Stabilization of Si microwire arrays for solar-driven H2O oxidation to O-2(g) in 1.0 M KOH(aq) using conformal coatings of amorphous TiO2

作者：Shaner Matthew R^*; Hu Shu; Sun Ke; Lewis Nathan S

来源：Energy & Environmental Science, 2015, 8(1): 203-207.

DOI：10.1039/c4ee03012e

Conductive, amorphous TiO2 coatings deposited by atomic-layer deposition, in combination with a sputter deposited NiCrOx oxygen-evolution catalyst, have been used to protect Si microwire arrays from passivation or corrosion in contact with aqueous electrolytes. Coated np(+)-Si/TiO2/NiCrOx as well as heterojunction n-Si/TiO2/NiCrOx Si microwire-array photoanodes exhibited stable photoelectrochemical operation in aqueous ferri-/ferro-cyanide solutions. The coatings also allowed for photoanodic water oxidation in 1.0 M KOH(aq) solutions for >2200 h of continuous operation under simulated 1 Sun conditions with similar to 100% Faradaic efficiency for the evolution of O-2(g).

• 出版日期2015