Abstract
Materials with surface plasmon effect can effectively utilize solar energy by enhancing light absorption ability, which is a hot research area recently. In addition to precious metals, semiconductor plasmonic materials show great potential advantages. Herein, a plasmonic material of Au/WO3-x heterostructure was successfully prepared via an in-situ chemical reduction method. The WO3-x with ultrathin oxygen vacancies-enriched nanosheet structure was fabricated from bulk H2WO4 with assistance of supercritical fluid and hydrogenation treatment, which showed strong optical absorbance in the near infrared (NIR) region. In order to extend the light response range and improve the charge separation efficiency, the plasmonic Au nanoparticles were further combined with the as-prepared plasmonic WO3-x. The resultant Au/WO3-x plasmonic heterostructures exhibited excellent photothermal conversion efficiency of 61.8% and enhanced photocatalytic water splitting performance, which indicated it could capture solar energy and convert it into thermal and chemical energy efficiently.
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