Photoirradiation-enhanced behavior via morphological manipulation of CoFe₂O₄/g-C₃N₄ heterojunction for supercapacitor and CO₂ reduction

Regulating the morphology of graphitic carbon nitride (g-C₃N₄, CN) and constructing CoFe₂O₄/g-C₃N₄ (CFO/CN) heterojunctions were adopted in the photocatalytic energy storage and photocatalytic CO₂ reduction (PCR). CFO/CNS had outstanding light response ability, while CFO/CNT possessed excellent charge transfer ability. Consequently, CFO/CNT electrode exhibited the highest specific capacitance without light, CFO/CNS electrode showed the most obvious photo-enhanced capacitance behavior with an increase by 21.05 % under light. This was ascribed to the generation and separation of photo-generated carriers, promoting oxidation/reduction reactions. And in PCR, the electron consumption rates of four CFO/CN heterojunctions were CFO/CNT > CFO/BCN > CFO/MCN > CFO/CNS. CFO/CNT presented the highest photocatalytic activity, attributing to the strong redox ability and photo-enhanced electron transfer. This strategy of utilizing CFO/CN heterojunctions to construct photo-enhanced supercapacitor electrodes and photocatalytic CO₂ reduction catalysts provided new ideas for energy conversion and storage.