Although photoelectrochemical synthesis of NH 3 is considered as an ecofriendly and sustainable process under ambient conditions, stable and highly efficient catalysts for the N 2 reduction reaction are still lacking because of the chemically inert nature of the triple bonds in elemental nitrogen and the competitive reaction of water reduction. In this paper, a photoelectrochemical N 2 reduction reaction route is proposed through combining black silicon and Ag nanoparticles using a simple deposition method. The synergetic effect of Ag nanoparticles and black Si significantly enhances the activity for the ammonia evolution reaction. The obtained Ag/bSi photocathode reaches a high Faraday efficiency of 40.6% and an NH 3 yield of 2.87 μmol h −1 cm −2 at −0.2 V versus the reversible hydrogen electrode in 0.1 M Na 2 SO 4 .

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Well-scattered g-C3N4 nanosheets obtained using a liquid stripping possess much higher photocatalytic performance than bulk g-C3N4.

Atom-dispersed Bi metal along the TiO2 nanorods is properly designed as an efficiency co-catalyst to boost the photoelectrochemical (PEC) water splitting with a three-fold enhancement on photocurrent density.

An MoSx/g-C3N4 composite photocatalyst was successfully fabricated by a sonochemical approach, where amorphous MoSx was synthesized using a hydrothermal method, and g-C3N4 nanosheets were produced using a two-step thermal polycondensation method.