ADVANCED FUNCTIONAL MATERIALS
·
2016
·Vol. 26
·期 33
·6025-6032
·
IF 11.382
Yuyang Li,Guanghua Liu,Tengfei Cao,LiMin Liu,Jiangtao Li,Kexin Chen,Laifeng Li,Yemao Han,Min Zhou
Dense bulk samples of (Ag,In)-co-doped Cu 2 SnSe 3 have been prepared by a fast and one-step method of combustion synthesis, and their thermoelectric properties have been investigated from 323 to 823 K. The experimental results show that Ag-doping at Cu site remarkably enhances the Seebeck coefficient, reduces both electrical and thermal conductivities, and finally increases the figure of merit (ZT) value. The ZT of the Cu 1.85 Ag 0.15 SnSe 3 sample reaches 0.80 at 773 K, which is improved by about 70% compared with the unadulterated sample (ZT = 0.46 at 773 K). First principle calculation indicates that Ag-doping changes the electronic structure of Cu 2 SnSe 3 and results in larger effective mass of carriers, thus enhancing the Seebeck coefficient and reducing the electrical conductivity. The low electrical conductivity caused by Ag-doping can be repaired by accompanying In-doping at Sn site, and by (Ag,In)-co-doping the thermoelectric properties are further promoted. The (Ag,In)-co-doped sample of Cu 1.85 Ag 0.15 Sn 0.9 In 0.1 Se 3 shows the maximum ZT of 1.42 at 823 K, which is likely the best result for Cu 2 SnSe 3 -based materials up to now. This work indicates that co-doping may provide an effective solution to optimize the conflicting material properties for increasing ZT.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2012
·
IF 4.859
Mian Huang,Alexandre Dumon,Ce-Wen Nan
The doping effect of Si, In and Ge in Li 7 La 3 Zr 2 O 12 (LLZ) as the solid electrolyte was studied via conventional solid-state reaction. The crystal structure, cross-sectional morphology, element distribution and conductivity were characterized for the undoped and doped LLZ ceramics. Our results showed that Si and In doping deteriorate electrical properties of LLZ as electrolyte, while Ge doping obviously improves properties. Ge might thus be a promising element for further increasing the ionic conductivity of LLZ ceramics.
研究领域:
材料科学
·
固态离子学
✓ 已验证
DOI
高影响因子
VACUUM
·
2024
·
IF 3.8
Bian Zhentao,Ye Ziyan,Zhang Yiru,Ye Ru,Zhu Yanyan,Liu Chengcheng,Zhang Pinghua,Wang Hongyan,Chen Chong,Zhuo Xin,Zhang Keying
In this work, nitrogen, fluorine, and boron tri-doped flower-like porous carbons were prepared from sodium carboxymethyl starch (CMS) by using potassium hydroxide (KOH) as an activator and ammonium borofluoride (NH 4 FB 4 ) as a heteroatomic dopant. The specific surface area ( S BET ), total pore volume ( V t ), pore size distribution (PSD), heteroatom content and electrochemical performance of the samples were directly determined by the KOH content. The optimized material (CMS-F/B/N-4) showed a flower-like porous structure with a large S BET (666 m 2 g −1 ) and an appreciable amount of heteroatoms (oxygen: 8.01 at.%, nitrogen: 1.56 at.%, fluorine: 2.22 at.% and boron: 0.75 at.%). Owing to these merits, the supercapacitor based on CMS-F/B/N-4 displayed a maximum specific capacitance ( C g ) of 219.2 F g −1 at 1 A g −1 and a high performance, with more than 72.5% of initial capacitance was retained when the current density was increased from 1 to 10 A g −1 . In addition, a symmetric cell was assembled with a wide voltage range of 2.0 in 1 M Na 2 SO 4 aqueous electrolyte, delivering a relatively high energy density of 26.47 Wh kg −1 at 500 W kg −1 and stable performance of ∼99% retention after 10,000 cycles. This study demonstrated the feasibility of fabricating porous carbon with specific morphology and heteroatom doping from natural polysaccharide polymers. The findings indicate an avenue toward practical applications of carbon-based supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Huyan Shen,Fang Song,Yanyu Li,Hongjie Li,Yiyan Zhu,Shenming Zhu,Keryn Lian,Yao Li,Di Zhang
Pore structure modulation and heteroatom doping are two very important strategies for designing high performance porous carbon materials. Herein, we prepare nitrogen, oxygen and sulfur co-doped hierarchical porous carbon electrode by a scalable ZnO-KOH dual activation treatment of CMC-LS-urea aerogel (CMC: sodium carboxymethyl cellulose; LS: sodium lignosulfonate). The achieved porous carbon material possesses a high specific surface area (2898.2 m 2 g −1 ), hierarchical porous structure (V meso = 0.43 cm 3 g −1 , V micro = 0.93 cm 3 g −1 ) and rich heteroatom contents (O: 17.4 at%; N: 5.96 at% and S: 0.59 at%). The optimal sample demonstrates an exceptional specific capacitance of 342.5 F g −1 at the current density of 0.1 A g −1 and a high capacitance retention rate of 93.7 % after 30000 cycles in 6 M KOH electrolyte. Furthermore, the assembled symmetric capacitors exhibit a high energy density of 33 Wh kg −1 in 1 M TEABF 4 /AN organic electrolyte. This method also can be applied to other natural polymers precursors system for highly efficient and environmentally friendly energy storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2019
