Electronic Structure and Room Temperature Ferromagnetism in Gd-doped Cerium Oxide Nanoparticles for Hydrogen Generation via Photocatalytic Water Splitting.

Autor: Soni S; Department of Pure and Applied Physics University of Kota Kota 324005 Rajasthan India., Chouhan N; Department of Pure and Applied Chemistry University of Kota Kota 324005 Rajasthan India., Meena RK; Department of Pure and Applied Chemistry University of Kota Kota 324005 Rajasthan India., Kumar S; Department of Physics Mohan Lal Sukhadia University Udaipur Rajasthan India., Dalela B; Department of Physics Govt. Khetan Polytechnic College Jhalana Dungri Jaipur Rajasthan India., Mishra M; CSIR-National Physical Laboratory Dr. K. S. Krishnan Road New Delhi 110012 India., Meena RS; Electronic Materials and Nanomagnetism Lab Department of Applied Physics Amity School of Applied Sciences Amity University Haryana Gurgaon 122413 Haryana India., Gupta G; CSIR-National Physical Laboratory Dr. K. S. Krishnan Road New Delhi 110012 India., Kumar S; Electronic Materials and Nanomagnetism Lab Department of Applied Physics Amity School of Applied Sciences Amity University Haryana Gurgaon 122413 Haryana India., Alvi PA; Department of Physics Banasthali University Newai 304022 Rajasthan India., Dalela S; Department of Pure and Applied Physics University of Kota Kota 324005 Rajasthan India.
Jazyk: angličtina
Zdroj: Global challenges (Hoboken, NJ) [Glob Chall] 2019 Jan 07; Vol. 3 (5), pp. 1800090. Date of Electronic Publication: 2019 Jan 07 (Print Publication: 2019).
DOI: 10.1002/gch2.201800090
Abstrakt: Enhanced visible light photocatalytic activity of Gd-doped CeO 2 nanoparticles (NPs) is experimentally demonstrated, whereas there are very few reports on this mechanism with rare earth doping. All-pure and Gd-doped CeO 2 NPs 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 CeO 2 is discussed along with defects and oxygen vacancies generation. The XRD confirms the incorporation of Gd 3+ at the Ce 3+ /Ce 4+ 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 Ce 4+ changes to Ce 3+ . 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.
Competing Interests: The authors declare no conflict of interest.
Databáze: MEDLINE
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