JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yurong Ren,Xiaofang Lai,Minhao Guo,Ruiqi Wang,Jun Deng,Jikang Jian
Three layered quaternary sulfides, NaLi M S 2 ( M = Mn, Fe, Co) were synthesized by solid-state reactions. They adopt a trigonal CaAl 2 Si 2 -type structure (S.G. P -3 m 1) with Li and M randomly distributed at the tetrahedral metal site. Magnetic measurements reveal spin-glass ground states for these compounds, in contrast to the long-range antiferromagnetic order in the ternary counterpart NaFe 1.6 S 2 . As evidenced by electrical resistivity and optical measurements , all these three compounds show semiconducting nature, consistent with the results of first-principles calculations. The measured band gaps are 3.4 eV and 1.25 eV for NaLiMnS 2 and NaLiCoS 2 , respectively. Photoelectric measurements on NaLiCoS 2 demonstrate its potential application in photovoltaic devices .
研究领域:
材料科学
·
固体化学
·
凝聚态物理
·
无机化学
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
·
2012
·
IF 1.547
Li Zhang,Xiu-Ling Wu,An-Qi Wang,Fei Qin,Da-Wei Meng,Xiao-Yang Liu
A manganese(II) coordination polymer [Mn(TMB)2 · H2O]
n
(1) (HTMB = 3,4,5-trimethoxybenzoic acid) has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, powder X-ray diffraction analysis, spectroscopic (IR, solid state UV-Vis), and thermal methods. The crystal belongs to orthorhombic system, space group P212121, with cell parameters a = 7.3001(8), b = 11.4146(13), c = 27.053(3) Å, α = β = γ = 90°, V = 2254.3(4) Å3, Z = 4. In 1, TMB in two different coordination modes bridges six-coordinate manganese(II) centers forming a 1-D infinite chain coordination framework. The spectral and thermal properties of the complexes have also been studied.
研究领域:
无机化学
·
配位化学
·
材料科学
·
晶体工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 25
·13720-13728
·
IF 11.9
Zheng Ma,Yubo Luo,Wang Li,Yingchao Wei,Chengjun Li,Abubakar Yakubu Haruna,Zhihong Zhang,Xin Li,Qinghui Jiang,Junyou Yang
Point defects play an important role in regulating the electrical and thermal transport properties of thermoelectric materials, but it is always restricted by the solubility of dopants in the matrix. Herein, we demonstrate an effective route to enhance the solubility of Mn from 8% up to 30% in AgSbSe2 through entropy-driven alloying with MnSe. It enables us to largely enhance the carrier concentration and electrical conductivity and also reduce the lattice thermal conductivity of AgSbSe2. As a consequence, (AgSbSe2)0.7(MnSe)0.3 has a high ZT of ∼0.96 at 750 K. Moreover, a further enhanced ZT of 1.18 was achieved in (AgSbSe2)0.7(Mn0.99Se)0.3 at 750 K by the introduced Mn vacancies.
研究领域:
材料科学
·
热电学
·
固态化学
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2024
·Vol. 8
·期 23
·5524-5534
·
IF 5
Yihong Zhu,Juping Zhang,Dongfang Li,Tao Zhu,Xing Zhu
Chemical looping dry reforming of methane (CL-DRM) is an efficient pathway for the conversion of methane and CO2 into synthesis gas ready for the Fischer–Tropsch process, which largely depends on the redox behavior of oxygen carriers. Perovskite-structured metal oxides are promising candidates for CL-DRM due to the structural diversity brought about by elemental doping. Herein, we proposed to fabricate a highly active oxygen carrier via functionally designed Mn-based perovskite oxides via polymetallic doping. Cu-doping in the B-site of SrMnO3−δ reveals a significant anti-coking effect in the high-temperature continuous CH4/CO2 redox process. Ni-doping in the B-site boosts the performance of methane activation resulting in high methane conversion. Moreover, Ce-doping in the A-site elevates oxygen migration and enhances partial oxidation of methane to H2 and CO as well as the re-oxidation of reduced perovskite oxides. Considering the roles of Cu, Ni and Ce doping of SrMnO3−δ, a polymetallic-doped perovskite of Sr0.8Ce0.2Mn0.7Cu0.1Ni0.2O3−δ was synthesized and evaluated in CL-DRM. The optimized perovskite oxide demonstrated exceptional performance with a methane conversion of 85% and a CO selectivity of 93% throughout 30 redox cycles at 850 °C. In the redox reactions, the transition metals of Mn, Cu, and Ni agglomerated during the reduction but could return to a well-dispersed state after re-oxidization with CO2. The perovskite oxide exhibits self-structural-regenerability and the nano-scale agglomeration–dispersion cycle ensures the high structural stability of the material in the successive CL-DRM cycles. This study provides an important insight into the regulation of catalytic activity, oxygen mobility and carbon-resistance via doping of perovskite oxides with various kinds of compatible elements in both A and B sites.
