Catalysts,
Journal Year:
2024,
Volume and Issue:
14(8), P. 491 - 491
Published: July 31, 2024
Tuning
the
chemical
and
structural
environment
of
Ru-based
nanomaterials
is
a
major
challenge
for
achieving
active
stable
hydrogen
evolution
reaction
(HER)
electrocatalysis.
Here,
we
anchored
ultrafine
Ru
nanoparticles
(with
size
~4.2
nm)
on
hierarchical
Ni2P
array
(Ru/Ni2P)
to
enable
highly
efficient
HER.
The
promoter
weakened
adsorption
proton
sites
by
accepting
electrons
from
nanoparticles.
Moreover,
endowed
catalysts
with
large
surface
area
open
structure.
Consequently,
as-fabricated
Ru/Ni2P
electrode
displayed
low
overpotential
57
164
mV
at
HER
current
densities
10
50
mA
cm−2,
respectively,
comparable
state-of-the-art
Pt
catalysts.
can
operate
stably
96
h
cm−2
without
performance
degradation.
After
pairing
commercial
RuO2
anode,
anode
catalyzed
overall
water
splitting
1.73
V
density
which
was
0.16
lower
than
its
Ni
counterpart.
In
situ
Raman
studies
further
revealed
optimized
Ru-active
promoter,
thus
enhancing
electrocatalytic
performance.
Energy & environment materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 23, 2025
An
in‐depth
understanding
of
the
catalyst
surface
evolution
is
crucial
for
precise
control
active
sites,
yet
this
aspect
has
often
been
overlooked.
This
study
reveals
spontaneous
anion
regulation
mechanism
Br‐doped
CoP
electrocatalysts
in
alkaline
hydrogen
reaction
(HER)
and
oxygen
(OER).
The
introduction
Br
modulates
electronic
structure
Co
site,
endowing
Br‐CoP
with
a
more
metallic
character.
In
addition,
P
ion
leaching
promotes
situ
reconstruction
Br‐CoOOH,
which
real
site
OER
reaction.
Meanwhile,
HER
situation
different.
On
basis
leaching,
ions
formation
CoP‐Co(OH)
2
species.
doping
enhances
adsorption
*H,
showing
excellent
H
free
energy,
thereby
greatly
improving
activity.
Simultaneously,
it
also
OOH*,
effectively
facilitating
occurrence
reactions.
only
needs
261
76
mV
overpotential
to
drive
current
density
20
mA
cm
−2
10
,
can
be
maintained
unchanged
100
h.
provides
new
insights
into
strategies
mechanisms.
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 6, 2025
Ruthenium
(Ru)
is
a
more
cost-effective
alternative
to
platinum
anode
catalysts
for
alkaline
anion-exchange
membrane
fuel
cells
(AEMFCs),
but
suffers
from
severe
competitive
adsorption
of
hydrogen
(Had)
and
hydroxyl
(OHad).
To
address
this
concern,
strongly
coupled
multisite
electrocatalyst
with
highly
active
cluster-scale
ruthenium-tungsten
oxide
(Ru-WOx)
interface,
which
could
eliminate
the
phenomenon
achieve
high
coverage
OHad
Had
at
Ru
WOx
domains,
respectively,
designed.
The
experimental
theoretical
results
demonstrate
that
domain
functions
as
proton
sponge
perpetually
accommodate
activated
species
spillover
adjacent
domain,
resulting
WO-Had
are
readily
Ru-OHad
heterointerface
finish
oxidation
reaction
faster
kinetics
via
thermodynamically
favorable
Tafel-Volmer
mechanism.
AEMFC
delivers
peak
power
density
1.36
W
cm-2
low
catalyst
loading
0.05
mgRu
outstanding
durability
(negligible
voltage
decay
over
80-h
operation
500
mA
cm-2).
This
work
offers
completely
new
insights
into
understanding
HOR
mechanism
designing
advanced
AEMFCs.
ACS Applied Nano Materials,
Journal Year:
2024,
Volume and Issue:
7(15), P. 17868 - 17876
Published: July 26, 2024
The
rational
design
of
cost-effective
electrocatalysts
for
the
hydrogen
evolution
reaction
(HER)
still
remains
a
major
challenge
in
continuable
energy
storage
and
conversion
systems.
In
this
study,
vertically
hollow
ultrathin
Mo-doped
CoP
(Mo-CoP)
nanoarrays
are
prepared
on
nickel
foam
by
hydrothermal
low-temperature
phosphating
strategies.
Mo-CoP
possess
bamboo-leaf
structure
with
diameter
ranging
from
20
to
150
nm
between
top
bottom
length
several
microns.
At
same
time,
substance
presents
crystalline–amorphous
structure.
synergistic
effect
doping
special
construction
can
supply
plentiful
active
sites,
enhance
electrolyte
penetration,
facilitate
gas
diffusion
process
electrocatalytic
reaction.
overpotentials
electrode
at
10
mA
cm–2
as
low
88.4,
78.7,
112.6
mV,
Tafel
slopes
87.2,
55.7,
120.3
mV
dec–1
alkaline,
acidic,
neutral
electrolytes,
respectively.
Moreover,
catalyst
also
displays
favorable
long-term
stability
all
pH
ranges.
