  CO2 capture is a pressing global environmental issue that drives scientists
to develop creative strategies for tackling this challenge. The concept in this
contribution is to produce site specific nitrogen doping in microporous carbon
fibers. It creates a carbon/carbon heterojunction by using poly(ionic liquid)
(PIL) as soft activation agent that deposits nitrogen species exclusively on
the skin of commercial microporous carbon fibers. Such carbon-based biphasic
heterojunction amplifies the interaction between carbon fiber and CO2 molecule
for unusually high CO2 uptake and resistive sensing.
