Journal Article10.1039/C5RA15980F
A high performance ceria-based solid oxide fuel cell operating on underground coal gasification gas
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TL;DR: In this article, the authors investigated the equilibrium species and theoretical electromotive forces (EMF) of cells fed with 3% H2O humidified simulated underground coal gasification (UCG) gas, and the performance of an anode-supported NiO-Gd0.9O2−δ (GDC)
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Abstract: This paper investigates the equilibrium species and theoretical electromotive forces (EMF) of cells fed with 3% H2O humidified simulated underground coal gasification (UCG) gas, and the performance of an anode-supported NiO-Gd0.1Ce0.9O2−δ (GDC)‖GDC‖Ba0.9Co0.7Fe0.2Nb0.1O3−δ (B0.9CFN) cell operated with the UCG gas. The results show that EMF values are always above 1.05 V, and the UCG gas fed cell exhibits maximum power densities of 0.151, 0.299, 0.537 and 0.729 W cm−2 at 500, 550, 600 and 650 °C, respectively, slightly inferior to that of hydrogen fed cell of 0.330, 0.544, 0.765 and 0.936 W cm−2, respectively, as a result of the sluggish reaction kinetics of the UCG gas at the anode. However, the synergy between slow anode reaction kinetics and the sufficient and fast migration of oxygen ions to the anode, attributed to the using of GDC electrolyte and B0.9CFN cathode, suppresses carbon deposition at intermediate temperatures. Only a slight current density decrease ranging from 0.2959 to 0.2790 A cm−2 is observed during the 480 h of durability testing under a constant 0.7 V output voltage at 600 °C for the UCG gas fed cell. The subsequent SEM inspection of the tested cell indicated no measurable carbon deposition on the anode surface, thereby demonstrating that UCG gas is a promising fuel for utilization in SOFCs.
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Chemical solution deposition of pure and Gd-doped ceria thin films: Structural, morphological and optical properties
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References
Appraisal of Ce1−yGdyO2−y/2 electrolytes for IT-SOFC operation at 500°C
TL;DR: In this article, the authors evaluated thermodynamic and electrical conductivity data to select the most appropriate electrolyte composition for IT-SOFC operation at 500°C and found that the Gd 3+ ion is the preferred dopant, compared to Sm 3+ and Y 3+, at this temperature.
2K
Recent anode advances in solid oxide fuel cells
Chunwen Sun,Ulrich Stimming +1 more
TL;DR: In this article, a review of the recent developments of anode in SOFCs with principal emphasis on the material aspects is presented, and the mechanism and kinetics of fuel oxidation reactions are also addressed.
588
An Octane-Fueled Solid Oxide Fuel Cell
Zhongliang Zhan,Scott A. Barnett +1 more
TL;DR: A solid oxide fuel cell that combines a catalyst layer with a conventional anode, allowing internal reforming of iso-octane without coking and yielding stable power densities of 0.3 to 0.6 watts per square centimeter is described.
534
Underground coal gasification: From fundamentals to applications
TL;DR: Underground coal gasification (UCG) is a promising option for the future use of un-worked coal as mentioned in this paper, which can be used for industrial heating, power generation or the manufacture of hydrogen, synthetic natural gas or diesel fuel.
407
Direct operation of solid oxide fuel cells with methane fuel
TL;DR: In this article, the Ni-YSZ anode supported direct-methane SOFCs on methane fuel was described and power densities as high as 0.52 W/cm2 at 700 °C and 1.27 W/ cm2 at 800 °C were observed.
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