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. (1st August 2022)

• Record Type: Journal Article
• Authors: yao, Yao; Chen, Ting; Zhou, Zhihao; Huang, Zuzhi; Cai, Peijun; Xu, Lang; Wang, Shaorong
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 66(2022)
• Page Start: 28645
• Page End: 28654
• Publication Date: 2022-08-01
• Subjects: Solid oxide fuel cell -- La0.6Sr0.4Co1-xNixO3-δ mixed-oxide perovskites catalyst -- Internal reforming -- Methane dry reforming -- Carbon deposition; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.06.165
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: 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 La0.6 Sr0.4 Co1-x Nix O3-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 La0.6 Sr0.4 Co1-x Nix O3-δ oxides before and after reduction are characterized by X-ray diffraction (XRD). The texture properties, carbon deposition, CH4 and CO2 conversion rate of La0.6 Sr0.4 Co1-x Nix O3-δ catalysts are evaluated and compared. The peak power density of 739 mW cm −2 is obtained by a commercial SOFC with La0.6 Sr0.4 Co0.4 Ni0.6 O3-δ catalyst at 850 °C when using a mixture of CH4 : CO2 = 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 H2 atmosphere. The results indicate the benefits of inhibiting the carbon deposition on Ni-based anode through introducing the La0.6 Sr0.4 Co0.4 Ni0.6 O3-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. Highlights: Dry reforming of biogas between methane and CO2 is studied. The texture properties and catalytic activity of La0.6 Sr0.4 Co1-x Nix O3-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 La0.6 Sr0.4 Co0.4 Ni0.6 O3-δ catalyst exhibits 739 mW cm −2 at internal reforming of CH4 :CO2 = 2:1 at 850.