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Photoelectrochemical and photocatalytic investigation of semiconducting iron oxide for solar...
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Photoelectrochemical and photocatalytic investigation of semiconducting iron oxide for solar energy conversion
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http://www.ohsu.edu/xd/education/library/services/theses-dissertations/rights-statement.cfm
Title
Photoelectrochemical
and
photocatalytic
investigation
of
semiconducting
iron
oxide
for
solar
energy
conversion
Creator.PersonalName
Strasik
,
Michael
Thesis.Degree
Ph.D.
Thesis.Major
Materials Science and Engineering
Thesis.DateDegreeAwarded
May
1988
Institution
Oregon Graduate Center
Department
Dept. of Materials Science and Engineering
Thesis.Advisor/Mentor
Eror, Nicholas G.
Thesis.Committee
Devletian, Jack H.
Shankar, S.
Bell, Anthony E.
Subject.LCSH
Metal oxide semiconductors
Solar energy -- Materials
Photochemistry -- Industrial applications
Call Number
Q183.5.OGC S782 1988
Description.Abstract
Well
characterized
and
reproducible
semiconducting
Fe2O3
was
prepared
by
freeze-drying
. This
technique
produced
very
homogeneously
Si
,
Mg
, or
Pt
doped
semiconducting
Fe2O3
that was
used
successfully
in the
photoelectrochemical
and
photocatalytic
solar
cell
for the
production
of
gaseous
hydrogen
and
oxygen
by
dissociating
water
.
Photocurrents
obtained
with the
photoelectrodes
prepared
from the
freeze-dried
samples
were
more
stable
and
up
to
ten
times
higher
than with the
samples
prepared
by the
conventional
solid
state
mixing
technique
. The
maximum
photocurrent
density
obtained
with the
freeze-dried
samples
was
10
mA/cm2
at
0.8
V
vs
SCE
for the
0.1
at.%
Si
+
5
at.%
Pt
doped
Fe2O3
. The
photocurrent
also
increased
with
increasing
amounts
of
platinum
. The
added
platinum
was
shown
to have
several
beneficial
effects
on the
n-type
and
p-type
photoelectrodes
. In the
Si
doped
n-type
semiconductor
the
platinum
increased
the
carrier
concentration
via
a
shallow
donor
level
within
the
bandgap
.
It
was also
shown
that the
platinum
enhanced
the
probabilities
of
electron
exchange
and
increased
the
reaction
kinetics
between
the
electrode
and
electrolyte
species
. The
efficiency
of the
photoelectrochemical
reactions
was
increased
with
added
platinum
by
eliminating
the
transient
currents
. In the
cyclic
voltammetry
experiments
it
was
shown
that the
platinum
in the
n-type
semiconductor
at
negative
potentials
acts
as a
local
cathode
and
enhances
the
production
of
hydrogen
. In the
p-type
Fe2O3
, the
platinum
acts
as an
electrocatalyst
and
lowers
the
overpotential
for
hydrogen
reduction
. A
p/n
heterojunction
was
used
in the
photoelectrochemical
solar
cell
to
photodissociate
water
into
oxygen
and
hydrogen
with
visible
light
. This
important
result
was
further
improved
by
using
Fe2O3
electrodes
prepared
by
freeze-drying
and by the
addition
of
platinum
. The
photogeneration
of
oxygen
was also
achieved
in the
photocatalytic
solar
cell
by
irradiating
doped
and
platinized
Fe2O3
in the
presence
of an
electron
scavenger
. The
Fe2O3
was
found
to be
stable
against
photocorrosion
for
extended
periods
of
illumination
and
photocurrent
generation
in a
basic
electrolyte
.
It
was
shown
that
doped
and
platinized
freeze-dried
Fe2O3
can
be
used
more
efficiently
than the
Fe2O3
prepared
by the
solid
state
technique
in the
photoelectrochemical
and
photocatalytic
cell
for the
gaseous
fuel
generation
using
solar
energy
.
Language
eng
Type
Text
Format.Use
Needs Adobe Acrobat Reader to view.
Format.FileType
pdf
Format.FileSize
6329.904 KB
OCLC number
19245494
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