·
IF 4.197
Xuehui Liu,Jian Wu,Xingjia Guo
The oxygen evolution reaction (OER) is a key reaction in hydrogen production through water splitting and in fuel cells. Nickel nanoalloys are potential low-cost OER electrocatalysts, but their catalytic activity and stability need to be improved. The doping of nickel catalysts with anionic elements combined with partial amorphization can improve their electrocatalytic activity. In this study, we report a ternary B-, P- and O-doped amorphous nickel nanoalloy (BPO-Ni) as an effective electrocatalyst for the OER. Compared with binary boron–oxygen-doped nickel (BO-Ni) and phosphorus–oxygen-doped nickel (PO-Ni), ternary BPO-Ni has higher OER catalytic activity and better durability under alkaline conditions. Our results reveal that the high catalytic activity of the B-, P- and O-doped Ni nanoalloy is derived from the synergistic effects between the ternary heteroatoms and the Ni atoms, thereby increasing their catalytic activity. This work produces a new non-metal doped amorphous nickel nanoalloy structure, and offers a way of studying novel inexpensive and efficient OER catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lin-Chao Yang,Quan Zhou,Jin-Qiu Liu,Zhuo Wang,Yue-Chan Song,Wen-Wen Wu,Peng Liu
Extensive studies on TiO 2 -based colossal permittivity (CP, dielectric constant ε’ >10 3 ) materials have focused on the cation doping of metal elements; however, little attention has been paid to nonmetallic dopants. Compared to metallic elements, nonmetallic atoms with small radii and high activities, such as H, C, B, and N, can be used as anion-doping elements. Their incorporation into the TiO 2 lattice includes interstitial and substitutional doping, which can influence the bandgap of TiO 2 and its electron transport performance differently, thereby exhibiting considerable potential in TiO 2 -based applications. In this study, different N-containing compounds (BN and NH 4 Cl) were doped into rutile TiO 2 , while homogeneous ceramics of single-phase rutile TiO 2 were prepared via solid-state sintering. The effects of co-doping N, Cl, and N, B on the dielectric properties of rutile TiO 2 ceramics were investigated. While N and Cl doping showed no considerable effect on the dielectric properties of rutile TiO 2 ceramics, the co-doping of N and B doping in rutile TiO 2 considerably increased the dielectric constant to >10 4 with suppressed tan δ in a wide frequency range from 1 kHz to 10 MHz. These ceramics exhibited excellent frequency stability (up to 100 MHz) and temperature stability (153–513 K), which outperforms most reported transition metal co-doped TiO 2 ceramics, thereby highlighting the untapped potential of the non-metallic dopants in enhancing dielectric materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
APPLIED OPTICS
·
2017
·Vol. 56
·期 17
·4905-4910
·
IF 1.65
Yuan Cheng,Kangning Sun
Core-shell structured SiO2@YVO4:Yb3+, Er3+, Eu3+ nanospheres were prepared by a simple solgel method followed by a subsequent heat treatment. The as-prepared composites were characterized by a scanning electron microscope, high-resolution transmission electron microscope, x-ray diffraction, and photoluminescence spectra. The influences of different coating numbers were also studied. To sum up, the composites are spherical shaped with an average diameter of 200 nm, and the YVO4:Yb3+, Er3+, Eu3+ luminescent particles are successfully coated on the surface of SiO2 nanospheres. Under the near-infrared irradiation at 980 nm, the composites can emit strong green lights (at 525 nm, 550 nm) attributed to the H11/22→I15/24, S3/24→I15/24 transitions of Er3+ ions, and slight red lights (at 590 nm, 620 nm) attributed to the D05→F17, D05→F27 transitions of Eu3+ ions. Given the above, due to the regular core-shell structure, the uniform distribution of nanoparticles, and the colorful emissions, the SiO2@YVO4:Yb3+, Er3+, Eu3+ nanospheres may have great potential for some biological applications, such as biological tracers, bio-labeling, and so on.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JAPANESE JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 61
