Primary Corrosion Processes for Polymer-Embedded Free-Standing or Substrate-Supported Silicon Microwire Arrays in Aqueous Alkaline Electrolytes

Kathleen M. Kennedy, Paul Andrew Kempler, Miguel Cabán-Acevedo, Kimberly M. Papadantonakis, Nathan S. Lewis

Research output: Contribution to journalArticlepeer-review

Abstract

Solar fuel devices have shown promise as a sustainable source of chemical fuels. However, long-term stability of light absorbing materials remains a substantial barrier to practical devices. Herein, multiple corrosion pathways in 1 M KOH(aq) have been defined for TiO2-protected Si microwire arrays in a polymer membrane either attached to a substrate or free-standing. Top-down corrosion was observed in both morphologies through defects in the TiO2 coating. For the substrate-based samples, bottom-up corrosion was observed through the substrate and up the adjacent wires. In the free-standing samples, uniform bottom-up corrosion was observed through the membrane with all wire material corroded within 10 days of immersion in the dark in 1 M KOH(aq).

Original languageEnglish
Pages (from-to)1056-1061
Number of pages6
JournalNano letters
Volume21
Issue number2
DOIs
Publication statusPublished - Jan 27 2021

Keywords

  • corrosion
  • membrane-embedded
  • microwires
  • solar fuels

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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