RESUMO

This work describes a synthetic method to produce a WO(3) nanowire as well as to prepare photoanodes by colloidal nanowire deposition. We also studied the influence of a nanowire phase on the photoanode performance for water splitting. Among the nanowires synthesized by using nonhydrolytic media, the orthorhombic WO(3)·H(2) O nanowire produced a photoanode with excellent performance (a photocurrent of 1.96 mA cm(-2) at 1.23 V(RHE) ) and good photocurrent stability during long-term analysis (chronoamperometry test). The structural and photoelectrochemical characterization showed the importance of nanostructural features such as exposed (200), (020), and (002) facets and porosity in the WO(3) photoanode performance.

Assuntos

Eletroquímica/métodos , Nanofios/química , Óxidos/química , Energia Solar , Tungstênio/química , Água/química , Coloides , Eletrodos , Microscopia Eletrônica de Transmissão , Processos Fotoquímicos , Porosidade , Propriedades de Superfície