Optimizing the Crystallinity of Heptazine-Based Crystalline Carbon Nitride by Regulating Temperature for Enhanced Photocatalytic H₂ Evolution

Figure 7

(a) Time-varying photocatalytic H₂ production and (b) average hydrogen production rate of all samples; (c) cycling hydrogen production test; (d) wavelength-dependent AQE (right axis) and UV–vis light absorption spectrum (left axis) of KCN630.

(a)

(b)

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