DALTON TRANSACTIONS
·
2025
·
IF 3.3
Qing-Ling Cao,Wen-He Zhong,Jie-Yu Zhu,Cai-Hong Shi,Jia-Jia Zhao,Li-Zhuang Chen
Organic–inorganic hybrid metal halides have emerged as promising luminescent materials owing to their structural tunability and exceptional photoluminescence modulation capabilities, showing great potential in optoelectronic applications. Herein, we report the successful design of a novel series of zero-dimensional (0D) Mn(II)-based organic–inorganic hybrid halides with enhanced photoluminescence quantum yields (PLQYs) through strategic organic cation engineering. Specifically, in this paper, the methyl group (–CH3) at the fourth position of the benzene ring in the organic cation was replaced with hydrogen (–H) and cyano (–CN) groups. The average distance of Mn⋯Mn was successfully adjusted from 8.925 Å to 8.970 Å and 8.986 Å, and the PLQY was modulated from 35.74% to 59.04% and 81.38%. This work establishes a new paradigm for rationally designing high-performance luminescent materials through molecular-level structural engineering, providing valuable insights for developing advanced optoelectronic devices in sensing, information encryption, and radiation detection applications.
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高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Yi Chen,Xuedan Xie,Jiangtao Jing,Yonghua Wang,Danfeng Cui,Dan Liu,Chenyang Xue
The combination of pseudocapacitive electrodes with ionic liquid (IL) electrolytes demonstrates a significant synergistic effect in expanding the potential window of supercapacitors, thereby enhancing the energy density of the device. Mn 3 (HHTP) 2 , a metal-organic framework (MOF) with high-density redox-active sites and hierarchical porosity, serves as the electrode material paired with [EMIM][BF 4 ] and [EMIM][TFSI] IL electrolytes. The ion size in [EMIM][TFSI] can be precisely aligned with the electrode pore size, thereby reducing interfacial resistance and enhancing ion accessibility. Optimizing the [EMIM][TFSI]/acetonitrile mass ratio to 4:6 achieves superior electrolyte properties, including an ionic conductivity of 50.4 mS cm −1 and viscosity of 5.24 mPa·s. This design extends operating potential from 8 V to 13 V, increasing energy density to 108.0 Wh kg −1 , representing a 68.8 % improvement over baseline systems. The device retains 94.34 % capacitance after 2000 cycles at 8 V, with specific capacitances of 7.2 F g −1 at 8 V and 4.6 F g −1 at 13 V. These findings establish a new paradigm for interface engineering in high-voltage supercapacitors.
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高影响因子
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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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Yin-Xia Sun,Li-Ping Liu,Xue Bai,Lu-Lu Gao,Wen-Qing Hu,Wen-Yu Han,Yu Sun,Zhe-Peng Deng,Wan-Hong Sun,Jian-Jun Wang,Li Xu
Developing high-sensitivity hydrogen peroxide (H 2 O 2 ) sensors is crucial. Metal organic frameworks (MOFs) are considered one of the ideal materials for developing H 2 O 2 sensors for their adjustable pore size and diverse topological structures. In this work, solvothermal synthesis is utilized CQD@Mn-MOF using carbon quantum dots (CQDs) and two-dimensional Mn-MOF ([Mn(Tib)(H 2 O) 3 ]·(TPA)·3H 2 O, Tib = 1,3,5-triamidazolylbenzene, TPA = terephthalic acid) as precursors. Interestingly, CQD@Mn-MOF as an electrochemical sensor can effectively detect H 2 O 2 with a lower detection limit of 14.7 μM, and higher sensitivity (approximately 5 times that of pure Mn-MOF). CQD@Mn-MOF sensor is capable of detecting H 2 O 2 with high selectivity in the presence of other interfering agents such as proline, ascorbic acid, glucose, and various metal salts. In addition, CQD@Mn-MOF electrochemical sensor has been used to effectively determine the H 2 O 2 content in actual beverages such as fruit juice and beer. The sensing mechanism has been reasonably analyzed that the MnO 2 produced by Mn 2+ + H 2 O 2 = MnO 2 + 2H + reaction acts as a specific catalyst for H 2 O 2 decomposition reaction (MnO 2 + H 2 O 2 + 2H + = Mn 2+ + O 2 + 2H 2 O). This sensing mechanism further ensures the high selectivity of the sensor for H 2 O 2 . Significantly, the introduction of CQD not only improves the conductivity of Mn-MOF, but also can provide more active sites in the catalytic reaction, improve the contact area and reaction rate of the reaction, and improve the catalytic performance of Mn-MOF, further improve the sensitivity.
