s, and charge transfer dynamics, a

s, and charge transfer dynamics, a possible
mechanism for the improved photocatalytic activity could be
proposed. As shown in Figure 6d,e, given the simultaneous
introduction of boron dopants and nitrogen defects, the
remarkable enhancement in photocatalytic water oxidation
activity of BHx can be explained by: (1) The exceptionally tuned
CB and VB positions give rise to band structures well opti￾mized for the effective optical absorption in visible light and
the sufficient driving force for water oxidation reaction. (2) The
engineered electronic structures create abundant unsaturated
sites and induces strong interlayer C–N interaction, resulting
in efficient electron excitation and promoted charge transport.
All the positive contributions of the synergistic effects between
boron dopants and nitrogen defects give rise to the best photo￾catalytic ability of BHx among those reported g-C3N4 samples.
In summary, a simple and effective approach of NaBH4
thermal trea