In this paper, we studied platinum (Pt)-and cobalt oxide (CoO x )-loaded silver tantalate (AgTaO 3 ) for photocatalytic overall water splitting. Pt and CoO x were loaded on AgTaO 3 by photodeposition, and the obtained photocatalysts were characterized by using powder X-ray diffraction (XRD), UV-visible (UV-vis) absorption spectroscopy, X-ray photoelectron spectroscopy (XPS), inductively coupled plasma atomic emission spectroscopy (ICP-AES), and microscope inspection. By the scanning transmission electron microscope (STEM) inspection, the diameters of Pt and CoO x particles were found to be approximately 30 and 50 nm, respectively. When AgTaO 3 photocatalyst loaded with Pt and CoO x nanoparticles was employed for water splitting, the activity was demonstrated to be 80 times higher compared with the bare AgTaO 3 , indicating that the photodeposited Pt and CoO x effectively functioned as the hydrogen (H 2 ) and oxygen (O 2 ) evolution cocatalysts, respectively. While the use of photodeposited CoO x is often limited in photoelectrochemical water oxidation and photocatalytic half-reaction of water, CoO x deposited on AgTaO 3 could be demonstrated to enhance the photocatalytic overall water splitting activity.
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