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 language | English |
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Article number | 143652 |
Journal | Applied Surface Science |
Volume | 496 |
DOIs | |
State | Published - 1 Dec 2019 |
Keywords
- Optoelectronics
- Oxides
- Oxygen evolution reaction
- Semiconductors