INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
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2024
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IF 6.4
Chongyang Wei,Yi Li,Jinliang Song,Jinxing Cheng,Zhongfeng Tang
The application of erythritol to medium-temperature latent heat energy storage systems is limited by its low thermal conductivity and large supercooling. Three types of graphite foams (GFs) with different thermal conductivities were used as the porous skeleton for encapsulating erythritol via vacuum impregnation, and the erythritol/GF composites were investigated using different methods to solve the aforementioned problems. The GF pores were effectively filled with erythritol via vacuum impregnation, and the filling rate of erythritol reached more than 90%. The thermal conductivity of the erythritol/GF composites was 73.80, 35.05, and 13.30 W/m·K. The thermal conductivity of the erythritol/GFs was improved by 26–158 times over that of pure erythritol. The subcooling degree of the erythritol/GF composites was reduced from 64.1 °C to 59.4 °C, facilitating the release of latent heat. The erythritol/GF composites had remarkably boosted thermal stability compared with that of pure erythritol. The developed erythritol/GF phase-change composite material exhibits excellent heat transfer and storage properties, and it has broad prospects in the field of phase-change heat storage at intermediate temperatures.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 4
·期 4
·1399-1407
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IF 7.443
Guangyu Zhao,Li Zhang,Jixian Lv,Changle Li,Kening Sun
Hydrothermal self-assembly is a highly efficient and low cost method to prepare graphitic foam from graphene oxides; however, the self-assembly frameworks usually do not have controllable pore structures because of the spontaneous process. In this paper, a hydrothermal synthesis assisted by ammonium peroxo-polymolybdate [(NH4)2Mo2O11] tailoring to fabricate graphitic foam is presented. The foam possesses pore structures which can be controlled by adjusting the rate of charge in the hydrothermal experiments. Furthermore, the foam obtained from a definite rate of charge [(NH4)2Mo2O11 : graphene oxide is 1 : 2 in weight] has a hierarchical pore structure and a through-hole net. In electrochemical energy storage, such unique features are beneficial for providing efficient mass transport as well as abundant, accessible active sites. The graphitic foam was tested for use as self-supported electrodes of Li–O2 batteries (LOBs) and Li ion batteries (LIBs) without any metallic current collectors or organic binders, and the foam frameworks exhibited remarkable lithium ion storage properties in both of the two batteries (e.g., 5500 mA h g−1 at 0.2 A g−1 as LOB cathodes and 250 mA h g−1 at 50 A g−1 as LIB anodes).
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Hai-Ming Song,Li-Jing Zhu,Mei-Xia Shi,Ai-Yuan Li,Yang-Yang Sun
In order to fully utilize the advantages of expandable graphite (large specific surface area and porous structure), a solvent-free method was used to provide a supporting skeleton for expandable graphite through melting, bonding and solidification of polyvinylidene fluoride (PVDF). Based on its porous structure and enhanced mechanical stability, the formed PVDF/expandable graphite composite foam, amounts of functional groups were introduced throughout the foam (outside on the surface and inner side in the expandable graphite) by deposition of tannic acid (TA) and dopamine (DA), endowing it selective adsorption characteristics. The functioned foam exhibited excellent dynamic dye adsorption capacity by capturing dye molecules firmly through π-π interaction, hydrogen bonding, and charge attraction between the functional groups and dyes. Furthermore, with low zeta potential (-24.9 mV), the functional groups showed selective adsorption properties resulting in rapid separation of cationic dyes and anionic dyes. The functionalized PVDF/expandable graphite composite foam contact these two materials together in order to complement each other's advantages, showing a new research orientation for the treatment of different types of dyestuff wastewater.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Ke Zheng,Zefeng Li,Jiading Wang,Shengqiang Nie,Shaoyun Guo,Xianlong Zhang
Traditional interface adhesive materials usually require heating or slow curing at room temperature. To overcome this defect, this study proposed a brand-new strategy: electrothermal effect of a conductive network was comprehensively utilized so as to generate heat only at the adhesive interface, which sufficiently promoted the epoxy to cure and cross-link to obtain a strong interface adhesion. Concretely, the Ni nanoparticles were uniformly embedded in the graphite foam wall to build a dense nickel layer by plasma-assisted activation. Then, the interpenetrating epoxy resin with a latent curing agent was filled into these continuous pores to achieve epoxy/Ni/graphite foam composites (EP-Ni@GF). The composites can rapidly heat up to 160 °C at a low voltage of 0.9 V, and the interface adhesive strength was 5.93 MPa, which reached 92.7% of the traditional thermal curing. Unexpectedly, the electrothermal area was concentrated on the interface without damaging the other components. The thermal conductivity of EP-Ni@GF reached 122 W m–1 K–1, and the Ni@GF exhibited extraordinary electromagnetic interference shielding effectiveness (EMI SE) of ≈111.23 dB. This work provided a new idea for the preparation of interface adhesive composites with high thermal conductivity and excellent EMI shielding.
