Yan Xinlong,Yang Yingli,Wang Chao,Hu Xiaoyan,Zhou Min,Komarneni Sridhar
Abstract The synthesis of mesoporous zeolitic imidazolate framework-8/silica composites with foam-like structure templated by Pluronic P123 ( EO
20
PO
70
EO
20
) block copolymer surfactant in the presence of swelling agent was demonstrated in this study. It was found that 1,3,5-trimethylbenzene was a suitable swelling agent, which worked effectively in the pluronic-P123-templated synthesis of zeolitic imidazolate framework-8/silica composites when a moderate amount was added. The pore diameter of the foams in resulting composites increased to 50–60 nm when the 1,3,5-trimethylbenzene /P123 weight ratio of 3/4 was used during the synthesis. In addition, the composite with enlarged diameter of foams showed superior adsorption capacity to phthalic acid (H 2 -PA) at 20 °C in comparison with aggregated bulk zeolitic imidazolate framework-8. Graphical Abstract
Qiang Zhang,Jiahui Li,Dongwei Ma,Gui Lu,Yongli Li,Yong Ding,Carlos Ponce De Leon,Chuan Wu,Jia Hong Pan
Mesoporous carbon hollow nanospheres (MCHS), synthesized via a block copolymer-mediated supramolecular self-assembly process, serve as both anode materials for lithium-ion batteries (LIBs) and cathode materials for aluminum-ion batteries (AIBs). By adjusting the carbonization temperature and the dosage of the pore extender, 1,3,5-trimethylbenzene (TMB), insights into the relationships among pore structure , crystal structure, and electrochemical properties of MCHS in Li/Al-ion batteries are gained. Their exceptional properties, including hierarchically porous structure, large surface area, tailored inner voids, mesoporous shells, and high electronic conductivity, contribute to high specific capacity, improved rate performances, and remarkable electrochemical stability. Crystallographic insights reveal that highly porous MCHS facilitate the intercalation of ionic lithium and aluminum species into the carbon crystal lattices while maintaining structural integrity. The appropriate mesopore size significantly impacts the storage of lithium or aluminum ions, with relatively larger mesopore sizes being more beneficial for aluminum ion storage compared to lithium ions . The optimal MCHS exhibit a stable discharge specific capacity of 330.8 mAh·g −1 after 800 cycles at a current density of 372 mA·g −1 (1C) in LIBs and 41.6 mAh·g −1 after 500 cycles at 74.4 mA·g −1 in AIBs.
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