Visible–Near-Infrared-Light-Driven Oxygen Evolution Reaction with Noble-Metal-Free WO₂–WO₃ Hybrid Nanorods

Abstract

Understanding and manipulating the one half-reaction of photoinduced hole-oxidation to oxygen are of fundamental importance to design and develop an efficient water-splitting process. To date, extensive studies on oxygen evolution from water splitting have focused on visible-light harvesting. However, capturing low-energy photons for oxygen evolution, such as near-infrared (NIR) light, is challenging and not well-understood. This report presents new insights into photocatalytic water oxidation using visible and NIR light. WO-WO hybrid nanorods were in situ fabricated using a wet-chemistry route. The presence of metallic WO strengthens light absorption and promotes the charge-carrier separation of WO. The efficiency of the oxygen evolution reaction over noble-metal-free WO-WO hybrids was found to be significantly promoted. More importantly, NIR light (≥700 nm) can be effectively trapped to cause the photocatalytic water oxidation reaction. The oxygen evolution rates are even up to around 220 (λ = 700 nm) and 200 (λ = 800 nm) mmol g h. These results demonstrate that the WO-WO material is highly active for water oxidation with low-energy photons and opens new opportunities for multichannel solar energy conversion.

Self‐Hybrid Transition Metal Oxide Nanosheets Synthesized by a Facile Programmable and Scalable Carbonate‐Template Method

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In Situ Surface Decoration of a Titanium Nanosubstrate by a TiO2–WO3 Composite

“…FT-IR analysis was performed to identify the structure and bonding nature in the synthesized photocatalysts . The vibrational bands reiterated the presence of anatase TiO 2 and orthorhombic and monoclinic WO 3 in the composite. , Figure S1 revealed the vibrational characteristics of the fabricated composites.…”

Perovskite Sr1−x Ba x W1−y Ta y (O,N)3: synthesis by thermal ammonolysis and photocatalytic oxygen evolution under visible light

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