NANOTECHNOLOGY
·
2020
·Vol. 31
·期 42
·424004
·
IF 3.551
Shengjian Jiao,Dongfeng Xue
Ever-increasing global energy consumption has increased aggregate demand on electrochemical energy storage devices with high energy density. Over the past few decades, manganese oxides have attracted wide attention due to their abundant reserves, low cost, environmental friendliness, and high theoretical capacity. However, most reported manganese-based materials have exhibited capacity far below the theoretical capacity, which was only on the basis of Mn3+/Mn4+ couple. The rich chemistry of manganese enables it to exist in various valence states, such as Mn0, Mn2+, Mn3+, Mn4+, and Mn7+, providing great opportunity for discovering new manganese-based electrode systems. Herein, we formed a Mn2+/Mn4+ couple from a manganese-based colloidal system with rare earth (RE) modification, which was formed in-situ on nickel (Ni) foam in KOH electrolyte under an electric field assistance. The Mn-based colloidal electrode, with Mn:Ce mass ratio of 1:0.5, achieved a high specific capacitance of 2985 F g–1 at 3 A g–1, which was higher than the theoretical capacity of 2193 F g–1 on the basis of the Mn3+/Mn4+ couple. After the addition of Ce3+, the prepared sample exhibited improved rate capability performance. Our manganese-based colloidal electrode with RE modification delivered a high specific capacitance of 1223 F g–1 at 20 A g–1, with 54.5% retention of 2243 F g–1 at 3 A g–1 at Mn:Ce mass ratio of 1:0.05. Colloidal electrode systems involving Mn-based colloids are a novel way to engineer the electrochemical performance of inorganic materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 43
·22763-22772
·
IF 11.301
Jiaxi Xue,Yajing Wang,Cui Sun,Pan Xu,Xiaoxiang Fan,Jingmin Fan,Mingsen Zheng,Quanfeng Dong
Li-rich Mn-based materials, as high-energy-density and low-cost cathode materials for Li-ion batteries, suffer severe irreversible voltage fading and capacity loss during cycling, associated with the instability of crystal structure at high voltage, which greatly reduces the specific energy density after cycling and thus impedes their commercialization. Here, we introduce a new strategy to mitigate voltage fading and improve the cycling performance of Li-rich Mn-based cathode materials by simply introducing MgSO4 in the cathode during its preparation process. The results show that cycling stability and voltage fading of corresponding batteries were dramatically improved due to the high Li+ retention at the initial charge process and the stable cathode electrolyte interface (CEI) layer. After 100 cycles at 1C, the average discharge voltage decay is only 0.115 V (1.15 mV per cycle), with a high voltage retention of 96.7%, and the capacity remains at 91.5% after 300 cycles at 1C.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Gang Liao,Lanlan Yu,Yufen Xia,Zhimin Wang,Zijun Lu,Jicheng Mei,Huiling Liu,Chengbin Liu
A sustainable supply of lithium from salt-lake brines is necessary due to the surge in demand of the lithium-battery market. However, the presence of coexisting ions, particularly Na + , poses a significant challenge due to the similarities in charge, electronic structure, and hydrated size. The electrochemical system with manganese (Mn)-based lithium-ion (Li + ) sieves electrodes is a promising method for Li + recovery, but often suffers from geometric configuration distortion, which reduces their selectivity and capacity. In this work, we developed a boron-modified H 1.6 Mn 1.6 O 4 (HMO-B) material for Li + extraction through hybrid capacitive deionization (HCDI) intercalation. Characterizations and theoretical calculations verified that the formation of the B O bond reduces the lattice constant, significantly inhibiting the Jahn–Teller distortion of Mn 3+ , thereby stabilizing the crystal structure. The transformation of Mn 3+ to Mn 4+ effectively prevents Mn dissolution during the electro-de-intercalation process. B doping narrows the lattice spacing and increases the intercalation energy difference between Li + and Na + . Consequently, HMO-B exhibits an outstanding Li/Na selectivity of 1211.68. The reduction in interface impedance improves current efficiency, while the increase in specific surface area provides abundant recognition sites for Li + , enhancing Li + intercalation performance from 14 mg g −1 day −1 for HMO to 34.94 mg g −1 h −1 for HMO-B. Additionally, Mn dissolution reduces from 7 % for HMO to 1.13 % for HMO-B after 10 cycles. This work holds substantial practical value for the selective Li extraction from salt lake brine and is anticipated to provide a stable Li supply for the burgeoning new energy industry.
