Investigation of La0.6Sr0.4Co1-xNixO3-δ (x=0, 0.2, 0.4, 0.6, 0.8) catalysts on solid oxide fuel cells anode for biogas dry reforming.

The introduction of catalyst on anode of solid oxide fuel cell (SOFC) has been an effective way to alleviate the carbon deposition when utilizing biogas as the fuel. A series of La 0.6 Sr 0.4 Co 1-x Ni x O 3-δ (x = 0, 0.2, 0.4, 0.6, 0.8) oxides are synthesized by sol-gel method and used as catalysts precursors for biogas dry reforming. The phase structure of La 0.6 Sr 0.4 Co 1-x Ni x O 3-δ oxides before and after reduction are characterized by X-ray diffraction (XRD). The texture properties, carbon deposition, CH 4 and CO 2 conversion rate of La 0.6 Sr 0.4 Co 1-x Ni x O 3-δ catalysts are evaluated and compared. The peak power density of 739 mW cm−2 is obtained by a commercial SOFC with La 0.6 Sr 0.4 Co 0.4 Ni 0.6 O 3-δ catalyst at 850 °C when using a mixture of CH 4 : CO 2 = 2:1 as fuel. This shows a great improvement from the cell without catalyst for internal dry reforming, which is attributed to the formation of NiCo alloy active species after reduction in H 2 atmosphere. The results indicate the benefits of inhibiting the carbon deposition on Ni-based anode through introducing the La 0.6 Sr 0.4 Co 0.4 Ni 0.6 O 3-δ catalyst precursor. Additionally, the dry reforming technology will also help to convert part of the exhaust heat into chemical energy and improve the efficiency of SOFC system with biogas fuel. • Dry reforming of biogas between methane and CO 2 is studied. • The texture properties and catalytic activity of La 0.6 Sr 0.4 Co 1-x Ni x O 3-δ catalysts are examined systematically. • The presence of NiCo alloy active species can possible alleviate the carbon deposition of anode layer of single cell. • The single cell with La 0.6 Sr 0.4 Co 0.4 Ni 0.6 O 3-δ catalyst exhibits 739 mW cm−2 at internal reforming of CH 4 :CO 2 = 2:1 at 850. [ABSTRACT FROM AUTHOR]