ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
17(1), P. 2365 - 2375
Published: Dec. 17, 2024
Surface
oxidation/reduction
processes,
driven
by
varying
electrochemical
potentials,
can
substantially
impact
catalyst
effectiveness
and,
consequently,
electrolyzer
performance.
This
study
combines
theoretical
and
experimental
approaches
to
explore
the
surface
redox
behavior
of
nickel
oxides,
which
are
cost-effective
efficient
catalysts
for
many
reactions.
Pourbaix
diagrams
three
different
phases
i.e.,
hydroxide
(Ni(OH)2),
oxyhydroxide
(NiOOH),
dioxide
(NiO2),
were
constructed
using
density
functional
theory-based
simulations.
Various
methods,
including
cyclic
voltammetry,
in
situ
Raman
spectroscopy,
titration,
employed
probe
processes
oxide
thin
films.
Our
findings
indicate
that
ABAB
stacking
sequence
Ni(OH)2
lacks
stability
under
oxidizing
conditions
host
oxidation
(deprotonation)
events,
while
AABBCC
NiOOH
is
energetically
favorable
due
presence
interlayer
hydrogen
bonding.
Rapid
charge
transfer
facilitated
bonding
accounts
higher
reactivity
partially
oxidized/reduced
(001)
surfaces
compared
NiO2
with
same
stoichiometry,
where
absent.
Insights
presented
this
work
offer
guidelines
optimizing
operational
tailoring
structures
states
oxides
enhance
performance
applications
such
as
electrocatalysis
supercapacitors.
ChemElectroChem,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 21, 2025
This
review
presents
a
comprehensive
analysis
of
Ni‐based
catalysts
for
the
co‐electrolysis
H
2
O
and
5‐hydroxymethylfurfural
(HMF)
under
alkaline
conditions,
enabling
co‐production
low‐carbon
hydrogen
2,5‐furandicarboxylic
acid
(FDCA),
key
biobased
platform
chemical.
First,
recent
advances
in
elucidating
mechanism
HMF
electrooxidation
(HMFOR)
to
FDCA
on
Ni
are
examined.
Next,
an
in‐depth
evaluation
HMFOR
performance
various
is
provided,
highlighting
effects
doping
or
combining
with
transition
metals
such
as
Fe,
Co,
Cu,
Mn,
well
multimetallic
compositions.
Finally,
activity
compared
across
studies
identify
trends
propose
research
directions
scaling
this
technology
industrial
level.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
17(1), P. 2365 - 2375
Published: Dec. 17, 2024
Surface
oxidation/reduction
processes,
driven
by
varying
electrochemical
potentials,
can
substantially
impact
catalyst
effectiveness
and,
consequently,
electrolyzer
performance.
This
study
combines
theoretical
and
experimental
approaches
to
explore
the
surface
redox
behavior
of
nickel
oxides,
which
are
cost-effective
efficient
catalysts
for
many
reactions.
Pourbaix
diagrams
three
different
phases
i.e.,
hydroxide
(Ni(OH)2),
oxyhydroxide
(NiOOH),
dioxide
(NiO2),
were
constructed
using
density
functional
theory-based
simulations.
Various
methods,
including
cyclic
voltammetry,
in
situ
Raman
spectroscopy,
titration,
employed
probe
processes
oxide
thin
films.
Our
findings
indicate
that
ABAB
stacking
sequence
Ni(OH)2
lacks
stability
under
oxidizing
conditions
host
oxidation
(deprotonation)
events,
while
AABBCC
NiOOH
is
energetically
favorable
due
presence
interlayer
hydrogen
bonding.
Rapid
charge
transfer
facilitated
bonding
accounts
higher
reactivity
partially
oxidized/reduced
(001)
surfaces
compared
NiO2
with
same
stoichiometry,
where
absent.
Insights
presented
this
work
offer
guidelines
optimizing
operational
tailoring
structures
states
oxides
enhance
performance
applications
such
as
electrocatalysis
supercapacitors.
