doping amount of manganese in the catalyst shows an upward trend. In 1 M KOH, (Mn)CoP 2 /NiCoP-2 with the manganese doping content of 0.35 wt% shows the overpotentials of 52 mV for hydrogen evolution reaction (HER) and 141 mV for oxygen evolution reaction (OER) to achieve 10 mA cm −2 . For total hydrolysis reaction, it requires an overpotential of only 1.50 V in 1 M KOH and 1.48 V in simulated seawater environment. Compared with pure Co 2 P/NiCoP, the catalytic activity of (Mn)CoP 2 /NiCoP-2 is higher. This can be attributed to the doping of manganese, which reduces the oxygen content and particle size of the catalyst, and also optimizes its electronic structure.
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高影响因子
Light-Science & Applications
·
2026
·Vol. 15
·期 1
·90
·
IF 23.4
Zhou Guojun,Wang Pei,Ren Qiqiong,Zhang Nan,Lv Jin,Mao Yilin,Qiao Jianwei,Zhang Xian-Ming
Magneto-optical coupling provides a powerful alternative to crystal field engineering for modulating Mn 2+ luminescence. However, precise control over Mn–Mn coupling is hindered by the complex spin-electron super-exchange interactions. Herein, we report a symmetry-broken Mn(II) chloride dimer, (C 10 H 20 O 5 Mn)(CH 3 CN)MnCl 4 , synthesized through a crown-ether-assisted supramolecular strategy. The dimer features a 7-coordinated pentagonal bipyramid and a 4-coordinated tetrahedron linked by a distorted Mn–Cl–Mn bridge (129°), which promotes rare spin-canted Mn–Mn coupling and creates a novel Mn–Mn luminescent center. This center exhibits a red emission at 638 nm with an unusually short lifetime of 0.42 ms, which is attributed to the relaxation of spin-forbidden d – d transitions. Notably, the emission undergoes a 30 nm blue-shift upon heating (5–305 K) due to the thermal suppression of spin-canting, and a 40 nm blue-shift under applied pressure (0–20 MPa) resulting from reduced orbital overlap. This dual-responsive luminescence originates from spin-canted weak ferromagnetism, which induces a rearrangement of energy-levels by separating antibonding orbitals. Using this effect, we have demonstrated an optical manometer for real-time underwater depth sensing. These findings highlight spin-canted Mn(II) dimers as a promising platform for stimuli-responsive luminescence and reveal a new mechanism for d–d transition modulation.
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PubMed
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Zhicheng Liao,Huan He,Danni Cui,Jingye Cui,Xiaoxia Yang,Ziwei Guo,Hao Chen,Guohua Dao,Bin Huang,Hongwen Sun,Xuejun Pan
Algal extracellular organic matter (EOM), a major fraction of the dissolved organic matter found in eutrophic plateau lakes, can act as a photosensitizer to drive the abiotic oxidation of Mn(II). This process has the potential to generate reactive Mn(III) and influence the fate of organic pollutants. In this study, the photodegradation of 17α-ethinylestradiol (EE2) in the presence of Mn(II) and EOM was investigated with emphasis on the photogeneration mechanism of Mn(III). The results indicated that Mn(II) can accelerate EE2 photodegradation in EOM solution owing to the photogeneration of reactive Mn(III), and the enhancement was greater at higher Mn(II) concentrations. The generation of reactive Mn(III) was mainly attributable to the action of superoxide radical generated by photosensitization of EOM. In addition, the photodegradation of EE2 was slower at higher pH, possibly because of the deactivation of Mn(III) under alkaline conditions. Single-electron transfer was an indispensable process in the photodegradation. The differences in fluorophore content, pH, and NO 3 − concentrations are all important determinants for EE2 photodegradation in natural waters. The information obtained in this research would contribute to the understanding of reactions between Mn(II) and EOM, and provide new insights into the behaviors of reactive Mn(III) in eutrophic water irradiated by sunlight.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Shule Duan,Huiyu Dong,Pin Hou,Gangsheng Han,Bochao Zhang,Zhimin Qiang
Permanganate (Mn(VII)) is a widely used oxidant in water treatment , which can oxidize trace organic contaminants (TrOCs) and Mn(II). Interestingly, this study found that presence of Mn(II) could accelerate the abatement of bisphenol A by Mn(VII) only under oxic condition . Herein, the effects of Mn(II) and dissolved oxygen (DO) on the abatement of TrOCs by Mn(VII) oxidation and the related mechanism were investigated. Results indicate that DO was involved in the Mn(VII)/Mn(II) reaction, with the reaction stoichiometry of Δ[Mn(VII)]:Δ[Mn(II)] determined to be 1:2 and 1:1.5 in the presence and absence of DO, respectively. Quenching and electron paramagnetic resonance tests verified that both superoxide radicals (O 2 •− ) and reactive Mn species contributed to the accelerated abatement of TrOCs (bisphenol A, methyl phenyl sulfoxide, and methyl phenyl sulfone) in the Mn(VII)/Mn(II) process. Specifically, O 2 •− was produced through the one-electron reduction of DO and made an important contribution (32.4%–100%) to the abatement of selected TrOCs. This study reveals that Mn(II) could enhance TrOC abatement by Mn(VII) oxidation, and DO played a pivotal role in the Mn(VII)/Mn(II) process.
