Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 17
·6827-6836
·
IF 8.067
Min Rao,Yihui Zhu,Zhiying Zhang,Tao Yang,Xiaoshi Hu,Dexuan Huo,Dexin Yang
Substitution of lead (Pb) with environmentally friendly germanium (Ge) is a very important and promising method to reduce the toxicity and improve the efficiency and stability of perovskite films for practical applications in light-emitting diodes (LEDs) and solar cells. However, a previous study shows that the efficiency of LEDs based on the germanium–lead (Ge–Pb) perovskites will decrease as the Ge content exceeds 30%, due to trap-assisted recombination. Here we demonstrate highly luminescent sky-blue Ge0.3Pb0.7-based perovskite films with photoluminescence quantum efficiencies (PLQEs) of up to 48%, showing a relative improvement of 17% over similarly prepared Ge-free, Pb-based ones. The PL stability of the Ge0.3Pb0.7-based perovskite films is also relatively improved compared to that of the Pb-based ones. The reasons of the PL efficiency and stability improvement are discussed in this study. The symmetry-adapted shear strain variations related to the suppression of the Jahn–Teller distortion after Ge substituting could play an important role in increasing the stability of the Ge-inclusion perovskites.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 1
·179-185
·
IF 8.897
Zhang Chunguang,Zhang Meiran,Zheng Wei,Wei Jiaojiao,Wang Shiteng,Huang Ping,Cheng Xingwen,Dai Tao,Chen Zhuo,Chen Xueyuan
Inorganic luminescent nanocrystals (NCs) doped with main-group ns 2 -metal ions have evoked tremendous interest in many technological fields owing to their superior optical properties. Herein, we report a new class of luminescent nanoprobes based on 5s 2 -metal Sb 3+ -doped CaS NCs that are excitable by using a near ultraviolet light-emitting diode. The optical properties and excited-state dynamics of Sb 3+ in CaS NCs are comprehensively surveyed through temperature-dependent steady-state and transient photoluminescence (PL) spectroscopies. Owing to the strong electron-phonon coupling of Sb 3+ in CaS NCs, Sb 3+ ions experience a dynamic Jahn-Taller distortion on the excited state, which results in bright green PL of Sb 3+ with a broad emission band, a large Stokes shift, and a high PL quantum yield up to 17.3%. By taking advantage of the intense PL of Sb 3+ , we show in proof-of-concept experiments the application of biotinylated CaS:Sb 3+ NCs as sensitive luminescent nanoprobes for biotin receptor-targeted cancer cell imaging and zebrafish imaging with a high imaging contrast. These findings provide fundamental insights into the excited-state dynamics of Sb 3+ in CaS NCs, thus laying a foundation for future design of novel and versatile luminescent nanoprobes via main-group ns 2 -metal doping.
研究领域:
材料科学
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光学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2016
·
IF 4.82
Yu-Hang Fan,Xiao-Ming Jiang,Bin-Wen Liu,Shu-Fang Li,Wei-Huan Guo,Hui-Yi Zeng,Guo-Cong Guo,Jin-Shun Huang
Two new phases in the Ag–Cd–P–S system containing two second-order Jahn–Teller (SOJT) distorted d10 cations (Cd2+ and Ag+), namely, Ag2Cd(P2S6) (1) and AgCd3(PS4)S2 (2), are obtained via medium-temperature solid-state synthesis. Compound 1 exhibits a two-dimensional layered structure and undergoes a first-order structural phase transition at approximately 280 °C. This outcome can be ascribed to the significant mismatch in the expansion coefficients between Cd–S (Ag–S) and P–P (P–S) bonds evaluated through bond valence theory. The three-dimensional non-centrosymmetric (NCS) framework of 2 is constructed by two types of tetrahedral layers consisting of corner-shared CdS4, AgS4, and PS4 tetrahedra. Compound 2 exhibits second harmonic generation (SHG) intensity of 0.45 times that of commercial AgGaS2 (AGS) at a laser irradiation of 1.85 μm and an optical band gap of 2.56 eV, and no intrinsic vibrational absorption of chemical bonds is observed in the range of 2.5–18.2 μm. Both phase transition in 1 and SHG properties in 2 are closely related to the SOJT distorted d10 cations and diverse phosphorus–sulfur polyanions (PaSb)n−, which together can easily result in NCS distorted structures and interesting properties.
研究领域:
材料科学
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固体化学
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光学材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Tingting Yang,Yalan Huang,Jian Zhang,He Zhu,Jincan Ren,Tianyi Li,Leighanne C. Gallington,Si Lan,Ligao Yang,Qi Liu
Iron- and manganese-based layered metal oxides, as cathodes for sodium ion batteries, have received widespread attention because of the low cost and high specific capacity. However, the Jahn-teller effect of Mn 3+ ions and the resulted unstable structure usually lead to continuously capacity decay. Herein, Titanium (Ti) has been successfully doped into Na 2/3 Fe 1/3 Mn 2/3 O 2 to suppress the Jahn-Teller distortion and improve both cycling and rate performance of sodium ion batteries. In situ high-energy synchrotron X-ray diffraction study shows that Ti-doped compound (Na 2/3 Fe 1/3 Mn 0.57 Ti 0.1 O 2 ) can maintain the single P2 phase without any phase transition during the whole charging/discharging process. Various electrochemical characterizations are also applied to explore the better kinetics of sodium ions transfer in the Na 2/3 Fe 1/3 Mn 0.57 Ti 0.1 O 2 . This work provides a comprehensive insight into the Ti-doping effects on the performance from both structural and electrokinetic perspectives.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Particuology
·
2025
·
IF 4.3
Yiying Wang,Dandan Shi,Yue Cao,Xing Han,Tianying Zhang,Kaipeng Zhong,Qi Zhao,Naicai Xu,Shaoju Bian
Driven by the increasing global demand for lithium, significant attention has been directed toward developing efficient technologies for lithium extraction from Salt Lake brines. Li 1.6 Mn 1.6 O 4 spinel shows high lithium selectivity and notable theoretical uptake capacity, indicating strong application potential in lithium extraction. However, the industrial application of this material is limited by its strong Jahn-Teller effect and manganese dissolution loss. In this study, LiOH and MnCO 3 were selected as the raw materials and La 2 O 3 was used as the doping modifier. The La 3+ -doped Li 1.6 Mn 1.6 O 4 precursor (La-LMO) was fabricated through hydrothermal and high-temperature solid-phase synthesis techniques. Then La 3+ doped H 1.6 Mn 1.6 O 4 lithium ion-sieve (La-HMO) was prepared by pickling. The materials' structure and morphology were examined using XRD, SEM, TEM, and XPS techniques. La 3+ doping does not alter the spinel structure of LMO but reduces Mn 3+ content, mitigates the Jahn-Teller effect, lowers the manganese dissolution rate, and enhances structural stability. Adsorption of Li + onto La-HMO follows pseudo-second-order kinetics and fits the Langmuir model, suggesting homogeneous monolayer adsorption driven by chemisorption. In the lithium extraction experiment from the brine of West Tai Kinel Salt Lake, La-HMO demonstrated high adsorption capacity and superior selectivity for Li + . After five cycles, La-HMO maintained an adsorption capacity of 33.10 mg/g, higher than the 26.80 mg/g for undoped HMO. The manganese dissolution rate dropped from 4.65% to 4.04%. The study significantly improved the adsorption properties and structural stability of HMO by doping La 3+ , which has broad application prospects in the separation and extraction of lithium resources in Salt Lake.
