1. (0 2 0)-Textured tungsten trioxide nanostructure with enhanced photoelectrochemical activity
- Author
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In Sun Cho, Woosung Park, Uk Sim, Subramani Surendran, Sung Won Hwang, Yelyn Sim, Hyun Soo Han, and Hyunkyu Kim
- Subjects
Photocurrent ,Laser ablation ,Nanostructure ,010405 organic chemistry ,Chemistry ,010402 general chemistry ,01 natural sciences ,Tungsten trioxide ,Catalysis ,0104 chemical sciences ,chemistry.chemical_compound ,X-ray photoelectron spectroscopy ,Chemical engineering ,Deposition (phase transition) ,Reversible hydrogen electrode ,Texture (crystalline) ,Physical and Theoretical Chemistry - Abstract
Texturing, i.e., preferentially oriented deposition of a film with a specific crystallographic direction, enables the manipulation of the charge transport properties and surface reactivity of photoelectrodes for solar water-splitting. The advancement of solar water-splitting systems under neutral conditions is a vital strategy to reduce the economic and ecological traits of the prevailing strong acid or alkaline-based solar water-splitting systems. However, the photoelectrodes have to endure cumulative barriers in neutral media to convalesce the performance of the neutral solar water-splitting system. The implication of texturing in materials enforces the synergistic effect that is essential to confine the barriers to improve the performance of the photoelectrodes in eco-friendly neutral pH conditions. Here, we synthesized tungsten trioxide (WO3) films to achieve a columnar-type nanostructure with (0 2 0) texture, through a laser ablation deposition. Specifically, we modulated both deposition temperature and working pressure, enabling the (0 2 0) textured deposition of films, as well as the fine-tuning of the surface morphology. With optimized fabrication conditions, the (0 2 0)-textured WO3 film (thickness: 3.6 µm) showed improved photoelectrochemical water-oxidation performance, and the photocurrent density was ~3 mA/cm2 at 1.23 V versus reversible hydrogen electrode in an economic and ecological neutral condition. The WO3 films were further characterized using various methods, namely a UV–Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), and Hall Effect measurements. Based on the measured film characteristics, we attributed enhanced charge transport and transfer characteristics to the (0 2 0)-texturing, and the formation of the optimal amount of oxygen vacancies.
- Published
- 2020
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