Electrochemical performance and microstructure characterization of nickel yttrium‐stabilized zirconia anode

Abstract

A nickel and yttrium-stabilized zirconia (Ni-YSZ) composite is one of the most commonly used anode materials in solid oxide fuel cells (SOFCs). One of the drawbacks of the Ni-YSZ anode is its susceptibility to deactivation due to the formation of carbonaceous species when hydrocarbons are used as fuel supplies. We therefore initiated an electrochemical study of the influence of methane (CH 4 ) on the performance of Ni-YSZ anodes by examining the kinetics of the oxidation of CH 4 and H 2 over operating temperatures of 600-800 C. Anode performance deterioration was then correlated with the degree of carbonization observed on the anode using ex-situ X-ray powder diffraction and scanning electron microscopy techniques. Results showed that carbonaceous species led to a significant deactivation of Ni-YSZ anode toward methane oxidation. V

Innovations in Electric Current-Assisted Sintering for SOFC: A Review of Advances in Flash Sintering and Ultrafast High-Temperature Sintering

“…FS resulted in a 63% reduction in the total electrical resistance of the single cell, as compared to conventional sintering. One of the main obstacles in the development of SOFC applications is dealing with carbon deposition [106,107]. The study conducted by Hao et al [108] utilized FS to fabricate anode-supported SOFC single cells with La 0.2 Sr 0.7 TiO 3 (LST), Ni and YSZ (LST-Ni/YSZ) gradient materials, which simultaneously possess coke resistance and high conductivity.…”

Sustainable Energy Application

“…CV experiments (sweep rates from 2 to 400 mV/s) were performed using an EG&G PARC 273 potentiostat or a Solartron 1287 interface, with control and data collection handled by Corrware software. The carbon deposits were reversibly removed by heating the sample in air [176]. For the impedance analysis, a Solartron 1255 frequency response analyzer was coupled with the potentiostat.…”

SrO Doping Effect on Fabrication and Performance of Ni/Ce₁₋<i>_x</i>Sr<i>_x</i>O₂₋<i>_x</i> Anode-Supported Solid Oxide Fuel Cell for Direct Methane Utilization

“…The ZrO 2 -based SOFC system, however, seems to allow stable operation only for H 2 fuels due to the susceptibility to deactivation of the Ni and ZrO 2 -based cermet anode when HC fuels are used. 6,7) Wei et al recently reported a review on the progress in Ni-based anode materials for direct HC SOFCs. 8) They suggested that promising Ni-based anode materials include the noble metals, CeO 2 , Ba-containing oxides, and titanium oxides.…”