ACS Catalysis,
Journal Year:
2023,
Volume and Issue:
13(13), P. 8467 - 8476
Published: June 12, 2023
The
NiOOH
electrode
is
commonly
used
in
electrochemical
alcohol
oxidations.
Yet
understanding
the
reaction
mechanism
far
from
trivial.
In
many
cases,
difficulty
lies
decoupling
of
overlapping
influence
chemical
and
factors
that
not
only
govern
pathway
but
also
crystal
structure
situ
formed
oxyhydroxide.
Here,
we
use
a
different
approach
to
understand
this
system:
start
with
synthesizing
pure
forms
two
oxyhydroxides,
β-NiOOH
γ-NiOOH.
Then,
using
oxidative
dehydrogenation
three
typical
alcohols
as
model
reactions,
examine
reactivity
selectivity
each
While
solvent
has
clear
effect
on
rate
β-NiOOH,
observed
was
found
be
unaffected
remained
over
95%
for
both
primary
secondary
aldehydes
ketones,
respectively.
Yet,
high
concentration
OH-
aqueous
promoted
preferential
conversion
benzyl
benzoic
acid.
Thus,
formation
carboxylic
compounds
oxidation
without
alkaline
electrolyte
more
likely
follow
direct
pathway.
Overoxidation
β-
γ-phase
will
affect
sustained
>95%
conversion.
mechanistic
examinations
comprising
kinetic
isotope
effects,
Hammett
analysis,
spin
trapping
studies
reveal
oxidatively
dehydrogenated
benzaldehyde
via
consecutive
hydrogen
atom
transfer
steps.
This
work
offers
unique
catalytic
properties
shedding
light
NiOOH-based
electrodes.
Chemical Reviews,
Journal Year:
2023,
Volume and Issue:
123(11), P. 7119 - 7192
Published: Feb. 7, 2023
Since
severe
global
warming
and
related
climate
issues
have
been
caused
by
the
extensive
utilization
of
fossil
fuels,
vigorous
development
renewable
resources
is
needed,
transformation
into
stable
chemical
energy
required
to
overcome
detriment
their
fluctuations
as
sources.
As
an
environmentally
friendly
efficient
carrier,
hydrogen
can
be
employed
in
various
industries
produced
directly
(called
green
hydrogen).
Nevertheless,
large-scale
production
water
electrolysis
prohibited
its
uncompetitive
cost
a
high
specific
demand
electricity
expenses,
which
enhancing
corresponding
thermodynamics
kinetics
at
elevated
working
temperatures.
In
present
review,
effects
temperature
variation
are
primarily
introduced
from
perspective
cells.
Following
increasing
order
temperature,
multidimensional
evaluations
considering
materials
structures,
performance,
degradation
mechanisms
mitigation
strategies
well
stacks
systems
presented
based
on
alkaline
cells
polymer
electrolyte
membrane
(ET-AECs
ET-PEMECs),
ionic
conductors
(ET-ICs),
protonic
ceramic
(PCECs)
solid
oxide
(SOECs).
Advanced Materials,
Journal Year:
2022,
Volume and Issue:
34(37)
Published: July 28, 2022
Hydrogen
spillover
(HSo)
has
emerged
to
upgrade
the
hydrogen
evolution
reaction
(HER)
activity
of
Pt-support
electrocatalysts,
but
it
is
not
applicable
deprotonated
oxygen
(OER).
Non-precious
catalysts
that
can
perform
well
in
both
HSo
and
deprotonation
(DeP)
are
extremely
desirable
for
a
sustainable
economy.
Herein,
an
affordable
MoS2
/NiPS3
vertical
heterostructure
catalyst
presented
synergize
DeP
efficient
water
electrolysis.
The
internal
polarization
field
(IPF)
clarified
as
driving
force
HER
electrocatalysis.
from
edge
NiPS3
activate
basal
plane
boost
(112
mV
vs
reversible
electrode
(RHE)
at
10
mA
cm-2
),
while
OER,
IPF
facilitate
hydroxyl
diffusion
render
-to-NiPS3
/P-to-S
dual-pathways
DeP.
As
result,
stacking
OER-inactive
on
surface
still
brings
intriguing
OER
enhancements.
With
them
serving
couples,
overall
splitting
attested
stably
with
cell
voltage
1.64
V
.
This
research
puts
forward
criterion
rational
design
HSo/DeP-unified
non-precious
Energy & Environmental Science,
Journal Year:
2022,
Volume and Issue:
16(1), P. 285 - 294
Published: Dec. 6, 2022
Finding
an
active
and
robust
non-platinum
catalyst
toward
the
alkaline
hydrogen
evolution
reaction
(HER)
operating
at
ampere-level
current
density
is
important
for
emerging
anion
exchange
membrane
(AEM)
water
electrolysis
but
challenging.
Journal of Power Sources,
Journal Year:
2023,
Volume and Issue:
592, P. 233904 - 233904
Published: Dec. 8, 2023
Hydrogen
produced
using
renewable
energy
from
offshore
wind
provides
a
versatile
method
of
storage
and
power-to-gas
concepts.
However,
few
dedicated
floating
electrolyser
facilities
currently
exist
therefore
conditions
the
environment
on
hydrogen
production
cost
efficiency
remain
uncertain.
Therefore,
this
review
focuses
conversion
electrical
to
hydrogen,
water
electrolysis
located
in
areas.
The
challenges
associated
with
remote
locations,
fluctuating
power
harsh
are
highlighted
recommendations
for
future
system
designs
suggested.
latest
research
polymer
electrolyte
membrane,
alkaline
membraneless
evaluated
order
understand
their
capital
costs,
current
status
achieving
scaled
manufacturing
GW
scale
required
next
three
decades.
Operating
fundamentals
that
govern
performance
each
device
investigated
specifically
integration
electrolysers
turbines
is
presented.
