Carbon Monoxide Fueled Cone-Shaped Tubular Solid Oxide Fuel Cell with (Ni_0.75Fe_0.25-5%MgO)/YSZ Anode

Abstract

An anode-supported cone-shaped tubular solid oxide fuel cell (SOFC) with (Ni0.75Fe0.25-5%MgO)/YSZ anode is prepared and is directly operated on dry and moist CO fuel, respectively. At 800°C, the cell exhibits a maximum power density (MPD) of 424 mWcm−2 for dry CO and 388 mWcm−2 for moist CO. The durability test results show no significant degradation in performance for this kind of cell operated on either dry or moist CO after an operation time of 40 h at a constant current of 83 mA cm−2 at 800°C, while the cell with Ni/YSZ anode, in comparison, fails rapidly. A two-cell-stack based on the above mentioned SOFCs is fabricated and tested by direct utilization of moist CO as fuel. The SOFC stack presents an open circuit voltage (OCV) of 2 V and a maximum output power of 4 W at 800°C. And it exhibits good stability and dependability during an operation time of 90 h. The results demonstrate that (Ni0.75Fe0.25-5%MgO) /YSZ would be a promising anode for SOFC operating on CO or CO-contained fuels.

An experimental investigation on a single tubular SOFC for renewable energy based cogeneration system

“…The electrical efficiency found in the present study is little bit lower compared to the literature for the lower fuel utilization factor. By doing an experimental investigation on a cone shaped tubular SOFC, Liu et al [13] got the maximum DC output voltage about 2 V and electrical power 4 W at the operating temperature of 800°C by using CO as fuel, where in this study the maximum DC voltage about 1.1 V and electrical power about 1.58 W at the operating temperature of 750°C was obtained by using hydrogen as fuel. From an anode supported tubular SOFC, Guerra et al [14] got the highest efficiency about 43.4% with U f = 0.7, when the output current was 17.5 A and operating temperature was 800°C.…”

“…The module was designed to handle the electrical load about 700 W. The investigation illustrates that the module would show 47% of low heat value (LHV) if the fuel utilization factor is considered about 0.75. A cone shaped tubular SOFC with (Ni 0.75 Fe 0.25 -5%MgO)/YSZ anode was investigated experimentally by Liu et al [13]. The investigation confirmed that the output DC voltage of 2 V and power of 4 W were found by using the CO fuel in both moist and dry modes at the operating temperature of 800°C.…”

Process Investigation of a Solid Carbon-Fueled Solid Oxide Fuel Cell Integrated with a CO2-Permeating Membrane and a Sintering-Resistant Reverse Boudouard Reaction Catalyst

“…Therefore, the effect of the reverse Boudouard reaction on the cell performance was negligible. The PPDs of CAB 1 were 200, 267, 292, 327, 362, and 410 mW cm –2 at 725, 750, 775, 800, 825, and 850 °C, respectively, comparable to the values reported in the literature for applying CO fuel. − Such high power outputs demonstrated the excellent electrochemical activity of the CAB for power generation operating on carbon fuel. At the lower temperature of 725 °C, however, serious concentration polarization appeared at the current density higher than 200 mA cm –2 , suggesting that the formation rate of gaseous CO from the catalytic reverse Boudouard reaction was likely not sufficiently fast to meet the rate of CO electrochemical oxidation over the SOFC anode needed for producing the required amount of electricity.…”

Material design and performance of carbon monoxide‐fueled solid oxide fuel cells: A review

“…The main challenge for the development of CO-fueled SOFCs is the low coking tolerance of Ni-based anodes to CO. [55][56][57][58][59][60] 3 | MATERIAL DEVELOPMENT OF CO-FUELED SOFCS…”

“…As reported, Fe and MgO could stabilize the Ni-yttria-stabilized zirconia (Ni-YSZ) electrode for CO-fueled SOFCs. 58 In the elaborate anode composition of (Ni 0.75 Fe 0.25 -5%MgO)-YSZ, Ni/Fe would be an excellent catalyst, while MgO could enhance the structural stability of the anode via neutralizing the stress produced by carbon fiber growth. It was found that the composite anode with MgO showed a relatively "clean" surface after its operation in CO, whereas more small clusters were produced in the Ni-YSZ anode, blocking its pores (Figure 2).…”