Nickel
hydroxide
(Ni(OH)2)
is
considered
to
be
one
of
the
most
promising
electrocatalysts
for
urea
oxidation
reaction
(UOR)
under
alkaline
conditions
due
its
flexible
structure,
wide
composition
and
abundant
3D
electrons.
However,
slow
electrochemical
rate,
high
affinity
intermediate
*COOH,
easy
exposure
low
exponential
crystal
faces
limited
metal
active
sites
that
seriously
hinder
further
improvement
UOR
activities.
Herein
it
reported
electrocatalyst
composed
rich
oxygen-vacancy
(Ov)
defects
with
amorphous
SeOx-covered
Ni(OH)2
(Ov-SeOx/Ni(OH)2).
Surprisingly,
at
100
mA
cm-2,
compared
(1.46
V
(vs
RHE)),
Ov-SeOx/Ni(OH)2
has
a
potential
1.35
V.
Meanwhile,
catalyst
also
showed
good
hydrogen
evolution
(HER)
performance,
so
used
as
electrolytic
cell
assembled
by
HER
bifunctional
catalysts
only
1.57
could
reach
cm-2.
Density
functional
theory
(DFT)
study
revealed
introduce
SeOx
optimizes
electronic
structure
central
metal,
amorphous/crystalline
interfaces
promote
charge-carrier
transfer,
shift
d-band
center
entail
numerous
spin-polarized
electrons
during
reaction,
which
speeds
up
kinetics.
Materials Today Catalysis,
Год журнала:
2024,
Номер
4, С. 100039 - 100039
Опубликована: Янв. 17, 2024
Electrocatalysis
plays
a
crucial
role
in
the
conversion
and
storage
of
renewable
energy,
offering
significant
potential
for
addressing
energy
crisis
environmental
concerns.
High-entropy
oxides
(HEOs),
class
emerging
functional
materials,
have
gained
increasing
attention
electrocatalysis
due
to
their
stable
crystal
structure,
exceptional
geometric
compatibility,
unique
electronic
balance
factors,
abundant
active
sites.
In
this
comprehensive
review,
we
present
recent
advancements
utilizing
HEOs
as
catalysts
various
energy-based
electrocatalytic
reactions.
We
begin
with
an
overview
that
includes
definitions,
fundamental
properties,
theoretical
investigations.
Subsequently,
describe
different
synthetic
methods
while
highlighting
two
newly-developed
techniques.
Furthermore,
extensively
discuss
developments
HEO-based
electrocatalysts
diverse
structures
such
rock-salt-type,
rutile-type,
spinel-type,
perovskite-type,
other
specially-structured
HEOs.
Special
emphasis
is
placed
on
designed
strategies
aimed
at
enhancing
performance
exploring
correlations
between
structure/
composition
performance.
Finally,
provide
concluding
remarks
along
perspectives
future
opportunities
exciting
field.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(13), С. 16062 - 16074
Опубликована: Март 25, 2024
Efficient
charge
transfer
and
light-trapping
units
are
pivotal
prerequisites
in
the
realm
of
Ti-based
photoanode
photoelectrochemical
(PEC)
water
splitting.
In
this
work,
we
successfully
synthesized
a
ternary
carbon
quantum
dots/Bi2S3
dots/Nb-doped
TiO2
nanotube
arrays
(CQDs/Bi2S3/TiNbO)
composite
for
PEC
CQDs/Bi2S3/TiNbO
exhibited
considerably
elevated
photocurrent
density
8.80
mA
cm–2
at
1.23
V
vs
reversible
hydrogen
electrode,
which
was
20.00
times
better
than
that
(0.44
cm–2).
Furthermore,
attested
to
exceptional
stability,
maintaining
92.54%
its
initial
current
after
5
h
stability
measurement.
Nb-doping
boosted
electrical
conductivity,
facilitating
solid–liquid
interface.
Moderate
amounts
Bi2S3
dots
(QDs)
CQDs
deposited
on
TiNbO
provided
abundant
active
sites
electrolyte–photoanode
interaction.
Simultaneously,
QDs
synergistically
functioned
as
broaden
light
absorption
range
from
396
530
nm,
stimulating
increased
carrier
generation
within
photoanode.
comparison
with
pristine
TiO,
photoanodes
possessed
superior
ability
promote
interfacial
reactions.
This
study
may
provide
strategy
developing
high-performance
efficient
trapping
highly
driving
solar-to-hydrogen
conversion.
