In the simultaneous presence of bor

In the simultaneous
presence of boron dopants and nitrogen defects, the BH400
sample exhibits further enhanced photocatalytic activity. The
average oxygen evolution rate of BH400 is 1.4-, 1.7- and 1.9-fold
higher than that of CN–H, CH–B, and pristine g-C3N4, respec￾tively (Figure S7, Supporting Information). This comparitive
results imply that boron dopants and nitrogen defects have the
synergetic effects on the greatly improved oxygen production
activity of g-C3N4. The gradual decrease in the oxygen evolu￾tion rate as the reaction prolonging (Figure 5e) is mainly due
to the light-shielding effect reducing optical absorption, with
the photoreduction of Ag+ on the surface of the catalyst.[32] This
is an inevitable phenomenon in photocatalytic water oxidation
as always observed in previous reports.[32–35] Then, to avoid the
optical shield effects of the photoreduced Ag particles, KIO3 was
used as electron scavenger to evaluate the photocatalytic sta￾bility of B