Highly efficient 2D/2D NiCo-LDH/CuInS2 nanocomposites for electrocatalytic hydrogen and oxygen evolution reactions
Fuel,
Год журнала:
2025,
Номер
388, С. 134505 - 134505
Опубликована: Янв. 30, 2025
Язык: Английский
Impact of the Surface Microenvironment on the Redox Properties of a Co-Based Molecular Cathode for Selective Aqueous Electrochemical CO2-to-CO Reduction
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(22), С. 15345 - 15355
Опубликована: Май 20, 2024
Electrode-confined
molecular
catalysts
are
promising
systems
to
enable
the
efficient
conversion
of
CO2
useful
products.
Here,
we
describe
development
an
original
cathode
for
reduction
CO
based
on
noncovalent
integration
a
tetraazamacrocyclic
Co
complex
carbon
nanotube-based
matrix.
Aqueous
electrochemical
characterization
modified
electrode
allowed
clear
observation
change
redox
behavior
center
as
surface
concentration
was
tuned,
highlighting
impact
catalyst
microenvironment
its
properties.
The
enabled
CO2-to-CO
in
fully
aqueous
conditions,
giving
rise
turnover
number
(TONCO)
up
20
×
103
after
2
h
constant
electrolysis
at
mild
overpotential
(η
=
450
mV)
and
with
faradaic
efficiency
about
95%.
Post
operando
measurements
using
techniques,
inductively
coupled
plasma,
X-ray
photoelectron
spectroscopy
absorption
films
demonstrated
that
catalysis
remained
nature,
making
this
Co-based
new
alternative
electrocatalytic
media.
Язык: Английский
Polymer Binder Blends Stabilize Alkaline Hydrogen Evolution by Heterogenized Molecular Phen-Based Cobalt Electrocatalysts through Coordination and Environmental Control
Journal of the American Chemical Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 11, 2025
With
the
increase
in
greenhouse
gas
emissions
and
their
detrimental
effect
on
environment,
there
is
a
push
to
develop
renewable
way
produce
H2,
fuel
source
that
has
nonharmful
byproducts,
unlike
traditional
methods
of
energy
production.
Alkaline
water
electrolysis
seen
increasing
focus
as
viable
but
efficient
stable
electrocatalysts
are
required
facilitate
this
process.
Here,
heterogenized
Co(II)
phenanthroline-based
complex
for
production
H2
from
alkaline
disclosed.
Activity
was
improved
by
considering
role
axial
Co
ligation
reaction
environment
created
polymer
binder
catalyst
inks
using
variable
ratios
Nafion
poly-4-vinylpyridine
(P4VP).
A
ratio
1:1
Nafion:P4VP
found
have
highest
stability,
nanoparticle
formation
not
observed
when
P4VP
included
part
mixture.
The
activity
stability
enhancement
could
be
replicated
addition
molecular
pyridine
or
use
poly-2-vinylpyridine,
which
sterically
prevented
coordinating
Co.
increased
electrochemical
performance
caused
inclusion
attributed
mass
transfer
active
site
during
catalysis,
complementing
stabilizing
site.
Язык: Английский
From structure to function: MOF-based and COF-based catalysts for efficient electrocatalytic H2O2 production via 2e− ORR
Journal of Materials Chemistry A,
Год журнала:
2024,
Номер
12(40), С. 27180 - 27205
Опубликована: Янв. 1, 2024
Overview
of
the
structure
and
performance
organic
framework
materials
applied
in
2e
−
ORR
electrocatalysis.
Язык: Английский
Mechanism of Electrochemical Proton Reduction Catalyzed by a Cobalt Tetraaza Schiff Base Macrocyclic Complex: Ligand Protonation and/or Influence of the Chloro Ligand
ACS Catalysis,
Год журнала:
2024,
Номер
14(15), С. 11352 - 11365
Опубликована: Июль 19, 2024
Cobalt
complexes
with
tetra-
and
pentaaza-macrocyclic
ligands,
including
the
pyridyldiimine
motif
isolated
by
Busch
as
early
1970s,
is
a
very
promising
family
of
catalysts
that
were
only
quite
recently
exploited
for
both
electro-
photocatalytic
HER
CO2RR.
In
particular,
tetraaza
[CoIII(CR14)Cl2]+
(CR14
=
2,12-dimethyl-3,7,11,17-tetraazabicyclo[11.3.1]heptadeca-1(17),2,11,13,15-pentaene)
appears
to
be
one
most
efficient
stable
Co
in
pure
aqueous
solution
HER.
this
work,
we
reinvestigated
H2-evolving
mechanism
catalyzed
complex
an
organic
solvent
(CH3CN)
acid
p-cyanoanilinium
tetrafluoroborate
proton
source.
By
comparison
[CoIII(CR14)(CH3CN)2]3+
electrochemical
behavior
without
addition
chloride,
first
characterized
thermodynamical
coordination
decoordination
properties
chloro
ligands
at
CoIII,
CoII,
CoI
formal
redox
states.
