CRYSTENGCOMM
·
2021
·Vol. 23
·期 26
·4694-4699
·
IF 3.545
Xiancheng Meng,Chao Fan,Xia An,Shuo Yuan,Yongkai Jing,Zhe Liu,Chun Sun,Yonghui Zhang,Zihui Zhang,Mengjun Wang,Hongxing Zheng,Erping Li
Tin disulfide has attracted enormous interest due to its excellent optical and electronic properties for future optoelectronic applications, especially high-performance photodetectors. Nevertheless, SnS2-based photodetectors still face great challenges for practical applications, such as low responsivity and slow response speed. Herein, the enhanced photoresponse characteristics of aluminum (Al)-doped SnS2 nanosheets were investigated. Al-doped SnS2 nanosheets were synthesized by using a convenient and high-yield hydrothermal technique, and high purity and high crystallinity were confirmed by SEM, XRD, Raman spectroscopy, XPS, and TEM. Al atoms were homogeneously introduced into SnS2 nanosheets, leading to a slight increase in lateral size from 185.4 nm to 196.9 nm and thickness from 13.5 nm to 17.9 nm. Then, photodetectors based on Al-doped SnS2 nanosheets were built and characterized. Compared to pristine SnS2, the photoresponse performance of the Al-doped SnS2 nanosheets was significantly improved. In particular, the response time was reduced by nearly two orders of magnitude from 1040 ms to 51 ms. The responsivity was increased one hundredfold, from 0.79 mA W−1 to 15.16 mA W−1. The photoresponse characteristics are prominently enhanced due to Al-doping induced band gap narrowing. Our findings provide an effective approach to improve the photoresponse performance of SnS2 and pave the way for further optoelectronic applications of SnS2.
研究领域:
材料科学
·
纳米科技
·
光电子学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Si Li,Dakui Zhao,Huili Wang,Yu Zhang,Wenjiang Huang,Ying Zhou
The valence electron structure (VES) of MoSi 2 -based solid solution alloys was studied herein by the bond length difference (BLD) method based on the empirical electron theory (EET) of solids and molecules and the average atomic model. Compared to those for a MoSi 2 alloyed with Al or Mg separately, alloying with Mg + Al together significantly decreased the bond energy of the main bond branch and the ratio of the number of covalent valence electrons to the total number of valence electrons in the Mo(Si 0.92 Al x Mg 0.08- x ) 2 solid solutions and increased the lattice electrons. Thus, alloying MoSi 2 with Mg + Al together reduced the hardness and strength of MoSi 2 and increased its fracture toughness above what occurred when Mg or Al were added separately. The combined impact of the impurities was especially noticeable when MoSi 2 was alloyed with 4 at% Mg+4 at% Al. Based on those results, Mo(Si 0.92 Al x Mg 0.08- x ) 2 solid solution alloys were made, their mechanical properties were tested, and the experimental results were consistent with those of the theory.
研究领域:
材料科学
·
固体力学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Guotai Zhang,Jingze Zhang,Yuan Zhou,Guicai Qi,Yongmin Wu,Chunxi Hai,Weiping Tang
Al-doped lithium manganese oxides Li 1.6 Al x Mn 1.6- x O 4 were successfully prepared by sol–gel synthesis and solid state reactions . Protonated samples were obtained by further acid treatment. Experiments were performed to study the effects of physical properties including the Al 3+ doping content x and calcination temperature for optimizing the synthesis of H 1.6 Al x Mn 1.6-x O 4 ion-sieve pursing nice performance such as enlarging the adsorption capacity and minimizing dissolution loss of manganese. The characteristics of a series of Al-doped ion-sieve were studied by XRD , SEM and EDS . The crystal structure was kept well after Al doping from XRD analysis. SEM and EDS showed that Al was uniformly distributed in the sample. The valence state of Mn in Al-doped ion-sieve precursor was analyzed by XPS . Adsorption/desorption experiments were carried out to evaluate the amounts of lithium extraction, lithium adsorption capacity and the manganese and aluminum dissolution loss of the ion-sieve. The results showed that the Al-doped H 1.6 Mn 1.6 O 4 ion-sieve exhibited higher absorption capacity (which approached 32.6 mg g −1 while the undoped one reached only 27.6 mg g −1 ). Furthermore, the dissolution loss of manganese and aluminum from the Al-doped ion-sieve were the most impressive among the ones. Importantly, the Al-doped ion-sieve still preserve a high adsorption capacity (26.8 mg g −1 ) and pretty low manganese dissolution loss (1.92%) after performing up to 4 cycles of adsorption/desorption experiments, indicating an enhanced stability of the Al-doped H 1.6 Mn 1.6 O 4 ion-sieve.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Junming Shao,Zhicheng Li,Yuan Zeng,Shiyuan Chen,Lin Yang,Hong Zhang
Taking into account of high energy density and safety, solid-state lithium-ion batteries (LIBs) are promising for next-generation energy storage devices and high-performance power sources, and the inorganic solid electrolyte is a key component in LIBs. Here, a new system of solid oxide electrolyte with a nominal composition of Li 29 Zr 9 Nb 3 O 40 (LZNO) and Al-doped LZNO are prepared through a sol-gel method and the related ionic conductivities are firstly investigated. All the prepared compounds have an orthorhombic structure. The pure LZNO shows a bulk conductivity of 1.75 × 10 −4 S cm −1 and a total conductivity of 5.90 × 10 −5 S cm −1 at 25 °C, and has low activation energy of conduction of 0.20 eV. The Al-doping enhances the total ionic conductivity up to 2.41 × 10 −4 S cm −1 at room temperature. The computational simulation by using bond valence site energy reveals that the LZNO crystal has 3D migration pathways including two-dimensional migration pathways along a - and c - orientations, as well as the migration b -direction one provided by the partially occupied O (8) sites.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Ce Zhang,Yunchuan Qi,Shengtang Liu,Yi Men,Fangming Cui
A kind of mesoporous Al-doped TiO 2 with high specific surface area (223.4–336.0 m 2 g −1 ) was prepared by a simple sol-gel process and presented an improved lithium storage performance compared with that of the mesoporous TiO 2 . The alcoholysis and condensation of AlCl 3 in ethanol introduced/doped the Al 3+ ions into the anatase lattice, which stabilized the anatase nanocrystals and introduced oxygen vacancies in the materials, giving an improved specific surface area and reduced impedance of the material and electrode.
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
Science China-Materials
·
2022
·Vol. 65
·期 12
·3452-3461
·
IF 8.64
Yang Lin,Yu Jinxing,Chang Shufang,Xu Xiaoxiang
LaTaON 2 is an attractive visible-light-active photocatalyst for water splitting due to its broad visible light absorption as far as 650 nm and proper band edge positions. Notwithstanding these promising properties, LaTaON 2 generally exhibits poor photocatalytic activity because of its high defect concentration that severely hinders charge separation. Here, LaTaON 2 has been modified by doping Al into the Ta sublattice, i.e., LaTa 1− x Al x O 1− y N 2− y (0 ≤ x ≤ 0.20). Al doping not only inhibits the defect concentration and increases surface hydrophilicity but also maintains the desired visible light absorption of LaTaON 2 . These important modifications substantially ameliorate the charge separation conditions within LaTaON 2 and are responsible for a much enhanced photocatalytic performance for water redox reactions under visible light illumination. Under optimal conditions, the Al-doped LaTaON 2 delivers an apparent quantum efficiency of 1.17% at 420 ± 20 nm for water oxidation into O 2 , outperforming most LaTaON 2 -based photocatalysts. These findings highlight Al as a useful dopant to open up the photocatalytic potential of metal oxynitrides whose activity is often undermined by a high defect concentration.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yachao Xu,Zhong Zhou,Peng Yu,Ying Wang
Synergistically tuning electronic states at the atomic level to facilitate photocatalytic overall water splitting is a challenge. However, elucidation of the role of specific electronic states of Znln 2 S 4 (ZIS) in regulating both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) is still scarce, making it difficult to accurately predict the actual photocatalytic performance. Here, the substitution of Zn sites with Al atoms was found to modulate the potential difference of the ZIS surface domain heterojunction structure, and electrons were further transferred to CuS to form a built-in field that promotes charge separation. When Al doping is present on the ZIS surface, ZIS exhibits p-type semiconductor properties, which leads to the formation of p-n junctions within Al-CuS/ZIS itself. Due to the large work function and metallic properties of CuS, and Al-CuS/ZIS as a whole tends to form a Schottky heterojunction, and the two heterojunction structures synergistically promote the migration of photogenerated carriers. In addition, the Al doping changes the electronic states around the ZIS, allowing the Al ZIS to promote the adsorption of O* and H* during OWS. The solar-driven photocatalytic overall water splitting efficiency of Al-CuS/ZIS is as high as 153.6 (HER) and 73.1 (OER) μmol/h g −1 , which is about 10 times that of ZIS. This work opens the possibility to design efficient photocatalytic materials through tunable composition and electronic structure.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 6
·3786-3794
·
IF 2.1
Junqi Chen,Zhaohui Wang,Peili Qing,Jinwu Chen
