期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 51, 页码 57322-57329出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c16566
关键词
carbon spheres; mesoporous materials; block copolymer; polydopamine; oxygen reduction reaction
资金
- NSF Center for Hierarchical Manufacturing at the University of Massachusetts, Amherst [CMMI-1025020]
- Army Research Lab [W911NF-15-2-0026]
- Department of Polymer Science and Engineering at University of Massachusetts Amherst
We report the self-assembly of amphiphilic polystyrene-block-poly(ethylene oxide) (PS-b-PEO) brush block copolymers (BBCPs) into spherical micelles in an ethanol/water mixture as an efficient templating approach to fabricate mesoporous carbon spheres using polydopamine as a carbon source. Mesopore sizes of up to 25 nm are well controlled and are dependent on the molecular weight (M-w) of the BBCP. Such large pores are difficult to obtain using traditional linear block copolymers templates. Furthermore, bimodal mesoporous carbon spheres with two populations of pore sizes (24.5 and 6.5 nm) are obtained using a BBCP coassembled with a small molecule surfactant (Pluronic F127). An oxygen reduction reaction is used to demonstrate that electrocatalytic performance can be tuned by controlling the carbon sphere morphologies. This work provides a novel and versatile method to fabricate carbon spheres with broadly tunable bimodal pore sizes for potential applications in catalysis, separations, and energy storage.
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