Then,
showed
(through
echem,
UV–visible
absorption,
EPR)
facilitates
ligand
CoII
state
rather
than
protonation
nitrogen
ligand.
The
electroreduction
then
kinetically
thorough
cyclic
voltammetry
analysis.
resting
bulk
course
constant
potential
electrolysis
reduction
was
identified
nonprotonated
[CoII(CR14)(CH3CN)x]2+
(x
1
or
2)
species,
whereas
it
proposed
hydride
diffusion-reaction
layer.
Язык: Английский
The Hydrogen Evolution Reaction: Using Molecular Design in Transition Metal Complexes to Control Catalytic Microenvironments on Electrode Surfaces”
ChemCatChem,
Год журнала:
2024,
Номер
unknown
Опубликована: Июнь 13, 2024
Abstract
Hydrogen
gas
and
its
production
from
renewable
power
sources
will
be
an
important
part
of
decreasing
global
reliance
on
fossil
fuels
developing
a
sustainable
energy
economy.
Efficient
electrocatalysis,
however,
relies
the
delivery
both
protons
electrons;
ideally
in
concerted
fashion
to
avoid
high
intermediates,
prevent
charge
build‐up,
circumvent
large
kinetic
barriers.
While
this
can
achieved
using
ligand
design
homogenous
molecular
transition
metal
catalysts
(specifically
incorporating
proton
shuttles
secondary
coordination
sphere),
heterogeneous
systems
are
more
desirable
industrial
perspective
due
their
ease
use
enhanced
durability.
Supporting
electrode
surfaces
is
therefore
promising
approach
for
next
generation
electrocatalysts
that
retain
level
control
interfacial
environments.
This
review
first
cover
key
principles
natural
systems,
such
as
hydrogenase
enzymes,
then
survey
some
representative
examples
synthetic
homogeneous
hydrogen
evolution
incorporate
these
features.
We
discuss
species
have
been
supported
materials,
with
focus
recent
advances
field,
major
challenges
remain.
Язык: Английский
Crowding for Confinement: Reversible Isomerization of First-Generation Donor-Acceptor Stenhouse Adduct Derivatives in Water Modulated by Thermoresponsive Dendritic Macromolecules
Molecules,
Год журнала:
2024,
Номер
29(21), С. 5055 - 5055
Опубликована: Окт. 26, 2024
Mimicking
nature,
the
reversible
isomerization
of
hydrophobic
dyes
in
aqueous
solutions
is
appealing
for
bio-applications.
Here,
we
report
on
first-generation
solvatochromic
donor-acceptor
Stenhouse
adducts
(DASAs)
water
within
dendritic
matrices,
realized
either
through
dendronization
DASAs
or
incorporation
DASA
pendants
into
dendronized
copolymers.
These
macromolecules
contain
three-fold
oligoethylene
glycols
(OEGs),
which
afford
water-solubility
and
unprecedented
thermoresponsive
behavior.
The
behavior
both
copolymers
dominated
by
peripherals
OEGs.
However,
hydrophilicity
acceptor
from
moieties
also
play
a
role
mediating
their
thermal
phase
transitions,
more
importantly,
tailor
interactions
between
OEGs
moieties.
Intriguingly,
topologies
contribute
confinement
to
encapsulate
crowding
effects,
cooperative
crowded
modulate
with
different
media.
thermally
induced
collapse
OEGs,
accompanied
aggregation
macromolecules,
leads
formation
domains,
exert
enhanced
effects
efficiently
Compared
low
molar
mass
DASAs,
collapsed
can
retard
hydration
cooperation
neighboring
better
confined
microenvironments
mediate
recovery
up
90%
cyclic
charged
(hydrophilic)
state
noncharged
(hydrophobic)
linear
water.
This
exhibits
excellent
fatigue
resistance
after
several
cycles
alternating
photo-irradiation
annealing
at
elevated
temperatures.
Язык: Английский
Electrocatalytic hydrogen evolution reaction with a Cu porphyrin bearing meso-CF3 substituents
Dalton Transactions,
Год журнала:
2024,
Номер
53(48), С. 19121 - 19125
Опубликована: Янв. 1, 2024
A
Cu
porphyrin
bearing
four
meso
-CF
3
substituents
is
synthesized
and
displays
higher
activity
than
reported
porphyrins
for
the
electrocatalytic
hydrogen
evolution
reaction.
Язык: Английский
A Molecular Catalyst‐Driven Sustainable Zinc‐Air Battery Assembly
Small,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 5, 2024
Bidirectional
oxygen
reduction
reaction
(ORR)
and
evolution
(OER)
electrocatalysts
are
key
for
molecular
oxygen-centric
renewable
energy
transduction
via
metal-air
batteries.
Here,
a
cobalt
complex
is
covalently
tethered
on
strategically
functionalized
silica
surface
that
displayed
both
ORR
OER
in
alkaline
media.
The
detailed
X-ray
absorbance
spectroscopy
(XAS)
studies
indicate
this
catalyst
retains
its
intrinsic
features
while
playing
central
role
during
bidirectional
electrocatalysis
demonstrating
relatively
lower
gap
between
O
Язык: Английский