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Effect of proton-conduction in electrolyte on electric efficiency of multi-stage solid oxide fuel cells.

Abstract：

:Solid oxide fuel cells (SOFCs) are promising electrochemical devices that enable the highest fuel-to-electricity conversion efficiencies under high operating temperatures. The concept of multi-stage electrochemical oxidation using SOFCs has been proposed and studied over the past several decades for further improving the electrical efficiency. However, the improvement is limited by fuel dilution downstream of the fuel flow. Therefore, evolved technologies are required to achieve considerably higher electrical efficiencies. Here we present an innovative concept for a critically-high fuel-to-electricity conversion efficiency of up to 85% based on the lower heating value (LHV), in which a high-temperature multi-stage electrochemical oxidation is combined with a proton-conducting solid electrolyte. Switching a solid electrolyte material from a conventional oxide-ion conducting material to a proton-conducting material under the high-temperature multi-stage electrochemical oxidation mechanism has proven to be highly advantageous for the electrical efficiency. The DC efficiency of 85% (LHV) corresponds to a net AC efficiency of approximately 76% (LHV), where the net AC efficiency refers to the transmission-end AC efficiency. This evolved concept will yield a considerably higher efficiency with a much smaller generation capacity than the state-of-the-art several tens-of-MW-class most advanced combined cycle (MACC).

journal_name

Sci Rep

journal_title

Scientific reports

authors

Matsuzaki Y,Tachikawa Y,Somekawa T,Hatae T,Matsumoto H,Taniguchi S,Sasaki K

doi

10.1038/srep12640

subject

Has Abstract

pub_date

2015-07-28 00:00:00

pages

12640

issn

2045-2322

pii

srep12640

journal_volume

5

pub_type

杂志文章

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