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Figure 11 (top) shows that decreasing the anode thickness and anodic diffusion path reduces the anode diffusion polarization, which cause an enhancement of the exergy efficiency of the SOFC.
Decreasing the anode thickness enhances the exergy efficiency.
Decreasing the anode tortuosity increases the exergy efficiency.
In Fig. 6 (bottom), the increase of temperature while decreasing the anode tortuosity to 2 reduces the anode pore diffusion coefficient, which caused the anode diffusion overpotential to rise.
With the lateral venting configuration, CO2 gas can release directly from the anode diffusion layer of membrane electrode assembly (MEA), which prevents CO2 gas accumulating on the anode and decreasing the anode mass transportation.
The performance of the anode-supported SOFC fuelled by ethanol can be improved by either increasing temperature, pressure, degree of pre-reforming of ethanol, and steam to ethanol molar ratio or decreasing the anode thickness and fuel flow rate at inlet.
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From this section analysis, we conclude that increasing the porosity from 0.4 to 0.5 decreases the anode diffusion polarization which caused the exergy efficiency to increase and decreasing the tortuosity from 5 to 2 decreases the anode diffusion polarization which caused the exergy efficiency to increase.
The presence of CsNi2F6, which is a highly oxidized nickel compound, gave a high electronic conductivity to the film and decreased the anode overvoltage.
From the above study, it is concluded that to decrease the anode diffusion polarization to the range below 0.001 V and to enhance the exergy and energy efficiency, the following parameters are recommended: Increasing the anode porosity increases the exergy efficiency.
The microbial growth on the anode has a beneficial effect on the kinetics of the bio-electrochemical reaction as it decreases the anode activation losses due to increased biocatalyst density [ 10].
Ramasamy et al. [ 10] reported that the anode impedance from two-chamber MFC on day 1 and week 3 were estimated to be 174 Ω and 32 Ω, respectively, indicating that the growth of the microbial biofilm was found to decrease the anode polarization resistance and facilitate the kinetics of the electrochemical reactions.
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