研究领域:
材料科学
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化学工程
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无机化学
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环境科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 35
·2301360
·
IF 13.3
Hui Fang,Haocheng Ji,Jingjun Zhai,Chaoqi Wang,Chen Zhu,Guojie Chen,Mihai Chu,Taolve Zhang,Zhewen Ma,Wenguang Zhao,Wenhai Ji,Yinguo Xiao
Layered transition metal oxides are promising cathode materials for sodium-ion batteries due to their high energy density and appropriate operating potential. However, the poor structural stability is a major drawback to their widespread application. To address this issue, B 3+ is successfully introduced into the tetrahedral site of Na 0.67 Fe 0.5 Mn 0.5 O 2 , demonstrating the effectiveness of small-radius ion doping in improving electrochemical performance. The obtained Na 0.67 Fe 0.5 Mn 0.5 B 0.04 O 2 exhibits excellent cycling performance with 88.8% capacity retention after 100 cycles at 1 C and prominent rate performance. The structure-property relationship is constructed subsequently by neutron powder diffraction, in situ X-ray diffraction and X-ray absorption spectroscopy, which reveal that the Jahn–Teller distortion and the consequent P2-P2' phase transformation are effectively mitigated because of the occupancy of B 3+ at the interstitial site. Furthermore, it is found that the transition metal layers are stabilized and the transition metal dissolution are suppressed, resulting in excellent cycling performance. Besides, the prominent rate performance is attributed to the enhanced diffusion kinetics associated with the rearrangement of Na + . This work provides novel insight into the action mechanism of interstitial site doping and demonstrates a universal approach to improve the electrochemical properties of P2-type manganese-based sodium cathode materials.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yu Duan,Jia-xuan He,Zi-han Ma,Shu-wen Chen,Ying-ying Huang,Shuo Bao,Jin-lin Lu
Sodium-ion batteries (SIBs) are gaining traction for large-scale energy storage due to sodium's abundance and cost efficiency, yet the structural instability and slow ion transport of P2-type cathodes remain critical challenges. This study employs a high-temperature solid-state approach to develop K/Cu co-doped cathodes, demonstrating that co-doping preserves the P2 phase while optimizing lattice parameters to expand interlayer spacing. The reduction in Mn 3+ content suppresses the Jahn-Teller effect and mitigates P2-O2 phase transitions, enhancing structural reversibility. The optimal K 0.05 Na 0.7 Ni 0.23 Mn 0.67 Cu 0.1 O 2 exhibits a high initial discharge capacity of 123.8 mAh·g −1 at 20 mA·g −1 and maintains 96.80 % capacity after 200 cycles at 200 mA·g −1 , outperforming single K-doped samples (89.83 % retention). Kinetic analyses reveal a sodium-ion diffusion coefficient of 1.06 × 10 −10 cm 2 ·s −1 , attributed to enlarged interlayers and reduced charge transfer resistance. In-situ XRD confirms minimal (002) peak shift (0.42°) during cycling, validating structural stability from K + -pinned interlayers. DFT calculations indicate that Cu doping induces spin-polarized half-metallic behavior, enhancing electron conductivity by increasing density of states near the Fermi level. This work presents a “dual-functional co-doping” strategy in which K + stabilizes interlayers and Cu 2+ optimizes the electronic structure, thereby simultaneously suppressing phase transitions and enhancing ion/electron transport. The proposed approach provides a scalable route for developing high-performance SIBs cathodes, which is crucial for advancing affordable and durable energy storage solutions.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态化学
·
计算材料学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Jingyao Zeng,Lei Sun,Jinqiang Gao,Weishun Jian,Haoji Wang,Wenyuan Li,Ningyun Hong,Baichao Zhang,Jiangnan Huang,Bai Song,Wentao Deng,Guoqiang Zou,Hongshuai Hou,Xiaobo Ji
The integration of Mn in Na4Mn1.5Fe1.5(PO4)2P2O7 (NMFPP) enhances the energy density but compromises the Na+ mobility and structural stability due to limited electron hopping and pronounced Jahn–Teller effects. To address this, a structurally compatible anionic substitution strategy is implemented by partially replacing PO43– with bulkier and less electronegative SiO44– groups. The reinforced cathode exhibits enhanced rate performance, which is attributed to lattice expansion induced by the larger SiO44– units, thereby facilitating Na+ diffusion and reducing impedance during charge–discharge processes, as supported by GITT and DRT analyses. In addition, the improved cycling stability results from the lower electronegativity of Si, which enables SiO44– to accommodate local charge redistribution without triggering structural collapse, as evidenced by reduced lattice volume fluctuations observed in in situ XRD. Consequently, Na4Mn1.5Fe1.5(PO4)1.95(SiO4)0.05P2O7 achieves a capacity retention of up to 85.42% for 500 cycles at 1 C and 80.54% over 1500 cycles at 5 C. These findings highlight anion substitution as a promising strategy for optimizing polyanionic frameworks toward high-performance sodium-ion batteries.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Yingying Lei,Mingru Su,Shijie Wang,Jianchun Wu,Yu Zhou,Aichun Dou,Xueli Chen,Yunjian Liu
WNb12O33 with a ReO3 shear structure offers high lithium storage capacity but suffers from poor electron/ion transport. Hence, exploring an effective strategy aimed at enhancing intrinsic conductivity while maintaining a robust crystal framework is a significant challenge for advancing WNb12O33 as a promising anode. Here, a pseudo-Jahn–Teller effect-driven local structural distortion regulation strategy is demonstrated in WNb12O33 through quantifying Cu2+ occupancy at Nb sites in NbO6 octahedra. XRD results reveal the change in crystal structure symmetry. The DFT calculation confirms the alteration of the bandgap and Nb–O bond length, which not only exhibits enhanced electronic conductivity but also optimizes the adsorption behavior of Li+. Accordingly, the Cu2+-doped WNb12O33 offers a high reversible specific capacity of 272.6 mAh g–1, along with the Li+ diffusion coefficient promoted to 5.26 × 10–12 cm2 s–1. Moreover, it exhibits remarkable structural stability during the cycling process, featuring a reversible single-phase transition. As a result, Cu0.05WNb11.95O33 material provides high-rate capacity (147.2 mAh g–1 at 10 A g–1) and cycling performance (84.3% capacity retention at 5 A g–1 after 1000 cycles). This work provides a new perspective for the design and customization of shear structures and a basis for the rapid energy storage applications of WNb12O33.