研究领域:
材料科学
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环境科学
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电化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Jianhui Zhao,Zhiwei Zhao,Ning Li,Jun Nan,Ruixin Yu,Jinying Du
Valence state heterostructure exhibits great potential for contaminants remediation from water and wastewater with effective charge separation and little energy loss. However, the preparation process commonly shows complex with uncontrolled manner, forming undesired valence states, which hinders the advancement of valence state heterostructure. Herein, an Oxone induced strategy is established to controllably design manganese-based valence state heterostructure for the first time. A superior Mn 2 O 3 /Mn 3 O 4 /MnO 2 (molar ratio of 3:1:2) photocatalyst with dual Ⅱ heterostructures was generated by Oxone (0.3 mM) induced Mn 2 O 3 (0.2 g/L) under visible light. The Mn 2 O 3 /Mn 3 O 4 /MnO 2 heterojunction achieved 95.6% removal and 63.9% mineralization of ciprofloxacin (cipro) under visible light irradiation for 40 min. The excellent catalytic performance was derived from the improved surface area, decreased isoelectric point, enhanced light absorption and efficient charge separation of the Mn 2 O 3 /Mn 3 O 4 /MnO 2 heterostructure. Moreover, the radicals trapping experiment and Electron paramagnetic resonance (EPR) measurement revealed the dominant roles of holes and superoxide radicals for cipro degradation. Furthermore, the reusable Mn 2 O 3 /Mn 3 O 4 /MnO 2 could remove cipro selectively with co-existing natural organic matters and inorganic ions, which exhibited high practicability in real waters. Impressively, this work provides an innovative approach for controllable design of valence state heterostructure and fabricates a promising photocatalyst towards antibiotics degradation.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Materials Today Physics
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2022
·
IF 11.021
Tao Huang,Qilin Wei,Wenchao Lin,Hui Peng,Shangfei Yao,Bingsuo Zou
In this paper, a new zero-dimensional organic-inorganic hybrid manganese bromide single crystal with high-efficiency yellow-green emission has been synthesized by inserting C 6 H 16 N 2 2+ into [MnBr 4 ] 2- tetrahedrons lattice, and its PLQY reaches up to 89%. At the same time, the relationship between the emission wavelength and relaxation process under CW laser excitation was investigated in this single crystal, exhibiting different emission colors under continuous-wave laser excitation of different wavelengths. The results show that the distance between the nearest Mn 2+ in the lattice is 6.8 Å, this number brings up a very weak ferromagnetic coupling state and a dominant paramagnetic state, which lead to a significant emission band at 550 nm and a weak emission band at about 640 nm when excited by 325 nm laser. The high-level d-d transition at about 400 nm and AFM d-d transition at 458 nm band could be found simultaneously under continuous-wave laser excitation above the bandgap, and the photophysical properties of the multiple emission bands and the microscopic interactions of the spin, carrier, and phonon inside the lattice have been discussed. These findings provide a new direction for Mn-based materials in the field of luminescence and provide ideas for the development of new materials with the microscopic interaction modulation of the spin, carrier, and phonon.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Energy Advances
·
2022
·Vol. 1
·期 12
·1065-1070
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IF 0
Wenshan Gou,Hao Chen,Zhao Xu,Yifei Sun,Xuguang Han,Mengmeng Liu,Yan Zhang
Rechargeable aqueous zinc-ion batteries (AZIBs) are promising for large-scale energy storage due to their high safety and low cost but the reported cathode materials still suffer from limited specific capacities and poor cycle performance. Herein, the Mn-based metal–organic framework (MOF), MOF-73, is used for the first time to make a novel cathode for AZIBs and its great capacity enhancement mechanism is investigated. Results show that MOF-73 can render a voltage plateau of ∼1.45 V and induce manganese ions to co-contribute a high-specific capacity of 815 mA h g−1 (0.84 mA h cm−2). This work sheds light on the fundamentals of the electrochemical zinc energy storage of MOFs while holding great promise for exploring novel MOFs as cathodes for AZIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
