Nanostructured functional layers for solid oxide fuel cells

Abstract

SUMMARYNanostructured coatings are fabricated for potential use as electrodes in solid oxide fuel cells (SOFC) by developing innovative plasma spraying methods. The nanostructured NiO1YSZ anodes are fabricated by three means: spraying of presynthesized agglomerates of nanoparticles, suspension dc plasma spraying and solution precursor dc plasma spraying. Cathode deposits of variety of chemical composition having nanostructure were fabricated by thermal plasma chemical vapor deposition (TP-CVD) using RF-plasma torch. The deposits of desired phase and microstructure were successfully produced. The nanostructured anode, fabricated by presynthesized agglomerates of nanoparticles, exhibited better gas permeability, comparable high temperature conductivity and 43% lower polarization in SOFC operation at 8001C compared with conventional anodes. Moreover, by controlling the electrode structure, the nanostructure of anode could be maintained for 1500 h of operation. Further improvement in the microstructure of anodes is in progress using dc plasma suspension and solution precursor spraying. Cathodes obtained from thermal plasma chemical vapor deposition (TPCVD) exhibited initially undesirable secondary phases, which were overcome by adjusting the chemical composition of the precursors. The deposit columnar structure had high open porosity and specific surface area.

Development of Bi‐layer Metal Substrate Architectures for Suspension Plasma Sprayed Solid Oxide Fuel Cells

“…The measured permeabilities found are 3.77 × 10 −14 m 2 for the bi‐layered supports and 3.05 × 10 −14 m 2 for the single‐layered substrate. For comparison purposes, permeabilities of different coatings fabricated by plasma spraying and a support fabricated by tape casting as well as an anode support fabricated by combustion synthesis are presented in Table . Permeabilities of electrolyte coatings found in the literature are included in Table to provide a better picture of the magnitude of the permeability in cases where mostly dense but non‐defect free coatings are fabricated.…”

Performance Enhancement of SOFC Anode Through Electrochemically Induced Ni/YSZ Nanostructures

“…17), was added. Recently, Ansar et al 20 evaluated the fabrication of nanostructured AFLs by plasma spraying. Sunagawa et al 18 and Sato et al 19 built a nanostructured anode by mixing nanometer-sized powders in a pH-controlled aqueous medium.…”

Synthesis of highly conductive PPy/graphene nanosheets/NiO composite using ultrasonic technique

“…Among those nano‐inorganic materials, nickel oxide (NiO) have attracted considerable interest as a strong candidate for many applications in electrochromic films, sensor, electrochemical capacitors, photocatalysts, and batteries . So, many research scientists are working hard to develop various methods for the synthesis of high‐quality nanostructured materials . Therefore, the composites of PPy and nickel oxide may provide a new material with modified properties.…”