·期 6
·062002
·
IF 1.491
Lei Wang,Subiyinuer Jilili,Ayinuremu Tuerxun,Aierken Sidike,Qingling Wang
A series of Tb3+, Eu3+, Li+ co-doped SrSiO3 phosphors were prepared using the high-temperature solid-phase method. The X-ray diffraction results showed that Tb3+ and Eu3+ successfully entered into the SrSiO3 matrix lattice. Strong energy transfer from Tb3+ to Eu3+ is exhibited with a calculated energy transfer efficiency of 94.7%. Doping of the charge compensator Li+ increased the luminescence intensity of the SrSiO3:6%Tb3+, 6%Eu3+, 3%Li+ phosphor at a wavelength of 614 nm by 4.2 times and significantly improved the color purity of this phosphor (Cp = 85.9%). Based on color coordinate analysis, the phosphor color coordinates are located near (0.615, 0.365), which belongs to the red region. The phosphor was integrated into a white LED. The resultant package exhibited a color temperature of 6479 K and a color rendering index of 93.8. Its luminous performance was also very stable under different drive currents.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2018
·Vol. 12
·期 3
·346-357
·
IF 2.643
Zhang Chao,Lu Chenbao,Bi Shuai,Hou Yang,Zhang Fan,Cai Ming,He Yafei,Paasch Silvia,Feng Xinliang,Brunner Eike,Zhuang Xiaodong
Porous polymers have been recently recognized as one of the most important precursors for fabrication of heteroatom-doped porous carbons due to the intrinsic porous structure, easy available heteroatom-containing monomers and versatile polymerization methods. However, the heteroatom elements in as-produced porous carbons are quite relied on monomers. So far, the manipulating of heteroatom in porous polymer derived porous carbons are still very rare and challenge. In this work, a sulfur-enriched porous polymer, which was prepared from a diacetylene-linked porous polymer, was used as precursor to prepare S-doped and/or N-doped porous carbons under nitrogen and/or ammonia atmospheres. Remarkably, S content can sharply decrease from 36.3% to 0.05% after ammonia treatment. The N content and specific surface area of as-fabricated porous carbons can reach up to 1.32% and 1508 m 2 ∙g –1 , respectively. As the electrode materials for electrical double-layer capacitors, as-fabricated porous carbons exhibit high specific capacitance of up to 431.6 F∙g –1 at 5 mV∙s –1 and excellent cycling stability of 99.74% capacitance retention after 3000 cycles at 100 mV∙s –1 . Furthermore, as the electrochemical catalysts for oxygen reduction reaction, as-fabricated porous carbons presented ultralow half-wave-potential of 0.78 V versus RHE. This work not only offers a new strategy for manipulating S and N doping features for the porous carbons derived from S-containing porous polymers, but also paves the way for the structureperformance interrelationship study of heteroatoms codoped porous carbon for energy applications.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Nazir Ahmad,Nisar Muhammad,Hong Chen,Ji Wang,Chaohui Wei,Majid Khan,Ruizhi Yang
Developing improved anode materials is critical to the performance enhancement and the lifespan prolonging of sodium-ion batteries (SIBs). In this context, carbon-based nanostructures have emerged as a promising candidate. In this work, we have synthesized N, B, and P tri-doped carbon (NBPC) spheres using a one-step carbonization method. The as-prepared NBPC exhibits exceptional properties, including an expanded layer space, sufficient structural defects, and enhanced electrical conductivity . These characteristics synergistically contribute to the remarkable rate capability and ultra-long lifespan when NBPC is employed as an anode material for SIBs. The as-prepared NBPC demonstrates a reversible capacity of 290.6 mAh/g at 0.05 A/g, with a capacity retention of 98.4% after 800 cycles. Furthermore, NBPC exhibits an impressively ultra-long cycle life of 2400 cycles at 1.0 A/g with a reversible capacity of 140.2 mAh/g. First principle calculations confirm that the introduction of N, B, and P heteroatoms in carbon enhances the binding strength of sodium ions within NBPC. This work presents a novel approach for fabricating advanced anode materials, enabling the development of long-life SIBs for practical applications.
