Document
Universidad Autónoma de Nuevo León, UANL
Generically Dependent Continuant
RDF description of Photocatalytic hydrogen evolution over the isostructural titanates: Ba3Li2Ti8O20 and Na2Ti6O13 modified with metal oxide nanoparticles - http://orbis.uaslp.mx/vivo/individual/scopus5730
International Journal of Hydrogen Energy
Article
Information Content Entity
Photocatalytic hydrogen evolution over the isostructural titanates: Ba3Li2Ti8O20 and Na2Ti6O13 modified with metal oxide nanoparticles
Cocatalysts; Hydrogen evolution; Titanates; Tunnel structure Barium compounds; Copper oxides; Metal nanoparticles; Metals; Nickel compounds; Photocatalytic activity; Sol-gel process; Sol-gels; Charge separations; Co catalysts; Hydrogen evolution; Isostructural titanates; Metal oxide nanoparticles; Photocatalytic hydrogen evolution; Titanates; Tunnel structures; Lithium compounds
Isostructural titanates exhibiting rectangular tunnel structure with the general formula Na2Ti6O13 and Ba3Li2Ti8O20, were synthesized by solid state and sol-gel methods. The structural, morphological, optical, textural and electrical properties of the materials were characterized by XRD, SEM, UV-vis, BET and EIS. The photocatalytic activity for hydrogen evolution of the materials was evaluated under UV light. Na2Ti6O13 exhibited higher activity (120 μmol/gh) than Ba3Li2Ti8O20 (30 μmol/gh), and it was attributed to the distortion of the octahedrons in Ba3Li2Ti8O20, which increases the recombination of charges in the material. Additionally, the 1D dimension obtained in Na2Ti6O13 promotes a better charge separation, transport and utilization in this phase. The activity of the materials was enhanced with the incorporation of metal oxide nanoparticles MO (M = Cu, Ni) as cocatalysts. The activity of Ba3Li2Ti8O20 increased 10 times with the addition of CuO (240 μmol/gh), while the activity of Na2Ti6O13 increased 3.5 times (416 μmol/gh). This improvement in the photocatalytic activity of the isostructural titanates was attributed to the formation of a p-n heterostructure between n-type titanates and p-type CuO, which promoted an enhanced charge separation, transference and utilization. © 2017 Hydrogen Energy Publications LLC
Secretaría de Educación Pública, SEP: PRODEP-103.5/15/14156, PROFOCIE-2014-19-MSU0011T-1