Advanced iridium catalysts on multi-porous tantalum oxide supports for efficient proton exchange membrane water electrolysis
- Type
- Article
- Citation
- International Journal of Hydrogen Energy, v.97, pp.57 - 65
- Issued Date
- 2025-01
- Abstract
- Reducing the loading of precious metals such as Ir and Pt while maintaining the performance of membrane electrode assembly (MEA) with highly active oxygen evolution reaction (OER) catalysts is a significant challenge in the development of efficient proton exchange membrane water electrolyzers (PEMWEs). This study presents a highly active and cost-effective catalyst consisting of iridium supported on multi-porous tantalum oxide (M−Ta₂O₅), which integrates both macropores and mesopores. The iridium nanostructures supported on the M−Ta2O5 enhance the utilization of Ir and exhibit larger electrochemical surface areas. With a 30 wt% Ir loading, the Ir/M−Ta₂O₅ catalyst demonstrates an overpotential of 290.4 ± 3.5 mV at a current density of 10 mA cm⁻2 and a mass activity of 730.5 ± 44.6 A gIr⁻1 at 1.55 VRHE. Consequently, Ir/M−Ta2O5 can be effectively utilized to fabricate MEA with an Ir loading of 0.2 mg cm−2 and Nafion® 115 membrane. At the single-cell level, this catalyst achieves a current density of 2.5 A cm⁻2 at 1.89 V, underscoring the potential of Ir/M−Ta2O5 as a highly efficient and cost-affordable OER catalyst. This work highlights the promise of Ir/M−Ta₂O₅ in reducing the reliance on precious metals, thereby contributing to the economic and environmental sustainability of PEMWEs. © 2024 Hydrogen Energy Publications LLC
- Publisher
- Elsevier Ltd
- ISSN
- 0360-3199
- Appears in Collections:
- Department of Chemistry > 1. Journal Articles
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