To deconvolve the DRT, the problem in ( ) was first normalized with respect to the RR polarization resistance, 𝑅 , obtained by integrating 𝛾 (log 𝜏 , 𝜆 ) from log 𝜏 to log 𝜏 with the trapezoidal rule. Then, the optimization in was carried out with Adam algorithm for 2,000 steps .