The Differentiating Polarization Curve Technique for the Tafel Parameter Estimation

Osami Seri,Burapornpong Siree

doi:10.3390/catal7080239

Abstract

An experimentally obtained polarization curve for the hydrogen evolution reaction on silver in a 0.5 mol dm−3 solution was investigated using an electrochemical curve technique named the differential polarization method (DPM). The exchange current density estimated by the Tafel extrapolation method (TEM) and the DPM were compared and assessed from points of simple and more accurate handling. It is shown that the DPM has two advantages: (1) proper reading of the Tafel slope region and (2) elimination of the undesirable physical factors such as oxide film and solution resistance.

Highlights

Special attention has been paid to the hydrogen evolution reaction in academic fields and industrial applications such as fuel cell research, battery development, and corrosion engineering
Some reports on silver electrode in the same H2 SO4 solution environments vary from 10− 2.7 to 10−4.9 mA cm−2 —a difference of about two orders of magnitude [4]
We have developed a technique termed the “differential polarization method (DPM)” [8]

Summary

Introduction

Special attention has been paid to the hydrogen evolution reaction (her) in academic fields and industrial applications such as fuel cell research, battery development, and corrosion engineering. The major interest has been in the kinetic area, especially the rate of her, because mass production of hydrogen becomes a key technology to sustain the future energy society. The kinetic her is usually evaluated from the exchange current density (i0 ). It is often said that some of them cannot be accurately reproduced and are probably unreliable [5,6] Such inconclusiveness data may be due to individual errors and difficulties in reading the proper region when applying the TEM. It is necessary to pay more attention to the physical factors such as solution resistance and oxide film on the electrode [8,9,10,11]

Objectives

Methods

Discussion

Conclusion