Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Xiaoying Bo,Caijie Yang,Bolun Li,Yikang Fan,Jiaoyan Li,Hengming Huang,Jiahui Kou,Chunhua Lu
The photocatalytic O2 reduction to produce H2O2 offers significant environmental benefits. However, its efficiency is hindered by rapid charge recombination and sluggish catalytic kinetics in the catalyst. Traditional elemental doping has been employed to mitigate these issues, but its efficacy is limited as heteroatoms within the bulk often trap charge carriers. To address these challenges, we propose a gradient doping strategy. Unlike uniform doping, gradient doping introduces additional active sites on the catalyst surface. Our engineered gradient Mn-doped CdS photocatalyst demonstrated a remarkable H2O2 generation rate of 1874 μmol g−1 h−1, with an apparent quantum efficiency of 65.2% at 475 nm. The gradient distribution of Mn creates reverse quantum wells within the CdS matrix, which significantly enhances charge extraction from the bulk to the surface. The surface enrichment of Mn not only facilitates the adsorption and activation of O2 but also promotes the formation of the crucial *OOH intermediate, thereby accelerating H2O2 production.
研究领域:
材料科学
·
环境科学
·
催化化学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Cong Wei,Jian Kang,Cen Shao,Pengfei Sang,Tianyuan Zhou,Mingzhou Li,Fan Qiu,Baolin Jiang,Rongyu Xu,Wieslaw Strek,Hao Chen,Zhiru Ren,Le Zhang
The key to realizing the applications of ceramic based laser lighting devices depends on the heat management capability of color converters. In order to sufficiently absorb the blue light and smoothen the temperature gradient of luminescent ceramics, multistage gradient doping Ce 3+ :Y 3 Al 5 O 12 (Ce:YAG) transparent ceramics (TCs) with five different concentrations were designed, including 0.01 at%, 0.05 at%, 0.1 at%, 0.2 at% and 0.4 at% Ce. The composite green bodies were prepared by aqueous tape casting and multistage gradient doping Ce:YAG TCs, with concentrations from low to high, were fabricated by vacuum sintering. The in-line transmission values at 800 nm of composite structure Ce:YAG TCs could reach 80.3%. Under 21.13 W/mm 2 blue laser excitation, the gradient doping Ce:YAG TC (1.32 mm) realized a high luminous efficacy of 280.3 lm/W, which was 15.8% higher than that of 0.15 at% Ce:YAG TC (240.27 lm/W). Finally, during lighting process, the input-output temperature differences (T in -T out ) between excitation surface and light-exit surface of 0.15 at% Ce:YAG TC was 5 ℃, while that in gradient doping TC reduced by 50% (2.5 ℃). The results indicate that the multistage gradient doping Ce:YAG TCs will be an interesting color converter for high-power and energy-saving laser-driven lighting.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2025
·
IF 7.9
Yuhan Yang,Haohao Ji,Mengmeng Xie,Dewen Wang,Wenhao Zhou,Jian Zhang,Yu Liu,Shiwei Wang,Zheng Wang
Gradient doping of Nd: YAG (Nd: Y 3 Al 5 O 12 ) can relieve thermal effect during laser operation in solid-state lasers. Direct ink writing (DIW) is an effective method for fabricating gradient-doped structures. However, the delay issue during component switching significantly affects rare-earth ion concentration distribution in the samples, which includes delivery delay and transitional delay. They were respectively optimised by reducing the volume of mixing zone and by modifying component switching mode. Firstly, simulations of the mixing zone before and after optimisation were conducted using ANSYS Fluent to demonstrate the mixing uniformity. Secondly, the processes of component changes during extrusion were simulated to demonstrate the effectiveness of the two delay optimisation methods. Line patterns were printed using DIW with varying mixing zone volumes and component switching modes. The delay optimisation methods were confirmed to significantly reduce the impact of the delay by measuring Nd 3+ ion concentration. Furthermore, a mathematical model was developed to assess the influence of two delay optimisation methods on the delay. Finally, 0–0.5–1–0 at% Nd: YAG gradient-doped laser ceramics were successfully fabricated based on the proposed delay optimisation method, and the performance characterization of the Nd: YAG laser ceramics confirmed the efficacy of the method.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
Energy Storage Materials
·
2023
·
IF 20.4
Zewu Xie,Shaofeng Liu,Canhong Wu,Ruiyi Cai,Na Li,Shaoming Huang
