Book chapter
Enhance Photoactivity of Hydrogen production with mixed oxide: TiO2-NiO as semiconductor.
XVI International Congress of the Hydrogen Mexican Society 2016
Registro en:
Pérez Larios, A.,Gomez, R., Zanella, R., Bedia, J., Belver C. (2016). Enhance Photoactivity of Hydrogen production with mixed oxide: TiO2-NiO as semiconductor. XVI International Congress of the Hydrogen Mexican Society 2016.
En trámite
Autor
Pérez Larios, Alejandro
Gómez, Ricardo
Zanella, Rodolfo
Bedia, Jorge
Belver, Carolina
Institución
Resumen
Memorias The most studied processes at the present for the hydrogen production are electrochemical, steam
reforming of alcohols or hydrocarbons and water splitting. Thus, the water splitting using
semiconductors materials had recently acquired great relevance because of the low cost for the
hydrogen production. The principle of this technique is based on the photoexcitation of the
semiconductor using a UV or visible light sources.
The alternative method of photocatalytic water splitting is promising since it involves the
absorption of light to produce hydrogen by irradiating oxide semiconductors. Photocatalytic
systems for water splitting may contain sacrificial reagents, as methanol, commonly used in the
photocatalytic evolution of H2 from water, since its hydroxyl group captures photogenerated holes
and minimizes the probability of e-/h+.
In this study, Titanium dioxide doped with Nickel (1.0, 3.0, 5.0 and 10.0 % wt) by sol-gel method
were obtained. The solids were characterized by nitrogen adsorption using adsorption isotherm
(BET) and porosity (BJH) method, XRD patterns and UV-Vis spectroscopy. The photoactivity was
evaluated using a Pyrex reactor of 200 ml using a solution Methanol-Water (1:1) and 0.1 g of
catalyst. A high pressure Hg lamp (with a 254 nm, = 2.2 mW/cm2 ) encapsulated in a quartz
tube was used as source of energy.
The results showed materials with specific surface area among 100 to 180 m2/g and mesopority
characteristics. The XRD patterns show the formation of the crystalline anatase phase. The band
gap energy (Eg) for the materials were obtained with UV-Vis spectroscopy, the Eg values were
lower than 3.2 eV. In the water splitting evaluation a maxim in the efficient was found at Ni at 10
wt.%. The hydrogen produced was 3000 μmol. Sociedad Mexicana de Hidrógeno