Porous　carbon　with　a　large　specific　surface　area　(SSA)　and　high　porosity　is　the　optimal　electrode　material　for　supercapacitors.　However,　traditional　KOH　activation　continues　to　face　obstacles,　such　as　low　yield,　high　corrosion,　and　environmental　contamination.　In　this　study,　nitrogen-doped　(1.68%　N　content)　porous　carbon　(C-PKAC1.5)　with　high　yield　(26.3%),　large　SSA　(2820.65　m2　g-1),　and　uniform　size　was　prepared　from　p-phenylenediamine　(PDA)　using　potassium　acetate　(KAc)　instead　of　potassium　hydroxide　(KOH).　Throughout　the　procedure,　KAc　played　the　following　crucial　roles:　(1)　KAc　and　PDA　could　form　a　network　of　hydrogen　bonds　and　mix　homogeneously,　with　PDA　providing　a　nitrogen　dopant　and　carbon　source.　(2)　Following　polymerization,　the　KAc　reconstituted　into　lamellae　and　attained　geometric　partition　of　the　polymer　matrix,　left　diffusion　microtunnels,　and　provided　a　homogenized　particle　size　of　carbon　in　the　subsequent　stage.　(3)　During　activation,　KAc　melts　and　diffuses　into　the　polymer　matrix　via　microtunnels,　where　it　is　converted　to　K2CO3　to　activate　from　inside　to　outside,　thereby　averting　the　low　yield　associated　with　conventional　activation　from　outside　to　inside.　The　supercapacitor　assembled　for　C-PKAC1.5　has　a　high　specific　capacitance　of　25.17　F　g-1,　a　capacitance　retention　rate　of　82.77%　after　30,000　cycles,　and　an　energy　density　of　8.29　W　h　L-1　at　a　power　density　of　199.25　W　L-1　©　2023　American　Chemical　Society