Surfactant-Free Synthesis of Plasmonic Tungsten Oxide Nanowires with Visible-Light-Enhanced Hydrogen Generation from Ammonia Borane

WO3-x nanowires were successfully synthesized through a simple surfactant-free solvothermal method. These nanowires exhibit strong plasmonic absorption in the visible and near-infrared region owing to the abundant oxygen vacancies. The plasmon excitation of these WO3-x nanowires provide five times enhancement on the hydrogen generation from ammonia borane.