According to the EDS (Table S2 † ) and EA (Table S4 † ) data, the values of the C/N ratio present an increasing trend in the order of GCN, GCN-Na-0.5, GCN-Na-5, GCN-K-0.5 and GCN-K-5, again indicating that K + has a stronger influence on GCN than Na + .
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A comparison study of sodium ion- and potassium ion-modified graphitic carbon nitride for photocatalytic hydrogen evolution.
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