Research Article

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

Figure 3

XPS spectra of PCN and KCN630: (a) survey; (b) C 1s; (c) N 1s; (d) K 2p.
(a)
(b)
(c)
(d)