研究领域:
材料科学
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热管理技术
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电磁兼容性研究
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Mingyu Liu,Songdi Zhang,Yongxiang Shi,Zhiming Fang,Junjie Wang,Chenlu Bao
The widespread utilization of phase change materials (PCMs) has been impeded by challenges such as leakage, low thermal/electrical conductivity, and inadequate light absorption. Although constructing interconnected three-dimensional (3D) carbon networks within PCMs can mitigate these issues, their complex and energy-intensive fabrication processes, coupled with insufficient mechanical strength causing significant leakage and collapse of liquefied PCMs under external loads or impacts, hinder their practical application. Herein, we present a novel approach for the preparation of 3D graphite/polyvinyl alcohol foam (GPF) through a simple vacuum foaming combined with air-drying method. The obtained GPF-5 exhibits impressive compression strength (4.46 MPa) and compression modulus (93.1 MPa) at low density of 0.30 g/cm 3 . Upon impregnation with polyethylene glycol (PEG), GPF-5/PEG exhibits notable mechanical strength (7.62 MPa), contributing to its thermal shape stability and resistance to leakage. Even when subjected to temperatures above the melting point of PEG under external loads, GPF-5/PEG maintains its original shape without any liquid leakage. Due to the efficient construction of 3D thermal conductivity pathways within GPF, GPF-5/PEG demonstrates a high thermal conductivity of up to 3.48 W/m K −1 with graphite contents of 21.1 wt%, representing an increase of 136 % and 1640 % compared to graphite/PEG (with equivalent graphite content) and pure PEG, respectively. Additionally, GPF-5/PEG displays high latent heat of melting (136.8 J/g) and superior thermal cycling stability. Moreover, GPF-5/PEG demonstrates high solar-to-thermal and electric-to-thermal energy conversion capabilities, highlighting their potential for diverse applications. The work offers a rational strategy for fabricating high-modulus carbon foam, which can be used for PCMs-based multi energy conversion and storage systems with high thermo-mechanical properties.
研究领域:
材料科学
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能源工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 34
·13859-13867
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IF 0
Chengxin Peng,Huixin Chen,Qiongyu Li,Weiwei Cai,Qin Yao,Qingsheng Wu,Jinhu Yang,Yong Yang
The silicon material is the most promising candidate for developing new-generation lithium-ion batteries with high energy and power output. However, there remains a significant challenge due to poor electrical conductivity and pulverization of the silicon based anode during cycles. Aiming to solve these problems, in this work we fabricate a novel 3D composite architecture made of a Si@SiOx core–shell nanowire array grown on a 3D graphitic foam (Si CNW–3D GF) substrate by a well-designed multiple-step approach. The prepared Si CNW–3D GF composite shows the integrated advantages for high-performance lithium ion batteries, including its light weight, open macroporosity, high conductivity, high Si NW loading, excellent flexibility as well as SiOx buffer layers. As a result, the Si CNW–3D GF composite exhibits excellent performance such as high reversible lithium storage capacity (3603 mA h g−1 at a current density of 840 mA g−1), excellent cycling performance (up to 100 cycles) and superior rate capability (2299 mA h g−1 at 4200 mA g−1 and 1206 mA h g−1 at 8400 mA g−1), which is 2 times that of the Si CNW electrode where Si CNWs were grown directly on a stainless steel current collector without the presence of 3D GF.
研究领域:
材料科学
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电化学
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纳米科技
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能源存储
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功能材料
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电池技术
✓ 已验证
DOI
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Wellars Utetiwabo,Muhammad Khurram Tufail,Chaoyuan Zeng,Lei Zhou,Le Yang,Ze Hua,Jinfeng Zeng,Peiwen Yu,Ruiwen Shao,Wen Yang
The induction of cation dopant into the lattice structure of anode materials is a feasible and effective method to modulate the electronic structure and induce different active sites for Li + storage. However, it is a challenge to create the cation dopant into the structure of the transition metal oxides anode of the lithium-ion batteries (LIBs). In this work, we propose an in-situ source template thermal reduction of graphite foam (GF) and annealing process for the first time to successfully induce Ti 3+ into the titanium niobium oxide (Ti 2 Nb 10 O 29 , TNO) nanocrystal structure denoted as TNO@GF for high-energy/power lithium storage. The induction of Ti 3+ could not only prompt the more active sites for Li + ion storage but also modulate the electronic interaction between the active sites and the intercalated Li + ion, leading to the favorable Li + ions intercalation and minimizing the Li + -ion diffusion barriers in the open channel of the ReO 3- type structure unit. Due to the combined effect of nanocrystal structure and Ti 3+ , TNO@GF yields a higher reversible discharge capacity of 328 mAh g −1 at 0.1C, a higher rate capability of 296.3 mAh g −1 ; and keeps 207.88 mAh g −1 at a high rate of 35 C and shows good cycling stability (217.73 mAh g −1 at the rate of 10 C) with the capacity retention of 83.20 % after 500 cycles. These findings provide insights into cation engineering and its influence on the functional nanomaterials' physicochemical properties, which are not achievable in the perfect crystal for advanced energy storage applications.
研究领域:
材料科学
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电化学
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能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）