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← ScienceWhich outcome influences reaction rate in a solid oxide fuel cell electrode when operating at higher temperature?
A)Electrode polarization decreases exponentially✓
B)Ionic conductivity of electrolyte increases linearly
C)Electronic band gap widens noticeably
D)Activation energy gets affected through tunnel effect
💡 Explanation
When temperature rises in an SOFC, the electrode polarization decreases exponentially because the increased thermal energy reduces the activation overpotential for charge transfer reactions, enhancing the current density. Therefore polarization is decreased, rather than band gap widening, electrolyte linearity as tunneling is relevant only at absolute zero.
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