Tailoring thermal resistance of porous materials with void filling for improved hydrogen adsorption

被引:5
作者
Sun, Nan [1 ]
Yang, Chen [1 ]
Song, Jiang-Feng [2 ]
Li, Yin-Tao [1 ]
Yang, Wen-Bin [1 ]
Zhou, Yuan-Lin [1 ]
Luo, De-Li [2 ]
Zhang, Quan-Ping [1 ]
机构
[1] Southwest Univ Sci & Technol, Sichuan Civil Mil Integrat Inst, Sch Mat & Chem, State Key Lab Environm friendly Energy Mat, Mianyang 621010, Peoples R China
[2] China Acad Engn Phys, Inst Mat, Jiangyou 621908, Peoples R China
基金
中国国家自然科学基金;
关键词
Hydrogen adsorption; Porous materials; Thermal conductivity; Hydrogen isotope separation engineering; METAL-ORGANIC FRAMEWORK; ISOTOPE-SEPARATION; CONDUCTIVITY; MODEL; GAS; 5A;
D O I
10.1016/j.ijhydene.2022.11.254
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Porous materials such as 5A molecular sieve (5A) display huge thermal resistance due to high porosity and lots of voids between grains that is negative to hydrogen isotope sepa-ration engineering. Generally, introducing thermal conductive fillers contributes to reducing thermal resistance while results in decreasing volume ratio of porous materials and then certainly causes declined hydrogen adsorption capacity. Here, a liquid poly-dimethylsiloxane (PDMS) is pressed into the voids between 5A grains, which is further developed into a silicon, oxygen and carbon (SiOC) structure suffering from 350 degrees C sin-tering. 5A/SiOC composite at 10 wt% polydimethylsiloxane (5A/SiOC10) displays 0.74 W/mK of thermal conductivity, which is about 300% higher than that of neat 5A. More impor-tantly, enhanced rather than reduced hydrogen adsorption capacities at a fixed volume of the composite are determined. 5A/SiOC10 shows adsorption capacities of H2 (175.4 mL/ cm3) and D2 (188.4 mL/cm3) while neat 5A shows that of H2 (171.6 mL/cm3) and D2 (165.8 mmol/cm3) at 77 K with 1 bar. Besides, enhanced thermal conductivity of porous materials shortens the cycle time of hydrogen isotope separation that contributes to reducing energy consumption. This work proposes a novel strategy on void filling to tailor thermal resistance of porous materials, which open a window to improve hydrogen isotope separation with thermal management materials.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:8588 / 8595
页数:8
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