Assembling Ni-Fe Layered Double Hydroxide 2D thin films for oxygen evolution electrodes

Massimo Rosa, Victor Costa Bassetto, Hubert H. Girault, Andreas Lesch, Vincenzo Esposito*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Continuous hydrothermal flow synthesis (CHFS) of Ni-Fe Layered Double Hydroxide (LDH) leads to waterborne dispersions of 2D nanoplatelets in the range of 10-50 nm in lateral size. Conversion of the as-synthesized LDH nanoplatelet dispersion into inkjet printing inks results in high precision patterning and complete substrate coverage with low LDH loadings in the range of µg·cm−2. The Ni-Fe LDHs’ anisotropy induces a preferential in-plane alignment to a glassy carbon substrate producing low porosity films. Thin Ni-Fe LDH films in the submicrometer range exhibit superior electrocatalytic activity for the oxygen evolution reaction (OER), with an overpotential of 270 mV at 10 mA·cm−2 and a Tafel slope of 32 mV·dec−1. The particle alignment induces a loading-independent electrochemical performance of the Ni-Fe LDH electrodes. The combination of CHFS and inkjet printing represents a promising hyphenation of large-scale synthesis and electrode production.
Original languageEnglish
JournalApplied Energy Materials
Volume3
Issue number1
Pages (from-to)1017-1026
ISSN2574-0962
DOIs
Publication statusPublished - 2020

Keywords

  • 2D materials
  • Nanostructures
  • Layered double hydroxide
  • Oxygen evolution reaction
  • Continuous hydrothermal syntesis
  • Inkjet printing

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