Influence of the Bias Substrate Power on the GDC Buffer Layer

Abstract

Gadolinia Doped Ceria (GDC) buffer layers were synthesized by reactive magnetron sputtering under different bias powers applied to the substrate holder. All as-deposited coating present a face centered cubic (f.c.c) structure of ceria with dense and adhesive morphology. Only the film deposited under 80 W bias power applied to the substrate does not exhibit cracks after an annealing treatment during 2 h under air at 1000°C. The performance of the cell is 670 mW.cm -2 @ 800 mA.cm -2 at 790°C and no degradation was observed after 150 hours.

GDC Buffer Layer Synthesized by Reactive Magnetron Sputtering: Effect of Total Pressure and Thickness on SOFC Performances

“…In a previous study [18], we highlighted that the synthesis of the buffer layer of GDC of 1-µm thickness, under a total pressure of 0.5 Pa and the application of a polarization of the sample holder allows to improve the OCV of the fuel cell. As shown in Table 1, a polarization voltage of 80 W provided the best OCV.…”

“…In the present study, the discharge current was fixed at 2.5 A; the bias power applied on the porte substrate holder was 80 W and the total pressure was around 0.1 or 0.5 Pa for 10 or 50 sccm argon flow rate. For more details concerning the GDC buffer layer see our previous work focus on the effect of bias power [18].…”

“…The distinctiveness of the Open Flanges Set-Up was that no sealing was required: the SOFC cell was simply squeezed between two alumina felts; a nickel foam on the anode side and a grid on the cathode side provided current collection. A scheme of the experimental setup is given in a previous study [18], one can also consult the Fiaxell website (https://fiaxell.com). A fuel flow rate between 100 to 200 (mL.min −1 ), depending on the cell size, was enough to ensure an OCV close to the theoretical value as shown for two different cells.…”

Exsolution of Ni Nanoparticles from A-Site-Deficient Layered Double Perovskites for Dry Reforming of Methane and as an Anode Material for a Solid Oxide Fuel Cell

“…The deposition stage is monitored by a closed-loop control plasma emission monitoring system using optical emission spectroscopy. In the present study, the discharge current is fixed at 2.5 A and the total pressure is ∼ 0.2 Pa. Further details were reported elsewhere . The electrode slurry was prepared by mixing 60 wt % of R-PBMNx powder with 40 wt % of α-terpineol (99% Acros Organics)/ethylcellulose (Aldrich) (95/5 w/w).…”

“…In the present study, the discharge current is fixed at 2.5 A and the total pressure is ∼ 0.2 Pa. Further details were reported elsewhere. 38 The electrode slurry was prepared by mixing 60 wt % of R-PBMNx powder with 40 wt % of αterpineol (99% Acros Organics)/ethylcellulose (Aldrich) (95/5 w/ w). The mixture was ground with ethanol in a planetary ball mill and then screen-printed on both sides of the CGO/8YSZ electrolyte which was subsequently sintered in air at 1100 °C for 3 h. Circular gold meshes were fixed to both electrode surfaces and connected to the external system The effective electrode area was 0.95 cm 2 and its thickness was estimated at ∼30 μm from cross-section SEM images.…”