Harvesting, storing and utilising solar energy using MoO3 : modulating structural distortion through pH adjustment

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Shi Nee Lou
  • Yun Hau Ng
  • Charlene Ng
  • Jason Scott
  • Rose Amal

Detail(s)

Original languageEnglish
Pages (from-to)1934-1941
Journal / PublicationChemSusChem
Volume7
Issue number7
Online published8 May 2014
Publication statusPublished - Jul 2014
Externally publishedYes

Abstract

Nanostructured molybdenum oxide (α-MoO3) thin film photoelectrodes were synthesised by anodisation. Upon band gap-excitation by light illumination, α-MoO3 is able to store a portion of the excited charges in its layered structure with the simultaneous intercalation of alkali cations. The stored electrons can be discharged from α-MoO3 for utilisation under dark conditions, and α-MoO3 is able to recharge itself with successive illuminations to behave as a 'self-photo-rechargeable' alkali-ion battery. The alteration of the anodisation pH allowed the crystal structure and oxygen vacancy concentrations of α-MoO3 to be modulated to achieve (i) a distorted MoO6 octahedra for enhanced charge separation and storage, (ii) a layered structure with a greater exposed (010) crystal face for rich and reversible ion intercalation and (iii) a highly crystalline thin film that suppresses electron-hole pair recombination. Overall, the larger MoO6 octahedral distortion in α-MoO3 at a higher pH favours charge storage, whereas smaller octahedral distortion at a lower pH leads to anodic photocurrent enhancement. 

Research Area(s)

  • electrochemistry, energy conversion, intercalations, molybdenum, thin films

Citation Format(s)

Harvesting, storing and utilising solar energy using MoO3 : modulating structural distortion through pH adjustment. / Lou, Shi Nee; Ng, Yun Hau; Ng, Charlene; Scott, Jason; Amal, Rose.

In: ChemSusChem, Vol. 7, No. 7, 07.2014, p. 1934-1941.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review