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 › peer-review

130 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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abstract = "A two-step chlorination/alkylation method was used to introduce -CnH2n+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)63-/4- electrolyte.",

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AU - Bansal, Ashish

AU - Lewis, Nathan S.

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AB - A two-step chlorination/alkylation method was used to introduce -CnH2n+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)63-/4- electrolyte.

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