Vanadium-based materials are expected to achieve high-rate capability with high energy density in Zn-ion batteries (ZIBs) due to the layered-structure and multi-electron redox mechanism. However, the high-rate charge/discharge capacity is usually restricted by limited charge storage active sites on material surface and poor electrode kinetics. Herein, homo-interfaces and built-in electric fields were constructed to boost the Zn 2+ diffusion and electron transmission kinetics of NaV 8 O 20 ·xH 2 O (NaVO) nanoflake cathodes, respectively, which cooperated to achieve high-rate charge/discharge capacity in ZIBs. Specifically, firstly, homo-interfacial NaVO nanoflakes were prepared, and then gradient N-doping was introduced from homo-interface to surface of NaVO due to the lower N-doping formation energies of interface than that of surface, which improved electrical conductivity and formed a build-in field to accelerate electron transmission; Moreover, there is a large difference between Zn 2+ concentration in homo-interfaces and surfaces of the N-doped NaVO as the homo-interfaces with lower zinc adsorption energy are more conducive to the adsorption and aggregation of Zn 2+ than that of the surface, which boost Zn 2+ diffusion; Furthermore, numerous micropores were created to shorten ion transport pathways. These structural advantages enabled ultra-fast Zn-storage kinetics and excellent cycling performance of NaV 8 O 20 ·xH 2 O in ZIBs, the reversible capacity can reach 417 mA h g −1 at 0.1 A g −1 , and as high as ∼110 mA h g −1 at 100 A g −1 with capacity retention of 68.4% after 50,000 cycles. Dynamic analysis verifie that high capacitive capacity contributes most to the excellent performance, which can be ascribed to the structural advantages described above. The findings of this study provide new insights for designing Zn-ion storage materials with high-rate capability and long life.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Xin-Yu Kang,Zhi-Hao Zhao,Yu-Kai Lv,Yejing Dai
The large temperature dependence of electro-strain for Bi 0.5 Na 0.5 TiO 3 (BNT)-based ceramics limits their practical applications. In this work, Li-doped BNT-based lead-free multi-layer piezoelectric ceramic actuators are prepared by solid-state reaction synthesis method. The multi-layer actuator structure is fabricated by gradient doping, in which each layer corresponds to different compositions, with enhanced temperature stability compared to the single-layer one. For specific composition, it could achieve maximum electro-strain value at a certain temperature. Therefore, the electro-strain of each layer in this BNT-based multi-layer actuator could compensate each other at different temperatures with improved temperature stability. Consequently, the electro-strain of the five-layer structure varies less than ∼12% when the temperature changes from 50 °C to 130 °C, and a large electro-strain of 600 pm/V could be obtained at 70 °C. This work provides an effective approach by gradient doping to broaden the use temperature range for BNT-based actuators with improved temperature stability.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Jiaqi Huang,Xinglin Tang,Yuqi Zhou,Ting Wang,Fangzhou Zhao,Weijian Wang,Yan Meng,Wanglai Cen,Yongzhi Zhang
The practical application of manganese-rich lithium manganese iron phosphate, i.e., LiMn0.8Fe0.2PO4, is limited by poor cycling stability and severe voltage decay. In this study, a novel and facile Zn-gradient doping strategy has been employed to enhance the structural stability and lithium-ion de-intercalation kinetics, thereby suppressing the voltage decay of LiMn0.8Fe0.2PO4/C (LMFP/C). Compared to the pristine LMFP/C, the Zn-gradient doped LiMn0.8Fe0.2PO4/C (Zn-LMFP/C) exhibits significantly enhanced cycling stability with the capacity retention increasing from 64.11% to 97.47% and suppressed voltage decay with the energy retention increasing from 60.75% to 96.06% after 300 cycles at 1C. Furthermore, the reversible capacity of Zn-LMFP/C is 157.21 mA h g−1 at 0.1C and 138.88 mA h g−1 at 5C, much higher than those of most of the Mn-rich LMFP/C materials reported in previous literature. Cyclic voltammetry (CV) and Galvanostatic Intermittent Titration Technique (GITT) results show that the delithiation/lithiation kinetics of Zn-LMFP/C are notably enhanced. Further first-principles calculations confirm that Zn-LMFP/C possesses superior structural stability and lithium-ion diffusion kinetics. These findings underscore the effectiveness of gradient doping in improving the electrochemical stability of LMFP, providing a promising strategy to mitigate voltage decay and enhance the long-term performance of high-capacity cathode materials for lithium-ion batteries.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Lin Xu,Ming Chen,Guohu Chen,Hongli Wu,Wenwei Wu,Xuehang Wu