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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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SUPERCONDUCTOR SCIENCE & TECHNOLOGY
·
2025
·
IF 4.2
Kuan Li,Longfu Li,Lingyong Zeng,Yucheng Li,Rui Chen,Peifeng Yu,Kangwang Wang,Zaichen Xiang,Tian Shang,Huixia Luo
Medium/high-entropy alloys (MEAs-HEAs) and rhenium-based compounds with a non-centrosymmetric (NC) structure have received a lot of attention for offering a fertile soil in search for unconventional superconductivity. Here, five previously unreported NC Re-based MEA-HEA superconductors with an α-Mn lattice are successfully synthesized, with their superconducting transition temperatures (Tcs) ranging from 4 to 5 K. An increase in the superconducting transition temperature (Tc) can be achieved by modulating the valence electron count (VEC) through compositional adjustments. Magnetization measurements confirm that all the synthesized Re-based MEA-HEAs are bulk type-II superconductors. Specific heat analysis reveals that the superconducting state of these HEAs can be well described by a single-gap s-wave model. Our results show that the Kadowaki-Woods ratio (KWR) of these α-Mn MEA/HEA superconductors are close to the typical value of heavy fermion compounds, suggesting the existence of strong electronic correlation. These findings provide promising material platforms to study the role of high disorder in the origin of superconductivity in the NC MEAs-HEAs.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2025
·Vol. 172
·期 4
·040508
·
IF 3.3
Xiaola Li,Huihong Gong,Wenjie Huang,Wenzhao Huang,Ziyang Liang,Yuqing Liu,Boyang Zhang,Shuxing Wu,Chenyu Liu,Zhan Lin,Dong Luo
Li-rich Mn-based layered oxides (LLOs) are regarded as one of the most promising next-generation cathodes for lithium-ion batteries (LIBs) due to their ultra-high capacity and low cost. However, the redox behavior of oxygen under high voltage induces severe challenges, including voltage hysteresis and voltage decay, which have become major obstacles to their commercialization. This work optimizes the oxygen redox process of O2-type LLOs by regulating the Na content in P2-type Na-based intermediates. Experimental results demonstrate that samples prepared by intermediates with optimal Na content show higher reversibility and reduction potential of oxygen redox. Meanwhile, the migration and dissolution of transition metals in the optimized samples are effectively suppressed. Therefore, the optimized samples deliver an improved voltage stability and alleviated voltage hysteresis. This work suggests that the oxygen redox process can be regulated and provides a practical solution to mitigate voltage decay and hysteresis in LLOs.
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Defence Technology
·
2025
·
IF 5.9
Mingcheng Ge,Xian Xu,Ze Su,Ye Zhong,Binfang Yuan,Huisheng Huang,Jianguo Zhang,Zhimin Li
Combustion catalyst is a key modifier for the performance of composite solid propellant. To exploit high-efficiency combustion catalyst, a fascinating bimetallic metal-organic framework [MnCo(EIM) 2 (DCA) 2 ] n (1) was constructed by an active dicyandiamide (DCA) linker, Mn 2+ , Co 2+ centers, and an 1-ethylimidazole (EIM) ligand. 1 possesses good thermal stability ( T p = 205 °C), high energy density ( E g = 24.34 kJ/g, E v = 35.93 kJ/cm 3 ), and insensitivity to impact and frictional stimulus. The catalytic effects of 1 contrasted to monometallic coordination compounds Mn(EIM) 4 (DCA) 2 (2) and Co(EIM) 4 (DCA) 2 (3) on the thermal decomposition of AP/RDX composite were investigated by a DSC method. The decomposition peak temperatures of AP and RDX of the composite decreased to 335.8 °Cand 206.4 °C, respectively, and the corresponding activation energy decreased by 27.3% and 43.6%, respectively, which are better than the performances of monometallic complexes 2 and 3. The gas products in the whole thermal decomposition stage of the sample were measured by TG-MS and TG-IR, and the catalytic mechanism of 1 to AP/RDX was further analyzed. This work reveal potential application of bimetallic MOFs in the composite solid propellants.
