Lithium dopant assisted surface modification Zn ferrites for high-performance supercapacitor applications

Mahmoud, M.H.; Elshahawy, Abdelnaby M.; Taha, T.A.

doi:10.1016/j.est.2023.107881

Cited by 6 publications

(3 citation statements)

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“…As calcium replaces chromium in the lattice, the larger sizes of the Ca 2+ ions cause the surrounding lattice to expand. ) [74], the average crystal size (D) of th three main peaks (33.7, 36.2, 55.13°) was calculated to be 25 nm.…”

Section: Resultsmentioning

confidence: 99%

“…By using the Scherrer equation (

) [ 74 ], the average crystal size (D) of the three main peaks (33.7, 36.2, 55.13°) was calculated to be 25 nm.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 1. X-ray powder diffraction of Cr 2−x Ca x O 3 nanoparticles.By using the Scherrer equation (D = 0.9λ βcosθ )[74], the average crystal size (D) of the three main peaks (33.7, 36.2, 55.13 • ) was calculated to be 25 nm.The FTIR measurements in Figure2were performed for the Cr 2−x Ca x O 3 nanoparticles. The noted bands at 435, 550, 620, and 1092 cm −1 correspond to the chromium oxide (Cr 2 O 3 ).…”

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confidence: 99%

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A High-Performance Cr2O3/CaCO3 Nanocomposite Catalyst for Rapid Hydrogen Generation from NaBH4

Alshammari,

Alhassan

et al. 2024

Nanomaterials

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This study aims to prepare new nanocomposites consisting of Cr2O3/CaCO3 as a catalyst for improved hydrogen production from NaBH4 methanolysis. The new nanocomposite possesses nanoparticles with the compositional formula Cr2−xCaxO3 (x = 0, 0.3, and 0.6). These samples were prepared using the sol-gel method, which comprises gelatin fuel. The structure of the new composites was studied using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, environmental scanning electron microscopy (ESEM), and X-ray spectroscopy (XPS). The XRD data showed the rhombohedral crystallinity of the studied samples, and the average crystal size was 25 nm. The FTIR measurements represented the absorption bands of Cr2O3 and CaO. The ESEM micrographs of the Cr2O3 showed the spherical shape of the Cr2O3 nanoparticles. The XPS measurements proved the desired oxidation states of the Cr2−xCaxO3 nanoparticles. The optical band gap of Cr2O3 is 3.0 eV, and calcium doping causes a reduction to 2.5 and 1.3 eV at 15.0 and 30.0% doping ratios. The methanolysis of NaBH4 involved accelerated H2 production when using Cr2−xCaxO3 as a catalyst. Furthermore, the Cr1.7Ca0.3O3 catalyst had the highest hydrogen generation rate, with a value of 12,750 mL/g/min.

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Section: Resultsmentioning

confidence: 99%

“…By using the Scherrer equation (

) [ 74 ], the average crystal size (D) of the three main peaks (33.7, 36.2, 55.13°) was calculated to be 25 nm.…”

Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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