Small,
Journal Year:
2022,
Volume and Issue:
19(5)
Published: Nov. 29, 2022
Layered
double-hydroxide
(LDH)
has
been
considered
an
important
class
of
electrocatalysts
for
the
oxygen
evolution
reaction
(OER),
but
adsorption-desorption
behaviors
intermediates
on
its
surface
still
remain
unsatisfactory.
Apart
from
transition-metal
doping
to
solve
this
electrocatalytic
problem
LDH,
rare-earth
(RE)
species
have
sprung
up
as
emerging
dopants
owing
their
unique
4f
valence-electronic
configurations.
Herein,
Er
is
chosen
a
RE
model
improve
OER
activity
LDH
via
constructing
nickel
foam
supported
Er-doped
NiFe-LDH
catalyst
(Er-NiFe-LDH@NF).
The
optimal
Er-NiFe-LDH@NF
exhibits
low
overpotential
(191
mV
at
10
mA
cm-2
),
high
turnover
frequency
(0.588
s-1
and
activation
energy
(36.03
kJ
mol-1
which
are
superior
Er-free
sample.
Electrochemical
in
situ
Raman
spectra
reveal
facilitated
transition
Ni-OH
into
Ni-OOH
promoted
kinetics
through
effect.
Theoretical
calculations
demonstrate
that
introduction
facilitates
spin
crossover
valence
electrons
by
optimizing
d
band
center
NiFe-LDH,
leads
GO
-GHO
closer
kinetic
volcano
balancing
bonding
strength
*O
*OH.
Moreover,
presents
practicability
electrochemical
water-splitting
devices
with
driving
potential
well-extended
period.
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: April 4, 2023
Rational
design
efficient
transition
metal-based
electrocatalysts
for
oxygen
evolution
reaction
(OER)
is
critical
water
splitting.
However,
industrial
water-alkali
electrolysis
requires
large
current
densities
at
low
overpotentials,
always
limited
by
intrinsic
activity.
Herein,
we
report
hierarchical
bimetal
nitride/hydroxide
(NiMoN/NiFe
LDH)
array
as
model
catalyst,
regulating
the
electronic
states
and
tracking
relationship
of
structure-activity.
As-activated
NiMoN/NiFe
LDH
exhibits
industrially
required
density
1000
mA
cm-2
overpotential
266
mV
with
250
h
stability
OER.
Especially,
in-situ
electrochemical
spectroscopic
reveals
that
heterointerface
facilitates
dynamic
structure
to
optimize
structure.
Operando
impedance
spectroscopy
implies
accelerated
OER
kinetics
intermediate
due
fast
charge
transport.
The
mechanism
revealed
combination
theoretical
experimental
studies,
indicating
as-activated
follows
lattice
oxidation
kinetics.
This
work
paves
an
avenue
develop
catalysts
via
tuning
states.
Advanced Energy Materials,
Journal Year:
2022,
Volume and Issue:
12(14)
Published: Jan. 24, 2022
Abstract
Designing
a
stable
and
efficient
dual‐functional
catalyst
for
the
hydrogen
evolution
oxygen
reactions
(HER/OER)
is
of
great
significance
to
development
production
by
water
splitting.
This
work
reports
on
novel
halogen
(X
=
F,
Cl,
Br)‐doped
carbon
dots
modifying
amorphous
cobalt
phosphide
(X‐CDs/CoP),
which
can
be
tuned
choice
X‐CDs
have
urchin,
Pinus
bungeana
,
Albizia
julibrissin
type
structures.
The
different
characteristics
various
led
formation
mechanisms
final
As
bifunctional
catalyst,
urchin‐shaped
F‐CDs/CoP
crystals
achieve
superior
electrocatalytic
performance,
exhibiting
excellent
HER/OER
activity
sustained
stability
in
an
alkaline
solution.
For
overall
splitting,
they
provide
current
density
10
mA
cm
−2
require
low
cell
voltage
1.48
V
1
M
KOH.
In
addition,
catalytic
performance
shows
negligible
degradation
after
100
h,
thus
demonstrating
long‐term
cycling
stability.
Density
functional
theory
calculations
show
that
improved
catalysts
due
coupling
interface
between
CoP
F‐CDs,
optimizes
hydrogen/oxygen
adsorption
energy
accelerates
splitting
kinetics.
provides
guidance
rational
design
transition
metal
electrocatalysts
with
outstanding
performance.