研究领域:
材料科学
·
催化化学
·
能源工程
·
化学工程
·
可持续化学
✓ 已验证
DOI
高影响因子
IONICS
·
2024
·Vol. 30
·期 4
·2287-2298
·
IF 2.4
Lin Jie,Ding Yihong,Jin Huile,Zeng Tianbiao
The development of inexpensive, highly effective and durable electrocatalysts for hydrogen production via water electrolysis is of paramount importance. Transition metal oxides, owing to their simplicity in preparation and cost-effectiveness, have been widely investigated, particularly cobalt, nickel, and manganese oxides. Inspired by the synergies of the ternary cathode materials of lithium-ion batteries (LiNi x Mn y Co 1- x - y O 2 , NMC), a simple and feasible method was used to prepare a graphite plate as the support, and Ni and Mn were co-doped with Co 3 O 4 as an efficient water decomposition catalyst. Experimental studies indicated that the 10% Ni and 10% Mn co-doped Co 3 O 4 (Co 2.4 Ni 0.3 Mn 0.3 O 4 , CNM-811) exhibited the lowest overpotential in the oxygen evolution reaction (OER), with CNM-811 achieving an overpotential of 338 mV at 30 mA cm −2 in NaOH aqueous solution, the Tafel slope is 79.71 mV dec −1 . In the hydrogen evolution reaction (HER), an overpotential of 190 mV was attained at 10 mA cm −2 . In overall water splitting, a cell voltage of 2.048 V was achieved at 100 mA cm −2 , which was superior to many analogous catalysts reported today.
研究领域:
材料科学
·
电化学
·
能量转换
·
催化
·
可再生能源
✓ 已验证
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2024
·Vol. 37
·期 4
·667-675
·
IF 1.6
Wu Diandian,Liu Xiansong,Han Yuyan,Feng Shuangjiu,Lv Qingrong
A sample of Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 doped with four different ions was prepared using the solid method and a subsequent procedure. X-ray diffraction (XRD), energy-dispersive X-ray (EDX), and scanning electron microscope (SEM) were used to analyze the sample’s structural features, elemental distribution, and surface morphology. The study used the B-H magnetic characteristic analyzer and superconducting quantum interferometer magnetic performance measurement system to analyze the magnetic properties of Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 . The correlation becomes more surprising as the frequency increases, indicating a decrease in permeability when the magnetic field H reaches 200 A/m. Ion substitution leads to changes in magnetic crystal anisotropy, affecting permeability as the external magnetic field strength increases. We analyze the correlation between saturation magnetization and temperature in the 520–540 K range and explain the variation of saturation magnetization with temperature. The study shows that saturation magnetization decreases as temperature increases. This result suggests that saturation magnetization decreases as temperature increases. The increased super-exchange effect due to Ti and Mn occupying the (d) sites is much stronger than the reduced effect caused by Sn occupying the (a) sites. Therefore, the saturation magnetization of the Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 sample is higher than that of the undoped sample. The Curie temperature (Tc) of the Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 sample is lower than that of the undoped sample.
