Abstract
Photoelectrochemically (PEC) converting environmental pollutant nitrate back to valuable ammonia is a powerful complement to NH3 synthesis from Haber-Bosch process. Herein, atomic layer deposition (ALD) technique is employed to refine oxygen defect of TiO2 passivation layer on p-type silicon nanowire arrays to introduce active sites and improve the stability of silicon. [email protected]2-50-Vo nanowire arrays photocathode delivers a greatly enhanced NH3 yield rate of 1074 μgNH3 h−1 cm−2 and Faradaic efficiency (FE) of 94.3% at −0.6 V, as well as with excellent cycling stability. Theoretical calculations indicate that oxygen defect in passivation layer promotes the adsorption of nitrate and lowers the energy barrier of primary steps in NTRR.
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