STAR Protocols
·
2023
·
IF 0
Bowen Jin,Yidong Ming,Jinguo Cao,Lizhi Ren,Hong Liu,Kai Wang,Congcong Wu
Summary The efficient functioning and stability of a perovskite photoactive layer are paramount to the performance of solar cell devices. Here, we present a protocol for the synthesis of a high-performance exemplified methylammonium lead iodide (CH 3 NH 3 PbI 3 or MAPbI 3 ) perovskite photoactive layer. We describe steps for preparing the requisite ratios of the precursor powders, synthesizing MAPbI 3 single crystals, and selecting a suitable preparation technique. We then detail a flexible doping strategy for the perovskite photoactive layer. For complete details on the use and execution of this protocol, please refer to Wang and Wu (2020, 2022, 2023). 1 , 2 , 3
研究领域:
材料科学
·
太阳能技术
✓ 已验证
DOI
PubMed
Batteries-Basel
·
2025
·Vol. 11
·期 3
·100
·
IF 4.8
Man Fang,Yutong Yao,Chao Pang,Xiehang Chen,Yutao Wei,Fan Zhou,Xiaokun Zhang,Yong Xiang
Doping lithium cobalt oxide (LiCoO2) cathode materials is an effective strategy for mitigating the detrimental phase transitions that occur at high voltages. A deep understanding of the relationships between cycle capacity and the design elements of doped LiCoO2is critical for overcoming the existing research limitations. The key lies in constructing a robust and interpretable mapping model between data and performance. In this study, we analyze the correlations between the features and cycle capacity of 158 different element-doped LiCoO2systems by using five advanced machine learning algorithms. First, we conducted a feature election to reduce model overfitting through a combined approach of mechanistic analysis and Pearson correlation analysis. Second, the experimental results revealed that RF and XGBoost are the two best-performing models for data fitting. Specifically, the RF and XGBoost models have the highest fitting performance for IC and EC prediction, with R2values of 0.8882 and 0.8318, respectively. Experiments focusing on ion electronegativity design verified the effectiveness of the optimal combined model. We demonstrate the benefits of machine learning models in uncovering the core elements of complex doped LiCoO2formulation design. Furthermore, these combined models can be employed to search for materials with superior electrochemical performance and processing conditions. In the future, we aim to develop more accurate and efficient machine learning algorithms to explore the microscopic mechanisms affecting doped layered oxide cathode material design, thereby establishing new paradigms for the research of high-performance cathode materials for lithium batteries.
研究领域:
材料科学
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电化学
·
数据科学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2020
·
IF 3.107
Xuefeng Shen,Qian Zhang,Tianxiang Ning,Jianlei Liu,Taoyong Liu,Zhiwei Luo,Yao He,Chunchun Qin,Anxian Lu
Garnet solid electrolyte is the most promising candidate among inorganic solid electrolytes due to its wide potential window, good compatibility and high safety. In this work, a dual doping strategy is offered for the development of garnet-type electrolytes with high ionic conductivity . Te 6+ is introduced into the Zr sites to stabilize the high-ionic conductivity cubic phase. Simultaneously, Sr 2+ enter the La sites to achieve a fine-tuning of the Li + concentration by charge compensation, acting as a sintering agent of Te 6+ /Sr 2+ doped electrolytes. The structure, chemical composition and ionic conductivity of Li 7 − 2 y + x La 3 − x Sr x Zr 2 − y Te y O 12 ( x = 0–0.25, and y = 0.35) electrolytes are systematically investigated by X-ray diffraction, Raman spectroscopy , scanning electron microscope , Energy Dispersive X-ray Spectroscopy, Inductively Coupled Plasma-Optical Emission Spectrometry and Alternating Current impedance. The results show that the optimal amount of Sr 2+ substitution helps to reduce the total resistance by promoting the growth of grains and ceramic densification . Among the investigated compositions, the composition with Li 6.425 La 2.875 Sr 0.125 Zr 1.65 Te 0.35 O 12 exhibits excellent performance with relative density of 97.95%, conductivity of 4.27 × 10 −4 S cm −1 at 25 °C and activation energy of 0.30 eV. The assembled Li/Li 6.425 La 2.875 Sr 0.125 Zr 1.65 Te 0.35 O 12 /Li symmetrical batteries are cycled galvanostatically under different current densities. The results show that the symmetrical battery can achieve good cyclic stability, good Li + stripping and plating process and low overpotential.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2025
·
IF 2.6
Xianchun Chen,Junjie Liu,Haoran Zhu,Longzhen Qiu,Xiaohong Wang
Flexible transparent electrodes (FTEs) have been widely used in the field of flexible optoelectronic devices due to their simultaneous conductivity and optical transmittance. However, traditional fabrication methods often struggle to achieve an optimal balance between high conductivity and flexibility, and may also involve high costs and complex processes. Consequently, developing a cost-effective strategy for the large-scale production of high-performance FTEs is crucial. Here, high-performance poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS) spray-coated FTEs were prepared by optimizing the PEDOT:PSS conductive ink formulation through doping strategies. The PEDOT:PSS FTEs exhibit a surface resistance of 70 Ω/sq and a transmittance of 80 % at 550 nm. Notably, their optoelectronic properties remain stable after 100 bends, continuous illumination at 2.43 mW/cm 2 , and exposure to 90 % relative humidity. In addition, large-scale FTEs (15 × 15 cm) were successfully produced using the spray-coating method and effectively implemented in flexible touch screens. These results show that optimized conductive ink formulations have great potential for the preparation of low-cost, large-area and uniform FTEs.
