Preparation of La_0.9Sr_0.1Ga_0.8Mg_0.2O₃ Film by Pulse Laser Deposition (PLD) Method on Porous Ni–Fe Metal Substrate for CO₂ Electrolysis

Abstract

Preparation of metal supported La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3 (LSGM) thin film cell for CO 2 electrolysis was studied and by using selective reduction method of NiO-NiFe 2 O 4 , it was found that porous Ni-Fe(9:1) based substrate with ca.30% porosity was successfully prepared without large volume change resulting in the successful preparation of LaGaO 3 dense thin film on metal substrate. By using Ce 0.8 Sm 0.2 O 2 (SDC) thin film, Ni diffusion from Ni-Fe substrate was prevented. CO 2 electrolysis was performed on the prepared LSGM/SDC on Ni-Fe porous substrate. When Sm 0.5 Sr 0.5 CoO 3 (SSC) anode was prepared by screen print method using SSC powder, sintering of SSC powder was significantly occurred resulting in the large IR loss and overpotential. In contrast, when SSC anode layer was deposited by PLD (30 min) after LSGM/ SDC layer deposition, tight contact between SSC anode and LSGM electrolyte film was obtained and the large CO 2 electrolysis current of 3 and 0.5 A/cm 2 were achieved at 973 and 773 K, respectively. Impedance analysis suggests that increased CO 2 electrolysis current was obtained by decreased IR loss and electrode overpotential. KEY WORDS: CO 2 electrolysis; solid oxide electrolysis cell; LaGaO 3 thin film; metal support.

Reduction and oxidation kinetics of NiWO4 as an oxygen carrier for hydrogen storage by a chemical looping process

“…In this image it can be observed how the initial particle changed its surface morphology from a non-porous rock-like regular shape to a porous coral-like morphology formed by a network of particle agglomerates of about 50 nm size (see ESI † ) with cavities between 50 to 100 nm size. These morphologies have been observed previously by Tatsumi et al 55 for NiO–NiFe 2 O 4 and Ahmed et al 56 for NiWO 4 calcined in a temperature range from 750 to 900 °C. According to these authors and Kang and Jeong, 53 the reduction process is as follows: NiWO 4 + H 2 → Ni + WO 3 + H 2 O WO 3 + H 2 → WO 2 +H 2 O WO 2 + H 2 → W + H 2 O …”

Materials of solid oxide electrolysis cells for H 2O and CO 2 electrolysis: A review

“…Metal-supported H-SOECs (MS-H-SOECs) have attracted much attention because of the advantages of lower operating temperatures and R Ω and higher mechanical strength and thermal conductivities [412]. In this design, Fe-Cr ferritic stainless steels and Ni alloys (NiMo [413] and NiFe [414]) are used for the support. So far, the development of MS-H-SOECs is at an early stage, facing numerous issues regarding cell fabrication [366,412,415] and electrolytic contamination of Si and Cr by metal support.…”

Progress in metal-supported solid oxide electrolysis cells: A review

“…Ishihara's group at Kyushu University has explored CO2 electrolysis using La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) electrolyte, motivated by industrial re-use of CO2 to provide CO as a fuel, and O2 for combustion [50][51][52].…”

“…Stainless steel is by far the most common choice of support material for MS-SOFCs and MS-SOECs, but other metals have been used including NiMo and NiFe [46,52]. These are not expected to form a protective scale, but they can be stable under certain conditions.…”