. Room temperature XRD patterns of La_xSFNM (x=0, 0.1, 0.2, 0.3, 0.4)

. Surface morphologies of (a) SFNM ceramic pellets before reduction and (b-f) La_xSFNM ceramic pellets after reduction in humidified 10vol% H₂/N₂ (3vol% H₂O) at 750 ℃ for 4 h

. (a) SEM image of reduced La_0.3SFNM ceramic surface and (b-g) elemental mapping of La (b, blue), Sr (c, magenta), Fe (d, red), Ni (e, yellow), Mo (f, brown) and O (g, green)

. (a) Nyquist and (b) Bode plots of impedance data for symmetrical anode fuel cells, i.e., Nano-La_xSFNM@LSGM | LSGM | Nano-La_xSFNM@LSGM, operating in humidified H₂ (3vol% H₂O, 100 mL·min^-1) at 750 ℃, (c) distributions of relation time (DRT) plots of the data shown in (a) and (b)

. (a) Cross-sectional micrograph of measured fuel cell (Nano-La_0.3SFNM@LSGM|LSGM|Nano-SBSCO@LSGM), and (b) high magnification view of the impregnated catalyst

. (a) Voltage and power density versus current density for the functioning fuel cell (Nano-La_0.3SFNM@LSGM|LSGM| Nano-SBSCO@LSGM), measured in 97vol% H₂-3vol% H₂O at 100 sccm; (b) Peak power densities at different temperatures for single cells with varied La_xSFNM anodes

. Cell voltage as a function of operation time for the single fuel cell (Nano-La_0.3SFNM@LSGM|LSGM|Nano-SBSCO@LSGM), operated under constant current density at 550 and 650 ℃