Effects of Sn doping on the manufacturing, performance and carbon deposition of Ni/ScSZ cells in solid oxide fuel cells

摘要

This work demonstrates the effect of tin (Sn) doping on the manufacturing, electrochemical performance, and carbon deposition in dry biogas-fuelled solid oxide fuel cells (SOFCs). Sn doping via blending in technique alters the rheology of tape casting slurry and increases the Ni/ScSZ anode porosity. In contrast to the undoped Ni/ScSZ cells, where open-circuit voltage (OCV) drops in biogas, Sn-Ni/ScSZ SOFC OCV increases by 3%. The maximum power densities in biogas are 0.116, 0.211, 0.263, and 0.314 W/cm(2) for undoped Ni/ScSZ, undoped Ni/ScSZ with 3 wt% pore former, Sn-Ni/ScSZ and Sn-NiScSZ with 1 wt% pore former, respectively. Sn-Ni/ScSZ reduces the effect of the drop in the maximum power densities by 26%-36% with the fuel switch. A 1.28-2.24-fold higher amount of carbon is detected on the Sn-Ni/ScSZ samples despite the better electrochemical performance, which may reflect an enhanced methane decomposition reaction. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.