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The use of hot electrons generated from the decay of surface plasmons is anew paradigm to increase the conversion yield in solar energy technologies.Titanium nitride (TiN) is an emerging plasmonic ceramic that offerscompatibility with CMOS technology, corrosion resistance, as well as mechanicalstrength and durability thus outperforming noble metals (i.e., Au, Ag) in termsof cost, mechanical, chemical and thermal stability. Here, we show thatplasmonic TiN nanoparticles produce 25% higher photocurrent enhancement than Aunanoparticles decorated on TiO2 nanowires for photoelectrochemical watersplitting. Our results highlight that TiN offers superior performance in hotcarrier generation due to enhanced absorption efficiency, increased electronmean free path, and the ability to form an Ohmic junction with TiO2, thusenabling an extremely efficient electron collection not achievable withplasmonic Au nanoparticles. Our findings show that transition metal nitridesenable practical plasmonic devices with enhanced performance for solar energyconversion.

Enhancing Hot Carrier Collection for Solar Water Splitting with Plasmonic Titanium Nitride