Effect of Pr addition into Ni based anode on direct methanol fueled solid oxide fuel cell

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2020-02, Vol.859, p.113846, Article 113846
• Main Authors: Li, Ping, Wang, Rujie, Yan, Fei
• Format: Article
• Language: English
• Subjects: Carbon deposition; Electrochemical performance; Methanol; Ni-based anode; Praseodymium (Pr); Solid oxide fuel cell
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2020.113846

Praseodymium oxides (Pr4O7 and Pr6O11) were added into Ni-Mo-Ce0.8Sm0.2O1.9 (SDC) anode. The single cell with PrO-Ni-Mo-SDC as the anode and SDC-carbonate composite as the electrolyte showed a higher cell performance and a lower polarization resistance with H2 as the fuel. It is hypothesized that PrO-Ni-Mo-SDC possesses more lattice oxygen atoms, and the Ce4+ and Ni2+ in PrO-Ni-Mo-SDC have lower reduction temperatures than those in Ni-Mo-SDC. Using methanol as the fuel, the maximum power density of the single cell with PrO-Ni-Mo-SDC as the anode was 594 mW cm−2 at 700 °C, which was slightly lower than that of the single cell with Ni-Mo-SDC as the anode. However, the single cell with PrO-Ni-Mo-SDC as the anode showed a better stability, which is probably due to its better coking resistance. The amount and the graphitization degree of the carbon deposited on PrO-Ni-Mo-SDC were lower than those of the carbon on Ni-Mo-SDC. [Display omitted] •PrO-Ni-Mo-SDC shows higher reducibility and more Ni-Mo alloy.•The polarization resistance of PrO-Ni-Mo-SDC is 0.38 Ω cm2 in H2 at 700 °C.•Pr doping increases the stability of the cell in methanol.•The difference on coking resistance is studied.