La0.4Ba0.6Fe0.8Zn0.2O3−δas cathode in solid oxide fuel cells for simultaneous NO reduction and electricity generation

Zhou, Renjie; Bu, Yunfei; Xu, Dandan; Zhong, Qin

doi:10.1080/09593330.2013.856953

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…There are two ways to reduce NO x electrochemically. Solid oxide fuel cells (SOFCs) use NO x as an oxidant on the cathode side. − The technique not only removes NO x but also generates electric power. However, due to the low concentrations of NO x in automobile and industrial exhaust gases (generally less than 2%), the driving force of the SOFC reactions is very low. − In contrast, solid oxide electrolysis cells (SOECs), having the same components as SOFCs, reduce NO x on the cathode side under the driving of external electricity with controllable rates and high reduction selectivity for diesel engine exhaust. ,− Accordingly, high reduction rates can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Efficient Reduction of Low-Concentration NO via Dendritically Channeled Solid Oxide Cells

Wang

Shi

et al. 2021

ACS Appl. Energy Mater.

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Gaseous NO x emission is a critical environmental challenge. Since conventional methods for catalytic reduction of NO x from exhaust gases suffer from secondary pollution and low conversion efficiencies, electrochemical reduction via solid oxide cells (SOCs) offers great promises to effectively address these issues. Herein, for the first time, we demonstrated that low-concentration NO could be efficiently reduced over the same SOCs under both solid oxide fuel cell and solid oxide electrolysis cell conditions, which provides promising flexibility in cell operation conditions so that it would not be restrained by the availability of intermittent renewable power. To address the low-concentration issue (less than 2%) of NO, we proposed dendritically channeled supporting perovskite cathodes with an ultra-fast NO diffusion pathway to reaction sites at the cathode/electrolyte interface and more reaction sites for conducting NO reduction, resulting in an increase of 66.9–74.2% in electrolysis current density as well as stable operation. Moreover, such a channel structure not only effectively facilitated the coating of nanocatalysts via a simple impregnation process but also enabled the co-sintering of cathode supports and electrolytes at high temperatures during cell preparation owing to high sintering resistance. This work provides a protocol for rationally designable fabrication of high-performance dendritically channeled SOCs for applications in hazardous gas conversion.

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