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OER Activity of Ir-Ta-Zr Composite Anode as a Counter Electrode for Electrohydrogenation of Toluene

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Abstract

The organic chemical hydride method using the toluene (TL)/methylcyclohexane (MCH) system is one of the prospective energy carrier technologies for hydrogen storage and transportation. The direct electrohydrogenation of toluene with water decomposition using electric power is a highly efficient energy conversion process for the MCH synthesis. In this process, an IrO2-based directionally stable electrode® (DSE®) for the oxygen evolution reaction (OER) is used as the anode because of its good electrocatalytic activity and durability. However, further improvement in the activity is needed for practical applications. In this study, the effect of Zr addition substituted for Ta in IrO2-Ta2O5/Ti, which is a typical OER anode, on the electrocatalytic activity has been investigated in sulfuric acid with TL contamination. The activity of both the IrO2-Ta2O5/Ti and the IrO2-Ta2O5-ZrO2/Ti was higher and less affected by TL contamination than the IrO2/Ti. The activity of the IrO2-Ta2O5-ZrO2/Ti increased with the Zr content. The Zr addition increased the real surface area along with the increase in the double layer capacitance; on the other hand, the increase in activity was more than that of the surface area. Therefore, the Zr additive would affect not only the real surface area increase, but also the electrocatalytic activity.

Schematic drawing of electrolyzer for direct electrohydrogenation of toluene with water decomposition (left). Oxygen evolution reaction current on Ir50Ta20Zr30-oxide/Ti, Ir50Ta50-oxide/Ti, and IrO2/Ti with (dash) and without (solid) toluene contamination as a function of the potential in 1 M H2SO4 at 60 oC (right).

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Acknowledgments

This study was supported by the Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), “energy carrier” (Funding agency: JST). The Institute of Advanced Sciences (IAS) in YNU is supported by the MEXT Program for Promoting the Reform of National Universities. We appreciate all persons involved in this study.

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Authors and Affiliations

  1. Green Hydrogen Research Center, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan

    Kohei Nagai, Kensaku Nagasawa & Shigenori Mitsushima

  2. Institute of Advanced Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan

    Shigenori Mitsushima

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  1. Kohei Nagai
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  2. Kensaku Nagasawa
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  3. Shigenori Mitsushima
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Correspondence to Shigenori Mitsushima.

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Nagai, K., Nagasawa, K. & Mitsushima, S. OER Activity of Ir-Ta-Zr Composite Anode as a Counter Electrode for Electrohydrogenation of Toluene. Electrocatalysis 7, 441–444 (2016). https://doi.org/10.1007/s12678-016-0325-y

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