Autor(es)

Vilela, Vanessa B. ; Fournet-Fayard, Franck ; Steil, Marlu C. ; Thyssen, Vivian V. ; de Florio, Daniel Z. ; Ferlauto, Andre S. ; Fonseca, Fabio C.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Power Sources; v. 656, p. 13-pg., 2025-11-15.

Resumo

Separating catalytic and electrochemical reactions at the fuel electrode of the direct methane solid oxide fuel cell (SOFC) produces syngas and C-2 products (ethane and ethylene), while cogenerating electricity. A SOFC-compatible La0.5Ce0.5O2-delta catalyst is first validated for the oxidative coupling of methane (OCM) reactions with O-2 and H2O oxidizing agents in a fixed-bed reactor. It is then applied as a catalytic layer on the current collector of a standard nickel/yttria-stabilized zirconia (Ni/YSZ) anode. A systematic study of operating parameters such as temperature, fuel concentration, flow rate, and applied current reveals a maximum C-2 production rate of 1.5 mmol min(-1) cm(-2) and over 50 % selectivity for syngas (H-2/CO similar to 1). Experimental results, supported by thermodynamic data, indicate that steam generated by electrochemical hydrogen oxidation promotes both steam reforming and methane oxidative coupling within the catalytic layer, ensuring stable SOFC operation. This innovative fuel electrode configuration, featuring an OCM-active layer, enables efficient catalytic-assisted conversion of methane into value-added products within a SOFC. (AU)

• Processo FAPESP: 24/19207-9 - Células de óxidos sólidos para a conversão de metano
• Beneficiário: Fabio Coral Fonseca
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 23/14931-8 - Dispositivos eletroquímicos avançados de conversão de moléculas e produção de energia
• Beneficiário: Fabio Coral Fonseca
• Modalidade de apoio: Auxílio à Pesquisa - Temático