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Materials Chemistry Frontiers
·
2025
·
IF 6.4
Qianrong Jin,Yuexiao Pan,Yali Tang,Suqin Chen,Jun Zou,Yingnuo Chen
The exploration of novel phosphors with excellent properties is of great significance for both fundamental research and practical applications in optoelectronic devices. In this study, we report the synthesis of a new 0 dimensional (0D) organic-inorganic hybrid metal halide (OIHMH), C6H14N2ZnCl4, upon doping with Mn²⁺ ions, it exhibits bright green emission centered at 535 nm, originating from the d-d transition of tetrahedrally coordinated Mn²⁺ ions. The sample achieve photoluminescence quantum yields (PLQYs) of 70% at a doping concentration of 40% and demonstrate good thermal stability, with luminescence intensity restored after a heating-cooling cycle. The as-prepared Mn²⁺-doped C6H14N2ZnCl4 crystals were further utilized to fabricate white light-emitting diodes (WLEDs), which demonstrated good performance with a correlated color temperature (CCT) of 6003 K and a color rendering index (CRI) of 79. Additionally, the bright green emission of the doped crystals was explored for anti-counterfeiting applications, showing promising potential in security marking. This work highlights the potential of Mn²⁺-doped OIHHPCs as high-performance phosphors for optoelectronic applications and security purposes.
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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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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xiong Zhao,Jianwu Wei,Jing Li,Xianli Li,Anxiang Guan,Peican Chen,Liya Zhou,Jie Tian,Jiahong Pan,Binbin Luo,Qi Pang
Advanced photocatalytic architectures for sustainable CO 2 reduction encounter two significant challenges involving severe electron-hole recombination and limited active sites. Herein, we synthesize a Z-scheme heterojunction composing of Mn-doped CsPbBr 3 nanoplatelets (Mn-CPB) and zinc phthalocyanine (ZnPc) via self-assembly. Mn 2 + doping in CsPbBr 3 induces spin polarization, creating spin-polarized hot electrons. These electrons transfer via the Z-scheme interface to ZnPc’s Zn 2+ center, thereby enhancing photocarrier separation and mobility and promoting CO 2 adsorption-activation. The heterostructure achieves an exceptional CO evolution rate of 15.17 μmol g −1 h −1 with 78.31 % selectivity, surpassing the performance of individual components under visible light. In-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and density functional theory (DFT) calculations confirm the formation of key intermediates (•CO 2- ) during CO 2 adsorption and reduction. This work presents a strategy integrating spin regulation with interfacial band alignment, advancing perovskite-derived photocatalysts for solar-to-chemical conversion.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Xiangdong Zhu,Caiyan Shen,Tian Qiu,Yu Zhang,Wei Xu,Guorong Hu,Yanbing Cao,Zhongdong Peng,Ke Du
Driven by the growing demand for energy density of lithium-ion batteries, ultra-nickel- rich layered oxides LiNi x Co y Mn z O 2 (x > 0.9) (ultra-Ni-rich NCM) cathodes attract considerable attention. However, these cathode materials suffer from severe structural degradation during cycling, primarily due to phase transitions, which significantly hinders their long-term application. In this work, ultra-Ni-rich NCM cathode materials with Co- and Mn-rich surface architectures are synthesized using Co/Mn-rich shell precursors and are systematically investigated to evaluate the suitability of different surface chemistries under various electrochemical conditions. The results reveal that the Co-rich surface significantly enhances the electrochemical kinetics by mitigating the Li + concentration gradient between the surface and bulk, thereby effectively suppressing structural degradation. In contrast, the Mn-rich surface, due to the presence of electrochemically inert Mn 4+ , leads to sluggish kinetics and incomplete phase transitions within the voltage window of 2.8–4.3 V. This results in a lower capacity but notably improved structural integrity. Upon increasing the upper cutoff voltage to 4.4V, the Mn-rich shell cathode undergoes more complete phase transitions, leading to a substantial improvement in capacity while maintaining superior structural stability.
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