A series of LiIn 1- x Al x O 2 ( x =0.05, 0.10, 0.15, 0.20, 0.25) microwave dielectric ceramics with low permittivity were synthesized via a solid-state reaction method. XRD, Raman spectra, and SEM analysis reveal that a single LiInO 2 tetragonal structure phase could be obtained at the x < 0.10, and with the x increased further to 0.15–0.25, the diffraction peaks of the secondary phase LiAlO 2 were detected. In the LiIn 1- x Al x O 2 ceramics, the τ f was closely related to the ε r , and the relative density, microstructure, and microwave dielectric properties were effectively improved by the Al 3+ substitution for In 3+ . Bond valence theory analysis demonstrates that the Al 3+ entered the In 3+ site exhibits a strength rattling effect, which is beneficial to the increase of ε r . While Al 3+ substitution for In 3+ simultaneously lowers the average ionic polarizability, resulting in a decrease in ε r . A near-zero τ f (0.74 ppm/°C) combined with ε r approximately 12.83, Q × f = 58 200 GHz, was obtained in LiIn0 .85 Al0 .15 O 2 ceramic sintered at 970°C.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bolong Jiang,Yuhan Zhang,Huan Wang,Kun Liu,Nan Jiang,Jiayou Li,Hua Song,Yanguang Chen
Hydrodeoxygenation (HDO) plays a crucial role in upgrading pyrolysis-oil derived from biomass. Here we describe a method for fabricating a carbon-encapsulated nickel metal–acid bifunctional catalyst (Ni@C/RCS-Al) supported on aluminum-doped radial channel silica (RCS-Al). This catalyst exhibits a large surface area and highly dispersed accessible active sites, achieved through a combination of salicylate- and MOF-assisted strategies. The RCS-Al was prepared by a one-pot salicylate-assisted hydrothermal method in an aqueous phase containing an Al source, which is simple, has a high yield, and saves time. The results show that Ni@C/RCS-Al displays a well-defined radial channel pore structure with a mesopore diameter of 31.1 nm, which can significantly increase the number of accessible active sites and accelerate mass transfer. The MOF-assisted strategy leads to the formation of highly dispersed smaller carbon-encapsulated nickel nanoparticle active sites, and Al doping contributes to the adjustable acid sites, demonstrating that Ni@C/RCS-Al is a metal–acid bifunctional catalyst. Importantly, the kinetics study revealed a high reaction constant for the constructed Ni@C/RCS-Al catalyst. Ni@C/RCS-Al demonstrates remarkable performance in HDO, achieving complete m -cresol conversion and 100 % selectivity to the target product methylcyclohexane within a brief period of 75 min (T = 250 °C p = 2 MPa, m-cresol/catalyst (g) = 7.5). This exceptional performance stems from its radial channel pore structure and optimization of metal–acid sites. The thin carbon layer on the Ni surface contributes to its superior stability and water resistance, as verified by an experimental study and DFT calculations. This work opens up a new idea for the application of radial channel silica-supported catalysts in various reactions.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Guanglan Di,Yuwen Wei,Jiaowei Ding,Yu Zhang,Zefang Chen,Xuede Li,Xiangwei Wu,Xiaoli Zhao
Modulating excitonic effects enables the selective activation of O 2 to singlet oxygen ( 1 O 2 ) for efficient degradation of emerging contaminants (ECs) in complex environmental systems. However, the lack of mechanistic investigation in excitonic effect modulation hinders the efficient O 2 activation towards generating preferred reactive oxygen species (ROS). Taking 2D BiOCl as a prototype, we herein propose a facile aluminum (Al) doping method to enhance the inherent excitonic effects of defective BiOCl (BiOCl OV ) and tailor the O 2 activation pathway for 1 O 2 generation. The Al dopants and surface oxygen vacancies (OVs) cooperatively promote O 2 activation, where OVs mainly promote O 2 absorption while Al mainly promote O 2 activation. A new mechanism for 1 O 2 generation driven by a strong excitonic effect has been proposed via experiments and theoretical investigations. Benefiting from the Al-mediated trapping state for singlet exciton, the intersystem crossing is promoted from singlet excitons to triplet excitons because of a lower singlet–triplet energy gap, thereby leading to a selective activation of O 2 to 1 O 2 by resonance energy transfer between triplet excitons and surface absorbed O 2 . Consequently, Al-doped BiOCl OV exhibits a superior activity and stability toward typical ECs degradation in both simulated and real water matrices. This study elucidates the role of the excitonic effect in selectively activating O 2 to 1 O 2 , offering valuable insights for the optimization of exciton-based photocatalysis through atomic-scale design strategies.
