JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 4
·3679-3683
·
IF 1.338
Li Suwen,Huang Qingqing,Jiang Yi,Hu Min
A series of Ce3+-Yb3+ co-doped CaF2 nanoparticles were prepared by a hydrothermal synthesis method. The structure, morphology, photoluminescence properties, and fluorescence dynamics were studied systemically. Under the excitation of the 5d level of
Ce3+, an efficient energy transfer from Ce3+ to Yb3+ occurred, and the efficient near-infrared emission at 900–1050 nm matching to the energy of Si band gap of Si-based solar cells was observed. The lifetime of Ce3+ decreased, and the inner
quantum efficiency increased with increasing Yb3+ concentration. The quantum efficiency dependent on Yb3+ concentration was calculated, and the maximum efficiency approached 186%. As a down-conversion luminescent convertor, this kind of material can be used in front of
Si-based solar cells to reduce thermalization loss and enhance conversion efficiency of solar cells.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Shizong Wang,Jianlong Wang
In this study, the bimetallic and nitrogen co-doped biochar was prepared for peroxymonosulfate (PMS) activation to degrade emerging contaminants. Compared to single metal-doped biochar, bimetallic-doped biochar showed much higher catalytic activity. Iron and cobalt co-doped biochar (FeCo-BC) exhibited higher catalytic activity than iron and copper co-doped biochar (FeCu-BC). When FeCo-BC was used for PMS activation, sulfamethoxazole (SMX) could be completely removed within 10 min, with the degradation rate of 0.749 min −1 , which was 2.3 and 69.4 times higher than that of Fe-BC (0.333 min −1 ) and Co-BC (0.0108 min −1 ), respectively, demonstraing the synergistic effect of bimetallic co-doping. Meanwhile, the SMX mineralization efficiency reached 57.1 %. In the system of FeCo-BC/PMS, multi reactive species produced, in which hydroxyl radicals, sulfate radicals and high-valent metal-oxo mainly contributed to SMX degradation. The superior catalytic activity of FeCo-BC was attributed to the configuration of FeNx-CoNx. In five consecutive experiments, FeCo-BC showed good catalytic activity and stability. This study provides a way to the rational design of high efficient and stable PMS catalyst, which could be used in Fenton-like reaction to remove the emerging organic contaminants.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2023
·
IF 4.6
Yuping Gai,Junbo Hu,Wei Deng,Wenshuo Xie,Xiang Li,Jingjing Zhang,Dewu Long,Shanlin Qiao,Fei Jiang
Summary. Electrochemical water decomposition as a crucial approach for the gradual growth of renewable energy has attracted extensive attention. Metal-organic frameworks (MOFs) which benefit from ultra-high specific surface area, controllable nanostructures, and excellent porosity have been widely used as high activity catalyst for the decomposition of water by electrochemical means. Herein, the composition and morphology of metal–organic framework nanoclusters with bimetallic Co/Fe-incorporated PTA/FDA nanoclusters is designed for efficient and durable OER electrocatalysts, including CoFe-BTC/PTA, CoFe-BTC/FDA, and CoFe-PTA/FDA. The crystal structure of MOF materials is composed of alternating organic hydrocarbon BTC, PTA, or FDA and inorganic metal oxide layer. Co and Fe interact as central atoms, joining BTC, PTA, or FDA ligands to form a highly symmetric MOF structure. The electronic structures and active sites of various metals are different, and the insertion of iron atoms plays a certain role in the regulation of their electronic structures. CoFe-PTA/FDA shows significant OER overpotential (1.525 V vs. RHE) reached 10 mA cm-2, with 62.85 mV dec-1 for Tafel slope and pretty conspicuous stability (72 hours of continuous testing). The DFT calculation results show coordination unsaturated metal atom is the primary active center of these electrocatalytic reaction, and the coupling effect caused by adding Fe is the key to adjust the electrocatalytic activity.
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高影响因子
Journal of CO2 Utilization
·
2022
·
IF 8.321
Xin Zong,Yingmin Jin,Yumeng Li,Xuebai Zhang,Shiji Zhang,Haijiao Xie,Jinqiu Zhang,Yueping Xiong
Electrochemical CO 2 reduction (ECR) is a promising approach to realize carbon neutral and energy sustainability , which is still impeded by the low selectivity and activity for application. Defect engineering of electrocatalysts , especially oxygen vacancy introduction into metal oxide materials has been proved to be an effective strategy to satisfy thermodynamic condition and improve kinetics for ECR. Herein, we synthesize oxygen vacancy-enriched ZnO nanoparticle catalysts for efficient ECR through electrospinning technique using particular precursor. Characterizations reveal that the utilization of Zn(CH 3 COO) 2 precursor contributes to the generation of oxygen vacancies in ZnO catalysts which enhances CO 2 adsorption and stabilizes the intermediate. In a flow cell configuration, a current density of 150 mA cm −2 and a CO Faradic efficiency > 80% can be obtained for ZnO nanoparticle catalysts (p-ZnO-800), which is meaningful for industry.