研究领域:
材料科学
·
凝聚态物理
·
功能材料
·
磁性材料
·
无机非金属材料
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zhongjun Zhao,Yiran Sun,Yihao Pan,Jing Liu,Jingkai Zhou,Mei Ma,Xiaozhong Wu,Xiangyan Shen,Jin Zhou,Pengfei Zhou
Layered Mn-based cathode (K x MnO 2 ) has attracted wide attention for potassium ion batteries (PIBs) because of its high specific capacity and energy density. However, the structure and capacity of K x MnO 2 cathode are constantly degraded during the cycling due to the strong Jahn-Teller effect of Mn 3+ and huge ionic radius of K + . In this work, lithium ion and interlayer water were introduced into Mn layer and K layer in order to suppress the Jahn-Teller effect and expand interlayer spacing, respectively, thus obtaining new types of K 0.4 Mn 1-x Li x O 2 ·0.33H 2 O cathode materials. The interlayer spacing of the K 0.4 MnO 2 increased from 6.34 to 6.93 Å after the interlayer water insertion. X-ray photoelectron spectroscopy studies demonstrated that proper lithium doping can effectively control the ratio of Mn 3+ /Mn 4+ and inhibit the Jahn-Teller effect. In-situ X-ray diffraction exhibited that lithium doping can inhibit the irreversible phase transition and improve the structural stability of materials during cycling. As a result, the optimal K 0.4 Mn 0.9 Li 0.1 O 2 ·0.33H 2 O not only delivered a higher capacity retention of 84.04 % compared to the value of 28.09 % for K 0.4 MnO 2 ·0.33H 2 O, but also maintained a greatly enhanced rate capability. This study provides a new opportunity for designing layered manganese-based cathode materials with high performance for PIBs.
研究领域:
储能材料
·
电化学
·
电池技术
·
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
Energy Material Advances
·
2022
·
IF 0
Renjie He,Sheng Lei,Mengchuang Liu,Mingsheng Qin,Wei Zhong,Shijie Cheng,Jia Xie
Microspinel LiMn2O4 (LMO) is a widely used cathode material in power lithium-ion batteries. However, inevitable Mn dissolution and dynamic phase instability will cause the degradation of microspinel LMO during cycling. Here, a low-tortuosity LMO (LMO-LT) electrode is fabricated by an ice-templating method, which exhibits enhanced dynamic phase stability, alleviated Mn dissolution, and rare particle microcracks during cycling. It is shown that the low-tortuosity electrode enables fast lithium-ion diffusion and thus small concentration polarization, leading to uniform electrochemical reaction within microregions of the LMO-LT electrode. Furthermore, the fast lithium-ion transport kinetics and even mesoscopic scale reactions of the LMO-LT electrode effectively alleviate irreversible phase transition and Mn dissolution as well as suppress crack generation in LMO particles. As a result, the full cell [negative-to-positive capacity ratio (N/P) = 1.1] with thick LMO-LT cathode (13 mg cm−2) and Li4Ti5O12 anode sustains 80.0% capacity over 200 cycles. The LMO-LT electrode further delivers 78.9% capacity of that at 0.1 C at the high rate of 5 C. This work provides an important strategy to enhance dynamic phase stability and suppress Mn dissolution at the mesoscopic scale, promoting the development of high-performance LMO electrodes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Wenming Shi,Che Sun,Hongjun Zhang,Yingchun Liu,Lang Bian,Yuanhao Deng,Bin Yang
High-power PZT-based piezoelectric ceramics with high electromechanical properties are in urgent demand in the market. In this study, Mn ions were introduced into 0.36 Pb(Ni 1/3 Nb 2/3 )O 3 –0.28PbZrO 3 –0.36PbTiO 3 (PNN–PZT) ceramics in the form of Pb(Mn 1/3 Nb 2/3 )O 3 (PMnN) to synthesize a quaternary piezoelectric ceramic ( x PMnN–PNN–PZT) with coexistence of rhombohedral and tetragonal phases. The addition of PMnN caused the grain sizes to continuously decrease from 3.29 μm to 1.58 μm. However, the density first increased and then decreased, reaching a maximum value of 8.02 g/cm 3 at x = 0.07. The increased internal bias field ( E i ) and domain size suppressed the domain wall motion and domain switching, reducing internal friction and improving the mechanical quality factor ( Q m ). Compared with Q m ∼146 of undoped PNN–PZT ceramics, the maximum Q m of 0.07PMnN-PNN-PZT reached approximately 2244. And the Vickers hardness of x PMnN–PNN–PZT ceramics was promoted from ∼356 HV ( x = 0) to ∼480 HV ( x = 0.07). In addition, the other optimal electromechanical performances: piezoelectric coefficient d 33 = 202 pC/N, planar electromechanical coupling coefficient k p = 0.45, Curie temperature T c = 198 and dielectric loss tan δ = 0.0059 were also achieved at x = 0.07. This work provides a feasible way for the development and application of high-power piezoelectric ceramics.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2026
