A novel Ni/ceria-based anode for metal-supported solid oxide fuel cells

Model System Supported Impedance Simulation of Composite Electrodes

“…A typical impedance spectrum measured at 740 °C in an atmosphere containing 25 mbar H 2 and 25 mbar H 2 O (balance Ar) is depicted in Figure a. The spectrum consists of three well‐separated main features: (i) a high frequency axis intercept corresponding to the ion transport resistance of the electrolyte, (ii) a depressed intermedium frequency feature, which is assigned to the impedance of the composite electrode, and (iii) a low frequency arc due to gas diffusion limitation . These three contributions are also indicated by the arrows below the spectrum in Figure a.…”

“…First, for Z ode the impedance of the transmission line discussed in this paper was used (Eqs. (9)-(12)) with R ion , R react, and C ode as fit parameters for an electrode thickness of 15 mm [12] (R eon was fixed to 10 5 S cm -1 for Ni; C ion and C eon were neglected, since they are too small to be visible). With this approach the red dashed curve in Figure 8a was obtained.…”

“…Therefore, the question which cermet will be electrochemically more active cannot be straightforwardly answered from these model experiments. In addition, also the microstructure of the respective cermets plays an important role. Owing to different sintering behavior of YSZ and GDC/SDC as well as to different wetting behavior of Ni on these oxides, the microstructure of the Ni/YSZ and Ni/ceria cermets can be expected to be also significantly different , . This additional difference makes prediction of electrochemical performance even more challenging.…”

“…Due to their elevated operating temperature, this type of cells offers rather wide fuel flexibility from hydrogen to hydrocarbon-based fuels or alcohols, thus making them compatible to the existing fuel infrastructure [1][2][3][4][5][6][7]. Owing to this fuel flexibility, SOCs can play important roles in future energy supply scenarios: (i) SOFCs for stationary electricity generation [4,8], (ii) metal-supported SOFCs for mobile applications [9][10][11][12][13], and (iii) SOECs for storage of excess electricity in the form of chemical bonds [2,[14][15][16].…”

Heat Treatment Effect on the Phase and Morphology of NiO-BCZY Prepared by an Evaporation and Decomposition of Solution and Suspension Method

“…Ceramic-metal composite or 'cermet' such as nickel-yttria stabilized zirconia (Ni-YSZ) is frequently being employed as conventional or standard anode material, particularly for high temperature oxide ion conducting SOFC (O 2--SOFC) (Aruna et al 1998;Koide et al 2000;Marinšek et al 2000;Rojeck-Wockner et al 2016). As nowadays research is focusing towards development of intermediate temperature proton conducting SOFC (H + -SOFC), a cermet anode material that works compatibly with proton conductor electrolyte materials has been developed (Bae & Choi 2015;Coors & Manerbino 2011;Rainwater et al 2012;Yamaguchi et al 2016;Yan et al 2010).…”