Oxygen
vacancy
engineering
plays
a
crucial
role
in
regulating
surface
chemistry
for
managing
redox
behaviors.
However,
controllable
implantation
of
oxygen
and
safe
cost-effective
production
remain
challenging.
Herein,
we
report
general
molten
zinc
reduction
technology
to
prepare
oxygen-deficient
oxides
with
tunable
content,
synthetic
universality,
industrial
compatibility
under
mildly
elevated
temperature.
Taking
TiO2
as
an
example,
theoretical
study
demonstrates
thermodynamically
favorable
affinity
on
increasing
coverage
supporting
Zn
supply.
Featuring
electronic
structures
inferior
hydrogen
evolution
activity,
TiO2-x
nanoparticles
were
used
decorate
aqueous
anodes,
which
demonstrate
much
improved
cycling
stability,
verified
by
situ
ex
investigations.
Eventually,
zinc-iodine
batteries
assembled
using
modified
achieved
performance
due
the
regulated
anode
alleviated
self-discharge
This
work
provides
in-depth
understanding
durable
related
systems.
Advanced Materials,
Год журнала:
2024,
Номер
36(28)
Опубликована: Апрель 24, 2024
Abstract
Cost‐effective
transition
metal
chalcogenides
are
highly
promising
electrocatalysts
for
both
alkaline
and
acidic
hydrogen
evolution
reactions
(HER).
However,
unsatisfactory
HER
kinetics
stability
have
severely
hindered
their
applications
in
industrial
water
electrolysis.
Herein,
a
nanoflowers‐shaped
W‐doped
cubic/orthorhombic
phase‐mixed
CoSe
2
catalyst
((c/o)‐CoSe
‐W)
is
reported.
The
W
doping
induces
spontaneous
phase
from
stable
cubic
(c‐CoSe
)
to
metastable
orthorhombic
,
which
not
only
enables
precise
regulation
of
the
ratio
two
phases
but
also
realizes
at
interfaces
phases.
(c/o)‐CoSe
‐W
exhibits
Pt‐like
activity
media,
with
record‐low
overpotentials
29.8
mV
(alkaline)
35.9
(acidic)
10
mA
cm
−2
respectively,
surpassing
vast
majority
previously
reported
non‐precious
HER.
activities
originate
formation
Co–Se–W
active
species
on
c‐CoSe
side
interface,
effectively
modulates
electron
structures
sites,
enhancing
H
O
adsorption
dissociation
Co
sites
optimizing
*
Δ
G
H*
≈
0
sites.
Benefiting
abundant
interfaces,
displays
outstanding
long‐term
durability
media.
Chemical Society Reviews,
Год журнала:
2024,
Номер
unknown
Опубликована: Янв. 1, 2024
This
review
systematically
provides
various
insights
into
the
pH
effect
on
hydrogen
electrocatalysis,
and
thus
providing
a
reference
for
future
development
of
electrocatalysis
based
these
insights.
Abstract
The
designing
and
fabricating
highly
active
hydrogen
evolution
reaction
(HER)
electrocatalysts
that
can
superior
to
Pt/C
is
extremely
desirable
but
challenging.
Herein,
the
fabrication
of
Ru/TiO
2
/N‐doped
carbon
(Ru/TiO
/NC)
nanofiber
reported
as
a
novel
HER
electrocatalyst
through
electrospinning
subsequent
pyrolysis
treatment,
in
which
Ru
nanoclusters
are
dispersed
into
TiO
/NC
hybrid
nanofiber.
As
support,
experimental
theoretical
calculation
results
reveal
more
effectively
accelerate
water
dissociation
well
optimize
adsorption
strength
*
H
than
NC,
thus
leading
significantly
enhanced
activity,
merely
requires
an
overpotential
18
mV
reach
10
mA
cm
−2
,
outperforming
alkaline
solution.
electrolytic
cell
composed
NiFe
LDH/NF
generate
500
1000
at
voltages
1.631
1.753
V,
respectively.
Furthermore,
also
exhibits
remarkable
durability
for
least
100
h
200
with
negligible
degradation
activity.
present
work
affords
deep
insight
influence
support
on
activity
strategy
proposed
this
research
be
extended
fabricate
various
other
types
diverse
electrocatalytic
applications.
Nano Letters,
Год журнала:
2023,
Номер
23(23), С. 10930 - 10938
Опубликована: Ноя. 20, 2023
Aqueous
zinc-ion
batteries
have
attracted
a
continually
increasing
level
of
interest
for
large-scale
energy
storage
because
they
are
highly
safe
and
high
density
abundant
reserves.
However,
Zn
anodes
face
significant
challenges
such
as
severe
dendrite
growth
hydrogen
evolution
reaction
(HER).
We
here
propose
an
efficient
Zn2+
sieve
strategy
modulating
the
anode
chemistry
using
two-dimensional
NH2-MIL-125
(Ti)
metal-organic
framework
(MOF)
nanosheets.
Theoretical
investigations
reveal
crucial
role
Ti
MOF
in
regulating
solvation
structures
fast
diffusion
uniform
deposition
decreasing
HER
reactivity.
The
structure
nanosheets
enables
accessible
desolvation
sites
shortened
ionic
pathways.
As
result,
nanosheet-protected
exhibited
greatly
improved
cycling
stability
both
symmetric
cells
full
cells.
Operando
optical
monitoring
postmortem
analysis
revealed
effective
suppression
by
This
anti-HER
MOF-enabled
provides
viable
new
insights
optimizing
aqueous
batteries.
Abstract
Developing
abundant
Earth‐element
and
high‐efficient
electrocatalysts
for
hydrogen
production
is
crucial
in
effectively
reducing
the
cost
of
green
production.
Herein,
a
strategy
by
comprehensively
considering
computational
chemical
indicators
H*
adsorption/desorption
dehydrogenation
kinetics
to
evaluate
evolution
performance
proposed.
Guided
proposed
strategy,
series
catalysts
are
constructed
through
dual
transition
metal
doping
strategy.
Density
Functional
Theory
(DFT)
calculations
experimental
chemistry
demonstrate
that
cobalt‐vanadium
co‐doped
Ni
3
N
an
exceptionally
ideal
catalyst
from
electrolyzed
alkaline
water.
Specifically,
Co,V‐Ni
requires
only
10
41
mV
electrolytes
seawater,
respectively,
achieve
current
density
mA
cm
−2
.
Moreover,
it
can
operate
steadily
at
large
industrial
500
extended
periods.
Importantly,
this
evaluation
single‐metal‐doped
found
still
exhibits
significant
universality.
This
study
not
presents
efficient
non‐precious
metal‐based
electrocatalyst
water/seawater
electrolysis
but
also
provides
design
high‐performance
