Electrocatalytic oxygen evolution and photoswitching functions of tungsten-titanium binary oxide nanostructures

G. Mohan Kumar, P. Ilanchezhiyan, C. Siva, A. Madhankumar, T. W. Kang, D. Y. Kim

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Tungsten-titania (WO3-TiO2) based binary oxide was fabricated by an eco-friendly chemical route for electrocatalytic water splitting and photoelectrical applications. Ambiguous evidence for the coexistence of W/Ti oxides and their binary feature were extensively studied by different analytical tools and also affirmed using high-resolution microscopy. The existence of multiple defects in the binary material and their 2.68 eV optical band gap was evaluated using the room-temperature photoluminescence data and Tauc's plot, respectively. Nature of conductivity in WO3-TiO2 and its flat band potential was inferred using Mott–Schottky type electrochemical impedance spectroscopic results. The enhanced photosensitivity in WO3-TiO2 was demonstrated using a flip-chip Schottky diode architecture and reasoned to the improved charge transfer kinetics across the same. Next, the potential of WO3-TiO2 for stable water splitting functions was examined. Here, WO3-TiO2 interface was found to provide an enriched surface area for effective charge transfer, complementing towards the effective oxygen evolution reaction (OER) performance. The results demonstrated a smaller overpotential of 270 mV, authenticating the oxide system as an effective anode material for water splitting reactions with excellent stability.

Original languageEnglish
Article number143652
JournalApplied Surface Science
Volume496
DOIs
StatePublished - 1 Dec 2019

Keywords

  • Optoelectronics
  • Oxides
  • Oxygen evolution reaction
  • Semiconductors

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