Energy & Fuels,
Год журнала:
2024,
Номер
38(8), С. 6659 - 6678
Опубликована: Апрель 2, 2024
Equimolar
or
nearly
molar
mixtures
of
five
more
metals
are
used
to
create
high-entropy
oxides
(HEOs).
HEOs
also
possess
the
kinetic
slow
diffusion
effect,
structural
lattice
distortion,
thermodynamic
and
cocktail
effect.
Consequently,
a
growing
number
scientists
investigating
oxides.
High
active
site
density,
low
overpotential,
entropic
stabilization
effects
main
reasons
why
now
show
good
electrocatalytic
oxygen
evolution
reaction.
However,
complexity
elemental
composition,
organization,
surface
morphology
limits
use
HEOs.
The
development
mechanisms
behind
OER
reviewed
in
this
work,
along
with
description
response
pathways
evaluation
standards.
performance
diverse
organizational
structures
is
research
because
come
variety
kinds.
Additionally,
when
utilized
as
carriers,
trend
examined.
Lastly,
potential
future
problems
opportunities
for
HEO
electrocatalysts
discussed.
ACS Nano,
Год журнала:
2022,
Номер
16(6), С. 9095 - 9104
Опубликована: Июнь 3, 2022
Urea
electrosynthesis
provides
an
intriguing
strategy
to
improve
upon
the
conventional
urea
manufacturing
technique,
which
is
associated
with
high
energy
requirements
and
environmental
pollution.
However,
electrochemical
coupling
of
NO3–
CO2
in
H2O
prepare
under
ambient
conditions
still
a
major
challenge.
Herein,
self-supported
core–shell
Cu@Zn
nanowires
are
constructed
through
electroreduction
method
exhibit
superior
performance
toward
via
contaminants
as
feedstocks.
Both
1H
NMR
spectra
liquid
chromatography
identify
production.
The
optimized
yield
rate
Faradaic
efficiency
over
can
reach
7.29
μmol
cm–2
h–1
9.28%
at
−1.02
V
vs
RHE,
respectively.
reaction
pathway
revealed
based
on
intermediates
detected
situ
attenuated
total
reflection
Fourier
transform
infrared
spectroscopy
online
differential
mass
spectrometry.
combined
results
theoretical
calculations
experiments
prove
that
electron
transfer
from
Zn
shell
Cu
core
not
only
facilitate
formation
*CO
*NH2
but
also
promote
these
form
C–N
bonds,
leading
faradaic
product.
Energy Technology,
Год журнала:
2022,
Номер
10(11)
Опубликована: Сен. 8, 2022
Green
hydrogen
production
by
renewables‐powered
water
electrolysis
holds
the
key
to
energy
sustainability
and
a
carbon‐neutral
future.
The
sluggish
kinetics
of
water‐splitting
reactions,
namely,
evolution
reaction
(HER)
oxygen
(OER),
however,
remains
bottleneck
technology.
High‐entropy
materials,
due
their
compositional
flexibility,
structural
stability,
synergy
between
various
elemental
components,
have
recently
aroused
considerable
interest
in
catalyzing
reactions.
Herein,
timely
review
recent
achievements
is
provided
high‐entropy
materials
for
electrolysis.
An
overview
different
kinds
HER
OER
half‐reactions
introduced,
followed
discussion
theoretical
experimental
efforts
understanding
fundamental
origins
enhanced
catalytic
performance
observed
on
catalysts.
Various
design
strategies,
including
control
size
shape,
construction
porous
structure,
engineering
defect,
formation
hybrid/composite
develop
catalysts
with
improved
are
highlighted.
Finally,
remaining
challenges
pointed
out
corresponding
perspectives
address
these
put
forward
promote
development
research
field
Abstract
Oxygen
evolution
reaction
(OER)
is
a
key
half‐reaction
in
many
electrochemical
transformations,
and
efficient
electrocatalysts
are
critical
to
improve
its
kinetics
which
typically
sluggish
due
multielectron‐transfer
nature.
Perovskite
oxides
popular
category
of
OER
catalysts,
while
their
activity
remains
insufficient
under
the
conventional
adsorbate
scheme
where
scaling
relations
limit
enhancement.
The
lattice
oxygen‐mediated
mechanism
(LOM)
has
been
recently
reported
overcome
such
boost
catalysis
over
several
doped
perovskite
catalysts.
However,
direct
evidence
supporting
LOM
participation
still
very
little
because
doping
strategy
applied
would
introduce
additional
active
sites
that
may
mask
real
mechanism.
Herein,
dopant‐free,
cation
deficiency
manipulation
tailor
bulk
diffusion
properties
perovskites
without
affecting
surface
reported,
providing
perfect
platform
for
studying
contribution
catalysis.
Further
optimizing
A‐site
achieves
candidate
with
excellent
intrinsic
activity,
also
demonstrates
outstanding
performance
rechargeable
Zn–air
batteries
water
electrolyzers.
