TY - JOUR
T1 - Synergetic effect of Ni and Au nanoparticles synthesized on titania particles for efficient photocatalytic hydrogen production
AU - Luna, Ana L.
AU - Novoseltceva, Ekaterina
AU - Louarn, Essyllt
AU - Beaunier, Patricia
AU - Kowalska, Ewa
AU - Ohtani, Bunsho
AU - Valenzuela, Miguel A.
AU - Remita, Hynd
AU - Colbeau-Justin, Christophe
N1 - Publisher Copyright:
© 2016 Elsevier B.V..
PY - 2016/8/15
Y1 - 2016/8/15
N2 - Au and/or Ni nanoparticles were synthesized by radiolysis on TiO2 (commercial P25) at various composition (metal content). The modified photocatalysts were characterized by High Resolution Transmission Microscopy (HRTEM), Energy-Dispersive X-ray Spectroscopy (EDS), UV-vis Diffuse Reflectance Spectroscopy (DRS) and X-ray Photoelectron Spectroscopy (XPS). The charge-carrier mobility was studied by Time Resolved Microwave Conductivity (TRMC). The photocatalytic activities were tested under UV-vis irradiation using polychromatic and monochromatic light (action spectrum analysis of apparent quantum efficiency). Surface modified TiO2 with Au and Ni nanoparticles showed high photocatalytic activity for hydrogen evolution from aqueous methanol solution. The enhanced hydrogen evolution rate was obtained for TiO2 co-modified with Au and Ni, where synergetic effect of the two metals was revealed. A very small amount of gold associated to nickel (atomic ratio Ni:Au 5:1 with a total optimized metal loading of 0.5 at%) can induce a significant increase in H2 formation.
AB - Au and/or Ni nanoparticles were synthesized by radiolysis on TiO2 (commercial P25) at various composition (metal content). The modified photocatalysts were characterized by High Resolution Transmission Microscopy (HRTEM), Energy-Dispersive X-ray Spectroscopy (EDS), UV-vis Diffuse Reflectance Spectroscopy (DRS) and X-ray Photoelectron Spectroscopy (XPS). The charge-carrier mobility was studied by Time Resolved Microwave Conductivity (TRMC). The photocatalytic activities were tested under UV-vis irradiation using polychromatic and monochromatic light (action spectrum analysis of apparent quantum efficiency). Surface modified TiO2 with Au and Ni nanoparticles showed high photocatalytic activity for hydrogen evolution from aqueous methanol solution. The enhanced hydrogen evolution rate was obtained for TiO2 co-modified with Au and Ni, where synergetic effect of the two metals was revealed. A very small amount of gold associated to nickel (atomic ratio Ni:Au 5:1 with a total optimized metal loading of 0.5 at%) can induce a significant increase in H2 formation.
KW - Action spectra
KW - Ni:Au/TiO
KW - Photocatalytic H production
KW - Radiolysis
KW - TRMC
UR - http://www.scopus.com/inward/record.url?scp=84960846810&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2016.03.008
DO - 10.1016/j.apcatb.2016.03.008
M3 - Artículo
SN - 0926-3373
VL - 191
SP - 18
EP - 28
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -