(23e) IrO2 Nanopore MEA for Highly Efficient Oxygen Evolution Electrocatalyst in SPE
AIChE Annual Meeting
2016
2016 AIChE Annual Meeting
Transport and Energy Processes
Catalysts for Fuel Cells, Electrolyzers, and Electrochemical Devices
Sunday, November 13, 2016 - 5:00pm to 5:15pm
IrO2 is a great candidate of anode electrode for its high OER activity and good stability. However, the high price of Ir hinders its extensive application1. In this work, IrO2 nanopore structure was synthesized with anodized TiO2 (ATO) template. Most of reported works used ATO template prepared in organic solution, which had tiny or no gaps between the tubes and resulted in nanowire or nanotube structure of catalyst2-4, High aspect ratio nanowire or nanotube may tend to crack during solid polymer electrolyzer (SPE) assembling. In contrast, ATO template synthesized in HF-H3PO4 aqueous solution showed well-separated tubes5 and IrO2 could be electrodeposited on the external tube wall to form nanopore structure with large surface area, high oxygen evolution reaction (OER) activity and good mechanical property. The pore diameter was controlled by applying different voltage. Cyclic voltammetry and galvanostatic method was used to deposit IrO2 on the template. A membrane electrode assemble (MEA) for SPE was fabricated by hot-press method with IrO2 nanopore catalyst and Nafion membrane follow by acid treatment to remove the template.
Reference:
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2.Shan, R.; Zhang, Z.; Kan, M.; Zhang, T.; Zan, Q.; Zhao, Y. International Journal of Hydrogen Energy 2015, 40, (41), 14279-14283.
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