ACS Sustainable Chemistry & Engineering,
Год журнала:
2024,
Номер
12(32), С. 12101 - 12112
Опубликована: Авг. 2, 2024
Surface
reconstruction
generates
genuine
active
phases
under
an
electrochemical
oxygen
evolution
reaction
(OER);
however,
most
OER
catalysts
exhibit
slow
self-reconstruction
due
to
their
relative
stability
in
electrochemistry.
Therefore,
it
is
highly
essential
rationally
design
precatalysts
capable
of
rapidly
generating
more
species.
Herein,
a
novel
reconfigurable
Te-doped
NiFe
layered
double
hydroxide
(Te-NiFe
LDH/NF)
precatalyst
prepared,
which
exhibits
ultrafast
and
in-depth
self-reconstruction,
significantly
enhancing
the
activity
for
step.
By
employing
various
in/ex
situ
techniques
theoretical
calculations,
distinctive
structure
Te-NiFe
LDH/NF
along
with
alkaline
electrolyte
are
identified
as
pivotal
factors
facilitating
phase
transition.
The
presence
Te
cations
can
effectively
reduce
energy
barrier,
thereby
providing
feasibility
continuous
reconstruction,
while
supplies
complement
OH–
form
oxyhydroxides.
Besides,
doped
into
NiFeOxHy
lattice
(Te-NiFeOxHy/NF),
leading
optimized
binding
energies
intermediates
reduced
barriers
rate-determining
step
(RDS),
ultimately
performance.
As
such,
self-restructured
Te-NiFeOxHy/NF
only
required
208
310
mV
achieve
10
500
mA
cm–2,
respectively,
together
high
current
300
h.
This
study
provides
rational
strategy
develop
efficient
electrocatalysts
through
surface
reconstruction.
Abstract
Developing
non‐precious‐metal
electrocatalysts
that
can
operate
with
a
low
overpotential
at
high
current
density
for
industrial
application
is
challenging.
Heterogeneous
bimetallic
phosphides
have
attracted
much
interest.
Despite
hydrogen
evolution
reaction
(HER)
performance,
the
ordinary
oxygen
(OER)
performance
hinders
their
practical
use.
Herein,
it
shown
Fe‐doping
reverses
and
enlarges
interfacial
electrical
field
heterojunction,
turning
H
intermediate
favorable
binding
sites
HER
into
O
OER.
Specifically,
self‐supported
heterojunction
catalysts
on
nickel
foam
(CoP@Ni
2
P/NF
Fe‐CoP@Fe‐Ni
P/NF)
are
readily
synthesized.
They
only
require
overpotentials
of
266
274
mV
to
drive
large
1000
mA
cm
−2
(
j
)
OER,
respectively.
Furthermore,
water
splitting
cell
equipped
these
electrodes
requires
voltage
1.724
V
excellent
durability,
demonstrating
potential
application.
This
work
offers
new
insights
engineering
catalysts.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2024,
Номер
12(2), С. 998 - 1006
Опубликована: Янв. 3, 2024
Urea-assisted
water
electrolysis
integrated
by
a
urea
oxidation
reaction
(UOR)
and
hydrogen
evolution
(HER)
is
an
efficient
strategy
for
energy-saving
production.
However,
its
practical
application
requires
catalysts
with
sufficient
durability
high-strength
reactant/product
diffusion
capability
under
large
current
densities.
Herein,
the
Co0.5NiS2–Ni3S2
coral-like
nanorods
(Co0.5NiS2–Ni3S2/NF)
of
electronic
structure
morphology
regulation
are
rationally
constructed.
The
heterostructure
sulfur
vacancies
induce
interfacial
charge
redistribution,
thus
promoting
adsorption
*OH
intermediates,
accompanied
accelerating
dissociation
H2O.
Moreover,
hierarchical
nanorod
ensures
mass
transfer
gas
product
rapid
escape.
As
result,
Co0.5NiS2–Ni3S2/NF
only
takes
1.45
V
−345
mV
to
reach
densities
±1500
mA
cm–2
UOR
HER,
respectively.
Notably,
overall
system
needs
2.00
obtain
1500
cm–2,
it
can
operate
stably
120
h
at
500
cm–2.
This
work
illustrates
importance
regulating
energy
intermediates
design
advanced
energy-efficient
H2
production
from
electrolysis.
Journal of Colloid and Interface Science,
Год журнала:
2024,
Номер
666, С. 403 - 415
Опубликована: Март 30, 2024
Transition
metal
phosphides
have
been
demonstrated
to
be
promising
non-noble
catalysts
for
water
splitting,
yet
their
electrocatalytic
performance
is
impeded
by
unfavorable
free
energies
of
adsorbed
intermediates.
The
achievement
nanoscale
modulation
in
morphology
and
electronic
states
imperative
enhancing
intrinsic
activity.
Herein,
we
propose
a
strategy
expedite
the
splitting
process
over
NiCoP/FeNiCoP
hollow
ellipsoids
modulating
structure
d-band
center.
These
unique
phosphorus
(P)
vacancies-rich
are
synthesized
through
an
ion-exchange
reaction
between
uniform
NiCo-nanoprisms
K