As a high-capacity, high-voltage, and low-cost cathode material for sodium-ion batteries (SIBs), Na/Mn-based hexacyanoferrates (Na x Mn[Fe(CN) 6 ] 1−y ·□ y ·nH 2 O) typically exhibit poor structural reversibility and interfacial stability during cycling. In this study, we report the in-situ construction of a triphasic intergrowth Na/Mn/Zn-based hexacyanoferrate (mcr-Zn 0.2 Mn 0.8 ) with concentration-gradient Zn distribution by an anion-controlled fractional precipitation route. Density functional theory calculations verify that the unique heterostructure arises from the different binding energies between cations and anions. A small amount of Zn 2+ doping in the inner cubic/monoclinic phases enhances their structural reversibility during cycling by impeding lattice deformation induced by the Jahn–Teller effect of Mn 3+ . Meanwhile, the rhombohedral Zn-based hexacyanoferrate epitaxially grown on the surface diminishes the particle size of mcr-Zn 0.2 Mn 0.8 resulting in short Na + diffusion distance, and provides interface protection that suppresses detrimental electrolyte decomposition. Consequently, mcr-Zn 0.2 Mn 0.8 exhibits a high discharge capacity of 121.1 mAh/g at 15 mA g −1 , improved cycling stability at 750 mA g −1 with a capacity retention of 65.0 % after 2000 cycles, and enhanced rate capability with a discharge capacity of 71.4 mAh/g at 6000 mA g −1 . The successful implementation of simultaneous surface and bulk modifications through a one-step reaction opens new possibilities for developing high-performance hexacyanoferrate cathode materials for SIBs.
研究领域:
材料科学
·
电化学
·
能源存储
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Mingyang Li,Fangyuan Bai,Qi Yao,Hecheng Wang,Peng Li
Lithium cobalt oxide (LCO), as a popular commercial material, can release higher capacity by increasing the charging voltage. However, deep delithiation leads to the dissolution of elements and structural disorder. Meanwhile, high-temperature performance is still in urgent need to be improved in practical application. Here, we use LiNO 3 , NaF and H 3 BO 3 as raw materials to construct the outer LiF-rich layer and the inner B, F gradient doped hierarchical nanostructures through stirring and calcination . The electrochemically stable LiF-rich surface helps to form a favorable cathode electrolyte interphase (CEI) layer to prevent electrolyte penetration. The gradient doping of B and F in the subsurface region increases the stability of the lattice at high temperature and high potential. The unique structure enables treated LCO to demonstrate stable cycling under high voltage (4.6 V) with a capacity retention of 93.2% after 800 cycles and displayed 95.2% retention for 100 cycles under high temperature (45 °C). The postmortem analyses after long cycles prove the strategy of surface modification helps to protect the structure and reduce adverse reactions. This study provides a simple and extendable method for improving the cycling stability of cathodes at high temperature and high voltage.
研究领域:
材料科学
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电化学
·
能源存储
·
锂离子电池
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固态化学
·
纳米结构
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DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Bin He,Yujie Dai,Shuai Jiang,Dawei Chen,Xilong Wang,Jie Song,Dan Xiao,Qian Zhao,Yan Meng,Wei Feng
Oxygen release and electrolyte decomposition under high voltage endlessly exacerbate interfacial ramifications and structural degradation of high energy-density Li-rich layered oxide (LLO), leading to voltage and capacity fading. Herein, the dual-strategy of Cr x B complex coating and local gradient doping is simultaneously achieved on LLO surface by a one-step wet chemical reaction at room temperature. Density functional theory (DFT) calculations prove that stable B–O and Cr–O bonds through the local gradient doping can significantly reduce the high-energy O 2 p states of interfacial lattice O, which is also effective for the near-surface lattice O, thus greatly stabilizing the LLO surface. Besides, differential electrochemical mass spectrometry (DEMS) indicates that the Cr x B complex coating can adequately inhibit oxygen release and prevents the migration or dissolution of transition metal ions, including allowing speedy Li + migration. The voltage and capacity fading of the modified cathode (LLO-CrB) are adequately suppressed, which are benefited from the uniformly dense cathode electrolyte interface (CEI) composed of balanced organic/inorganic composition. Therefore, the specific capacity of LLO-CrB after 200 cycles at 1C is 209.3 mA h g −1 (with a retention rate of 95.1%). This dual-strategy through a one-step wet chemical reaction is expected to be applied in the design and development of other anionic redox cathode materials.
