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

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 Mn...

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Veröffentlicht in:Materials chemistry and physics 2023-11, Vol.309, p.128321, Article 128321
Hauptverfasser: Mariappan, Athibala, Dharman, Ranjith Kumar, Oh, Tae Hwan, Prabu, Samikannu, Chiang, Kung-Yuh
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Sprache:eng
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Zusammenfassung: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. •A bio-derived carbon/MnFe-LDH (MnFe–C) was successfully synthesized by pyrolysis followed by a hydrothermal method.•The obtained electrocatalyst shows outstanding HER and OER activity with robust stability for 50 h in alkaline medium.•The remarkable electrocatalytic performance attributes to the synergistic effect between MnFe-LDH and carbon.
ISSN:0254-0584
DOI:10.1016/j.matchemphys.2023.128321