Energy & Environmental Science,
Journal Year:
2022,
Volume and Issue:
15(6), P. 2356 - 2365
Published: Jan. 1, 2022
An
electron-feeding
modulation
strategy
is
developed
to
stabilize
the
highly
active
ruthenium
site
and
strengthen
adsorption
of
OH*
intermediate
toward
sustainable
acidic
water
electrolysis.
InfoMat,
Journal Year:
2022,
Volume and Issue:
4(9)
Published: Aug. 23, 2022
Abstract
Developing
new
methodologies
to
produce
clean
and
renewable
energy
resources
is
pivotal
for
carbon‐neutral
initiatives.
Hydrogen
(H
2
)
considered
as
an
ideal
resource
due
its
nontoxic,
pollution‐free,
high
utilization
rate,
calorific
combustion
value.
Electrolysis
of
water
driven
by
the
electricity
generated
from
sources
(e.g.,
solar
energy,
wind
energy)
hydrogen
attracts
great
efforts
production
with
purity.
Recently,
breakthrough
catalyst
activity
limit
evolution
reaction
(HER)
catalysts
has
received
extensive
attention.
Comparatively,
fewer
reviews
have
focused
on
long‐term
stability
HER
catalysts,
which
indeed
decisive
large‐scale
electrolytic
industrialization.
Therefore,
a
systematic
summary
concentrated
durability
electrocatalysts
would
provide
fundamental
understanding
electrocatalytic
performance
practical
applications
offer
opportunities
rational
design
highly
performed
electrocatalysts.
This
review
summarizes
research
progress
toward
precious
metals,
transition
metal‐free
in
past
few
years.
It
discusses
challenges
future
perspectives.
We
anticipate
that
it
valuable
basis
designing
robust
image
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: March 31, 2023
Catalysts
capable
of
electrochemical
overall
water
splitting
in
acidic,
neutral,
and
alkaline
solution
are
important
materials.
This
work
develops
bifunctional
catalysts
with
single
atom
active
sites
through
a
pyrolysis-free
route.
Starting
conjugated
framework
containing
Fe
sites,
the
addition
Ni
atoms
is
used
to
weaken
adsorption
electrochemically
generated
intermediates,
thus
leading
more
optimized
energy
level
sand
enhanced
catalytic
performance.
The
synthesis
also
ensured
formation
well-defined
within
structure,
providing
ideal
platforms
understand
processes.
as-prepared
catalyst
exhibits
efficient
capability
for
both
acidic
electrolytes.
At
current
density
10
mA
cm-2,
overpotential
hydrogen
evolution
oxygen
23/201
mV
42/194
0.5
M
H2SO4
1
KOH,
respectively.
Our
not
only
route
towards
applicable
across
wide
range
pH
values,
it
provides
successful
showcase
model
in-depth
mechanistic
insight
into
splitting.
Advanced Materials,
Journal Year:
2022,
Volume and Issue:
34(12)
Published: Jan. 11, 2022
Rational
exploration
of
efficient,
inexpensive,
and
robust
electrocatalysts
is
critical
for
the
efficient
water
splitting.
Conjugated
conductive
metal-organic
frameworks
(cMOFs)
with
multicomponent
layered
double
hydroxides
(LDHs)
to
construct
bifunctional
heterostructure
catalysts
are
considered
as
an
but
complicated
strategy.
Here,
fabrication
a
cMOF/LDH
hetero-nanotree
array
catalyst
(CoNiRu-NT)
coupled
monodispersed
ruthenium
(Ru)
sites
via
controllable
grafted-growth
strategy
reported.
Rich-amino
hexaiminotriphenylene
linkers
coordinate
LDH
nanotrunk
form
cMOF
nanobranches,
providing
numerous
anchoring
precisely
confine
stabilize
RuN4
sites.
Moreover,
reduced
Ru
moieties
facilitate
H2
O
adsorption
dissociation,
heterointerface
between
further
modifies
chemical
electronic
structures.
Optimized
CoNiRu-NT
displays
significant
increase
in
electrochemical
water-splitting
properties
alkaline
media,
affording
low
overpotentials
22
mV
at
10
mA
cm-2
255
20
hydrogen
evolution
reaction
oxygen
reaction,
respectively.
In
actual
system,
drives
overall
splitting
cell
voltage
1.47
V
reach
.
This
performance
comparable
that
pure
noble-metal-based
materials
superior
most
reported
MOF-based
catalysts.
