Composite titanate cathode enhanced with in situ grown nickel nanocatalyst for direct steam electrolysis

Progress of Exsolved Metal Nanoparticles on Oxides as High Performance (Electro)Catalysts for the Conversion of Small Molecules

“…Zhang et al. [ 128 ] and Wang et al. [ 148 ] also came to similar conclusions, in which the increase of steam concentration improved the efficiency of high temperature steam electrolysis.…”

“…Similar to the previous section, materials with exsolved single metal nanoparticles were widely investigated as catalysts for water electrolysis. The exsolved metal species include Ni, [ 54,56,83,123–128 ] Cu, [ 83,142,143 ] and Fe. [ 54,93,132–134 ] Besides the exsolution of single metal nanoparticles, the exsolution of alloy nanoparticles, such as Fe–Ni [ 147,148 ] and Co–Fe, [ 154,157 ] was also reported to enhance the activity of the catalysts for high temperature steam electrolysis.…”

“…Several researchers studied the effect of water vapor concentration on SOEC performance with exsolution materials as electrodes. [ 128,148,157 ] Yang et al. [ 157 ] prepared Pr 0.8 Sr 1.2 (Co, Fe) 0.8 Nb 0.2 O 4+ δ with exsolved Co–Fe alloy nanoparticles (K‐PSCFN‐CFA) by thermal annealing.…”

Pr and Ti co-doped Strontium Ferrite as a Novel Hydrogen Electrode for Solid Oxide Electrolysis Cell

“…confirms a single phase of cubic perovskite structure (JCPDS: #34-0638, a=3.8831±0.0030 Å, V=58.5503±0.1347 Å 3 ). angle, which can be explained as cell expansion (a=3.9021±0.0016 Å, V=59.4172±0.0748 Å 3 ) resulted from the transition of Fe 4+ (0.585 Å) to Fe 3+ (0.645 Å) and/or Ti 4+ (0.605 Å) to Ti 3+ (0.670 Å)[24,25]. As reported in the literature[26], a phase transformation from SrFeO 3−δ to Sr 2 Fe 2 O 5 occurred after annealing in a flow of 5%H 2 /Ar at 800 °C for 24 h. In comparison, PSTF shows much better at phase stability in reducing atmosphere.The mixed conductivity of PSTF is 0.25 S cm −1 at 800 °C in 5%H 2 /N 2 .…”

Vorschau 2/2016

“…The exsolution strategy has led to remarkable success in catalyst design and application. The synergetic effects of the exsolution‐induced system of Ni and Fe nanocatalysts anchored on the surface of La 0.3 Sr 0.7 TiO 3 6 and (La 0.2 Sr 0.8 ) 0.9 Ti 0.9 Fe 0.1 O 3 7 contribute to excellent stability and improved performance for direct steam electrolysis, accompanied by a 20 % enhancement of the current efficiencies and remarkable enhancement of Faraday efficiency (by approximately 100 %). After being sintered in air, ceria nanoparticles, exsoluted from Ce‐doped La 0.4 Sr 0.5 Ba 0.1 TiO 3‐ δ perovskite anode catalysts in solid‐oxide fuel cells, showed enhanced catalytic activity and electrochemical performance for H 2 oxidation 8.…”