研究领域:
材料科学
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电化学
·
能源存储
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产品关联
DOI
高影响因子
Tungsten
·
2025
·
IF 11.2
Zhou Jie,Zhang Yu-Hang,Mao Qin-Zhong,Xu Xing,Reng Zi-Rui,Yao Zhu-Jun,Xia Yang,Lu Xiao-Xiao
Ultra-high Ni layered cathodes are considered leading candidates for next-generation lithium-ion batteries due to their high energy density. However, their practical application is hindered by structural instability, rapid capacity degradation, and sluggish lithium-ion kinetics. To overcome these challenges, a synergistic modification strategy combining gradient Nb doping with in situ formation of a LiNbO 3 surface layer is proposed. The radially distributed Nb dopant effectively mitigates internal lattice strain and suppresses the formation of microcracks, while the LiNbO 3 coating enhances interfacial stability and facilitates Li-ion transport. As a result, the optimized sample (0.5%Nb-NCM) delivers a high specific capacity of 222.2 mAh·g −1 at 0.1C, retains 94.7% of its capacity after 200 cycles at 1C, and achieves 147.7 mAh·g −1 at an ultra-high rate of 20C. This work highlights the effectiveness of combining compositional and interfacial engineering to develop structurally robust and electrochemically stable ultrahigh-Ni cathodes for advanced Li-ion battery applications. Graphical abstract
研究领域:
电化学
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材料科学
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能源存储
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锂离子电池
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界面工程
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结构稳定性
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Ruifeng Wang,Jiabao Bai,Zhengtao Qiu,Yelin Ding,Chun Sun
Hydrogen peroxide (H 2 O 2 ) is a versatile green oxidant with wide-ranging applications. In this study, a bismuth ion (Bi 3+ )-gradient-doped indium sulfide (In 2 S 3 ) photocatalyst with abundant sulfur vacancies (V s ) was successfully prepared via a polyvinylpyrrolidone (PVP)-assisted hydrothermal method combined with solid-state grinding. The synergy of Bi 3+ doping and V s narrows the bandgap and constructs a built-in electric field for directional carrier transport, enabling the catalyst to achieve a H 2 O 2 production rate of 784.35 μmol g −1 h −1 under visible light (λ ≥ 420 nm). This work establishes a novel paradigm for designing high-performance sulfide photocatalysts.
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产品关联
DOI
高影响因子
Advanced Energy Materials
·
2023
·Vol. 14
·期 7
·2302761
·
IF 27.8
Jian Zhou,Chunxian Xing,Jiawei Huang,Yucheng Zhang,Guowei Li,Long Chen,Shuqiang Tao,Zhuoli Yang,Guangren Wang,Linfeng Fei
Lithium-ion batteries (LIBs) with LiFePO 4 (LFP) cathode materials have occupied a significant market share in state-of-the-art power storage systems and electric vehicles, yet the approaching “retiring wave” of these LIBs should be appropriately treated (i.e., recycling of spent LIBs). Current recycling strategies of degraded LFP materials largely direct on leaching of lithium elements, leaving the leached FePO 4 residual as a waste. Inspiringly, LiMn x Fe 1− x PO 4 material is considered one of the potential candidates for next-generation cathode materials because of its high electrochemical performance, extraordinary stability, and low cost. Herein, the direct upcycling of leached FePO 4 toward LiMn 0.25 Fe 0.75 PO 4 (LMFP) cathode material is demonstrated via a green, simple, and scalable mechanochemical pathway. The product features a gradient-doping of Mn, as well as a uniform carbon coating for LMFP particles. As a result, the LMFP cathode material delivers superior electrochemical performance; the capacity (161.3 mA h g −1 at 0.1 C), rate capability (90.1 mA h g −1 at 5 C), cycling stability (95.6% capacity retention after 800 cycles at 1 C), and energy density (≈15% increase as compared to LFP) are almost comparable with those of fresh materials. The as-established upcycling protocol offers a favorable reuse method for leached FePO 4 materials.
研究领域:
材料科学
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储能技术
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可持续化学
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电池回收
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电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）