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yiqing Liu,Ting Wang,Zhengjie Chen,Shenglan Liu,Yongsheng Fu
Currently, the research on bisulfite (BS) activation by Mn(II) is very limited probably because of the low catalytic efficiency of Mn(II). Adding ligands to Mn(II)/BS system is likely to improve the BS activation, but the relative information is very rare. Therefore, the effect of nitrilotriacetic acid (NTA) on Mn(II)/BS system was investigated in this work using sulfamethoxazole (SMX) as the target contaminant. The results showed that the addition of NTA enhanced SMX removal in Mn(Ⅱ)/BS system through forming Mn(Ⅱ/III)-NTA complexes driving Mn(III)/Mn(II) cycle and stabilizing Mn(III). Alcohol scavenging experiments and competitive kinetic experiments indicated that sulfate radical (SO 4 •− ) and hydroxyl radical (HO • ) were not the main reactive species in Mn(II)/NTA/BS system. Mn(Ⅲ) was the primary oxidant for SMX elimination in this system and its existence was proved by UV-Vis absorption spectrum of reaction solution. Mn(Ⅱ)/NTA/BS system could greatly degrade SMX in near-neutral conditions, while nearly no SMX removal was observed at pH 3.0. The decrease of dissolved oxygen concentration significantly inhibited BS autocatalytic stage, thus suppressing the removal of SMX. Due to the competitive complexation of HCO 3 − and FA with NTA for Mn(II), their addition in Mn(Ⅱ)/NTA/BS system obviously inhibited SMX degradation . Four intermediates were detected during SMX degradation in Mn(Ⅱ)/NTA/BS system, and the possible SMX transformation pathways were speculated as N-S bond breaking, hydroxylation, amino oxidation and coupling reaction.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Hongzheng Wu,Ruosheng Zeng,Zifang Tang,Yunlong Bai,Shuai Zhang,Yarui Dai
Organic-inorganic hybrid metal halides hold considerable potential for diverse applications, including light-emitting diodes, display diodes, liquid crystal displays , and photodetectors , owing to their exceptional optical properties . Herein, we successfully synthesized lead-free zero-dimensional (0D) (C 13 H 22 N) 2 MnCl 4 metal halide single crystals with green emission, employing an anti-solvent method. The (C 13 H 22 N) 2 MnCl 4 single crystals, featuring four-coordinated Mn 2+ , exhibit pronounced green emission at 528 nm and demonstrate a photoluminescence quantum yield (PLQY) of approximately 72 %. This emission is attributed to the 4 T 1 (G)- 6 A 1 (S) transition and the considerable Mn–Mn spacing distance between adjacent [MnCl 4 ] 2- tetrahedra. The photoluminescence spectra during thermal cycling underscore the exceptional optical stability of the (C 13 H 22 N) 2 MnCl 4 material. These organic-inorganic hybrid manganese halides emerge as a compelling and novel candidate for future light-emitting diode materials.
