 highlights proposing a one-step pyrolysis strategy to fabricate a novel bilayer-shelled-in odoped hollow porous carbon microspheres NOHPC anode. The optimized NOHPC anode displays a high case storage capacity of 325.9 mAh g-1 at 0.1 AG-1 and excellent rate performance, 201.1 mAh g-1 at 5 AG-1 after 600 cycles. The assembled NOHPC forward slash forward slash hollow porous activated carbon microspheres HPAC potassium ion hybrid capacitors deliver a high energy density of 90.1 WHKG-1 at a power density of 939.6 WKG-1 even over 6,000 cycles. This article was authored by Jin Pan, Yong Chen, Yang Li, and others.