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IrRe-IrOx electrocatalysts derived from electrochemically oxidized IrRe thin films for efficient acidic oxygen evolution reaction
- Source :
- Electrochimica Acta. 398:139248
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Slow kinetics of oxygen evolution reaction (OER), combined with harsh conditions of acidic media, significantly limits the progress of large-scale hydrogen production by water splitting. Efficient, stable and less-expensive catalysts are required to overcome such restrictions. Herein, we report preparation of IrRe-IrOx based catalysts with record high mass activity. The electrocatalyst was prepared by magnetron sputtering deposition of metallic Ir-Re thin film with subsequent electrooxidation. The optimal composition of as-deposited Ir-Re catalyst was defined as Ir39Re61. During electrooxidation process Re atoms are dissolved promoting metallic Ir oxidation to highly active amorphous IrOx phase with high surface area. The IrRe-IrOx catalyst exhibits low OER overpotential of 248 mV at 10 mA•cm-2 current density and mass activity of 4400 mA•mg−1. High mass OER activity of the IrRe-IrOx catalyst is result of combination of high surface area, low catalyst loading and presence of amorphous IrOx on catalyst surface.
Details
- ISSN :
- 00134686
- Volume :
- 398
- Database :
- OpenAIRE
- Journal :
- Electrochimica Acta
- Accession number :
- edsair.doi...........fc404ebbab8d5f0b3a5d63feb18730a6