2.4. Photoelectrochemical measurements
The photoelectrochemical experiments were performed at
room temperature (around 23 ◦C) under visible light illumination
in a 60 mL quartz cell using a three-electrode electrochemical system.
In the system,the as-prepared samples were used as a working
electrode. A saturated Ag/AgCl and a platinum wire were used as
reference electrode and counter electrode, respectively. The visible
light irradiation was provided by a 250W halogen lamp (MVL-
210, Instrumental Corporation of Beijing Normal University, with
a light filter cutting off the light below 400 nm). The fabricated
TNTAs and Cu2O-loaded TNTAs were vertically placed in the center
of a rectangular quartz cell to be irradiated by the visible light
passing through the quartz window. The UV light with the wavelength
below 400 nm were excluded by the ultraviolet cutoff filter
(UVCUT400)insertedbetweenthe light source andthe quartz cell.A
CHI660D electrochemical station was used for application of potential
bias, photocurrent signal recording. The photocurrent of the
working electrode were studied according to the responses to light
in 0.1 M Na2SO4 supporting electrolyte solution with magnetic stirring.