TY - JOUR
T1 - Photocatalytic Hydrogen Evolution Using Ni-Pd/TiO2
T2 - Correlation of Light Absorption, Charge-Carrier Dynamics, and Quantum Efficiency
AU - Luna, Ana L.
AU - Dragoe, Diana
AU - Wang, Kunlei
AU - Beaunier, Patricia
AU - Kowalska, Ewa
AU - Ohtani, Bunsho
AU - Bahena Uribe, Daniel
AU - Valenzuela, Miguel A.
AU - Remita, Hynd
AU - Colbeau-Justin, Christophe
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/7/6
Y1 - 2017/7/6
N2 - TiO2 surface modification with bimetallic nanoparticles (NPs) has demonstrated to be a strategy to enhance the hydrogen generation via photocatalysis and to minimize the use of expensive noble metals. A better understanding of the role of bimetallic NPs is of crucial importance to design efficient photocatalysts. Here, we show a systematic study of surface modification of commercial TiO2 (P25) with mono- and bimetallic (Ni, Pd, and Ni-Pd) NPs synthesized by radiolysis. The photocatalysts were characterized by High Resolution Transmission Microscopy (HRTEM), Scanning Transmission Electron Microscope (STEM), X-ray Diffraction (XRD), Energy-Dispersive X-ray Spectroscopy (EDS), X-ray Photoelectron Spectroscopy (XPS), and UV-vis Diffuse Reflectance Spectroscopy (DRS). The charge-carrier dynamics was studied by Time Resolved Microwave Conductivity (TRMC). The photocatalytic activity was evaluated for hydrogen generation under UV-vis irradiation using polychromatic and monochromatic lights (action spectra analysis of apparent quantum efficiency). TiO2 modified with Pd-Ni bimetallic NPs exhibits a high activity for H2 generation, and a synergetic effect of the two metals was obtained. The study of light absorption, charge-carrier dynamics, and photocatalytic activity revealed that the main role of the metal NPs is to act as catalytic sites for recombination of atomic hydrogen. (Chemical Equation Presented).
AB - TiO2 surface modification with bimetallic nanoparticles (NPs) has demonstrated to be a strategy to enhance the hydrogen generation via photocatalysis and to minimize the use of expensive noble metals. A better understanding of the role of bimetallic NPs is of crucial importance to design efficient photocatalysts. Here, we show a systematic study of surface modification of commercial TiO2 (P25) with mono- and bimetallic (Ni, Pd, and Ni-Pd) NPs synthesized by radiolysis. The photocatalysts were characterized by High Resolution Transmission Microscopy (HRTEM), Scanning Transmission Electron Microscope (STEM), X-ray Diffraction (XRD), Energy-Dispersive X-ray Spectroscopy (EDS), X-ray Photoelectron Spectroscopy (XPS), and UV-vis Diffuse Reflectance Spectroscopy (DRS). The charge-carrier dynamics was studied by Time Resolved Microwave Conductivity (TRMC). The photocatalytic activity was evaluated for hydrogen generation under UV-vis irradiation using polychromatic and monochromatic lights (action spectra analysis of apparent quantum efficiency). TiO2 modified with Pd-Ni bimetallic NPs exhibits a high activity for H2 generation, and a synergetic effect of the two metals was obtained. The study of light absorption, charge-carrier dynamics, and photocatalytic activity revealed that the main role of the metal NPs is to act as catalytic sites for recombination of atomic hydrogen. (Chemical Equation Presented).
UR - http://www.scopus.com/inward/record.url?scp=85023190713&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.7b01167
DO - 10.1021/acs.jpcc.7b01167
M3 - Artículo
SN - 1932-7447
VL - 121
SP - 14302
EP - 14311
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 26
ER -