The
photoelectrochemical application system with in situ energy
storage and anticorrosion dual function is constructed, in which a
loose morphology carbon nitride thick film electrode prepared by the
one-step gas expansion strategy is used as a photoanode, and photoelectrochemical
anticorrosion performance is used as an evaluation. The long-range
electron path resulted from the structure design can cause certain
delay of the recombination of photocarriers, which facilitates the
realization of simultaneous energy storage and anticorrosion for this
system. The loose morphology promotes the ion transfer kinetics, shortens
the energy storage time (20 times) greatly, and broadens the capacity
(160 mV). The energy storage efficiency of this system is up to 50%,
and the discharge time (discharge to −0.7 V) is 3000 times
that of the system based on the compact carbon nitride film electrode.
Moreover, the photoelectrochemical anticorrosion efficiency is increased
by 82 times and can provide as long as 6 h cathodic protection for
carbon steel.