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Kinetics of Toluene Electrohydrogenation on Pt/C Catalyst

Authors
  • Bao, Yun1
  • Napporn, Teko W.2, 3
  • Nagasawa, Kensaku3
  • Mitsushima, Shigenori1, 3
  • 1 Yokohama National University, Green Hydrogen Research Center, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan , Yokohama (Japan)
  • 2 Université de Poitiers, Institut de Chimie des Milieux et des Matériaux de Poitiers, UMR 7285 CNRS, 4, rue Michel Brunet B27 - TSA, Poitiers Cedex 9, 51106 86073, France , Poitiers Cedex 9 (France)
  • 3 Yokohama National University, Institute of Advanced Sciences, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan , Yokohama (Japan)
Type
Published Article
Journal
Electrocatalysis
Publisher
Springer US
Publication Date
Feb 06, 2019
Volume
10
Issue
2
Pages
184–194
Identifiers
DOI: 10.1007/s12678-019-0507-5
Source
Springer Nature
Keywords
License
Yellow

Abstract

The kinetics of the toluene (TL) electrohydrogenation on a carbon-supported platinum catalyst (Pt/C) have been investigated as a fundamental study of the cathode reaction in an electrolyzer with water decomposition. Since the TL electrohydrogenation on a Pt wire and Pt/C catalyst is a fast kinetic reaction with a low solubility, and slow mass transfer in an aqueous electrolyte, a potential step sequence was employed to determine its kinetic performance. Based on this method, a non-faradic current and faradic current could be identified and thereafter separated by a capacitance simulation. This experiment was performed in a TL-saturated sulfuric acid electrolyte to minimize the effect of the TL mass transfer. Based on the mass transfer–free TL electrohydrogenation experimental results, the exchange current densities of the TL electrohydrogenation on the Pt/C were 0.48, 0.49, 0.72, and 0.8 mA cm−2 at 25, 40, 50, and 60 °C, respectively. We found that the carbon support has a high impact towards the TL electrohydrogenation on the Pt-supported material. The carbon material works as a sponge by absorbing TL from the solution, and providing a large TL coverage for the Pt surface. Finally, a Tafel plot of the TL electrohydrogenation on the Pt/C catalyst was obtained and the kinetic performance was determined. The apparent active energy of the TL electrohydrogenation on the Pt/C was then calculated as 13.1 kJ mol−1. Graphical Abstract

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