Investigation of the electrochemical active thickness of solid oxide fuel cell anode

Modeling Analysis of Bi-Layer Ni-(ZrO2)x(Y2O3)1−x Anodes for Anode-Supported Intermediate Temperature-Solid Oxide Fuel Cells

“…The results reported in Table 3 show that there is a correlation between the effective ionic resistivity ρ eff io,AL of the AL, the EAT and the electrode 1/R p in the range of AL compositions taken into consideration (2 b -2 d ): the lower ρ eff io,AL , the larger the EAT and 1/R p . This finding is in agreement with the results reported by [36] for single-layer SOFC electrodes. However, Figure 2 shows that a further reduction of Ni content of the AL below that of Case 2 b , leads to a decreased 1/R p .…”

“…In this sense, our approach is different from that pursued in previous literature [35], where the possibility of simulating a homogeneous one-layer anode as a fictitious bi-layer anode has been investigated. This latter method has involved a first step of identification of the electrochemically active thickness (EAT) [36], defined as the electrode thickness close to the E/E interface where 99% of the electrochemical reaction takes place (i.e., 99% of the ionic current is transferred into electronic current). Then, the possibility of simulating the EAT through a detailed approach, and the remaining part of the electrode through a simplified approach, has been demonstrated, with interesting computational advantages [35].…”

“…In [35], the EAT has been proved to grow by increasing the operating temperature. The extension of the EAT has been further investigated in a recent literature work [36], where it has been demonstrated to increase by decreasing the exchange current density of the electrochemical reaction or the effective ionic resistivity of the electrode.…”

Vanadium microfluidic fuel cell with novel multi-layer flow-through porous electrodes: Model, simulations and experiments

“…Regarding the operation of the MFC, a balance between performance and cost is imperative when taking into account the novel catalyst materials and the energy consumed by the modification processes. It is thus intriguing to realize whether it is necessary to modify every part of the porous electrode operating with nonuniform reaction rates [61][62][63]. Research on optimal electrode structures for other fuel cell types has been reported in the literature [64][65][66][67][68][69].…”

A Simple Expression for the Tortuosity of Gas Transport Paths in Solid Oxide Fuel Cells’ Porous Electrodes

“…However, it is a challenging task to simulate the gas transport in electrodes accurately because the presence of the solid phase causes the transport paths of gas to deviate from straight lines. In order to take the effect of tortuous gas transport paths into account, the effective gas diffusion coefficient D eff is usually corrected by introducing the tortuosity, which is commonly expressed as [5][6][7][8][9]:…”