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

Access to Document

10.1021/jp980679h

Fingerprint Dive into the research topics of 'Stabilization of Si photoanodes in aqueous electrolytes through surface alkylation'. Together they form a unique fingerprint.

Cite this

@article{87749e6f98ca47b7a5a71fb37d2e7051,

title = "Stabilization of Si photoanodes in aqueous electrolytes through surface alkylation",

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.",

author = "Ashish Bansal and Lewis, {Nathan S.}",

year = "1998",

month = may,

day = "21",

doi = "10.1021/jp980679h",

language = "English",

volume = "102",

pages = "4058--4060",

journal = "Journal of Physical Chemistry B",

issn = "1520-6106",

number = "21",

}

TY - JOUR

T1 - Stabilization of Si photoanodes in aqueous electrolytes through surface alkylation

AU - Bansal, Ashish

AU - Lewis, Nathan S.

PY - 1998/5/21

Y1 - 1998/5/21

N2 - 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.

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.

UR - http://www.scopus.com/inward/record.url?scp=0001767750&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001767750&partnerID=8YFLogxK

U2 - 10.1021/jp980679h

DO - 10.1021/jp980679h

M3 - Article

AN - SCOPUS:0001767750

VL - 102

SP - 4058

EP - 4060

JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

SN - 1520-6106

IS - 21

ER -

Stabilization of Si photoanodes in aqueous electrolytes through surface alkylation

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Cite this