High performance and toxicity assessment of Ta3N5 nanotubes for photoelectrochemical water splitting. - Xu, Kaiqi; Chatzitakis, Athanasios; Risbakk, Sanne; Yang, Mingyi; Backe, Paul Hoff; Grandcolas, Mathieu; Bjørås, Magnar; Norby, Truls (Catalysis Today, 2021)