研究领域:
材料科学
·
电化学
·
能量存储
·
固体物理
·
晶体化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Jiao Ma,Qin Zhu,Zhihui Qian,Wei Bai,Rui Liu,Long Shi,Yongsheng Yang,Yujiao Guo,Mingwu Xiang,Junming Guo
The drawbacks of Jahn-Teller (J-T) effect, capacity decay at high temperature and the dissolution of Mn generated at elevated current density limit the large-scale application of LiMn 2 O 4 batteries . Herein, a Si 4+ /Al 3+ co-doping strategy of LiMn 2 O 4 is carefully developed to stabilize the [MnO 6 ] framework, thereby inhibiting the J-T distortion and ultimately alleviating Mn dissolution. The incorporation of Si 4+ and Al 3+ in LiMn 2 O 4 promotes the formation of a single-crystal truncated octahedral structure, with preferential grain growth along the {111}, {100} and {110} crystal plane, which decreases Mn dissolution and enhances the Li + transfer pathways. Furthermore, the integration of Si 4+ /Al 3+ co-doping producing smaller particles can shorten the migration paths of electrons and ions. Consequently, the optimized LiSi 0.05 Al 0.09 Mn 1.86 O 4 displays a decent initial discharge specific capacity of 103.2 mAh·g −1 and an excellent capacity storage percentage of 79.7 % after 1000 cycles at 10 C. Meanwhile, the optimal sample also exhibits respectable first discharge capacities of 91.9 mAh·g −1 and 61.8 mAh·g −1 at ultra-high rates of 20 C and 40 C, along with superior capacity storage ratios of 70.9 % and 70.7 % after 1000 cycles. More importantly, the optimized sample shows remarkable first discharge specific capacity of 107.1 mAh·g −1 at 55 °C and 10 C and exciting capacity storage rate of 61.9 % after 500 cycles. This study serves as a guide for advancing high-performance, high-stability LiMn 2 O 4 cathode materials for use in lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
·
锂离子电池
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 19
·10625-10637
·
IF 14.511
Kun Wang,Xiaobing Huang,Tao Zhou,Dan Sun,Haiyan Wang,Zhi Zhang
The NASICON-type Na4MnV(PO4)3 (NMVP) possesses potential as a cathode material in SIBs, and is known for its stable 3D Na+ superconductive framework, high voltage platform, and relatively low cost and toxicity. Nevertheless, the intrinsic poor electronic conductivity and Jahn–Teller effect from Mn3+ during cycling limit its further application. Herein, to address such issues, a well-designed 3D porous spheroidal Ce3+-doped NMVP@CeO2/C cathode was constructed via a simple spraying drying-assisted route. As proved, the synergistic effect of Ce3+ doping in the crystal framework and CeO2 surface coating was achieved simultaneously, which greatly improved the electronic conductivity, facilitated the ion diffusion transfer and stabilized the crystalline structure. As a result, the as-prepared sample delivered superior discharge performance (50.3 mA h g−1 at 50C) and long circular life (91.0 mA h g−1 after 2000 cycles at 5C with 86.7% capacity retention). Furthermore, the reversible biphasic reaction for cathodes was confirmed by Galvanostatic intermittent titration technique (GITT) and ex situ XRD. The DFT calculation revealed the influence of Ce3+-doping on the crystalline framework and electrochemical properties. Finally, the optimized NMVP cathode also showed great potential for practical utilization through the successful assembly of full cells.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）