Direct Z-scheme among Niobium Pentoxide and Poly(heptazine imide) for NH3 Photoelectrosynthesis under Ambient Conditions

There is a crescent need to improve well-known processes to environmentally friendly options, and NH3 production is not an exception. Herein, we describe the photoelectrochemical nitrogen reduction reaction under a carbon nitride, the poly(heptazine imide) (PHI) using mild conditions for NH3 synthesis. For this purpose, PHI was combined with Nb2O5 nanotubes, leading to a new photocathode with a charge transfer process in a Z-scheme structure. The photoelectrocatalytic N-2 reduction was carried out in Nb(2)O(5)Nt/PHI using solar-simulated radiation and with an applied bias of -0.3 V-Ag/AgCl. The PHI presence in the photocathode showed not only superior stability compared to bare Nb2O5, but also an ammonia generation rate of 0.156 mmol L-1 h(-1) cm(-2), which is about 10-fold higher than the amount obtained with niobium oxide alone. The mild and green conditions employed for ammonia generation place the obtained photocathode as a promising option for the currently used Haber-Bosch process.