RSC Advances
·
2020
·Vol. 10
·期 10
·5666-5672
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IF 3.119
Haiyan Yin,Hong Zheng,Liu Yang,Shuya Wang,Lian Liu
In this work, porous carbon mixed with nitrogen (NC) prepared using Zanthoxylum schinifolium husk as a precursor has been successfully applied in a supercapacitor (SC). The effects of KOH dosage on the structure, composition and capacitive properties of the carbon were investigated by a variety of techniques (SEM, HRTEM, XRD, Raman spectroscopy, XPS, BET, and electrochemical tests). The results of physical characterizations also confirmed that NC had a high specific surface area, abundant pores and a large number of heteroatomic functional groups. Meanwhile, the sample exhibits the best electrochemical performance in a 6 M KOH electrolyte, including high specific capacitance (333.7 F g−1 at a current density of 0.5 A g−1), desirable rate capability and superior cycling stability (97.9% capacitance retention after 5000 cycles). More importantly, the assembled symmetrical supercapacitor (NC-3//NC-3) holds superior energy density (16.7 W h kg−1 at a power density of 300.6 W kg−1) and good cycling stability (98.5% specific capacitance retention after 5000 cycles).
研究领域:
材料科学
·
能源存储
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Keyu Ding,Yaqin Yang,Yanan Mao,Dongdong Tong,Shizhou Lu,Bo Song
Solar-driven interfacial evaporation technology has great potential to address both the freshwater and energy crises in a low-cost, environmentally friendly, and sustainable method. How to achieve highly efficient freshwater and energy harvesting simultaneously is still challenging. Here, a Janus-structured multilayer carbon fabric (JMCF) solar evaporator is proposed to effectively overcome the bottleneck in the cogeneration of fresh water and electricity. The Janus structure of the multilayer fabric effectively controls water supply upwards, improves light absorption and photothermal conversion, increases evaporation surface area, facilitates water vapor escape and inhibits VOCs volatilization. Accordingly, the optimized JMCF solar evaporator can achieve a high evaporation rate of 3.12 kg m -2 h −1 and an output voltage of 0.577 V in 3.5 wt% seawater under 1 sun irradiation. In addition, the JMCF evaporation system also demonstrates good working stability, self-cleaning capacity, environmental adaptability, and economic feasibility. This work provides new ideas and inspiration for the design of high efficiency solar-driven interfacial evaporation system to address the freshwater scarcity, energy crisis, global change problem, etc.
研究领域:
材料科学
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环境科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Li Ma,Yadong Wang,Jingjing Gao,Zongmin Zhu
MXene is a promising flame retardant for composites. Currently, how to construct modified MXene nanomaterials with high flame-retardant efficiency is a challenge. In this work, a functionalized MXene-based flame retardant (MXene-AP-Cu) was synthesized by grafting phytic acid copper complex onto the surface of MXene, and was utilized to prepare high performance epoxy resin (EP) composites. Only 2 wt% MXene-AP-Cu increased limited oxygen index (LOI) of EP to 29.7% from 21%, with an enhancement of 41.4%. In addition, EP/2% MXene-AP-Cu presented excellent suppression effect on the release of heat, smoke and CO, as reflected by a 40%, 18%, 25.3% and 33.3% decreases in peak of heat release rate (PHRR), total heat release (THR), total smoke product (TSP) and peak of CO release rate, respectively, compared to EP. The multiple carbonization of MXene-AP-Cu, including lamellar barrier effect, catalytic carbonization of MXene and copper irons, dehydration and carbonization of phytic acid, contributed to better flame retardancy. Besides, the impact strength of EP/MXene-AP-Cu was increased to a certain extent, compared to EP.
研究领域:
材料科学
·
阻燃材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Zhonglei Kang,Bo-xing Zhang
Due to the increasing pressure of environmental protection and the depletion of oil resources, Eucommia ulmoides gum (EUG) as a natural renewable and degradable biopolymer has attracted more and more attention. In this work, multilayer carbon nanotube film (CNF)/EUG composite films were fabricated through the infiltration and hot-pressing process. By taking advantage of the elasticity of EUG and the specific strength of CNF, composite films exhibited much more improved mechanical strength (maximum tensile stress up to 108.4 MPa) compared with pristine EUG and CNF alone. In addition, composite films prepared with five CNF layers and five infiltration cycles of EUG solution with a thickness of 181 μm can achieve the highest total shielding effectiveness value of 88 dB in 15.6 GHz. Moreover, the folded composite film can recover quickly to the fixed permanent shape when exposed to infrared light, demonstrating fascinating infrared-triggered shape memory behavior. This work provides a facile and general method to fabricate CNF/EUG composite films and is beneficial for pushing forward the practical application of EUG materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Jing-Zhou Chen,Sheng-Guang Wang,Yun-Lei Hou,Wan-Xin Wen,Hua-Ying Wang,Bo-Han Zhang,Dong-Lin Zhao
The severe volume expansion and low electron mobility of silicon-based anode materials during cycling limit their further practical applications, and the use of a multilayer carbon skeleton network and graphene to encapsulate silicon nanoparticles is an effective strategy to cope with the volume expansion of silicon-alloyed anodes and to improve their electron transport. In this work, a carbon skeleton derived from dual ZIF materials was designed and the controlled growth of carbon nanotubes was achieved by changing the capping order of the ZIF materials, which effectively slowed down the capacity degradation of the battery during the cycling process. At a current density of 1 A g −1 , the specific capacity of Si@D-C-ZIF@CNTs@rGO was maintained at 1498.3 mAh g −1 after 500 cycles, and the capacity was maintained at 96 % after 200 cycles of assembling Si@D-C-ZIF@CNTs@rGO as the anode into a full cell. The design of silicon-based anode materials with multi‑carbon skeletons is given a fresh concept by this work.
研究领域:
材料科学
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能源存储
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纳米技术
·
电化学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 7
·3386-3396
·
IF 3.5
Mingfu Li,Liqun Jiang,Sufei Feng,Junsheng Huang,Pingjun Zhang,Jian Zhang
In this study, an efficient modification strategy was proposed by facile loading of trace aluminum ions and p-toluene sulfonic acid (p-TSA) in carbon materials to improve their catalytic activity. p-TSA is then proven to regulate the carbonization process and promote the formation of mesoporous and multilayer structures. The hexa-coordinated aluminum structure is characterized by 1H–27Al solid-state nuclear magnetic resonance (SSNMR) and X-ray photoelectron spectroscopy, which serves as the Lewis–Brønsted acid site in carbocatalysts. Accordingly, the resulting catalyst facilitates a yield of ∼70% for converting glucose to 5-hydroxymethylfurfural (HMF) with a maximum carbon balance of around 91.4% at 150 °C in 6 h. In situ NMR, electrospray ionization mass spectrometry and isotope labeling analysis reveal that the hexa-coordinated aluminum sites promote the isomerization of glucose, and the sulfonic groups facilitate the subsequent dehydration and rehydration of fructose and levoglucosan intermediates. Kinetic models further indicate the decreased energy barrier for glucose conversion over the Al3+/p-TSA intercalated carbocatalyst. This work provides a promising strategy for engineering waste-derived carbocatalysts toward effectively converting carbohydrates to precursors of biofuels and bioplastics.
研究领域:
催化
·
材料科学
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化学工程
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生物化学
✓ 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）