·
IF 3.3
Weixin Mo,Liming Yang,Xinggui Gu,Huiyu Li,Yongjun Feng
Near-infrared (NIR)-responsive photothermal materials are critical for solar energy conversion, yet conventional materials face limitations in efficiency, stability, and spectral tunability. Herein, we report a Mn-doped Prussian blue intercalated MgAl-layered double hydroxide (Mn-PB@LDHs) synthesized via a separate nucleation and aging steps (SNAS) method, achieving synergistic enhancement in photothermal performance and stability. The optimized Mn-PB@LDH-3 exhibits a high photothermal conversion efficiency (75.10% under 808 nm laser, 0.5 W·cm⁻²) and solar-driven water evaporation performance (1.60 kg·m⁻²·h⁻¹, 97.93% under 1 kW·m⁻² simulated sunlight). Moderate Mn²⁺ doping optimizes the Prussian blue electronic structure by enhancing metal-to-metal charge transfer and reducing resistance, while excessive doping amount induces Jahn–Teller distortion and electron localization, impairing efficiency. The MgAl-LDH host confers stability via nanoconfinement (suppressing structural degradation) and electrostatic interactions (inhibiting metal leaching under alkaline conditions). This work presents a high-performance, stable photothermal material and establishes a generalizable host–guest strategy for advanced solar energy conversion applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE COMMUNICATIONS
·
2026
·
IF 2.8
Han Zheng,Dongxu Pan,Ling Zhang,Guodong Yang,Zhengfa Li
Moderate Mn doping at x = 0.01 pins ferroelectric domains, yielding slim hysteresis loops and optimal energy-storage efficiency. • Higher Mn doping of x ≥ 0.02 induces a phase transition of coexisting AFE P and FE Q phases, in which the FE Q phase can broaden hysteresis loops and increase energy-storage density. • With increasing doping content of Mn, the site of Mn substitution transitions from A site to B site. (1- x )NaNbO 3 - x MnO 2 ceramics were synthesized via solid-state reaction method. X-ray diffraction with Rietveld refinement shows that increasing Mn content induces a phase transition from a single antiferroelectric P phase ( Pbcm ) to the coexistence of P and ferroelectric Q phases ( P2 1 ma ). Scanning electron microscopy indicates that Mn doping promotes grain growth. Dielectric patterns demonstrate that moderate Mn doping with x = 0.01 effectively suppresses leakage current and reduces dielectric loss (tanδ = 0.526 at 25 °C and 56.4 MHz). Electrical measurements show that the composition of x = 0.01 achieves the optimal energy-storage efficiency, and the composition of x = 0.025 attains the recoverable energy-storage density of 0.531 J/cm 3 . The study illustrates that Mn doping tunes phase composition and defects, thereby optimizing the energy-storage properties of lead-free NaNbO 3 -based ceramics.
✓ 已验证
DOI
高影响因子
Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·420
·
IF 38.5
Du Wenqing,Xu Lin,Yang Yi,Sun Jingying,Yang Gongzheng,Wang Chengxin
A degradation chain reaction triggered by Mn dissolution is revealed, clarifying the continuous performance deterioration caused by Mn dissolution.
A strategy for in situ surface repair is proposed, which achieves long-term stability through the synergistic action of high-concentration electrolyte and Fe 3+ filling of Mn vacancies.
After 20,000 cycles at a current density of 2 A g −1 , the repaired electrode exhibited a capacity retention rate of 80%, outperforming most previously reported manganese-based aqueous sodium-ion battery cathodes.
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）