Construction of MnFe layer double hydroxide on biomass-derived carbon heterostructure for efficient electrocatalytic water splitting

Athibala Mariappan, Ranjith Kumar Dharman, Tae Hwan Oh, Samikannu Prabu, Kung Yuh Chiang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

In recent years, designing effective and stable non-metal electrocatalysts for water-splitting has received considerable attention. In this study, a bio-derived carbon/MnFe-layered double hydroxide (LDH) (MnFe–C) catalyst was synthesized by pyrolysis process followed by a hydrothermal method. The MnFe–C electrocatalyst showed outstanding hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activities in 1 M KOH, with overpotentials of 120 and 280 mV at 10 mA cm−2 and smaller Tafel values of 86 and 92 mV dec−1, respectively. Furthermore, the MnFe–C electrocatalyst exhibited robust stability (50 h) for both the HER and OER in an alkaline medium. This remarkable water-splitting performance is ascribed owing to the synergistic effects of the heterostructure formation of MnFe-LDH and the bio-carbon. In addition, the electrocatalyst exhibited better electrical conductivity, faster electron transfer, and more surface-active sites, which collectively enhanced the overall electrocatalytic performance. Therefore, this study offers a dynamic approach to the development of efficient multifunctional electrocatalysts for alkaline water electrolyzers.

Original languageEnglish
Article number128321
JournalMaterials Chemistry and Physics
Volume309
DOIs
StatePublished - 1 Nov 2023

Keywords

  • Bio-derived carbon
  • Electrocatalysts
  • Hydrogen evolution reaction
  • MnFe-LDH
  • Oxygen evolution reaction

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