INORGANIC CHEMISTRY
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2022
·
IF 5.436
Zhi-Cheng Zhang,Tie Zhang,Chang-Yuan Su,Meng-Meng Lun,Yi Zhang,Da-Wei Fu,Qi Wu
Lead-free Halides, especially Mn-based ones, are preferred as hotspots in the exploration of photoluminescent materials. However, there are few reports on sensitive reversible thermochromism and switchable dual emission originating from self-trapped exciton emission in pure Mn-Based materials. Here, we report a new Mn-based hybrid material [TMPA]2MnI4 (TMPA = trimethylphenylammonium), which shows two emission peaks at 545 and 660 nm benefitting from the d–d orbital transition of Mn2+ and the generation of self-trapped excitons, respectively. Due to the different sensitivity to temperature, the stages of thermal activation and thermal quenching of the two emission types are also inconsistent, showing a certain competition relationship and dominating the emission colors in different temperature ranges, resulting in adjustable green–orange–green thermochromic luminescence from 100 to 403 K (both high and low temperatures correspond to green, and orange is displayed at near room temperature). Therefore, thermochromic luminescence can be easily achieved by controlling the temperature under the guidance of excited states. This work provides new insights into the synthesis and application of thermochromic materials. Therefore, it is certain that regulating temperature while being guided by excited states will achieve thermochromic luminescence. This research offers fresh perspectives on the development and potential of thermochromic materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shuyue Li,Dongxu Yu,Lina Liu,Shiyu Yao,Xiaoqi Wang,Xu Jin,Dong Zhang,Fei Du
Rechargeable aqueous zinc-ion batteries (AZIBs) have attracted widespread attention as a sustainable energy storage system owing to the safe aqueous electrolyte. Manganese-based materials are potential cathodes for AZIBs, whereas, the dissolution of manganese would result in the significantly decline of capacity and unsatisfied lives. Herein, an in-situ electrochemical induced artificial solid electrolyte interphase (SEI), (Zn(OH) 2 ) 3 (ZnSO 4 )(H 2 O) 5 nanoflakes, is discovered to generate and coat on the surface of MnO@C in the initial charging process which could prevent the direct contact between the electrolyte and electrode with the result of inhibiting the excessive dissolution of manganese oxides. Benefiting from the artificial SEI, MnO@C exhibits an extremely excellent cycle performance with 0.003% capacity decay per cycle over 10,000 cycles without Mn 2+ additive in electrolyte. Moreover, MnO@C is proved to demonstrate a (de)intercalation reaction mechanism after the electrochemical activation process in initial charging process. The strategy proposed in this study provides a new proposal to develop high stable manganes oxide cathodes for AZIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 34
·2204499
·
IF 19.924
Yue Liu,Xinfeng Zhou,Zirui Jia,Hongjing Wu,Guanglei Wu
Polymeric metal-organic framework (MOF)-derived composites are promising functional materials because of their exceptional chemical homogeneity, designable components, and adjustable pore size. The modulation of oxygen and Mn vacancies via the introduction of heteroatoms and changes in the annealing temperature in MOFs-derived composites can be a possible solution to investigate the polarization loss mechanism, which facilitates the improvement of electromagnetic loss capacity. Herein, the design of laminate-stacked sphere-shaped trimetallic CoNiMn-MOFs is presented. The derived CoNi/MnO@C composites retain the original topography of the MOFs. The concentration of oxygen vacancies increases with the incorporation of heteroatoms, but decreases with annealing temperature, which prevails in the polarization loss mechanism rather than the contribution of Mn 2+ vacancies and heterogeneous interfaces. Therefore, the minimum reflection loss of the CoNi/MnO@C sample demonstrates −55.2 dB at 2.6 mm and the broad effective absorption bandwidth reaches 8.0 GHz at 2.1 mm. This work is expected to provide meaningful insights into the significant effect of ion vacancy modulation on the EM wave-absorbing performance of Mn-based MOFs-derived composites.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Xiaopeng Wei,Jian He,Yin Zhu,Zixiao Qin,Guoyuan Zheng,Rui Zhang,Shuyi Mo,Jilin Wang,Disheng Yao,Bencai Lin,Nan Tian,Bing Zhou,Fei Long
