National Taiwan University Dept Chem EngnWu, Nae-LihNae-LihWuLee, Min-ShueiMin-ShueiLeePon, Zern-JinZern-JinPonHsu, Jin-ZernJin-ZernHsu2006-11-152018-06-282006-11-152018-06-282004http://ntur.lib.ntu.edu.tw//handle/246246/2006111501233283TiO2 photocatalysts were synthesized by a sol–gel process followed by calcination at 400 ◦C in Ar, air, N2, H2 (3% in N2) and vacuum (∼5×10−3 torr), respectively. Toward H2 production from a water/methanol (vol. ratio = 1.4/1) solution, the catalysts exhibited activities in the order, according to calcination atmosphere, of Ar > air > N2 > vacuum ∼ H2. The low activity resulting from either vacuum or H2 calcination was ascribed to a reduced coverage of surface hydroxyl and high bulk defect density, based on the X-ray photoelectron and UV-Vis spectroscopic analyses, while the high activity from Ar calcination is to enhanced visible-light excitation.application/pdf101500 bytesapplication/pdfen-USTiO2PhototcatalysisHydrogen productionMethanolCalcination atmosphereX-ray photoelectron spectroscopy[SDGs]SDG7journal articlehttp://ntur.lib.ntu.edu.tw/bitstream/246246/2006111501233283/1/5344.pdf