Abstract
Multifunctional ordered mesoporous carbon materials that feature high surface area, uniform pores, good conductivity of the carbon skeletons, and specific host-gust interactions, which are of interest for a wide variety of applications, for instance, catalysis, photonics, bioscience, and energy storage, are presented. Here, we establish a facile and generalizable “coordination-assisted self-assembly” for encapsulation of aggregation-free and highly dispersed metal nanoparticles inside the mesoporous carbon frameworks. The choice of pyrogallol as phenolic resin precursor is essential for the in situ encapsulation, because the strong coordination between the three hydroxide groups of pyrogallol and metal ions favors the immobilization of transition metal into the mesopores, and then suppress the sintering of metal nanoparticles at high carbonization temperatures. The metal supported mesoporous composites possess the very high loading content of 1.25 %–7.27 %, tiny particle sizes of 4.3–15.6 nm and high surface area of 475–589 m 2 /g. The unique structure in deed endows high sulfur loading content in the conductive mesoporous carbon channels, and meanwhile metal nanoparticles as catalyst effectively promotes the electrochemical conversion of polysulfides, resulting in a high reversible capacity, excellent rate capability and good cycling stability for Li−S batteries.
Original language | English |
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Pages (from-to) | 724-730 |
Number of pages | 7 |
Journal | ChemElectroChem |
Volume | 6 |
Issue number | 3 |
DOIs | |
State | Published - Feb 1 2019 |
Externally published | Yes |
Funding
This work was supported by the Young Thousand Talented Program and the National Natural Science Foundation of China (21671073, 21621001, and 21671074), the “111” Project of the Ministry of Education of China (B17020), Program for JLU Science and Technology Innovative Research Team, Nature Science Foundation of Shan Xi Province for Significant Basic Research (2017ZDJC-30), and the Fundamental Research Funds for the Central Universities.
Keywords
- coordination-self-assembly approach
- lithium-sulfur battery
- mesoporous materials
- nanocomposites
- porous carbon