Highly Active and Durable PtIr Nanoparticles Toward Oxygen Reduction and Oxygen Evolution Reaction

Abstract

Design and synthesis of highly active and durable bifunctional electrocatalysts is crucial toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in unitized regenerative proton exchange membrane fuel cells (UR-PEMFCs). Herein, we report a simple phase-transfer reduction method to synthesize PtIr nanoparticles with different molar ratios. When the Pt/Ir molar ratio is 2.2:1, the bifunctional oxygen activity is optimal. The ORR mass activity of Pt_2.2Ir nanoparticles is 190.3 mA/mg_Pt @ 0.9 V (vs. RHE), which is 1.8 times and 3.7 times those of commercial Pt black and physically mixed commercial Pt and Ir black (Pt+Ir black), respectively. At the potential of 1.53 V vs. RHE, the OER mass activity of Pt_2.2Ir nanoparticles is 202.7 mA/mg_Ir, which is 2.0 times and 1.3 times those of Ir black and Pt+Ir black, respectively. An overpotential gap of Pt_2.2Ir nanoparticles (618 mV) between the half-wave potential of ORR and the potential at 10 mA/cm² of OER is superior to Pt+Ir black (662 mV). After durability tests, the ORR/OER activity of Pt_2.2Ir nanoparticles remained much better than Pt+Ir black. X-Ray photoelectron spectroscopy suggests that the electronic interaction between Pt and Ir accounts for enhanced bifunctional oxygen activity. Eventually, the Pt_2.2Ir nanoparticles were evaluated in UR-PEMFCs.

Keywords

Unitized regenerative proton exchange membrane fuel cell / Oxygen reduction reaction / Oxygen evolution reaction / Bifunctional oxygen electrocatalyst

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RIGHTS & PERMISSIONS

Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH