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High-efficient photoelectrochemical synthesis of ammonia using plasmon-enhanced black silicon under ambient conditions.

Although photoelectrochemical synthesis of NH3 is considered as an eco-friendly and sustainable process under ambient conditions, stable and highly efficient catalysts for the N2 reduction reaction are still lacking due to the chemical inert nature of triple bond in elemental nitrogen and competitive reaction of water reduction. In this paper, a photoelectrochemical N2 reduction reaction route is proposed through combining black silicon and Ag nanoparticles by a simple deposition method. The synergetic effect of Ag nanoparticles and black Si significantly enhances the activity for ammonia evolution reaction. The obtained Ag/bSi photocathode attains a high Faraday efficiency of 40.6% and an NH3 yield of 2.87 μmol h-1 cm-2 at -0.2 V vs. reversible hydrogen electrode in 0.1 M Na2SO4.