Fabrication of vertical orthorhombic/hexagonal tungsten oxide phase junction with high photocatalytic performance

Abstract

The common one dimensional (1D) core-shell phase junction usually cannot fully utilize the separated charges because one phase is encapsulated inside, which leads to the incomplete release of the electrons or holes. Here, a unique vertical 1D/1D tungsten oxide phase junction constructed by orthorhombic WO 3 •0.33H 2 O (o-WO 3 •0.33H 2 O) nanorods and hexagonal WO 3 (h-WO 3) nanowires in the sunflower-like structure was fabricated via a facile one-step hydrothermal method. The nanorods and the nanowires vertically intersect at the endpoint to construct the vertical 1D/1D phase junction with another end exposed outside. This structure ensures that both two phases can contact the pollutants, so as to fully release the holes and electrons that accumulate on the o-WO 3 •0.33H 2 O and h-WO 3 phase, respectively. Furthermore, the two phases are both single crystals, substantially decreasing the impediments of defects to the transport of the photogenerated charges. This novel

Strategies for Efficient Charge Separation and Transfer in Artificial Photosynthesis of Solar Fuels

“…The concept of phase junction for efficient CST was also proven in semiconductors other than TiO 2 . For example, orthorhombic/hexagonal (o/h) and monoclinic/hexagonal (m/h) phase junctions of WO 3 exhibited enhanced photocatalytic water‐oxidation activities because of efficient charge separation between the different phases. Tailored α/β‐phase junction of Ga 2 O 3 even showed much better photocatalytic water‐splitting activity compared to the individual α‐ or β‐phase Ga 2 O 3 …”

3D Urchin-Like CuO Modified W18O49 Nanostructures for Promoted Photocatalytic Hydrogen Evolution under Visible Light Irradiation

“…Tungsten oxide (WO 3 ) with a band gap of 2.5–2.8 eV is considered as an attractive n-type visible light active photocatalyst [ 4 , 5 ]. In addition, it’s also well known for its non-stoichiometric properties, as its lattice can withstand a considerable number of oxygen vacancies, and many secondary oxides (WO x <3 ) such as WO 2.9 , WO 2.83 , WO 2.72 etc.…”

Valorización de residuos nanoestructuraods (nanoresiduos) provenientes del proceso HFCVD-CSVT: Uso como materiales adsorbentes, fotocatalíticos y para la oxidación catalítica del hollín

“…b) Por un proceso hidrotermal se han sintetizado nanoerizos ensamblando nanorodillos de WO 3 para sensar etanol gaseoso [21]. También se han obtenido estructuras en forma de girasol constituidas por nanoalambres y nanorodillos de WO 3 y WO 3 *0.33H 2 0, los cuales se han utilizado para la fotodegradación de Rodamina B [22]. c) Mediante un proceso asistido por ácido en un recipiente se prepararon nanohojas ultradelgadas de WO 3-X /C con la finalidad de usarse como ánodos en baterías de iones de litio [23].…”