Binder- free iridium based electrocatalysts: Facile preparation, high activity and outstanding stability for hydrogen evolution reaction in acidic medium

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2020-07-01

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Akbayrak, Merve
Önal, Ahmet Muhtar

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Herein, we develop various iridium based catalysts using titania, zirconia and ceria as asupporting material(Ir/MO2; M=Ce, Ti, Zr) for hydrogen evolution reaction (HER). To investigate their electrocatalytic activities, glassy carbon electrodes (GCE) were modified by drop casting the catalyst ink without using any binder. Linear sweep voltammetry (LSV) was used to test their electrocatalytic activities in 0.5M H2SO4solution. Among these catalysts, Ir/CeO2was found to exhibit excellent activity and superior stability. According to the polarization curves, onset potential (η0) and overpotential (η@10mA.cm−2) of Ir/CeO2were found as −13 and −23mV, respectively, which are lower than the values obtained for commercial 10% Pt/C catalyst. Moreover, Ir/CeO2provides low Tafel slope (38.7mV.dec-1), high turnover frequency (1.95 @100mV) and high exchange current density (2.69mA.cm−2) values. In addition, Ir/CeO2shows superior stability even after 20 000 cycle in acidic environment (pH=0.3) which makes Ir/CeO2(2.44wt% Ir) as a promising alternative electrocatalyst for HER.

Subject Keywords

Colloid and Surface Chemistry, Electronic, Optical and Magnetic Materials, Surfaces, Coatings and Films, Biomaterials

URI

https://hdl.handle.net/11511/57669

Journal

Journal Of Colloid And Interface Science

DOI

https://doi.org/10.1016/j.jcis.2020.06.117

Collections

Department of Chemistry, Article

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Citation Formats

M. Akbayrak and A. M. Önal, “Binder- free iridium based electrocatalysts: Facile preparation, high activity and outstanding stability for hydrogen evolution reaction in acidic medium,” Journal Of Colloid And Interface Science, pp. 11–20, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57669.