标题：Electronic Structure and Room Temperature Ferromagnetism in Gd‐doped Cerium Oxide Nanoparticles for Hydrogen Generation via Photocatalytic Water Splitting
摘要：AbstractEnhanced visible light photocatalytic activity of Gd‐doped CeO2nanoparticles (NPs) is experimentally demonstrated, whereas there are very few reports on this mechanism with rare earth doping. All‐pure and Gd‐doped CeO2NPs are synthesized using a coprecipitation method and characterized using X‐ray diffraction (XRD), absorption spectroscopy, surface‐enhanced Raman Spectroscopy (SERS), X‐ray photoelectron spectroscopy (XPS), and superconducting quantum interference device (SQUID). The effect of Gd‐doping on properties of CeO2is discussed along with defects and oxygen vacancies generation. The XRD confirms the incorporation of Gd3+at the Ce3+/Ce4+site by keeping the crystal structure same. The average particle size from transmission electron microscopy (TEM) images is in the range of 5–7 nm. The XPS spectra of Ce 3d, O 1s, and Gd 4d exhibits the formation of oxygen vacancies to maintain the charge neutrality when Ce4+changes to Ce3+. The gradual increase in hydrogen production is observed with increasing Gd concentration. The observed results are in good correlation with the characterization results and a mechanism of water splitting is proposed on the basis of analyses. The absorption spectra reveal optical band gap (2.5–2.7 eV) of samples, showing band gap narrowing leads to desired optical absorbance and photoactivity of NPs.Visible light photocatalytic activity of Gd‐doped CeO2nanoparticlesare experimentally demonstrated, with a gradual increase in hydrogen production with Gd‐concentration. The particle size of photocatalyst, binding energies, oxygen vacancy concentrations, band gap, etc., are collectively responsible for the increase in hydrogen generation activity with increasing Gd‐doping concentration in ceria.
