Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
Nowadays, we face a climate change and energy crisis, where 30–40% of the global primary energy is consumed by buildings. Windows play a crucial role in controlling the temperatures inside buildings. One of the appealing approaches to controlling window transparency is using electrochromic (EC) materials as the active layer coating the window. EC materials are usually composed of transition-metal-oxides and exhibit dynamic light transmittance modulation in a broad spectral range by applying a voltage bias, which is an easy modulation trigger.
Ultrathin nanostructures appeal to EC applications due to their high specific surface area and easy access for diffusing ions. Synthesis of ultrathin nanowires (NWs) composed of several known transition-metal-oxides with electrochromic properties may form new electrochromic materials. The presence of other metal cations in the metal-oxide crystal can provide new energy levels or change the charge defects, thus affecting the electrochromic properties. Herein, we present a novel and facile method for alloying ultrathin tungsten-oxide NWs with molybdenum. Changes in the absorption, oxidation state, and optoelectronic properties are obtained. The formation mechanism is investigated by temporal examination of the growth progress. Our results demonstrate the contribution of the material composition on the electrochromic properties while preserving the ultrathin morphology.
We thank Dr. Vladimir Ezersky for his expert assistance with HRTEM and the fruitful discussion. N.A. thanks the Darom fellowship from the Kreitman School of Advanced Graduate Studies, Ben-Gurion University, of the Negev.
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