Homojunction engineering holds promise for creating high-performance photocatalysts, yet significant challenges persist in establishing and modulating an effective junction interface. To tackle this, we designed and constructed a novel Janus homojunction photocatalyst by integrating two different forms of triazole-based carbon nitride (C₃N₅). In this design, super-sized, ultrathin nanosheets of carbon-rich C₃N₅ grow epitaxially on a nitrogen-rich honeycomb network of C₃N₅, creating a tightly bound and extensive interfacial contact area.

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