MOLECULES
·
2025
·Vol. 30
·期 8
·1804
·
IF 4.6
Wentao Xiang,Zhenzhen Yu,Renwu Gao,Zhichao Yi,Kun Gong,Kangqiang Lu,Weiya Huang,Changlin Yu,Zeshu Zhang,Man Zhou,Kai Yang
Rapid charge separation and transfer is the key scientific problem in photocatalysis. The construction of S-scheme heterojunction is one of the effective strategies to promote charge separation and maintain the strong redox properties. Herein, the NiO, K0.2WO3, and NiWO4ternary double S-scheme K0.2WO3/NiO/NiWO4heterojunction (W/NiO) was created by a one-step molten salt method. Ultraviolet-visible (UV-Vis) diffuse reflectance spectra, photoluminescence (PL) spectra, photoelectrochemistry tests, and other analyses revealed that the double S-scheme heterostructure broadened the spectral response range of NiO and promoted its separation of photocarriers. Compared with pristine NiO, the modified double S-scheme heterojunction enhanced the surface adsorption of water molecules and the accumulation of intermediate product of HCOO−, and optimized the CO2reduction system, realizing the improved CO yield of 373 μmol·g−1·h−1in Ru(byp)32+/ethanolamine of CO2reduction system. This study indicates that double S-scheme heterojunction could facilitate efficient photogenerated charge transfer and separation, thereby achieving high activity and selectivity for CO2photoreduction. Our work provides a reference for the one-step construction of double S-scheme heterojunction.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Yiming Li,Zhihao Yu,Mengyan Guo,Ming Zhang,Jian Xiong,Yina Qiao,Rui Zhang,Xuebin Lu
Carbon-based materials have become the most commonly used electrode materials for supercapacitors due to their simple production and low preparation cost. The preparation of hierarchical porous carbon materials with excellent properties using biomass materials is a very valuable study. Therefore, we used crab shells as carbon precursors to prepare crab shell-based carbon materials by using the self-templating method (CaCO 3 ) combined with low-temperature eutectic molten salt. When the composition of the eutectic salt was CaCl 2 /KCl (molar ratio of 43:57) and the mass ratio of crab shells to eutectic salt was 1:5, the prepared crab-shell-based carbon material (CC-CaK-5) exhibited excellent physical and electrochemical properties with high specific surface area (1193.7 m 2 g −1 ), rich heteroatom doping (O (7.83 %) and N (6.71 %)), and high specific capacitance (290 Fg −1 at 0.5 Ag −1 ).The CC-CaK-5//CC-CaK-5 devices assembled with CC-CaK-5 as the electrode material exhibited excellent electrochemical performance. At a current density of 1 Ag −1 , the capacitance value of the device remained at 93.11 % of the initial capacitance value after 5000 cycles. The energy density reached 6.95 Whkg −1 at a power density of 302.09 Wkg −1 and remained at 4.71 Whkg −1 at a power density of 13,037.54 Wkg −1 .
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Xiang Liu,Mengmeng Wang,Longping Deng,Ya-Jun Cheng,Jie Gao,Yonggao Xia
A huge number of spent lithium-ion batteries (LIBs) have caused serious problems such as resource waste and environmental pollution. Lithium iron phosphate (LFP) is one of the major cathode materials in the spent LIBs. It is urgently needed to develop a safe, environmentally friendly, and cost competitive approach to regenerate the LFP cathode collected from the spent LIBs. The nitrate molten salt process has been utilized to regenerate layered cathode materials, which are nevertheless non-compatible with the LFP regeneration process. The LFP crystal lattice will be destroyed during the molten salt process by the oxidative environment, where Fe(II) is oxidized to Fe(III). A new approach is proposed in this work to tackle this issue, where a low-temperature molten salt process is coupled with a reductive environment to suppress oxidation of Fe(II). In detail, lithium nitrate is used as a molten salt medium and lithium source simultaneously. Sucrose is used as a carbon source to provide a reductive environment. Through a short molten-salt relithiation step at 300 °C and further annealing process at 650 °C, LFP particles with a lithium-deficient and damaged structure can be successfully recovered. The rapid lithium replenishment process exposes more (101) crystal planes facilitating lithium-ion transportation. As a result, the regenerated LFP delivers a specific capacity of 145 mAh g–1 at 0.5C, which is more than a 13% increase relative to the spent LFP and has a better rate performance than pristine LFP at 5C. In addition, we also point out that the LFP is converted to Li3PO4 with the increase in lithium source and the extension of treatment time. This work provides a new promising way to regenerate spent LFP cathodes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Junting Wang,Jun Li,Kai Wang,Jie Gong,Yuan Li,Gaoke Zhang
Although the preparation of Aurivillius-type oxyfluoride compounds as photocatalysts has been reported, the control synthesis of Bi 2 NbO 5 F with the exposed highly active facets is still challenging. Herein, the pure Bi 2 NbO 5 F plates have been successfully synthesized through a novel molten salt strategy. Compared to Bi 2 NbO 5 F prepared by solid state method (BF S), the Bi 2 NbO 5 F obtained by molten salt method revealed better crystallinity and purity. Transmission electron microscope (TEM) and corresponding selected area electron diffraction (SAED) confirm that the main exposed facet of Bi 2 NbO 5 F plates is {010} facet. Density functional theory (DFT) calculations indicated Bi 2 NbO 5 F crystal belongs to direct-gap semiconductor and its {010} facet was the most active facet due to its highest surface energy. The Bi 2 NbO 5 F sample with exposed highly active {010} facet exhibited promoted photocatalytic activity for degradation of tetracyclines (TC) and rhodamine B (RhB) in water as compared to the BF S. The free radical capture experiments prove that O 2 − , OH and h + are the main active radicals. The Bi 2 NbO 5 F plates with exposed {010} facet still had high photocatalytic activity even after four cycles. Finally, the possible mechanism of Bi 2 NbO 5 F nanoplate for photocatalytic degradation of pollutants was proposed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2013
