Frontiers in Energy Research,
Год журнала:
2024,
Номер
12
Опубликована: Окт. 24, 2024
The
production
of
hydrogen
(H
2
)
and
multi-carbon
fuels
through
water
electrolysis
(oxygen
evolution
reaction
(OER)/hydrogen
(HER))
water–CO
co-electrolysis
(OER/CO
reduction
(CO
RR)),
respectively,
is
supposed
to
be
the
emergent
energy
carrier.
These
electrochemical
processes
are
essential
chemical
conversion
pathways
that
initiate
changes
toward
renewable
energy.
This
review
summarizes
systematic
design
earth-abundant
transition
metal-based
nanomaterials
their
electrocatalytic
activities
reactions
such
as
OER,
HER,
CO
RR.
primary
focus
on
fabricating
highly
effective,
low-cost,
advanced
nanostructures
for
both
OER/HER
OER/CO
RR
systems.
Developing
synthetic
strategies
surface
morphology-controlled
nanostructured
electrocatalysts,
engineering
electrode
surface,
enhancing
activity,
understanding
relationship
between
intrinsic
catalytic
activity
preparation
approaches
or
precursor
choices,
exploring
mechanism
focused
on.
Furthermore,
current
challenges,
figure-of-merit,
prospects
described.
study
may
open
new
opportunities
develop
shape-controlled
high-performance
electrocatalysts
storage
reactions.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 9, 2024
Abstract
The
utilization
of
salt
concentration
gradients
as
a
renewable
energy
source
represents
pivotal
solution
to
the
crisis.
However,
it
is
persistent
challenge
fabricate
high‐performance
ion
permeable
membranes
with
excellent
permselectivity.
In
this
work,
hydrogen‐bonded
organic
framework
(HOF)
in
situ
growth
on
anodic
aluminum
oxide
(AAO)
via
chemical‐binding
and
solution‐processing
strategy.
hydrogen
bonding
π–π
interactions
forming
porous
structure
internal
unprotonated
carboxyl
groups
endow
HOF
superior
cation
selectivity
permeability.
Furthermore,
benefiting
from
remarkable
asymmetry
prepared
nanofluidic
membrane
arising
charge
AAO
HOF,
HOF/AAO
presents
outstanding
current
rectification
(ICR)
characteristic,
which
can
eliminate
polarization
(ICP)
power
loss.
Therefore,
an
impressive
output
density
500‐fold
NaCl
gradient
achieved
75.2
W
m
−2
using
as‐prepared
HOF/AAO,
most
reported
(7.0–40.0
).
To
show
critical
role
2D
3D
MOF
same
monomers
are
also
synthesized,
achieving
decreased
densities
36.2
58.3
respectively.
present
work
provides
novel
strategy
develop
ICR
for
osmotic
harvesting.
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 12, 2024
The
structures
of
covalent
organic
frameworks
(COFs)
are
typically
determined
through
modeling
based
on
powder
X-ray
diffraction.
However,
the
intrinsically
limited
crystallinity
COFs
often
results
in
structural
determinations
low
fidelity.
Here,
we
present
real-space
imaging
an
extensively
studied
two-dimensional
imine-based
COF.
Contrary
to
conventional
understanding
that
this
COF
features
uniform
hexagonal
pores,
our
observations
reveal
presence
two
distinct
sets
pores
with
differences
shape
and
size.
Motivated
by
finding,
conducted
reciprocal-space
characterizations,
complemented
solid-state
nuclear
magnetic
resonance
spectroscopy
density
functional
theory
calculations,
reevaluate
seemingly
simple
structure.
collective
allow
for
establishment
a
new
model
landmark
its
derivatives,
differing
from
both
intra-
interlayer
configurations.
Furthermore,
identified
various
previously
unrecognized
defective
imaging,
which
have
significant
implications
applications
separation
catalysis.
Our
study
demonstrates
complexity
heterogeneity
structures,
while
also
highlighting
imperative
reevaluation
using
advanced
characterization
techniques.
Access
to
clean
and
renewable
energy,
osmotic
energy
from
salinity
gradient
difference,
for
example,
is
central
the
sustainability
of
human
civilization.
Despite
numerous
examples
nanofluidic
membranes
conversion,
one
produced
abundant
biomass
resources
remains
largely
unexplored.
In
this
work,
cotton-derived
cellulose
nanocrystals
(CNCs)
are
employed
fabricate
a
membrane
by
self-assembly
with
polyvinyl
alcohol
(PVA)
subsequent
in
situ
growth
metal-organic
framework
(MOF),
UiO-66-(COOH)
