Applying alloyed metal nanoparticles to enhance solar assisted water splitting

Naimeh Naseri, Parvaneh Sangpour, S. Hossein Mousavi

Research output: Contribution to journalArticleResearchpeer-review

22 Citations (Scopus)

Abstract

Considering hydrogen as a future fuel, development of clean approaches based on solar energy conversion is the main human challenge. Here, for the first time, TiO2 photoanodes are decorated with Au-Ag alloy nanoparticles for efficient photoelectrochemical water splitting. The photoanodes were synthesized using a one-step co-sputtering method. The single surface plasmon resonance peak at 540 nm and also the observed shifts in photoelectron binding energies are fingerprints of homogenous alloyed nanoparticles. Scanning electron microscopy revealed the formation of nearly 40 nm particles on the surface, which was also verified by the simulation of the film's optical absorption. Photocurrent measurements showed a 30% increase in the presence of alloy nanoparticles, as well as a 50% reduction in charge transfer resistance of the electrodes. These observations are attributed to adjusting a suitable Schottky barrier in the junction of TiO2/metal particles, which introduces applying alloy noble metallic particles as a new effective strategy for energy and environmental purposes.

Original languageEnglish
Pages (from-to)46697-46703
Number of pages7
JournalRSC Advances
Volume4
Issue number87
DOIs
Publication statusPublished - 2014
Externally publishedYes

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