Stabilization of Si photoanodes in aqueous electrolytes through surface alkylation

Ashish Bansal; Nathan S. Lewis

doi:10.1021/jp980679h

Stabilization of Si photoanodes in aqueous electrolytes through surface alkylation

Ashish Bansal, Nathan S. Lewis

California Institute of Technology

Research output: Contribution to journal › Article

128 Citations (Scopus)

Abstract

A two-step chlorination/alkylation method was used to introduce -C_nH_2n+1 (n = 1-6) functionality onto single-crystal, (111)-oriented, n-type Si surfaces. H-terminated Si photoanodes were unstable under illumination in contact with an aqueous 0.35 M K₄Fe(CN)₆-0.05 M K₃Fe(CN)₆ electrolyte. Such electrodes displayed low open-circuit voltages and exhibited a pronounced time-dependent deterioration in their current density vs potential characteristics due to anodic oxidation. In contrast, Si surfaces functionalized with -CH₃ and -C₂H₅ groups displayed significant improvements in stability while displaying excellent electrochemical properties when used as photoelectrodes in the aqueous Fe(CN)₆^3-/4- electrolyte.

Original language	English
Pages (from-to)	4058-4060
Number of pages	3
Journal	Journal of Physical Chemistry B
Volume	102
Issue number	21
DOIs	https://doi.org/10.1021/jp980679h
Publication status	Published - May 21 1998

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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Bansal, A., & Lewis, N. S. (1998). Stabilization of Si photoanodes in aqueous electrolytes through surface alkylation. Journal of Physical Chemistry B, 102(21), 4058-4060. https://doi.org/10.1021/jp980679h

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