NH-rich red poly(heptazine imide) nanoparticles with simultaneously promoted exciton dissociation and activated n → π* electronic transition for boosted photocatalytic H2 generation

Red PHI nanoparticles synthesized by calcining melamine with KCl/KSCN exhibit activated n→π* electronic transition and shortened charge transfer distance, resulting in extended visible-light response range and promoted exciton dissociation efficiency.