Stabilization of Si microwire arrays for solar-driven H 2O oxidation to O2(g) in 1.0 M KOH(aq) using conformal coatings of amorphous TiO2

Shaner, Matthew R.; Hu, Shu; Sun, Ke; Lewis, Nathan S.

doi:10.1039/c4ee03012e

Stabilization of Si microwire arrays for solar-driven H ₂O oxidation to O₂(g) in 1.0 M KOH(aq) using conformal coatings of amorphous TiO₂

Journal Article · Tue Nov 04 23:00:00 EST 2014 · Energy & Environmental Science

DOI:https://doi.org/10.1039/c4ee03012e· OSTI ID:1634095

Shaner, Matthew R. ^[1]; Hu, Shu ^[2]; Sun, Ke ^[2]; Lewis, Nathan S. ^[2]

California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP); California Institute of Technology, Pasadena, CA
California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP)

In this work, conductive, amorphous TiO₂ coatings deposited by atomic-layer deposition, in combination with a sputter deposited NiCrO_x oxygen-evolution catalyst, have been used to protect Si microwire arrays from passivation or corrosion in contact with aqueous electrolytes. Coated np⁺-Si/TiO₂/NiCrO_x as well as heterojunction n-Si/TiO₂/NiCrO_x 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 ~100% Faradaic efficiency for the evolution of O₂(g).

Research Organization:: California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: SC0004993

OSTI ID:: 1634095

Journal Information:: Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 1 Vol. 8; ISSN EESNBY; ISSN 1754-5692

Publisher:: Royal Society of Chemistry

Country of Publication:: United States

Language:: English

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Stabilization of Si microwire arrays for solar-driven H ₂O oxidation to O₂(g) in 1.0 M KOH(aq) using conformal coatings of amorphous TiO₂