研究领域:
材料科学
·
柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2023
·
IF 9.4
Fangze Chen,Dacheng Zhou,Xueqing Xiong,Juntao Pan,Donglin Cai,Ze Wei,Xiyong Chen,Yihui Liu,Nengneng Luo,Jialin Yan,Toyohisa Fujita
A series of single-phase double perovskite Pr 1- x Gd x BaCo 2- y Fe y O 5+ δ ( x = 0, 0.5 and 1, 0 ≤ y ≤ 1) materials were engineered through A/B site co-doping strategy to improve the mechanical, electrical and electrochemical properties as potential cathode materials for the application of intermediate solid oxide fuel cells (IT-SOFCs). The corresponding thermochemical stability, thermal expansion behavior, electrical conductivity and cathodic polarization resistance of the materials were systematically investigated. It was found that the A-site dual lanthanide doped Pr 0.5 Gd 0.5 BaCo 2 O 5+ δ (PGBCO) exhibits improved electrical conductivity, reduced thermal expansion, and comparatively low electrochemical polarization resistance versus single lanthanide double perovskite, PrBaCo 2 O 5+ δ (PBCO) and GdBaCo 2 O 5+ δ (GBCO) materials. Further investigation on the effect of B-site Fe-doping on Pr 0.5 Gd 0.5 BaCo 2- y Fe y O 5+ δ (PGBCF- y , 0 ≤ y ≤ 1) reveals that all the PGBCF- y compositions exhibit excellent chemical stability with Gd-doped ceria (GDC) at operating temperatures not higher than 1 100 °C. Besides, doping of Fe in B-site can effectively reduce the thermal expansion coefficients (TECs) of the Pr 0.5 Gd 0.5 BaCo 2 O 5+ δ ceramics at 30–1 000 °C. And the electrochemical impedance spectra (EIS) results show that the PGBCF- y |GDC| PGBCF- y symmetric cells have acceptable low area specific polarization resistances. Further examination of the cathodic polarization and characteristic capacitance from the AC impedance spectra by employing the relaxation time distribution (DRT) method demonstrated that charge transfer is the dominating sub-process for the oxygen transport through the materials.
研究领域:
材料科学
·
燃料电池研究
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Y. He,S.W. Xin,Y.P. Lin,L.W. Kong,K.K. Wen,X. Shen,X.C. Cai,B.R. Sun,T.D. Shen
The preparation of bulk nanocrystalline (NC) tungsten alloys with excellent thermal stability and ultrahigh strength at elevated temperatures is a challenge. In this study, bulk NC W-3at%Y (W-3Y) with an average grain size of 16 ± 4 nm was successfully prepared via mechanical alloying and high-pressure/high-temperature sintering. The NC W-3Y alloy not only has ultrahigh Vickers hardness of 22.0 ± 0.3 GPa - which is close to the hardness of ceramic tungsten carbide, but also can maintain high hardness of 16.0 ± 0.2 GPa and a small grain size of 37 ± 12 nm after annealing at 1300 °C for 50 hours. The compressive strength of NC W-3Y at 900, 1000, and 1100 o C are as high as 1116, 571, and 345 MPa, respectively, much higher than those of previously reported tungsten and tungsten alloys. Doping Y into W increases the GB diffusion activation energy, lowers the GB diffusion coefficient and in turn the GB sliding rate, and thus increasing the strength at elevated temperatures. Partial alloying Y element segregated at grain boundaries (GBs) reduces the GB energy, leading to an excellent thermal stability, as revealed by our experimental observation and theoretical calculation. The utilization of high pressure has direct and indirect effects on lowering the grain growth rate of W-3Y during sintering: directly reducing diffusion coefficient, indirectly enhancing the plastic deformation, thus shortening the atomic diffusion distance required to fill the gaps between powder particles and leading to a lower sintering temperature.