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高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 16
·4869-4880
·
IF 7
Ruiting Zhang,Yahong Jin,Yanmei Li,Haoyi Wu,Yihua Hu
Inorganic photochromic materials hold great scientific and technological promise in the field of optical information storage due to their numerous advantages, including an extended color change duration, exceptional fatigue resistance, and robust thermal stability. However, their practical application has been hindered by relatively slow coloring and bleaching rates. In this study, we present a P-type photochromic perovskite material, LiTaO3:Bi3+/Sm3+, with an ultra-fast optical response. LiTaO3:Bi3+/Sm3+ exhibits a rapid coloring time of approximately 25 seconds and an ultra-fast bleaching time of approximately 1 second, achieved through alternating 254 nm and 365 nm light irradiation. Notably, the photobleaching rate of LiTaO3:Bi3+/Sm3+ is currently the fastest among all reported inorganic photochromic materials. The prepared LiTaO3:Bi3+/Sm3+ material exhibits a maximum color change contrast of 26.49% and excellent fatigue resistance. The codopant Bi3+ plays a critical role in creating traps within the host lattice, which greatly enhances photochromism contrast and enables efficient long afterglow luminescence. These dual properties make the material suitable for dual-mode optical information storage in both bright and dark fields. Finally, the excellent optical properties of LiTaO3:Bi3+/Sm3+ are demonstrated in its application for erasable optical information storage vividly.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Beibei Liu,Xiaohua Ren,Long Chen,Xiaoxin Ma,Qiong Chen,Qidi Sun,Lin Zhang,Pengchao Si,Lijie Ci
High efficient adsorption of radioiodine in nuclear waste has attracted extensive attentions all over the world. In this work, we fabricated sulfur and nitrogen co-doped graphene aerogels (SN-GA) through one-step hydrothermal method, and investigated its iodine adsorption behavior including adsorption kinetics and isotherms in water. Our results reveal that SN-GA exhibits a 3D porous architecture with thiophene-S, oxidized-S, pyridine-N, pyrrole-N and graphite-N co-doped into the sp 2 carbon frameworks. The adsorption experiment showed SN-GA has a maximum iodine adsorption capacity of 999 mg g −1 determined by Langmuir isotherm, and the adsorption process could be better described by the pseudo-second-order model.
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高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Zhi-Wen Zhang,Cui-Ying Lu,Guang-Hui Liu,Yuan-Jia Cao,Zhen Wang,Ting-ting Yang,Yu-Hong Kang,Xian-Yong Wei,Hong-Cun Bai
A green and effective nitrogen and nickel in-situ doping strategy was designed to prepare cellulose-based N/Ni co-doped porous carbon (PC). The co-hydrothermal pretreatment induced by hydrazine hydrate and nickel acetate effectively modifies the physico-chemical structure of PC and further improves its electrochemical performance. The efficient N-supply and unique heteroatom regulation performance of hydrazine hydrate is related to its strong reducibility. The specific surface area and total pore volume of the synthesized N 4 NiPC 220-3 are 1383.66 m 2 g −1 and 0.59 cm 3 g −1 , while the N and O contents are 1.35 and 10.41%, respectively. At current densities of 0.5 and 20 A g −1 , N 4 NiPC 220-3 exhibits a high specific capacitance of 415 F g −1 and a good capacitance retention of 72.22%, respectively. After 10,000 charge/discharge cycles, the retention rate is as high as 96.06%, confirming its excellent cycling stability. The two-electrode system test results further show that the energy density of N 4 NiPC 220-3 is as high as 35.6 W h kg −1 at a power density of 500.1 W kg −1 , while a high retention rate of 87.87% is still obtained after 10,000 cycles. This green and efficient synthesis method based on in-situ co-doping of hydrazine hydrate and nickel acetate is a promising alternative strategy for producing carbon-based supercapacitors.
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高影响因子
Nano Hybrids and Composites
·
2022
·
IF 0
Yue Zhang,Tao Li,Shi Yu Tang,Xin Yue Xie,Ru Zeng Liang,Xiao Xiao Chu
Increasing demands of microwave absorbents require new approaches to enhance the absorbing performance. Metal−organic frameworks (MOFs) could be developed as effective absorbers owing to their outstanding features including intrinsic porosity and high specific area. Herein, novel nanostructured Co-MOF-74 composites have been successfully fabricated via a simple solvothermal method. Excellent absorption performance was achieved for the composite with a minimum reflection loss (RL) of −25.5 dB at 2.5 mm and a broad absorption bandwidth (RL < −10 dB) of 6.7 GHz. Such absorber could be developed as lightweight and high-efficiency absorbing materials, and this work provides inspiration for the design of advanced absorbers with strong dissipation capacity and broad effective bandwidth.
