ACS Catalysis,
Journal Year:
2020,
Volume and Issue:
10(9), P. 4854 - 4862
Published: March 27, 2020
Despite
substantial
progress
in
the
electrochemical
conversion
of
CO2
into
value-added
chemicals,
translation
fundamental
studies
commercially
relevant
conditions
requires
additional
efforts.
Here,
we
study
catalytic
properties
tailored
Cu
nanocatalysts
under
current
densities
a
gas-fed
flow
cell.
We
demonstrate
that
their
facet-dependent
selectivity
is
retained
this
device
configuration
with
advantage
further
suppressing
hydrogen
production
and
increasing
faradaic
efficiencies
toward
reduction
products
compared
to
conventional
H-cell.
The
combined
catalyst
system
effects
result
state-of-the
art
product
at
high
(in
range
100-300
mA/cm2)
relatively
low
applied
potential
(as
as
-0.65
V
vs
RHE).
cubes
reach
an
ethylene
up
57%
corresponding
mass
activity
700
mA/mg,
octahedra
methane
51%
1.45
A/mg
1
M
KOH.
Advanced Materials,
Journal Year:
2021,
Volume and Issue:
33(31)
Published: June 12, 2021
Abstract
Hydrogen
economy
has
emerged
as
a
very
promising
alternative
to
the
current
hydrocarbon
economy,
which
involves
process
of
harvesting
renewable
energy
split
water
into
hydrogen
and
oxygen
then
further
utilization
clean
fuel.
The
production
by
electrolysis
is
an
essential
prerequisite
with
zero
carbon
emission.
Among
various
technologies,
alkaline
splitting
been
commercialized
for
more
than
100
years,
representing
most
mature
economic
technology.
Here,
historic
development
overviewed,
several
critical
electrochemical
parameters
are
discussed.
After
that,
advanced
nonprecious
metal
electrocatalysts
that
recently
negotiating
evolution
reaction
(OER)
(HER)
discussed,
including
transition
oxides,
(oxy)hydroxides,
chalcogenides,
phosphides,
nitrides
OER,
well
alloys,
carbides
HER.
In
this
section,
particular
attention
paid
catalyst
synthesis,
activity
stability
challenges,
performance
improvement,
industry‐relevant
developments.
Some
recent
works
about
scaled‐up
novel
electrode
designs,
seawater
also
spotlighted.
Finally,
outlook
on
future
challenges
opportunities
offered,
potential
directions
speculated.
Science,
Journal Year:
2021,
Volume and Issue:
372(6546), P. 1074 - 1078
Published: June 3, 2021
Carbon
dioxide
electroreduction
(CO2R)
is
being
actively
studied
as
a
promising
route
to
convert
carbon
emissions
valuable
chemicals
and
fuels.
However,
the
fraction
of
input
CO2
that
productively
reduced
has
typically
been
very
low,
<2%
for
multicarbon
products;
balance
reacts
with
hydroxide
form
carbonate
in
both
alkaline
neutral
reactors.
Acidic
electrolytes
would
overcome
this
limitation,
but
hydrogen
evolution
hitherto
dominated
under
those
conditions.
We
report
concentrating
potassium
cations
vicinity
electrochemically
active
sites
accelerates
activation
enable
efficient
CO2R
acid.
achieve
on
copper
at
pH
<1
single-pass
utilization
77%,
including
conversion
efficiency
50%
toward
products
(ethylene,
ethanol,
1-propanol)
current
density
1.2
amperes
per
square
centimeter
full-cell
voltage
4.2
volts.
Science,
Journal Year:
2020,
Volume and Issue:
370(6513)
Published: Oct. 9, 2020
In
a
world
powered
by
intermittent
renewable
energy,
electrolyzers
will
play
central
role
in
converting
electrical
energy
into
chemical
thereby
decoupling
the
production
of
transport
fuels
and
chemicals
from
today's
fossil
resources
decreasing
reliance
on
bioenergy.
Solid
oxide
electrolysis
cells
(SOECs)
offer
two
major
advantages
over
alternative
technologies.
First,
their
high
operating
temperatures
result
favorable
thermodynamics
reaction
kinetics,
enabling
unrivaled
conversion
efficiencies.
Second,
SOECs
can
be
thermally
integrated
with
downstream
syntheses,
such
as
methanol,
dimethyl
ether,
synthetic
fuels,
or
ammonia.
SOEC
technology
has
witnessed
tremendous
improvements
during
past
10
to
15
years
is
approaching
maturity,
driven
advances
at
cell,
stack,
system
levels.
Chemical Reviews,
Journal Year:
2020,
Volume and Issue:
120(21), P. 12217 - 12314
Published: Nov. 2, 2020
Electrocatalysts
with
single
metal
atoms
as
active
sites
have
received
increasing
attention
owing
to
their
high
atomic
utilization
efficiency
and
exotic
catalytic
activity
selectivity.
This
review
aims
provide
a
comprehensive
summary
on
the
recent
development
of
such
single-atom
electrocatalysts
(SAECs)
for
various
energy-conversion
reactions.
The
discussion
starts
an
introduction
different
types
SAECs,
followed
by
overview
synthetic
methodologies
control
dispersion
atomically
resolved
characterization
using
state-of-the-art
microscopic
spectroscopic
techniques.
In
recognition
extensive
applications
electrocatalytic
studies
are
dissected
in
terms
important
electrochemical
reactions,
including
hydrogen
evolution
reaction
(HER),
oxygen
(OER),
reduction
(ORR),
carbon
dioxide
(CO2RR),
nitrogen
(NRR).
Examples
SAECs
deliberated
each
case
performance,
structure-property
relationships,
enhancement
mechanisms.
A
perspective
is
provided
at
end
section
about
remaining
challenges
opportunities
targeted
reaction.