研究领域:
材料科学
·
金属学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Jin Wang,Na Li,Xiao-Qin Yang,Li-Li Wang,Rui-Yao Ni
The host-guest doping strategy is widely used in the construction of room temperature phosphorescence (RTP) materials. The current methods for developing carbazole (Cz)-based RTP materials are mainly based on crystallization engineering. Herein, we report a general strategy for carbazole-based RTP materials by doping non-crystal benzoylcarbazole (BzCz) phosphor into polymer matrices . BzCz exhibited fluorescence in solution and RTP in powder state. Notably, the doped BzCz powder@PVA film displays yellow RTP emissions with an afterglow duration of around 7 s. Based on the theoretical calculations, it demonstrated that the co-assembly effect between the BzCz and PVA chains could enhance the long-lived RTP systems. This research provides great convenience for developing carbazole (Cz) molecule-doped polymer RTP materials under ambient conditions.
研究领域:
材料科学
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 6
·931
·
IF 3.9
Junling Wei,Li Xu,Lihua Hu,Tiejun Wang,Yufei Ma
Hydrogen evolution reaction (HER) is a topic of great interest due to its efficient hydrogen production properties, which can address the increasing demand for clean and sustainable energy sources. On the other hand, molybdenum carbide (MoC) has been widely studied due to its noble metal-like surface electronic properties. In the HER process, it is crucial to regulate the Mo−H bonding energy effectively and increase the electron transfer rate on the MoC catalyst surface in a rational manner. In this study, we introduce highly electronegative nitrogen and non-noble transition metal atoms (Cu or Co) into the molybdenum carbide crystal lattice (N−M−MoC, M: Cu, or Co), which leads to a dual—doping effect. This effect results in the rearrangement of the electronic configuration on the catalyst surface and the enrichment of electrons around Mo atom, leading to an optimization in the Mo−H bonding energy. Moreover, the unique two-dimensional nano-sheet structure of the N−M−MoC materials further promotes the electron transfer and exposure of active sites. Benefiting from the above, the HER performance of the N−M−MoC is significantly improved. Among them, N−Cu−MoC exhibits the lowest overpotential (η10= 158 mV) and highest stability (about 30 h) in alkaline solutions.Keywords:dual-doping;heteroatoms;molybdenum carbide;hydrogen evolution reaction;surface electronic structure
研究领域:
材料科学
·
催化化学
·
能源科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shuai Zhang,Hong Ming,Konglan Chen,Yuanjing Wang,Chuang Zhang,Yayun Zhou,Tingting Deng,Puxian Xiong
Mn 4+ -doped fluoride red-emitting materials are renowned for their distinct characteristics, including fixed emission peaks and narrow spectral emission, rendering them highly favored in photoluminescent light-emitting diodes (LEDs). However, achieving ultra-high-concentration Mn 4+ doping in fluoride phosphors is imperative to enhance quantum efficiency. Nevertheless, attaining such doping levels in metastable compound systems poses considerable challenges. In this study, we introduce an innovative reverse doping strategy, leading to the synthesis of Mn 4+ -doped cubic K 2 SiF 6 phosphor (11.38 mol %) from hexagonal K 2 MnF 6 . Remarkably, this approach significantly improves the external quantum efficiency (EQE) to 66.7 % upon 450 nm excitation. Through systematic comparisons with conventional co-precipitation and ion exchange methods, our findings unequivocally demonstrate the superior efficacy of this approach in achieving high-concentration Mn 4+ ion doping within relatively insoluble matrices. The successful application of our optimized phosphor enabled the fabrication of a red light-emitting diode (LED) that exhibits an exceptional photoelectric efficiency of 31.67 % at 350 mA, surpassing the performance of a commercial red LED chip. Furthermore, the stable red-light emission from the phosphor-converted LED (pc-LED) proves instrumental in rapid-response vascular imaging, showcasing the potential of our findings in advancing light sources for biological detection applications. This research provides valuable insights into enhancing red emission efficiency in slightly-soluble fluoride phosphors via novel synthetic strategy, unlocking possibilities for the development of highly efficient light sources in biological detection and imaging applications.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
DOI
高影响因子
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
·
2023
·Vol. 62
·期 50
·e202315911
·
IF 16.6
Weiguo Qiao,Ming Yao,Jingwen Xu,Haiyan Peng,Jianlong Xia,Xiaolin Xie,Zhong'an Li
