Flexible and Binder-Free Iron Phosphide Electrodes Using a Three-Dimensional Support for High Hydrogen Productivity

María Isabel Díez-García*, Andrés Alberto García Blanco, Sebastian Murcia-López, Marc Botifoll, Jordi Arbiol, Mohammad Qamar, Joan Ramon Morante

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In this work, an inexpensive and reliable microstructured electrode for the hydrogen evolution reaction (HER) is developed. This cathode is made of Earth-abundant elements consisting of iron phosphide as an electrocatalyst and carbon felt (CF) as a flexible conductive scaffold. Its porous character and binder-free FeP coverage over the carbon fibers generate a high number of accessible active sites for the reaction, achieving a high value of the electrochemically active surface area. The electrode reaches 100 mA ⋅ cm−2 by applying only −53 mV vs RHE at 50 °C in 0.5 M H2SO4, demonstrating excellent electrocatalytic activity for the HER and outstanding stability in acidic electrolyte. Furthermore, the feasibility of these electrodes for industrial application is evaluated using a PEM electrolyzer. The developed prototype with a cathodic area of 1.8 cm2 shows a very promising performance, reaching 14.9 mmol H2 ⋅ h−1 ⋅ cm−2 (corresponding to 800 mA ⋅ cm−2) at a voltage of only 2.1 V.

Original languageEnglish
Article numbere202201152
JournalChemElectroChem
Volume10
Issue number17
DOIs
StatePublished - 1 Sep 2023

Bibliographical note

Publisher Copyright:
© 2023 The Authors. ChemElectroChem published by Wiley-VCH GmbH.

Keywords

  • FeP nanoparticles
  • PEM electrolyzer
  • carbon felt
  • hydrogen evolution reaction
  • water splitting

ASJC Scopus subject areas

  • Catalysis
  • Electrochemistry

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