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Fuel cell ECSA – Electrochemistry – Application Note 11

Latest updated: May 6, 2020

Abstract

The state of the surface of an electrode can be very important depending on the experiment carried out. It should always be as smooth as possible to avoid parasite reactions. In the proper conditions, characteristic values can be determined such as the number of adsorption sites per surface unit for a given material.
In this application note, the active surface area of a Pt electrode is determined from a CV measurement using hydrogen underpotential deposition (HUPD).

 

Introduction

The state of surface of an electrode can be very important depending on the experiment carried out. It should always be as clean as possible to avoid parasitic reactions. It should also be, according to the electrode’s geometry, as smooth as possible. For example, in the case of a planar electrode, the surface should be as plane as possible on a microscopic scale. In the proper conditions, characteristic values can be determined such as the number of adsorption sites per surface unit for a given material.

The aim of this tutorial is to show the user how to determine the active surface of an electrode from a voltammetric curve giving I vsEwe.

 

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