·
IF 1.547
Lijun Luo,Fenfen Hu,Li Xiong,Xiaofan Li,Meili Zhou,Zhengliang Wang
A series of red phosphors Y2O3:Eu3+ were prepared by the molten salt method with different surfactants. Their structures, morphologies, and the photoluminescent properties were investigated at room temperature. The particles size of Y2O3:Eu3+ can be controlled by adjusting the kinds of surfactants. The phosphor Y2O3:Eu3+ prepared with NP-10 [polyoxyethylene (10) nonyl phenyl ether] shows regular morphology and higher crystallinity, and its average particle size is about 200 nm. Bright red light can be observed by naked eyes from the red phosphor under 254 nm excitation.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 6
·5735-5740
·
IF 1.798
Liu Chang,Liu Yunfei,Lyu Yinong,Lyu Chongguang
Octahedra-like NaNd(MoO 4 ) 2 microcrystals with tetragonal scheelite-type structure were successfully synthesized by a low cost molten salt method using halons (NaCl or NaBr) as flux. The as-prepared products were characterized by powder X-ray diffractometer, field emission-scanning electron microscope and photoluminescence spectrometer (PL). The results show that the reaction parameters including calcining temperature, reaction time, and the type of salt play important roles on the morphologies and sizes of the NaNd(MoO 4 ) 2 microcrystals. The excitation spectra of the NaNd(MoO 4 ) 2 octahedron-like crystals were observed with a maximum peak at 585 nm (λ em = 1066 nm). The emission spectra were recorded under excitation wavelength of 585 nm and exhibit the strongest peak at 1066 nm. In addition, the results revealed the size effect on the PL intensity of NaNd(MoO 4 ) 2 crystals, that the PL intensity of microcrystals is higher than that of nanocrystals. These imply that NaNd(MoO 4 ) 2 microcrystals have potential application in the field of solid state laser materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 152
·期 12
·3843-3852
·
IF 2.936
Huang Xuehui,Yang Na,Li Xiaobo,Pan Hongyun,Song Xiaozhan,Chang Yu
La 0.8 Sr 0.2 MnO 3 (LSM) catalyst has been successfully prepared by solid phase method (G-LSM-T), sol–gel method (C-LSM-T) and molten salt method (S-LSM-T), using as-prepared MnCO 3 microspheres as templates, respectively. It was shown that the S-LSM-550 catalyst presented well-formed perovskite structures, large specific surface area (49.65m 2 /g) and promising catalytic activity in CO oxidation, which T 50 and T 90 for CO conversion over fresh S-LSM-550 were 145.14 °C and 170.73 °C. The S-LSM-550 calcined at 550 °C for 2 h exhibited excellent thermal stability and catalytic activity compared with the samples prepared by solid phase method and sol–gel method. Its superior catalytic performance could be greatly attributed to its stable microstructure, high surface Mn 4+ /Mn 3+ molar ratio and more available surface adsorbed oxygen species. Graphical Abstract
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Hui Yang,Wei Shuai,Xinwei Zhu,Lei Lai,Jie Liu,Changwei Li,Jie Yang,Guangjin Wang,Yingxi Chen
The exploration of high-efficiency non-noble metal catalysts for improving the intrinsic activity and active sites for overall water splitting persists as a bottleneck issue. Herein, a facile heterogeneous molten salt strategy has been proposed to fabricate CoP/Co nanosheets array that is vertically attached to a carbon matrix. Such a hierarchical structure endows the hybrid with abundant active sites and favorable reaction kinetics. Experimental results reveal that the molten salt determines the final shape of metallic Co, which is not sensitive to the organic sources. After optimization of the molten salt mass, the CoP/Co/C-6 shows the best bifunctional performance, requiring an overpotential of 132 mV and 320 mV at 10 mA cm −2 for hydrogen evolution reaction and oxygen evolution reaction, respectively. Theoretical simulation results manifest the CoP/Co heterostructure alters the electronic structure of Co and CoP , and reduces the adsorption free energy of intermediates, thus further boosting the electrocatalysis activity. This work proposes a molten salt-assisted method for the rational design of novel two-dimensional nano-hybrids for energy conversion applications.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Qiang Zhang,Zhenghua Qian,Xueyang Liu,Lin Li,Xilei Duan,Ting Yu,Xiaofeng Liu,Yanbo Qiao
In addition to uranium, thorium is a vital nuclear element that has broad potential for future nuclear energy applications. Herein, we report the synthesis of cubic structured ThO2 nanocrystals (NCs) based on the decomposition of their nitrate salt in air and in a molten salt medium. Both the processes yield pure ThO2 NCs with average sizes of <100 nm. The ThO2 NCs synthesized in the molten salt medium exhibit better crystallinity and a larger average size of ∼75.1 nm with a narrow size distribution owing to the high-temperature liquid growth environment. The ceramic sintered from the salt-derived ThO2 NCs exhibits a considerably higher relative density of 94.6% and similar thermal properties compared with the ceramic fabricated from fine nanopowders (<10 nm) obtained from direct thermolysis of metal nitrate. This study shows that thermal decomposition in a molten salt medium could be an efficient method for producing highly crystalline metal-oxide NCs of thorium-based fuels used in nuclear energy applications.