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
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 25
·45661-45668
·
IF 5.6
Yuyu Liu,Fan Zhang,Rui Zhu,Weijin Chen,Yue Zheng
It is well known that doping can significantly affect the dielectric and eletromechanical properties of perovskite ferroelectrics like BaTiO 3 . However, the influence of transition group element doping on the flexoelectric property of BaTiO 3 -based ceramics remains poorly studied. Here, we made a comparative investigation on the flexoelectric property of BaTiO 3 -based ceramics doped by transition group elements V, Mn and Ni. The phase composition, crystal structure, and average grain size of the ceramics were determined using X-ray diffraction refinement and scanning electron microscopy. It shows that the samples all exhibit dense and uniform microstructures with clear grain boundaries, but they have different average grain sizes ranging from 15 to 59 μm. Ceramics with larger average grain sizes exhibit higher dielectric constants and Curie temperatures. While the flexoelectric coefficient of Ni-doped, V-doped and pure BaTiO 3 ceramics varies from 15.36 μC/m to 60.37 μC/m, showing positive correlation with average grain sizes, that of the Mn doped BaTiO 3 ceramic which has the largest average grain size (59 μm) is rather small (19.01 μC/m). We suggest that the increased conductivity of ceramics suppresses the flexoelectric effect. The factors determining the flexoelectric coefficient of BaTiO 3 based ceramics doped by transition group elements should include electrical conductivity in addition to dielectric constant which is further affected by grain size. Our work gains new insight into the flexoelectric effect in perovskite oxide ceramics.
研究领域:
材料科学
·
功能陶瓷
·
铁电材料
·
凝聚态物理
·
电子显微学
·
介电学
·
固态化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·Vol. 21
·期 19
·2411490
·
IF 12.1
Yujia Zhang,Fuliang Guo,Ao Li,Zhixiong Li,Pengcheng Yuan,Jing Xu,Zhiwei Hu,Liang Yin,Huiling Zhao,Ying Bai,Hong Li
Heteroatoms doping would validly stabilize the structure of Li-rich material and elevate electrochemical performance. For the synthesized Li-rich material, the conventional ex situ doping strategy can only incorporate heteroatoms in the outer particles, diminishing benefits for the internal structure of secondary particles. Recently, in situ doping has been employed to influence topological lithiation and achieve well-distribution in the bulk structure. However, the mechanisms of in/ex situ doping on elevating electrochemical performance for Li-rich material are ambiguous. Herein, by introducing magnesium (Mg 2+ ) ions on the precursor and synthesized Li-rich material, the in situ Mg doping (LRO-Mg1) and the ex situ Mg doping (LRO-Mg2) samples are successfully designed. Characterizations shows that Mg ion tend to incorporate into the Li-rich bulk structure for in situ doping, while they enrich in the surface for ex situ doping. Electrochemical measurement manifest that the in situ Mg doping Li-rich cathode exhibits more elevated high-rate performance, while the ex situ doping Li-rich cathode exhibits more elevated specific capacity, illuminating that enhances bulk structure of Li-rich cathode through in situ doping strategy is more effective than the surface modification (ex situ doping). Ex situ doping may be more effective for surface treatment, contributing to specific capacity improvement.
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
危险品化学品经营许可证（带存储）