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Anisotropic etching of platinum electrodes at the onset of cathodic corrosion

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  • Thomas J. P. Hersbach

    (Leiden Institute of Chemistry, Leiden University)

  • Alexei I. Yanson

    (Cosine Measurement Systems)

  • Marc T. M. Koper

    (Leiden Institute of Chemistry, Leiden University)

Abstract

Cathodic corrosion is a process that etches metal electrodes under cathodic polarization. This process is presumed to occur through anionic metallic reaction intermediates, but the exact nature of these intermediates and the onset potential of their formation is unknown. Here we determine the onset potential of cathodic corrosion on platinum electrodes. Electrodes are characterized electrochemically before and after cathodic polarization in 10 M sodium hydroxide, revealing that changes in the electrode surface start at an electrode potential of −1.3 V versus the normal hydrogen electrode. The value of this onset potential rules out previous hypotheses regarding the nature of cathodic corrosion. Scanning electron microscopy shows the formation of well-defined etch pits with a specific orientation, which match the voltammetric data and indicate a remarkable anisotropy in the cathodic etching process, favouring the creation of (100) sites. Such anisotropy is hypothesized to be due to surface charge-induced adsorption of electrolyte cations.

Suggested Citation

  • Thomas J. P. Hersbach & Alexei I. Yanson & Marc T. M. Koper, 2016. "Anisotropic etching of platinum electrodes at the onset of cathodic corrosion," Nature Communications, Nature, vol. 7(1), pages 1-7, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12653
    DOI: 10.1038/ncomms12653
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    Cited by:

    1. Hugo-Pieter Iglesias van Montfort & Mengran Li & Erdem Irtem & Maryam Abdinejad & Yuming Wu & Santosh K. Pal & Mark Sassenburg & Davide Ripepi & Siddhartha Subramanian & Jasper Biemolt & Thomas E. Ruf, 2023. "Non-invasive current collectors for improved current-density distribution during CO2 electrolysis on super-hydrophobic electrodes," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    2. Shikai Liu & Yuheng Li & Di Wang & Shibo Xi & Haoming Xu & Yulin Wang & Xinzhe Li & Wenjie Zang & Weidong Liu & Mengyao Su & Katherine Yan & Adam C. Nielander & Andrew B. Wong & Jiong Lu & Thomas F. J, 2024. "Alkali cation-induced cathodic corrosion in Cu electrocatalysts," Nature Communications, Nature, vol. 15(1), pages 1-14, December.
    3. Daniel Escalera-López & Christian Iffelsberger & Matej Zlatar & Katarina Novčić & Nik Maselj & Chuyen Pham & Primož Jovanovič & Nejc Hodnik & Simon Thiele & Martin Pumera & Serhiy Cherevko, 2024. "Allotrope-dependent activity-stability relationships of molybdenum sulfide hydrogen evolution electrocatalysts," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    4. Robert L. Sacci & Stephanie Velardo & Lu Xiong & Daniel A. Lutterman & Joel Rosenthal, 2019. "Copper-Tin Alloys for the Electrocatalytic Reduction of CO 2 in an Imidazolium-Based Non-Aqueous Electrolyte," Energies, MDPI, vol. 12(16), pages 1-12, August.

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