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ChemElectroChem
·
2015
·Vol. 3
·期 2
·204-208
·
IF 0
Tianhao Li,Xiaoyan Wang,Weiyong Yuan,Chang Ming Li
Graphical DEAFening : For the first time, a protic ionic liquid, diethylammonium format, is used as a multifunctional electrolyte in a water-splitting cell, demonstrating a unique role as co-catalyst. Hydrogen production from water splitting holds great promise for solving today's energy crisis but it is challenging to have high efficiency and low cost. For the first time, a protic ionic liquid (PIL), diethylammonium formate (DEAF) was used as a multifunctional electrolyte in water splitting, demonstrating a unique role of co-catalyst for the hydrogen evolution reaction (HER) with the highest current density (21 mA cm −2 at −0.5 V) and the most positive onset potential (−0.002 V) in comparison to aprotic ILs and commonly used inorganic salts. Moreover, the concentration of PIL and temperature of electrolyte solution were optimized. The possible mechanism for the multifunctionality and high performance for water splitting using this PIL was proposed using X-ray photoelectron spectroscopy (XPS). The high performance for HER, simplicity and low cost for synthesis, and unique properties make DEAF highly promising as an electrolyte toward water splitting.
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GREEN CHEMISTRY
·
2019
·Vol. 21
·期 8
·2129-2137
·
IF 9.405
Di Liu,Ping Yang,Hao Zhang,Minjie Liu,Wenfei Zhang,Dongmei Xu,Jun Gao
A non-noble heterogeneous catalyst – a Co, N and C composite encapsulated carbon nanotube grown in situ on the surface of activated carbon (Co–N–C/CNT@AC) – was fabricated via the pyrolysis–reduction process. Co–N–C/CNT@AC catalyzed the reductive coupling of structurally diverse nitroarenes and alcohols to imines and secondary amines under exogenous base- and solvent-free conditions. BET, TEM, SEM, XRD and XPS characterization showed that the exceptional catalytic property of Co–N–C/CNT@AC could be explained by its nanostructure, Co–N and basic N species. Our protocol had advantages of low cost, environment-friendliness, and good applicability. Furthermore, a reaction route of nitroarenes, amines and alcohols as the starting materials was proposed to improve the atom economy of the reductive coupling of nitroarenes with alcohols.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Dongwei Xu,Yumei Ren,Xiaoqin Guo,Desheng Feng,Run Yang,Biao Zhao,Rui Zhang
Multiscale and multicomponent design has been recognized as one of the most effective strategies to improve absorption performance of microwave absorption materials . Herein, the magnetic functional composites aerogels containing core-shell CoO@Co nanoparticles , porous graphene nanosheets (PGN) and carbon nanotubes (CNTs) were successfully fabricated by combining solvothermal method and subsequently calcination processes. The results demonstrated that the calcination temperatures determined the chemical composition (CoO, α-Co, β-Co and CNTs) and complex structure (core-shell and porous characteristics) of the resultant composites aerogels, which affected the magnetic properties and electromagnetic parameters . Interestingly, at the calcination temperature of 650 °C, CNTs were uniformly grown on the surface of porous graphene nanosheets under self-generated cobalt metal catalyst . As expected, the paraffin-based composites aerogels of S650 samples with 15 wt% filling contents presented outstanding microwave absorption performance (MAP) in view of both minimum reflection loss ( RLmin , −63.39 dB, d = 3.4 mm) and the effective absorption bandwidth ( EAB , RL values below −10 dB, 6.5 GHz, d = 2.4 mm). Considering these excellent properties in mind, the composites aerogels with unique complex structures hold great promise as synergistic microwave absorbers for electromagnetic pollution .
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 10
·1-12
·
IF 2.8
Ni Hanwen,Zhang Faqiang,He Zichen,Liu Zhifu
The CaTiSiO 5 -based ceramics show promise as dielectric materials for high-temperature MLCC due to their excellent temperature stability which is expected to be improved by co-doping at the A/B sites. In this study, the Dy and Al co-doped CaTiSiO 5 ceramics (Ca 1− x Dy x Ti 1− x Al x SiO 5 , x = 0, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08) were fabricated by the conventional solid-state method. The effects of Dy and Al co-doping on the phase structures, dielectric properties and impedance characteristics, were investigated in detail. CaTiSiO 5 -based ceramics transformed to the paraelectric phase and achieved excellent temperature stability of permittivity by Dy and Al doping, which results from the long-range disorder in the arrangement of Ti displacements within the octahedral chain. Components with x = 0.01 showed linear dielectric response under the electric field. It obtained a high and stable dielectric constant in a wide temperature range ( ε r = 52, TCC ≤ ± 180 ppm/°C over the temperature range from − 55 to 300 °C), low loss (tan δ < 0.07), high breakdown strength (∼ 516 kV/cm) and high DC resistance ( ρ = 3.8 × 10 10 Ω cm at 300 °C).
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高影响因子
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