Fabrication of gradient porous LSM cathode by optimizing deposition parameters in ultrasonic spray pyrolysis

Synthesis and characterization of La1-xSr xMnO3±δ powders obtained by the polymeric precursor route

“…The La 0.8 Sr 0.2 Mn0 3 gives a good combination of electronic conductivity and expansion coefficient matching, and is now available commercially for SOFC applications. Higher conductivity can be obtained at higher dopant levels, but the expansion coefficient then becomes too high [12][13][14][15][16][17][18][19][20] . There are several routes to synthesize perovskite structured materials.…”

Three‐Dimensional Reconstruction and Microstructure Modeling of Porosity‐Graded Cathode Using Focused Ion Beam and Homogenization Techniques

“…This paper reports experimental and theoretical 3D analysis of the microstructure of LSM cathode with porosity gradient in the structure previously fabricated via deposition on YSZ electrolyte using a modified multi-step spray pyrolysis technique [5,7]. The experimental work described in our previous paper, shows promise toward the capability of the method for fabricating microstructures with gradient porosity.…”

“…A porosity-graded cathode composed of large pores for fast gas transport at the surface and gradually smaller pores through the thickness can lower concentration polarization associated with the transport of gas through the porous cathode while leading to a more uniform stress distribution. FGMs have been fabricated for porous SOFCs electrodes using various techniques such as template synthesis, combustion chemical vapor deposition (CVD), and spray pyrolysis (SP) [4,5]. Due to variations of microstructural parameters in FGMs, it is essential to predict the bulk properties of FGMs based on three-dimensional (3D) characterization of the microstructure.…”

Solid oxide fuel cell reliability and performance modeling and fabrication by spray pyrolysis

“…Compared with other techniques, spray pyrolysis has the most potential capability to control the deposition microstructure because of the flexibility in processing parameters and their impact on film structure. Several types of spray pyrolysis methods have been investigated to fabricate electrode in SOFCs, such as electrostatic spray pyrolysis Wilhelm et al, 2005;Nguyen and Djurado, 2001;Princivalle et al, 2004), gas pressurized spray pyrolysis (Beckel et al, 2006;Muecke et al, 2009;Muecke, Akiba, Infortuna, Salkus, Stus and Gauckler, 2008) and ultrasonic spray pyrolysis (Hamedani et al, 2008;Moe et al, 1998;Chang et al, 2008;Chen and Hwang, 2008). However, none of the studies on ultrasonic spray pyrolysis investigated porosity of the deposited electrode, which can significantly influence the electrode performance (Zhao and Virkar, 2005).…”

“…In this approach, precursor aerosol is transported by a carrier gas, which enables deposition by evaporationdecomposition of precursor solution droplets. Therefore, the anode film is formed and thickened by the accumulation of droplets similar to that of aerosol assisted CVD Choy and Su, 2001;Hamedani et al, 2008). Compared to conventional spray pyrolysis, the proposed method can deposit a more uniform film with uniformly-sized particles.…”