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高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 34
·2401591
·
IF 8
Cheng Luo,Juntao Li,Ruiling Zhang,Peigeng Han,Jianyong Liu,Bin Yang
Strong Mn─Mn coupling interactions, including dipolar and exchange interactions, significantly affect the photoluminescence quantum yields (PLQYs) in Mn 2+ -based luminescent materials. However, clarifying the individual effects of dipole–dipole and exchange interactions on photoluminescence (PL) is challenging because these interactions may have similar effects on PL properties, and there is a lack of materials with precisely tunable Mn─Mn distances over a wide range. In this study, the influence of dipolar and exchange coupling on PLQY is quantitatively decoupled by designing a series of hybrid manganese chlorides single crystals with a wide tuning range of Mn─Mn distances, from 6.0 to 9.5 Å. It is found that the PLQY can be enhanced from 2.1% to 57.1%, and the PL lifetime increased from 0.21 to 3.81 ms as the Mn─Mn distance increased. This enhancement is solely attributed to the decreased energy transfer dominated by dipole–dipole interactions. At the shortest Mn─Mn distance of 6 Å, exchange coupling becomes dominant, resulting in an additional red-side PL band with negligible effects on PLQY and lifetime. This work provides valuable insights into the mechanisms underlying the regulation of PLQY in Mn 2 ⁺-based luminescent materials.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Boxiong Zhang,Wenxiong Dong,Yaowu Wang,Xiaomeng Cao,Jianping Peng,Yuezhong Di,Buju Guo,Zhongyu An,Jiaoyang Xia
Alkaline zinc–manganese batteries are the most used disposable batteries in the world and cannot be recharged. Spent alkaline zinc–manganese batteries are mainly disposed of in landfills, and the resulting enrichment of the soil with potassium(K), zinc(Zn), and manganese(Mn) pollutes the groundwater and wastes valuable resources. Herein, a process for the treatment of used alkaline zinc(Zn)–manganese(Mn) batteries that involved water leaching, calcination, and vacuum aluminothermic reduction was developed. Investigation of the elemental migration process and reaction mechanism showed that the purity of potassium carbonate(K 2 CO 3 ) reached 99 % with 92.1 % recovery at a water leaching temperature of 60 °C and time of 25 min. The leaching slag was calcined at 700 °C for 1 h to obtain calcined slag with zinc oxide (ZnO), manganese(III) oxide (Mn 2 O 3 ), and manganese(II) oxide (MnO) as the main phases. When the calcined slag was reduced with aluminum powder, the recovery rate of Zn reached 99.7 % at a reduction temperature of 1100 °C, reduction time of 2 h, and ratio of aluminum powder to calcined slag of 1.5:1. Under these conditions, Mn was recovered in the form of Al 6 Mn alloy, and the main phase of the remaining reduced slag was alumina. In this study, potassium and metallic zinc were separated and recovered, and at the same time, an aluminum(Al)–manganese(Mn) alloy was prepared. The developed environmentally friendly and emission-free process enables the efficient recycling of the valuable resources K, Zn, and Mn, resulting in cleaner battery disposal.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 7
·6832-6837
·
IF 2.195
Li Chunzhe
A series of Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ and Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ /Mn 2+ phosphors were fabricated by a solid state reaction. The phase composition and luminescent properties of the fabricated phosphors were investigated. The XRD patterns show that Eu 2+ and Mn 2+ were doped into the Ca 3 La 6 (SiO 4 ) 6 host in the present experiment. The Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ phosphors show the emission band in blue region and the Ca 3 La 6 (SiO 4 ) 6 :Mn 2+ phosphors exhibit the emission band in yellow region. The excitation band of Ca 3 La 6 (SiO 4 ) 6 :Mn 2+ overlaps with the emission band of Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ that means a possibility for the energy transfer process from Eu 2+ to Mn 2+ in the Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ /Mn 2+ phosphors. Tunable luminescence was obtained due to this energy transfer process and warm white light was emitted by Ca 3 La 6 (SiO 4 ) 6 :0.05Eu 2+ /0.04Mn 2+ and Ca 3 La 6 (SiO 4 ) 6 :0.05Eu 2+ /0.05Mn 2+ phosphors.
