Addition of urea as nitrogen precursor during synthesis of TiO 2 nanotube arrays photocatalyst has been investigated. This study aimed to increase the visible light photo response of TiO 2 by applying nitrogen doped titania nanotube arrays (N-TNTAs) for photoanode preparation in the photoelectrocatalytic process. Nitrogen doped titania nanotube arrays (N-TNTAs) was synthesized by a one-step electrochemical anodization method at 50 V for 2 hour, in the electrolyte solution containing water, ammonium fluoride, glycerol and specified amounts of urea as nitrogen precursor followed by annealing at 500°C for 3 h to induce crystallization. Amount of urea (0.1, 0.2 and 0.4 wt%) in electrolyte solution and annealing atmosphere (air and N2) were varied to enhance visible light photo response. SEM analysis showed that TNTAs and N-TNTAs were successfully synthesized with diameters of 64-320 nm but the morphologies did not show a significant difference. The XRD results showed an identical pattern dominated by the anatase phase. The size of N-TNTAs crystallite is larger than the undoped TNTAs. UV-DRS analysis showed that N-TNTAs have smaller bandgap energy. The smallest bandgap energy was obtained 2.84 eV from N-TNTAs using 0.2% urea with N2 gas annealing (N-TNTAs 0.2% U-N2). Measurement of photocurrent density showed better activity under visible light with smaller bandgap energy.
|Journal||IOP Conference Series: Materials Science and Engineering|
|Publication status||Published - 3 May 2019|
|Event||13th Joint Conference on Chemistry, JCC 2018 - Semarang, Indonesia|
Duration: 7 Sep 2018 → 8 Sep 2018
- nitrogen doping
- nitrogen precursor
- Titania nanotube