研究领域:
材料科学
·
核能工程
·
化学合成
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xuefeng Liu,Tao Wang,Jianmin Liu,Feng Jiang,Huidong Tang,Guo Feng,Weihui Jiang
High quality single-crystal zirconia nanosheets were successfully prepared via molten salt method, using solvothermally synthesized product as precursor. The effects of heat treatment temperature and soaking time on the phase composition and morphology of samples were investigated by X-ray diffraction, Fourier transform infrared spectroscopy , Thermal analyzer, Raman spectrometer, Field-emission scanning electron microscope and Transmission electron microscope. The results show that zirconia nanosheets with a thickness of 60–80 nm and a width-thickness ratio up to 13 could be obtained by using NaCl and Na 3 PO 4 as composite salts at 900 °C for 5 h. The precursors containing Zr–OH and Zr–O bonds have relatively high activity, which is beneficial to crystal growth. In addition, the as-prepared nanosheets with exposed (001) plane are monoclinic-structured and show no distinct defect. The growth behavior of particles during dissolution-recrystallization process is analogous to self-focusing mechanism. The preparation method can be extended to wet-chemical synthesis of other nanomaterials .
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xuekai Wang,Yongze Cao,Yuanbing Mao,Tianshuo Liu,Xianglan Yan,Lei Li,Jinsu Zhang,Baojiu Chen
Low phonon tantalate-based phosphors with a layer structure are considered to have excellent upconversion luminescence (UCL) intensity, which could be reduced due to the existence of impure phase defects and inappropriate doped rare earth ions. To improve their UCL performance, we have prepared single-phase CaTa4O11:Er3+/Yb3+ samples by a molten salt synthesis (MSS) using KCl as the reaction medium and compared its UCL properties with counterparts made by a conventional solid-state reaction (SSR) in this study. We have demonstrated that the MSS samples have a much higher UCL intensity under 980 nm laser excitation than the SSR ones due to accurate replacement of Ca2+ sites by Er3+/Yb3+ in high-purity single-phase MSS samples. We have further enhanced the green UCL intensity of the MSS samples by 1.57 times via acid picking (AP). Under 980 nm laser excitation at a high powder density of 61.3 W/cm2, the green UCL intensity of the MSS-AP samples can reach 3.72 times that of the SSR-AP samples. For potential luminescence thermometry applications, the maximum absolute sensitivity (SA) of the MSS-AP samples reaches 0.01316 K–1 at 501 K based on the luminescence intensity ratio. This study shows that CaTa4O11:Er3+/Yb3+ phosphors prepared by the MSS method are single-phase samples with excellent pure green UCL as a suitable temperature sensing material.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science Letters
·
2012
·Vol. 10
·期 1
·274-278
·
IF 0
Liu Chenglu,Wang Fang,Zhou Zhiqiang,Jia Peiyun
YNbO4:Eu nano-phosphors were successfully prepared in NaNO3 molten salt. X-ray diffraction was used to characterize the structure of the samples. The results indicate that a suitable amount of NaOH in NaNO3 molten salt can effectively improve the crystallinity
of the samples annealed at same temperature; meanwhile, the elevation of annealing temperature increases the crystallinity, and transfers the crystalline phase from scheelite to fergusonite. The micrographs of transmission electron microscopy reveal that the grain size increases with the elevation
of annealing temperature. Upon excitation into the niobate groups at 260 nm, YNbO4:Eu nano-phosphors exhibit weak emission at 405 nm, originated from Nb–O charge transfer transition and the characteristic emission of Eu3+, which indicates there is an energy transfer
from niobate group to Eu3+. Monitored by emission of 615 nm, the excitation spectrum shows that the f-f transition of 7F0–5L6 at 396 nm is more intense than the Nb–O charge transfer band at 260 nm. This intense absorption at
396 nm make YNbO4:Eu nano-phosphors an excellent candidate of white light emitting diode.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
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