Copolymer-Derived N/B Co-Doped Nanocarbons with Controlled Porosity and Highly Active Surface

N/B co-doped nanocarbon (NBC) is emerging as promising candidate in various applications. However, most synthetic approaches require complex heteroatom/carbon precursors, and suffer from poor porosity control and inevitable formation of electrochemically inactive N-B bonded species. In this study, we propose a new route to produce NBC from a single copolymer precursor, polyacrylonitrile-b-poly(styrene boronic ester) (PAN-b-PSBpin). Both polymeric blocks play dual roles during pyrolysis, i.e., PAN serves as both a carbon source and nitrogen source, and PSBpin functions as both a boron source and porogenic block. Importantly, a linear relationship between mesopore size in NBC and block length in copolymers was observed, allowing for excellent porosity control in NBC. Xray photoelectron spectroscopy revealed only separated N and B configurations in formed NBC, assuring highly active surface examined by an efficient four-electron transfer process in oxygen reduction reaction and large geometric capacitances (C-sa = 68 mu F cm(-2) and C-vol = 750 F cm(-3)) in supercapacitors. (C) 2020 Wiley Periodicals, Inc.