Fabrication of a high-performance nano-structured Ln_1−xSr_xMO_3−δ (Ln = La, Sm; M = Mn, Co, Fe) SOC electrode through infiltration

Abstract

In order to solve the problem of degradation and enhance electrochemical activity of oxygen electrode, an effective method is that utilizing the electrode/electrolyte material as a scaffold and then infiltrating oxygen electrode materials into it.

Boosting the performance and durability of Ni/YSZ cathode for hydrogen production at high current densities via decoration with nano-sized electrocatalysts

“…Nevertheless, to ensure a high production rate of hydrogen and to reduce investment costs (CAPEX), operation at high current densities (-1 A/cm 2 and higher) needs to be considered. For conventional solid oxide cells composed of a La1-xSrxMnO3-δ or La1-xSrxCo1-yFeyO3-δ oxygen electrode, an yttria stabilized zirconia (YSZ) electrolyte and a Ni/YSZ fuel electrode the major degradation mechanisms at high-current steam electrolysis (above -1 A/cm 2 ) are delamination of the oxygen electrode, crack formation in the YSZ electrolyte, formation of ZrO2 nano-particles on the Ni surface and bubbles in the YSZ electrolyte, destruction of the Ni-YSZ interface and poisoning of the Ni/YSZ electrodes with impurities [5][6][7][8] . The degradation of the Ni/YSZ electrode strongly depends on the cell's over-potential 5 or in other words the cathodic polarization.…”

“…For the later strategy, a relatively novel method of in-situ forming nano-sized electrocatalysts by solution infiltration in a porous structure is often used. The infiltration of electro-catalyst precursor solutions into a conventional solid oxide cell fuel electrode or oxygen electrode, or into a specially developed scaffold has shown to be very efficient in improving the electrode performance in the short term 8,[15][16][17][18][19] . Whereas for long-term tests, only few operations of infiltrated electrodes tested in either fuel cell mode or electrolysis mode have been reported, focusing on oxygen electrode infiltration mainly 17,[20][21][22] .…”

Molten Salt Synthesis of High-Performance, Nanostructured La0.6Sr0.4FeO3−δ Oxygen Electrode of a Reversible Solid Oxide Cell

“…As a mixed electronic and ionic conductor (MIEC), (La,Sr)FeO 3−δ (LSF) has been extensively studied to replace the conventional manganite based materials and exhibit much higher electrochemical performance at intermediate temperature (600-800 • C) [5,6]. LSF has a similar thermal expansion coefficient (TEC) to the zirconia-based electrolyte, as well as improved stability and lowered cost, compared to Sr-doped LaCoO 3 material [7].…”

Powering Solid Oxide Fuel Cells with Syngas Using La0.4Sr0.5Ba0.1TiO3 Anode Infitrated with Nano‐composite

“…A strategy for achieving the excellent electrochemical performance of an anode without losing its structural integrity in hydrocarbons is to combine the above mentioned two types of catalysts through introducing an active nano‐scale catalyst into the perovskite‐based substrate . Infiltrating metallic catalysts into a sintered porous perovskite‐based skeleton holds great potential for achieving this goal , .…”