All-solid-state direct carbon fuel cells with thin yttrium-stabilized-zirconia electrolyte supported on nickel and iron bimetal-based anodes. (8th June 2016)

• Record Type: Journal Article
• Authors: Yu, Fangyong; Zhang, Yapeng; Yu, Liang; Cai, Weizi; Yuan, Lili; Liu, Jiang; Liu, Meilin
• Is Part Of: International journal of hydrogen energy. Volume 41:Number 21(2016)
• Page Start: 9048
• Page End: 9058
• Publication Date: 2016-06-08
• Subjects: Solid oxide fuel cell -- Direct carbon -- Nickel-iron composite anode -- All-solid-state -- Anode-supported; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2016.04.063
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Solid oxide fuel cells (SOFCs) with thin yttrium-stabilized-zirconia (YSZ) electrolyte supported on composite anode of nickel-iron bimetal and YSZ are prepared and operated directly on Fe-loaded activated carbon fuel, without any liquid medium or purging gas. The composition of the anode is represented as Ni1- x Fe x O δ ( x = 0, 0.05, 0.1, 0.2, 0.3)-YSZ. Experiment result shows that such kind of all-solid-state direct carbon solid oxide fuel cells (DC-SOFCs) perform well at 800 °C, giving maximum output power densities in the range of 425–529 mW cm −2 . Similar to the case of a SOFC operated on hydrogen fuel, a small amount of Fe addition into the Ni-based anode can improve the performance of a DC-SOFC and the optimum composition is x = 0.1. A DC-SOFC with Ni0.9 Fe0.1 O δ -YSZ anode, loaded with 2.5 g Fe-loaded activated carbon fuel, is steadily operated at a constant current density of 0.1 A cm −2 for 15 h at 800 °C. The anodes and the DC-SOFCs are characterized through XRD, AC impedance spectroscopy, and SEM measurements. The superior performance of the Fe-added anode is analyzed accordingly. Highlights: Ni1- x Fe x O δ -YSZ anode-supported DC-SOFCs are systematically investigated. Anode of DC-SOFCs can be reduced in situ by CO generated from Boudouard reaction. A proper amount of Fe addition in anode can improve DC-SOFC performance. A DC-SOFC with optimal anode of x = 0.1 gives MPD of 529 mW cm −2 at 800 °C. DC-SOFC of x = 0.1 run at 0.1 A cm −2 shows a stable plateau of 0.86 V of 15 h.