Organic metal halides (OMHs) have attracted considerable attention in the field of materials science because of their low cost, easy structure adjustment, and excellent optoelectronic properties. In this study, we synthesized a new organic manganese halide single-crystal, viz. (C 6 H 9 N 2 ) 2 MnI 4 . The single crystal belongs to the triclinic crystal system with a centrosymmetric P-1 space group. The optical bandgap (2.21 eV) of yellow (C 6 H 9 N 2 ) 2 MnI 4 is close to the narrow bandgap and has a wide excitation range, with an optimal excitation wavelength of 468 nm. Among reported tetrahedrally coordinated manganese-based OMHs luminescent materials , yellow-green fluorescence emission is rare. (C 6 H 9 N 2 ) 2 MnI 4 also has a high fluorescence quantum efficiency of 67% and a fluorescence lifetime of 44 μs, and can be used to fabricate a light-emitting diode (LED) device with a luminous efficiency of 9.61 lm/W, thus expanding the applications of organic manganese halide materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2018
·Vol. 25
·期 6
·2585-2594
·
IF 2.347
Meng Fanbo,Guo Huajun,Wang Zhixing,Wang Jiexi,Yan Guochun,Wu Xianwen,Li Xinhai,Zhou Lijiao
A series of layered Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 cathode materials, of which manganese source was electrolytic manganese dioxide, with different contents of SO 4 2− were successfully synthesized via ball-milling process and solid-state sintering method. The obtained materials were characterized by XRD, XPS, SEM-EDS, C-S, ICP, and HR-TEM. All the obtained materials presented well-ordered layered structure. When the content of SO 4 2− was below 1.30 wt%, the electrochemical properties and structural stabilities at low rate for the layered materials with SO 4 2− were not changed dramatically, while when the content of SO 4 2− increased to 5.85 wt%, the initial discharge capacities decreased dramatically from 248.24 to 209.23 mAh g −1 at 10 mA g −1 . And the pristine sample shows excellent cyclic property and rate capability. It delivered the discharge capacity of 175.25 mAh g −1 after 100 cycles with the highest capacity retention of 90.67% at 200 mA g −1 . Particularly, the treated Li-rich Mn-based materials with the highest amount of SO 4 2− exhibited the best cyclic stability and it delivers the highest capacity retention of 95.17% after 100 cycles at 200 mA g −1 . However, its discharge capacities were much lower than the pristine material. As a result, the addition of SO 4 2− could promote side reactions between electrode and electrolyte and deep-degree corrosion of electrode materials to affect the electrochemical properties and structural stabilities of the Li-rich Mn-based materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 48
·27651-27659
·
IF 12.732
Ming-Hui Cao,Ren-Yan Li,Shi-Ya Lin,Shao-Di Zheng,Lu Ma,Sha Tan,Enyuan Hu,Zulipiya Shadike,Xiao-Qing Yang,Zheng-Wen Fu
Owing to the abundance of raw material reserves and low cost, Na-ion batteries (NIBs) have successfully gained widespread attention from academic and industrial communities in the past few decades. However, the insufficient cathode energy density is still one of the critical bottlenecks restricting the development of NIBs. Following a strategy of introducing Li+ into the transition-metal (TM) layer to enhance the oxygen redox reaction, a novel layered cathode material P2-Na0.6Li0.11Fe0.27Mn0.62O2 (NLFMO) was designed and successfully synthesized. This NLFMO cathode not only delivers a large initial reversible capacity of 207.3 mA h g−1, but also shows a good cycling performance (104.2 mA h g−1 after 80 cycles) and rate capability (126.2 mA h g−1 at 1C). The ultrahigh capacity is contributed by both cationic (Fe3+/Fe4+ and Mn3+/Mn4+) and partially reversible anionic redox (O2−/On−) reactions, revealed by in situ X-ray absorption spectroscopy (XAS) and X-ray photoelectron spectroscopy (XPS) techniques. Moreover, no detrimental P2–O2 phase transition was observed in ex situ X-ray diffraction (XRD) patterns, confirming the high structural stability during Na+ deintercalation/intercalation processes. These results provide valuable information about the high-energy density layered cathode materials based on anionic redox reactions for NIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固体化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）