Development of novel High Temperature and
Pressure Alkaline Electrolysis Cells (HTP-AEC)
Jens Q Adolphsen ([email protected]); Vanesa Gil, Bhaskar R. Sudireddy and Christodoulos
Chatzichristodoulou ([email protected])
The cell concept
A HTP-AEC with gas diffusion electrodes (metal foams) and an aqueous KOH
electrolyte immobilized in a mesoporous ceramic matrix structure has been
developed at DTU Energy.
Very high current density and performance has been demonstrated with shirt
3.75 A/cm2 at 1.75 V with
el = 85 % (200C, 20 bar)
High temperatures (200C) increase the activity of the electrodes and the
conductivity of the electrolyte significantly.
A cell that allows for high efficiency and current density simultaneously using
The mesoporous electrolyte matrix contains the KOH electrolyte. The porous
electrodes will allow some infiltration of the electrolyte into the electrode to
increase the surface area where the electrochemical reactions take place.
Results - Electrochemical activity towards the OER
Corrosion issues at the oxygen electrode. Identification of more stable materials,
also show sufficiently high catalytic activity towards the oxygen evolution
of cell layers
microstructure using a low cost &
method. methods.based on La, Ni and Fe for the oxygen
evolution reaction (OER) have been identified and evaluated.
The electrochemical activity of the materials has been tested at room
temperature and pressure conditions in N 2 atmosphere using densely sintered
pellets polished down to 1 m roughness.
The chemical stability of the powder , immersed in 45 wt% KOH, and heated in
an autoclave to 220C has been examined comparing XRD patterns before and
Three-electrode setup for
The iR-corrected chronopotentiostatic measurements of LaNi 0.6Fe0.4 O3 and the
Nyquist plot of the EIS measurements performed after each chronopotentiostatic
measurement. Current densities are based on geometric surface areas.
Chemical stability assessment
Results chemical stability
LaNi0.6Fe0.4O3 pellet surface
before and after ~20 h
Initial polished surface testing.
Comparisson of the 2nd set of
chronopotentiostatic tests performed at
10 mA/cm2. LaNiO3 could not be
sintered dense without decomposition
of mainly Material
and La2NiO4(E = a
Polished surface after electrochemical
XRD patterns of the as-received LaNiO3
powder and the same powder after exposure
to 45 wt% KOH at 220 C for 1 week. The
symbols represent the following phases:
LaNiO3, LaO(OH), NiO(OH), + La2O3, *
NiO. The LaNi0.6Fe0.4O3 and La2Ni0.9Fe0.1O4
powder showed similar decomposition
at a slowerfrom
solution used for the chemical stability
testing. If any dissolution is happening the
ions seem to be consumed by the
DTU Energy, Technical University of Denmark
Department of Energy Conversion and Storage
Frederiksborgvej 399, 4000 Roskilde
The tafel plot of the measurements.
The fit is from 0.5 10 mA/cm2. There
is a slight increase in the tafel slope
above 2 mA/cm2 which is then not
+b log[i]) from the
tafel plot together
overpotential, , at 10
mA/cm2. The state-ofLa2Ni0.9Fe0.1O4
the-art, IrOx, and two
of the best
performing nonPrBaCo2O5+x 
are also included as
of porous oxygen electrodes
Based on the electrochemical screening LaNi0.6Fe0.4O3 is going to be used as
oxygen evolution electrocatalyst. The microstructure of the oxygen electrode is
going to be optimized using the processing method screen printing. An
electrode with a bimodal porosity distribution is envisioned to allow for
electrolyte infiltration (~10-100 m pore sizes) and gas diffusion (2-10 m pore
sizes) of evolved oxygen.
Successful fabrication and electrochemical characterization of upscaled cells (5 x 5 cm2) with the microstructurally optimized oxygen
is the expected outcome of the project.
 C. Chatzichristodoulou, F. Allebrod, M. B. Mogensen, J. Electrochem. Soc., 163 (1) (F3036-F3040), 2016
 C. C. L. McCrory, S. Jung, J. C. Peters, T. F. Jaramilllo, J. Am. Chem. Soc. 135 (16977-16987), 2013
 L. Trotochaud, J. K. Ranney, K. N. Williams, S. W. Boettcher, J. Am. Chem Soc. 134 (17253-17261), 2012
 A. Grimaud, K. J. May, C. E. Carlton, Y-L. Lee, M. Risch, W. T. Hong, J. Zhou, Y. Shao-Horn, Nat. Commun. 4 (2439-2445), 2013
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