Graphical The origin of yellow-green room temperature phosphorescence (RTP) of triphenylamine from commercial sources has been clarified for the first time, which inspires a general and convenient approach to construct bicomponent host/guest organic RTP materials, that is, doping naphthyl substituted analogues into the host molecule. Accidentally, it was found that triphenylamine (TPA) from commercial sources shows ultralong yellow-green room temperature phosphorescence (RTP) like commercial carbazole, which however disappears for lab-synthesized TPA with high purity. Herein, we for the first time identify the impurity types that cause RTP of commercial TPA, which are two N , N -diphenyl-naphthylamine isomers. Due to similar molecular polarity and very trace amount (≈0.8 ‰, molar ratio), these naphthyl substituted impurities can be easily overlooked. We further show that even at an extremely low amount (1000000 : 1, mass ratio) of impurities, RTP emission is still generated, attributed to the triplet-to-triplet energy transfer mechanism. Notably, this doping strategy is also applicable to the triphenylphosphine and benzophenone host systems, of which strong RTP emission can be activated by simply doping the corresponding naphthyl substituted analogues into them. This work therefore provides a general and efficient host/guest strategy toward high performance and diverse organic RTP materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wanhang Li,Rui Hu,Xusheng Wang,Yanxia Li,Xi Yao
Rare earth-doped persistent luminescent (PersL) phosphors are excellent candidates for anticounterfeiting due to their superior properties, including various luminescent colors, multifarious luminescent modes, and dynamic emission intensity. For classical PersL phosphors, single-doped phosphor always shows monotonous luminescent color in different emission modes, such as photoluminescence (PL) and PersL, which limits the anticounterfeiting level to a low degree. To optimize the optical properties of phosphors for anticounterfeiting applications, constructing multiactivator-doped phosphors with polychromatic luminescence emissions can be a feasible strategy in practical material development. In this study, a novel multicolor PersL material , Pr 3+ /Tb 3+ -doped LiTa 3 O 8 , was reported for the first time, where the PersL color of Pr 3+ in LiTa 3 O 8 host was red whereas terbium(III) (Tb 3+ ) ions exhibited green PersL color. Two improvement strategies were implemented, including substitution of tin(IV) (Sn 4+ ) and codoping with gadolinium(III) (Gd 3+ ), to enhance PersL properties by regulating distribution of traps. Gd 3+ codoping strategy effectively improved PersL intensity while the Sn substitution strategy increased the initial PersL intensity by four-fold and the duration prolonged by 2.5-fold. Based on the results of luminescent properties, a multicolor tunable PersL material, LiTa 3 O 8 :0.7 %Pr 3+ 1 % Tb 3+ , was synthesized and conceptually designed into a multimode anticounterfeiting application. Based on this scheme, prototype anticounterfeiting devices were developed, which could display the anticounterfeiting patterns in both dynamic and static states. Thus, this study fabricated a novel PersL material with multicolor light in different luminescent modes, thus deepening the fundamental understanding of PersL materials and diversifying the potential candidates of optical anticounterfeiting materials.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xinping Hou,Kai Wang,Jun Wang,Jianhua Yang,Guixin Dong,Shaomin Liu
Piezocatalysis has emerged as a sustainable alternative for hydrogen peroxide production. However, the current development of efficient piezocatalysts is predominantly focusing on those conventional piezoelectric ceramic oxides with high permittivity and limited catalytic activities. Therefore, innovative approaches to develop novel piezocatalysts in particular from these outstanding paraelectric semiconductors are highly required. In this work, by employing a feasible doping strategy, robust piezoelectric property is created on the Ba 2 Nb 2-x Fe x O 6-δ double perovskite oxides, typically characterized by a stable paraelectric cubic structure. Optimum Fe doping not only intensifies the double perovskite phase but also inspires a phase transition from a centrosymmetric cubic to a piezoelectric tetragonal phase, thereby achieving desirable piezoelectricity and enabling a series of favorable physical properties including redox activity, active sites of anion defects, reduced bandgap, and increased free charge density. All these are important factors to enhance piezocatalytic activity. As a result, Ba 2 NbFeO 6-δ achieved by the optimum Fe doping demonstrated exceptional piezocatalytic H 2 O 2 yield of 512 and 690 µmol g -1 h −1 under atmosphere and oxygen-purging conditions, respectively, without the presence of any sacrificial agents. Mechanistic investigations reveal that both water oxidation and oxygen reduction involve in the H 2 O 2 production, wherein piezopotential plays a critical role not only in facilitating the charge carrier separation and transportation but also in modulating the band structure to enhance the catalyst redox capacity. This study offers a feasible and universal strategy for the design of novel piezocatalysts, expanding the windows for catalyst selection for piezocatalysis.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）