Enhanced Charge Transport in Tantalum Nitride Nanotube Photoanodes for Solar Water Splitting.

ChemSusChem

PubMedID: 26195328

Wang L, Nguyen NT, Zhou X, Hwang I, Killian MS, Schmuki P. Enhanced Charge Transport in Tantalum Nitride Nanotube Photoanodes for Solar Water Splitting. ChemSusChem. 2015;.
In the present work we grow anodic self-organized Ta2 O5 nanotube layers, which are converted by ammonolysis to Ta3 N5 nanotubes, and then are used as photoanodes for photoanalytic water splitting. We introduce a two-step anodization process that not only improves order (reduced growth defects) and overall light absorption in the nanotube layers, but also provides a significantly reduced interface charge resistance at the nitride/metal interface due to subnitride (TaNx ) formation. As a result, such nanotube anodes afford a 15-fold increase of the photocurrent compared with conventional nanotubular Ta3 N5 electrodes under AM 1. 5 G simulated sunlight (100 mW?cm(-2) ) conditions.