Batteries & Supercaps
·
2023
·
IF 5.7
Jiaquan Liu,Zitong Ding,Qiuman Zhou,Lanfei Wei,Yurong Yan
Graphical Metal selenides/biomass derived carbon composite (Ni,Co)Se/BLC was prepared from banana leaves through carbonization and hydrothermal reaction. The metal selenides provide high pseudo-capacitance and the hierarchical porous structure of activated carbon promotes the uniform distribution of them. The prepared composite shows excellent electrochemical properties as supercapacitor electrode. Modification with transition metal compounds is an effective strategy to improve the capacitance of biomass derived carbon. In this work, high-performance (Ni,Co)Se/banana leaves derived carbon ((Ni,Co)Se/BLC) composite with 3D porous structure was prepared by two-step carbonization and subsequent hydrothermal reaction process. The prepared (Ni,Co)Se/BLC exhibits a high specific capacitance of 840.6 F/g at a current density of 1 A/g, which is more than five times comparing with the carbon matrix. Asymmetric supercapacitor, assembled with the (Ni,Co)Se/BLC composite as the positive electrode and BLC as the negative electrode, exhibits a wide potential window of 1.5 V, delivers a high energy density of 34.3 Wh/kg at a power density of 749.8 W/kg, and the power density can reach 7500 W/kg at the energy density of 19.4 Wh/kg. The results reveal that the modification of metal selenide can greatly improve the electrochemical properties of biomass derived carbon, which is significant for the application of biowaste in supercapacitor electrode materials.
研究领域:
材料科学
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能源存储
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jin-Bo Cheng,Hai-Bo Zhao,Min Cao,Meng-En Li,Ai-Ning Zhang,Shu-Liang Li,Yu-Zhong Wang
We describe the design and manufacturing method of a lightweight C-doped MoS2 aerogel with a special regular banana leaflike microstructure used for high-performance microwave absorbers. The aerogel precursor was first fabricated by a self-assembly process between alginate (Alg) and ammonium thiomolybdate (ATM), where Alg as a template was assembled with ATM into regular banana leaflike architectures along the ice growth direction during oriented freezing. After pyrolysis at 900 °C, the C-doped MoS2 aerogels maintained low densities and porous hierarchal banana leaflike structures, where the banana leaves ranged in diameter from about 2 to 5 μm with the growth of small branches. Benefitting from these features, the C-doped MoS2 aerogel possessed excellent microwave absorption performance in the frequency range of 2–18 GHz. The minimum reflection loss (RL) reached −43 dB at 5.4 GHz with a matching thickness of 4 mm, and the effective microwave absorption band (RL < −10 dB) reached 4 GHz (14–18 GHz) at a thickness of 1.5 mm. Our findings also provide strategies for designing MoS2 aerogel nanostructures for electronic devices, catalysis, and other potential applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 4
·1-12
·
IF 2.9
Ye Tingting,Li Min,Li Xiaoxi,Chen Tong,Su Zengjian
In this study, the hydrophobicity and lipophilicity of banana leaf fibers were modified by in situ synthesis and sol–gel method, and the adsorption properties of the modified fibers were investigated using petroleum as the adsorbate. The surface morphology of modified fibers was characterized by SEM. It was found that the surface formed a rough structure with granular material. At the same time, the hydrophobic and lipophilic properties of the modified fiber had been greatly improved. Firstly, the contact angles between the two modified fibers and water are greater than 110°, which greatly improves the flotation performance of the fibers, making them suitable for treating oil spills on seawater surfaces; secondly, the oil removal rates of the modified fiber in seawater were 98.7% and 94.7% respectively, and kinetic study indicated that the quasi-second-order kinetic model and Langmuir isothermal adsorption model are better consistent with the adsorption of petroleum by modified fiber, which shows that the adsorption is the result of the joint action of physical adsorption and chemical adsorption; in addition, the modified fibers have good reuse characteristics because their properties did not decline significantly after they were reused.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 8
·1-9
·
IF 5.3
Cai Tingting,Zhao Yifan,Zhang Tingyu,Yang Yun
Three kinds of N-doped carbon dots (CDs) were synthesized via the solvothermal method using orange juice, lemon juice, and banana leaves as biomass precursors. These CDs exhibited different fluorescence of blue, green, and red with the fluorescence quantum yield (FLQYs) of 16.2%, 14.5%, and 8.4%, respectively. The structure and composition analysis showed that B-CDs and G-CDs were nitrogen doped by urea with the content of about 4%, improving the fluorescence intensity significantly. Notably, the FL of R-CDs were composed of a blue FL emission and a red FL emission, which were inferred to be related to the CDs and chlorophyll-derived porphyrin. Three corresponding CD-based fluorescent inks were prepared by mixing with the thickening agent of glycerol. The application on handwriting, screen printing, and official seal indicated the multilevel UV/visible light dual-mode encryption potential. Furthermore, flexible sensing films were fabricated by incorporating CDs into polyvinyl alcohol (PVA) matrices. Remarkably, the CD-embedded films exhibited significantly enhanced electrical signal responses during mechanical sensing. This work not only provides a novel strategy for high-value utilization of biomass resources but also opens innovative pathways for developing intelligent anti-counterfeiting materials and flexible electronic devices. Graphical
研究领域:
材料科学
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纳米技术
·
化学
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光学工程
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安全技术
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应用物理
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高分子科学
·
可持续化学
✓ 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）