High-Entropy Synthesis of (Cr0.7Co0.2Rh0.1)VO4Nanospheres with Improved Visible-Light Photoresponse

Abstract

Vanadates, a class of vanadium-based materials, are widely recognized for their versatile structural and electrochemical properties. However, traditional synthesis methods often result in facet-dependent structures, limiting light absorption and reducing photoelectric performance. In this study, we synthesized stable spherical (Cr<inf>0.7</inf>Co<inf>0.2</inf>Rh<inf>0.1</inf>)VO<inf>4</inf>nanospheres via a high-entropy approach, achieving uniform mixing and nanoscale phase stabilization. This novel morphology significantly reduces light scattering and enhances absorption through total internal reflection. The resulting material exhibited a phototo-dark current ratio of 1.53, response times as low as 202 ms (rise) and 203 ms (decay), and consistent photoresponsivity across the visible spectrum. These findings highlight the potential of (Cr<inf>0.7</inf>Co<inf>0.2</inf>Rh<inf>0.1</inf>)VO<inf>4</inf>nanospheres as a promising candidate for advanced photoelectric applications, including photodetectors, visible-light-driven devices, and visible-light-responsive devices. © 2025 Elsevier B.V., All rights reserved.