Quantum Hall systems having Corbino geometry are expected to have a large Peltier coefficient \(\Pi _{rr}\) in the quantum Hall plateau region. We present an analytic formula for \(\Pi _{rr}\) calculated employing the spectral conductivity obtained based on the self-consistent Born approximation. The coefficient \(\Pi _{rr}\) is shown to have a large negative (positive) value just above (below) an integer Landau-level filling, with the absolute value \(|\Pi _{rr}|\) increasing with decreasing temperature or decreasing disorder, and approaching the saw-tooth shape \(- (E_{N_\textrm{F} \sigma _\textrm{F}}-\zeta )/e\) in the limit of vanishing disorder, where \(E_{N_\textrm{F} \sigma _\textrm{F}}\) is the highest occupied Landau level and \(\zeta \) is the chemical potential. As an initial attempt to experimentally observe the effect of the large \(|\Pi _{rr}|\) , we measure the electron temperature \(T_\textrm{out}\) near the outer perimeter of a Corbino disk, applying a radial dc current \(I_\textrm{dc}\) . The temperature \(T_\textrm{out}\) is observed to increase or decrease depending on the direction of \(I_\textrm{dc}\) and the sign of \(\Pi _{rr}\) as expected from the Peltier effect. Notably, \(T_\textrm{out}\) becomes lower than the bath temperature for outward (inward) \(I_\textrm{dc}\) in the region where \(\Pi _{rr} < 0\) ( \(\Pi _{rr} > 0\) ).