研究领域:
材料科学
·
无机化学
·
固体物理
·
发光材料
·
光学材料
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Lanxin Zhang,Mingzhu Li,Qiang Li,Fengbo Wu,Xue Han,Pengfei Wang,Zhanlan Li,Huihui Song,He Huang,Yucai Qin
Green two-step alkaline hydrolysis–calcination yields hollow MnO x spheres from Mn-BTC. • H 3 BTC is efficiently recovered and reused, yielding high atom economy. • MBN 1.0 –500 hosts a MnO 2 /Mn 5 O 8 biphasic heterostructure with O vacancies. • MBN 1.0 –500 achieves low-temperature toluene oxidation: T 90 = 196 °C and E a = 29.4 kJ mol −1 . • DFT and in situ DRIFTS show the interface lowers vacancy energy, boosts toluene activation. Tuning the oxygen species reactivity of manganese-based catalysts is critical for the efficient catalytic oxidation of volatile organic compounds (VOCs). Herein, a series of hollow spherical manganese oxide catalysts (MBN₁.₀-T) were synthesized via a two-step alkaline hydrolysis-calcination strategy using Mn-BTC as the precursor. Notably, the organic ligand trimesic acid (H₃BTC) can be efficiently recovered and reused after alkaline treatment, endowing the synthesis route with excellent atom economy. Among the obtained catalysts, MBN₁.₀-500, featuring a MnO₂/Mn₅O₈ biphasic heterostructure, delivers outstanding low-temperature catalytic performance for toluene oxidation with T₉₀ as low as 196 °C and an apparent activation energy of 29.4 kJ mol −1 . Comprehensive characterizations combined with DFT calculations reveal that the abundant heterointerfaces between MnO₂ and Mn₅O₈ significantly reduce the oxygen vacancy formation energy and enhance toluene adsorption and activation, thereby promoting the generation of reactive oxygen species and accelerating lattice oxygen mobility. In situ DRIFTS confirms that the degradation pathway of toluene proceeds as toluene → benzyl alcohol → benzaldehyde → benzoate → maleic anhydride → CO₂ and H₂O. This work not only provides a sustainable strategy for constructing high-performance MnOₓ catalysts with abundant oxygen vacancies, but also highlights the great potential of ligand recovery for industrial application. Download: Download high-res image (120KB) Download: Download full-size image
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 20
·10892-10901
·
IF 14.511
Wenfei Dong,Nan Zhang,Sanxiu Li,Shixiong Min,Juan Peng,Wanyi Liu,Dongping Zhan,Hongcun Bai
The electrocatalytic reduction of CO2 using electricity produced from renewable resources is a strategy for achieving CO2 emission reduction and sustainable energy development. Further, the reaction has a large number of industrial practical applications, since CO2 can be converted to fuels via downstream chemical processing of the CO product. Herein, we successfully synthesized a low Mn-content single-atom catalyst (SAC) with Mn–N2O2 sites, covalently integrated into carbon nanosheets (Mn–NO/CNs) using a one-pot synthesis method. The Mn–NO/CN catalyst displays efficient electrocatalytic performance for the CO2 reduction reaction (CO2RR). Using an H-type electrolytic cell, the maximum CO Faraday efficiency (FE) at −0.460 V (V vs. RHE) reaches 96.0% in 0.5 M KHCO3 electrolyte. In the flow cell measurements, Mn–NO/CNs exhibits a current density of 28 mA cm−2 at a very low potential of −0.425 V (V vs. RHE) for the CO2RR with 1.0 M KOH as the mobile phase. The FECO remains above 80% even after 70 h, demonstrating the excellent durability of the catalyst even at a very low potential. The X-ray absorption spectra (XAS) and DFT calculations show that the Mn–N2O2 site is the active catalytic center, which facilitates the adsorption of CO2 and significantly lowers the free energy barrier leading to the formation of the critical intermediate *COOH. The presence of dual N and O coordinated to the single atom metal sites embedded in the 2D carbon nanosheet significantly improves catalytic activity for the reduction of CO2. Therefore, the catalytic performance of the single atom metal catalyst can be enhanced by adjusting the coordination environment.
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高影响因子
Journal of Environmental Chemical Engineering
·
2016
·
IF 0
Ye Wang,Wenzhong Yang,Xiaoshuang Yin,Ying Liu
Comparative ozonation experiments were carried out to investigate the catalytic ability and mechanism of γ-Al 2 O 3 supported manganese oxide (Mn/γ-Al 2 O 3 ) for the degradation of phenol in aqueous solution. The results showed that 4% Mn/γ-Al 2 O 3 possessed highest catalytic efficiency for the ozonation of phenol than that of other catalysts. The influences of manganese content and catalyst dosage verified that surface hydroxyl groups affected by the solution pH and the point of zero charge (pH PZC ) of catalysts. The Mn/γ-Al 2 O 3 exerted the strongest catalytic activity at initial solution pH of 3.45. The strong interaction between ozone and Mn/γ-Al 2 O 3 was observed and confirmed as a critical step for the catalysis reaction. The surface hydroxyl groups and chemisorbed water acted as the active sites in promoting hydroxyl radicals, while Brönsted acid sites were confirmed as reactive centres for catalytic ozonation in the aqueous phase. The influence of tert -butanol showed that hydroxyl radicals and active oxygen species were involved in the catalytic ozonation of phenol. According to the X-ray photoelectron spectroscopy (XPS) results, the enhancement of electron transfer on the surface manganese oxides were responsible for the catalysis and promoting the formation of active oxygen species. A possible catalytic ozonation mechanism of phenol over Mn/γ-Al 2 O 3 was proposed.
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