Morphology engineered spatial charge separation in superhydrophilic TiO2/graphene hybrids for hydrogen production

N. T. Padmanabhan, P. Ganguly, S. C. Pillai, H. John*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Spatial charge separation is achieved by morphologically tuning TiO2 nanomaterials along with graphene by a hydrothermally modified sol-gel synthetic route. Morphology engineered TiO2 is constructed between nanocuboids with high energy {010}/{100} and {001}facets, and nanoellipsoids exposing low energy {101} facets. In situ grown titania hybridized with graphene (0.1% w/w) introduced chemical linkages as affirmed by XPS, Raman and FTIR studies. PL and TCSPC measurements greatly supported interfacial charge separation and reduced recombination rate in the hybrids. Photocatalytic studies determined that hybrids with TiO2 nanoellipsoids favoured hydrogen production as high as 18,266.6 μL/gm/L/hr under solar light illumination. While the hybrid with shared morphology of nanoellipsoids and nanocuboids for TiO2 exhibited comparatively less H2 production (13,967 μL/gm/L/hr) but displayed extreme photoinduced wettability of ~0° within 10 min of light irradiation. The divergence in the performance of morphologically tuned hybrids is explained using a plausible mechanism, assisted by photoconductivity and Hall-Effect measurements.

Original languageEnglish
Article number100447
JournalMaterials Today Energy
Volume17
DOIs
Publication statusPublished - Sep 2020
Externally publishedYes

Keywords

  • Hall effect
  • Photoconductivity
  • Self-cleaning
  • TiO/Graphene interface
  • TiOfacets
  • Wettability

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science (miscellaneous)
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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