کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7707444 | 1497316 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The electrocatalysis of oxygen evolution reaction on La1âxCaxFeO3âδ perovskites in alkaline solution
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The electrocatalytic oxygen evolution reaction (OER) on iron based perovskites with composition La1âxCaxFeO3âδ (0.0 â¤Â x â¤Â 1.0) in alkaline solution has been investigated. The perovskite samples were synthesized by combustion method. Energy dispersive spectroscopy and X-ray photoelectron spectroscopy were used to determine the bulk and the surface composition, respectively. The X-ray diffraction and iodometric titration method were employed to examine the phases and the oxidation state, respectively. It was observed that incorporation of calcium (Ca2+) ions in the lattice of LaFeO3 decreases the lattice parameters and the cell volume systematically as evaluated by Rietveld method. Furthermore, increase in the degree of Ca2+ substitution from 0.0 to 1.0, increases the average oxidation state of iron from Fe3+ to Fe4+ in addition to creating oxygen vacancies. The evaluation of OER kinetics on a rotating disk electrode setup suggests that incorporation of Ca2+ decreases the activity initially (0.0 â¤Â x â¤Â 0.4), but further substitution increases the activity. The maximum activity was observed for x = 1.0. This change in the OER activity suggests an interplay between the bond lengths and angles, oxygen vacancy and the average oxidation state of Fe.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 43, Issue 9, 1 March 2018, Pages 4682-4690
Journal: International Journal of Hydrogen Energy - Volume 43, Issue 9, 1 March 2018, Pages 4682-4690
نویسندگان
Ravi Sankannavar, A. Sarkar,