The effect of synthesis gas composition on the performance of Ni-based solid oxide fuel cells

Abstract

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Page 1 AbstractAn increased interest in using hydrocarbons in solid oxide fuel cells for the production of power has 20 led to research into operation on synthesis (syn) gas, a mixture of hydrogen and carbon monoxide.Hydrocarbons are typically reformed, either internally or in an external reformer prior to the fuel cell, producing syngas with various H 2 :CO ratios depending on the hydrocarbon used. This paper examines the effect of varying the H 2 :CO ratio with respect to C 1 to C 4 steam reforming reactions and additionally a mixture containing a higher ratio of carbon monoxide. It was found that there was no 25 significant relationship between cell performance and H 2 :CO ratio when a high feed rate was employed. For low flow rates, however, the high carbon monoxide concentration resulted in a significant decrease in cell performance. It was determined that this was caused by reversible carbon deposition as opposed to a decrease in carbon monoxide reactivity.

High-Temperature Carbon Deposition on Oxide Surfaces by CO Disproportionation

“…are typically reformed either internally or in an external reformer prior to the fuel cell. The internal reforming operation results in a higher efficiency, a simplified SOFC system, and hence lower costs of the whole power generation system due to the exclusion of the prereformer. − However, this study is not focusing on the characterization of an internal reforming gas such as CH 4 ; rather its aim is to shed some light on the effect of pure CO, which is in combination with the H 2 part of synthesis gas and used for external reforming. − …”

Utilization of Glycerol and its Derivatives in a Nickel‐Based SOFC

“…[30] In order to ensure the system was completely sealed, customized glass seals were sourced from Kerafol and a pressure of 35 kPa applied to the cell, with a recorded gas loss of less than 4 %. Nickel and platinum mesh were used as the current collectors in the anode and cathode respectively with a ferrite metal alloy (Crofer 22AU) manifold used to supply gases to the cell.…”

Theoretical Approach to the Sulfidation of the BaTiO3(001) Surfaces and Its Effect on the H2 Oxidation Reaction and CH4 Sequential Dissociation

“…One recognizable feature of solid oxide fuel cells (SOFCs) is their fuel flexibility, covering hydrogen, ammonia, − synthesis gas, , biofuels, − oxygenates, , hydrocarbons, − carbon, , etc. In practical operation, most fuels contain impurities that may attack the active sites of the electrocatalysts, decreasing the performance and often influencing the long-term durability of the SOFC.…”