Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 38, Issue 8, Pages 3137-3145Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2012.12.102
Keywords
Hydrogen evolution reaction; Alkaline water electrolysis; Platinum-rare earth electrodes; Kinetic parameters
Categories
Funding
- FCT, the Portuguese Foundation for Science and Technology [PTDC/SEN-ENR/121265/2010, SFRH/BPD/63226/2009]
- Fundação para a Ciência e a Tecnologia [PTDC/SEN-ENR/121265/2010, SFRH/BPD/63226/2009] Funding Source: FCT
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In the new Hydrogen Economy concept, water electrolysis is considered one of the most promising technologies for hydrogen production. Novel electrocatalytic materials for the hydrogen electrode are being actively investigated to improve the energy efficiency of current electrolysers. Platinum (Pt) alloys are known to possess good catalytic activities towards the hydrogen evolution reaction (HER). However, virtually nothing is known about the effects of rare earth (RE) elements on the electrocatalytic behaviour of Pt towards the HER. In this study, the hydrogen discharge is evaluated in three different Pt RE intermetallic alloy electrodes, namely Pt-Ce, Pt-Sm and Pt Ho, all having equiatomic composition. The electrodes are tested in 8 M KOH aqueous electrolytes at temperatures ranging from 25 degrees C to 85 degrees C. Measurements of the HER by linear scan voltammetry allow the determination of several kinetic parameters, namely the Tafel coefficients, charge-transfer coefficients, and exchange current densities. Activation energies of 46, 59, 39, and 60 kJ mol(-1) are calculated for Pt, Pt-Ce, Pt-Sm and Pt-Ho electrodes, respectively. Results show that the addition of REs improves the activity of the Pt electrocatalyst. Studies are in progress to correlate the microstructure of the studied alloys with their performance towards the HER. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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