Platinum is an ideal catalyst for various chemical reactions. For example, proton-exchange membrane fuel cells contain Pt-based nanoparticles due to the sluggish kinetics of oxygen reduction reaction (ORR). However, Pt resource is scarce, and produced in limited areas. Therefore, recycling plays a key role for resource security as well as enhancement of the ORR activity. In hydrometallurgical Pt recovery process, Pt in spent materials is dissolved into acidic solution followed by forming Pt-ammonium compound to be separated from other metal species. Then, pure Pt is recovered via heat treatment. When recovered Pt is used for synthesis of renewed material, pure Pt is redissolved to prepare general Pt precursor. The current recycling process is complicated, and is not always worth the cost. Moreover, reactive and toxic aqua regia, which releases nitrosyl chloride, nitrogen dioxide, and chlorine, is used to leach stable Pt. Herein, we propose a closed Pt cycle system by connecting recycling process with material synthesis. The system is composed of two research topics: (1) synthesis of active Pt-based electrocatalyst directly from Pt-ammonium compound, which is generated as recycling intermediate, (2) and development of green recycling process without harmful aqua regia. In future, spent material will be starting material.

Platinum recycling for synthesis of Pt-based electrocatalysts

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.