研究领域:
环境科学
·
光催化材料
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xinyu Zhu,Minghao Fang,Shaorou Ke,Bozhi Yang,Shujie Yang,Yanghong Li,Meiling Zhan,Xin Min
In the context of overall water splitting, traditional catalysts like Pt/C and IrO2 are inadequate due to high costs and limited functionality. In response to this challenge, our research introduces a versatile catalytic material, synthesized via an innovative “wet–dry” microwave radiation technique, designed for effective overall water splitting under both acidic and alkaline conditions. In just 110 seconds, we synthesize aluminum-modified ultrathin Rux/RuO2 heterostructures (A-RRO@G), with a diameter of approximately 2.3 nm and a height of less than 1 nm, which significantly reduces cost and preparation time. Thanks to the high atomic utilization and the electronic structure modulation facilitated by the ultrathin Rux/RuO2 heterostructure with the Al dopants, electronic configurations and kinetic reaction pathways are significantly optimized. This results in superior water-splitting performance in both acidic and alkaline environments. Notably, the hydrogen evolution reaction (HER) mass activities surpass those of 20 wt% Pt/C by 16.60 and 5.19 times under alkaline and acidic conditions, respectively, and the oxygen evolution reaction (OER) mass activities exceed that of commercial IrO2 by two orders of magnitude. This research provides insights for developing advanced catalysts tailored for efficient water splitting, marking a significant scientific and practical enhancement in clean energy conversion and storage.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Ningyun Hong,Kang Wu,Zhengjun Peng,Zenghu Zhu,Guofeng Jia,Min Wang
O3-type layered transition metal oxides have shown great promise as high-capacity cathode materials for sodium-ion batteries in large-scale energy storage, due to their low cost and the abundance of sodium resources. However, the limited interlayer spacing and the unstable structure of the O3 phase result in inferior cycling stability and poor rate capability, which could even hinder their practical application process. Hereby, we present that doping with nonelectrochemically active Al in NaAlx(Ni0.5Mn0.5)1–xO2 (x = 0, 0.02, 0.06, 0.1) can effectively alleviate these issues. Among these materials, materials with x = 0.02 exhibited the best electrochemical behavior with improved capacity and better cycling property than other materials. Specifically, the discharge capacity of a 2 mol % Al-doped material possesses 63.2% capacity retention after 200 cycles at a current density of 240 mA g–1, which is 21.4% higher than that in NaNi0.5Mn0.5O2. In addition, a 2 mol % Al-doped electrode also shows outstanding rate capability and delivers 90 mAh g–1 at a high rate of 480 mA g–1, compared to only 67 mAh g–1 for that of the pristine one. X-ray diffraction (XRD), cyclic voltammetry (CV), and galvanostatic intermittent titration technique (GITT) analysis elucidated that the introduced Al dopant can effectively improve the structural stability and promote kinetics of Na+ diffusion mobility. Therefore, the strategy of doping inactive aluminum elements for optimizing the electrochemical performance of NaNi0.5Mn0.5O2 was verified, which could also open an avenue for the design of other O3-type sodium cathode materials.
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）