Hydrogen evolution reaction on Titanium and oxide-covered titanium electrodes

✍ Scribed by M. W. Khalil; M. A. Abdel Rahim

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: English
• Weight: 465 KB
• Volume: 22
• Category: Article
• ISSN: 0933-5137
• DOI: 10.1002/mawe.19910221007

✦ Synopsis

Abstract

The kinetics of HER on Ti electrodes in H~2~SO~4~ of various concentrations in the pH range of 0.24–1.88 was studied. Cathodic Tafel lines were measured potentiodynamically at a scan rate 1.0 mVs^−1^ within the H~2~ evolution potential range. Linear parallel Tafel lines of a slope of 152 mVdecade^−1^ were obtained. A value of 0.73 was calculated for the reaction order wrt a~H~^+^ using the exchange cd, i~0~ Tafel lines measured on oxide covered electrodes showed three deviations from linearity. An attempt was made to explain the deviations in terms of hydride formation and chemical oxide dissolution. Tafel slopes of 152 mVdecade^−1^ were also observed for the HER on oxide‐covered electrodes. The nature and composition of the oxide did not depend on the electrolyte in which the oxides were formed.