Double Perovskite LaSrCo_1.6Cu_0.4O_5-δCathode for IT-SOFCs with Pulsed Laser Technique Deposited Bi-Layer Electrolyte

Abstract

This study included two parts: (1) the structural characteristics, chemical stability, thermal expansion coefficient (TEC), chemical bulk diffusion coefficient (D chem ), chemical surface exchange coefficient (k chem ), electrochemical performance and single cell performance for LaSrCo 1.6 Cu 0.4 O 5+δ as an intermediate-temperature solid oxide fuel cells (IT-SOFC) cathode material, and (2) using a pulsed laser technique (PLD) deposited a dense Ce 0.8 Sm 0.2 O 1.9 (SDC) thin layer on thick SDC as bi-layer electrolyte and infiltrating SDC nanoparticles onto LaSrCo 1.6 Cu 0.4 O 5+δ skeleton to improve the performance of the single cell. The single cell assembling with 0.5M SDC-infiltrated LaSrCo 1.6 Cu 0.4 O 5+δ cathode and PLD-deposited SDC/SDC bilayer have shown very good performance at low operating temperatures.Currently, solid oxide fuel cells (SOFCs) have attracted a great deal of attention due to the advantages of high electrical efficiency, fuel versatility, low-pollutant emission, etc. 1-3 However, a high operating temperatures limits the application of SOFCs and lowers operating temperature to around 600 • C is primary goal in current SOFC research. Lately, research efforts have been devoted to decreasing a high operating temperature. Electrolyte materials with high ionic conductivity, such as Samaria-doped ceria (SDC), 4 bismuth oxides, 5 and lanthanum strontium gallate magnesite (LSGM) 6 have received attention for intermediate temperature SOFCs. SDC is considered one of the most promising materials for SOFCs. Its conductivity is 2-3 times greater than that of yttria stabilized zirconia (YSZ). 7 Nevertheless, one main limitation of the SDC electrolyte is the reduction of Ce 4+ to Ce 3+ induces n-type electronic conduction, which tends to decrease the open circuit voltage (OCV) and a consequent decrease in the overall power output. [8][9][10][11] The problem can be eliminated by incorporating dense and thin SDC on surface of thick SDC electrolyte as a blocking layer to improve the stability of the SDC electrolyte under the reducing environment and inhibit electronic current leakage. The pulsed laser deposition (PLD) technique is a promising method that offers better control of the deposited film properties, such as microstructures, density and stoichiometric with multi-component materials. 12,13 Furthermore, the PLD technique can operate at a low processing temperature without high post-annealing temperature, 14 which is useful for low temperature SOFC applications. Therefore, we researched lower heating temperature (600 • C) for the PLD procedure to fabricate dense and thin SDC layers on thick SDC electrolytes prepared by a solidstate reaction. In this paper, we used a simpler approach that uses a highly conductive and chemically stable on conductor electrolyte was developed by protecting a sintered SDC pellet with a thin SDC layer. The overall performance of the bilayer electrolyte turned out to be of great interest. The bilayer electrolyte was fabricated using a 1 mm thick pellet of anode-supported SD...

Sifat Termal, Elektrokimia Dan Struktur Mikro Oksida Perovskit Ganda Sebagai Material Katoda Sofc Beroperasi Pada Suhu Menengah

“…Elektroda referensi Ag (RE) ditempatkan dari WE sejauh 0,3-0,4 cm. Jarak tersebut dipilih untuk menghindari kesalahan pengukuran karena ketidaksejajaran dari elektroda kerja dan elektroda counter (the working and counter electrodes) [19][20][21]. Ag counter electrode (CE) ditempatkan di sisi lain dari cakram SDC.…”