Enhanced electron transport by Fe2O3 on NCQDs–MgO nanostructure for solar photocatalysis and electrocatalytic water splitting

Ghulam Sughra Jamila, Shamaila Sajjad*, Sajjad Ahmed Khan Leghari, Maria Mehboob, Cristina Flox

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

In this research work, MgO-based solar efficient Fe2O3/NCQDs–MgO ternary photocatalyst was synthesized through a facile approach. The XRD results confirmed the presence of characteristic peaks of Fe2O3 and MgO nanomaterials. The NCQDs resulted in broadening of peaks which, thus, resulted in decreasing particle size. SEM showed a honeycomb-like structure for Fe2O3/NCQDs–MgO ternary nanocomposites. The HRTEM findings agreed well with XRD and SEM. The UV–Vis spectroscopy depicted a remarkable reduction of the band gap of MgO 5.39–2.44 eV in ternary composites enabling energies asserting enhanced photo response of MgO in the visible region. The vastly reduced PL intensity confirmed the minimized charge carrier recombination in Fe2O3/NCQDs–MgO ternary nanocomposites and enhance electronic transitions due to NCQDs. The fabricated ternary photocatalyst was applied for the sunlight-driven photocatalytic removal of Rhodamine B and for electrocatalytic water splitting. The composites with 2.0% Fe2O3 exhibited the highest degradation efficiency and improved activity towards HER and OER. The ternary composite showed a current density of 93 µA/cm2 for HER and a current density of 238µA/cm2 towards OER. The increased current density is evident through continuous cycles indicating good stability of the synthesized ternary catalyst. The developed nanocomposites are found fairly stable both for environmental detoxification and electrocatalytic water splitting.

Original languageEnglish
Number of pages13
JournalApplied Nanoscience (Switzerland)
Early online date14 Mar 2022
DOIs
Publication statusE-pub ahead of print - 14 Mar 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Electronic transitions
  • FeONCQDs/MgO ternary composite
  • HER
  • Nitrogen-doped CQDs
  • OER

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