Figure 1

TG/DTA plots recorded from 30 to 900°C at a heating rate of 5°C/min using the TiO2 photo-anode paste including (a) 1.5 wt% acetylene-black. TG/DTA plots recorded from 30 to 900°C at a heating rate of 5°C/min using 1.5 wt% acetylene-black TiO2 paste samples treated at (b) 350, (c) 400, (d) 450, (e) 500 and (f) 550°C for 30 min. The “asterisk” in the figures means the exothermic peak which exhibited the thermal decomposition of acetylene-black.