Ethanol-fueled metal supported solid oxide fuel cells with a high entropy alloy internal reforming catalyst

Hu, Boxun; Lau, Grace; Lee, Kevin X.; Belko, Seraphim; Singh, Prabhakar; Tucker, Michael C.

doi:10.1016/j.jpowsour.2023.233544

Ethanol-fueled metal supported solid oxide fuel cells with a high entropy alloy internal reforming catalyst

Journal Article · Fri Aug 25 00:00:00 EDT 2023 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2023.233544· OSTI ID:1997267

^[1]; Lau, Grace ^[2]; Lee, Kevin X. ^[3]; Belko, Seraphim ^[3]; Singh, Prabhakar ^[3]; ^[2]

Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Berkeley National Lab
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
University of Connecticut, Storrs, CT (United States)

High-performance metal supported solid oxide fuel cells (MS-SOFC) with an integrated high entropy alloy (HEA) internal reforming catalyst (IRC) are demonstrated for transportation applications using ethanol and methanol as fuels. Addition of the HEA IRC dramatically improves cell performance and stability when using ethanol/water blend fuel. Absence of carbon deposition predicted by thermodynamic calculations is confirmed by Raman spectroscopy analysis of posttest anodes. Optimal catalyst processing (deposition technique, loading, firing temperature) and cell operation conditions (flow rates, temperature, fuel compositions) are explored. Infiltrated HEA reforming catalyst provides a highly porous structure and low catalyst loading (6 mg cm^–2). The designed structure and catalysts achieve small mass transport resistances in the fuel electrode (26.2 s m^–1) and oxygen electrode (41.6 s m^–1). The best ethanol concentration (60:40 v% ethanol: water) provides 0.83 W cm^–1 at 700 °C, without carbon deposition. The ethanol-fueled MS-SOFC is operated for 500 h, including five thermal cycles. As a result, cell evolution is similar to that reported previously for hydrogen fuel; nickel aggregation and chromia deposition were the major observed changes, and carbon formation can be avoided even after long-term operation.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1997267

Alternate ID(s):: OSTI ID: 2234036
OSTI ID: 1997559

Journal Information:: Journal of Power Sources, Journal Name: Journal of Power Sources Vol. 582; ISSN 0378-7753

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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