Hydrogen　peroxide　(H2O2)　plays　a　crucial　role　in　various　applications,　such　as　green　oxidation　processes　and　the　production　of　high-quality　fuels.　Currently,　H2O2　is　primarily　manufactured　using　the　indirect　anthraquinone　method,　known　for　its　significant　energy　consumption　and　the　generation　of　intensive　by-products.　Extensive　research　has　been　conducted　on　the　photocatalytic　production　of　H2O2　via　oxygen　reduction　reaction　(ORR),　with　polymeric　carbon　nitride　(PCN)　emerging　as　a　promising　catalyst　for　this　conversion.　This　review　article　is　organized　around　two　approaches.　The　first　part　main　consists　of　the　chemical　optimization　of　the　PCN　structure,　while　the　second　focuses　on　the　physical　integration　of　PCN　with　other　functional　materials.　The　objective　is　to　clarify　the　correlation　between　the　physicochemical　properties　of　PCN　photocatalysts　and　their　effectiveness　in　H2O2　production.　Through　a　thorough　review　and　analysis　of　the　findings,　this　article　seeks　to　stimulate　new　insights　and　achievements,　not　only　in　the　domain　of　H2O2　production　via　ORR　but　also　in　other　redox　reactions.　©　2024　Wiley-VCH　GmbH.