These
findings
not
only
corroborate
role
electrocatalysis,
but
provide
an
effective
way
rational
design
better
catalyst
materials
clean
energy
technologies.
Materials Reports Energy,
Год журнала:
2022,
Номер
2(3), С. 100144 - 100144
Опубликована: Июль 31, 2022
Electrochemical
water
splitting
powered
by
renewables-generated
electricity
represents
a
promising
approach
for
green
hydrogen
production.
However,
the
sluggish
kinetics
evolution
reaction
(HER)
under
an
alkaline
medium
causes
massive
amount
of
energy
losses,
hindering
large-scale
Exploring
efficient
and
low-cost
catalyst
candidates
H2
generation
becomes
crucial
demand.
Single-atom
catalysts
(SACs)
demonstrate
great
promise
enabling
HER
catalysis
at
maximum
atom
utilization
efficiency.
In
this
review,
we
provide
comprehensive
overview
recent
progress
in
SACs
application
environments.
The
fundamentals
are
first
introduced,
followed
justification
need
to
develop
SACs.
rational
design
including
inherent
element
property,
coordination
environment,
SAC
morphology,
mass
loading
highlighted.
To
facilitate
development
HER,
further
propose
remaining
challenges
perspectives
research
field.
Nature Communications,
Год журнала:
2023,
Номер
14(1)
Опубликована: Июль 14, 2023
Electrochemical
hydrogen
evolution
reaction
in
neutral
media
is
listed
as
the
most
difficult
challenges
of
energy
catalysis
due
to
sluggish
kinetics.
Herein,
Ir-HxWO3
catalyst
readily
synthesized
and
exhibits
enhanced
performance
for
reaction.
HxWO3
support
functioned
proton
sponge
create
a
local
acid-like
microenvironment
around
Ir
metal
sites
by
spontaneous
injection
protons
WO3,
evidenced
spectroscopy
electrochemical
analysis.
Rationalize
revitalized
lattice-hydrogen
species
located
interface
are
coupled
with
Had
atoms
on
metallic
surfaces
via
thermodynamically
favorable
Volmer-Tafel
steps,
thereby
fast
Elaborated
demonstrates
activity
low
overpotential
20
mV
at
10
mA
cm-2
Tafel
slope
28
dec-1,
which
even
comparable
those
acidic
environment.
The
concept
exemplified
this
work
offer
possibilities
tailoring
regulate
catalytic
pathway.
Nature Communications,
Год журнала:
2023,
Номер
14(1)
Опубликована: Март 31, 2023
Developing
robust
nonprecious-metal
electrocatalysts
with
high
activity
towards
sluggish
oxygen-evolution
reaction
is
paramount
for
large-scale
hydrogen
production
via
electrochemical
water
splitting.
Here
we
report
that
self-supported
laminate
composite
electrodes
composed
of
alternating
nanoporous
bimetallic
iron-cobalt
alloy/oxyhydroxide
and
cerium
oxynitride
(FeCo/CeO2-xNx)
heterolamellas
hold
great
promise
as
highly
efficient
alkaline
reaction.
By
virtue
three-dimensional
architecture
to
offer
abundant
accessible
electroactive
CoFeOOH/CeO2-xNx
heterostructure
interfaces
through
facilitating
electron
transfer
mass
transport,
FeCo/CeO2-xNx
exhibit
superior
electrocatalysis
in
1
M
KOH,
ultralow
Tafel
slope
~33
mV
dec-1.
At
overpotential
low
360
mV,
they
reach
>3900
mA
cm-2
retain
exceptional
stability
at
~1900
>1000
h,
outperforming
commercial
RuO2
some
representative
oxygen-evolution-reaction
catalysts
recently
reported.
These
properties
make
them
attractive
candidates
electrolysis
generation.
Abstract
Electrochemical
water
splitting
represents
a
promising
technology
for
green
hydrogen
production.
To
design
advanced
electrocatalysts,
it
is
crucial
to
identify
their
active
sites
and
interpret
the
relationship
between
structures
performance.
Materials
extensively
studied
as
electrocatalysts
include
noble‐metal‐based
(e.g.,
Ru,
Ir,
Pt)
non‐noble‐metal‐based
3d
transition
metals)
compounds.
Recently,
advancements
in
characterization
techniques
theoretical
calculations
have
revealed
novel
unusual
sites.
The
present
review
highlights
latest
achievements
discovery
identification
of
various
unconventional
electrochemical
splitting,
with
focus
on
state‐of‐the‐art
strategies
determining
true
establishing
structure–activity
relationships.
Furthermore,
we
discuss
remaining
challenges
future
perspectives
development
next‐generation
By
presenting
fresh
perspective
reaction
involved
this
aims
provide
valuable
guidance
study
industrial
applications.
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