An alternative and more efficient way to produce hydrogen is by conversion of solar energy to hydrogen using a semiconducting photocatalyst without an applied electrical bias. To become industrially viable and truly sustainable, catalysts need to be stable against long-term irradiation and should be composed of earth abundant and environmentally benign elements. Those requirements are met by organic photocatalysts such as carbon nitrides and microporous polymer networks. Carbon nitride was first shown to catalyze the evolution of small amounts of hydrogen from water. The efficiency of polymer photocatalysts was improved over time by the introduction of donor-acceptor interactions, by increased conjugation between building blocks, and by exfoliation of bulk catalysts to more accessible nanosheets with rates of hydrogen evolved exceeding 300 mmol h -1 g -1 . Ideally, a sustainable catalyst should function without the addition of noble-metal co-catalysts, but the majority of current materials performs significantly worse without platinum additives. Previously, we have shown that organic photocatalysts retain a high hydrogen evolution activity in the absence of platinum only when strong intramolecular donoracceptor interactions ensure an efficient separation of photoexcited electron-hole pairs. In these examples, we achieved strong D-A interactions by direct coupling of thiophene-based donors and triazine-based acceptors. In addition, we found that highly conjugated, ordered polymer photocatalysts benefit less from co-added platinum than glassy, disordered polymers systems. Considering the rapid development of the field, the variety of electron-accepting building blocks commonly employed is surprisingly small. The electron-deficient triazine (C3N3) ring is widely used as an acceptor in organic photocatalysts, light emitters, and sensors, due to its ubiquitous derivatives that can be obtained easily e.g. by the acid-catalyzed trimerization of aromatic nitriles. Alternatively, the larger heptazine (C6N7) core can be integrated into nitrogenbridged donor-acceptor systems. To this date, however, only the triazine core has been directly cross-coupled with carbon-carbon bonds into photoactive materials. Recently, sulfone oxides were introduced into hydrogen evolution photocatalysts. The sulfone oxides serve two functions: