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عنوان فارسی مقاله:
افزایش اکسیژن خالی ناشی از اکسیداسیون آب فتوشیمیایی در کاتالیزور کلسیم اکسید منگنز
عنوان انگلیسی مقاله:
Oxygen vacancy induced enhancement of photochemical water oxidation on calcium manganese oxide catalyst
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
The photo(electro)chemical splitting water into hydrogen and oxygen has attracted tremendous attention in recent years because of its great potential in solar energy conversion and storage applications [1]. In respect to hydrogen evolution reaction, a two-electron-transfer process, oxygen evolution reaction is more complex, which involves fourelectron-transfer process. Currently, owing to the slow four-electron transfer rate and the high activation energy barrier for O\\O bond formation, the oxygen evolution is the main obstacle limiting the efficiency of overall water splitting [2]. Searching environmentally-friendly and efficient oxygen evolution catalysts (OECs) is an urgent and challenging task among the solar water splitting community. In nature, a Mn4CaO5 cluster as the oxygen evolving complex in photosystem II (PS II), has been identified as the catalytic site for the fourelectron involved water oxidation [3]. Inspired by the natural photosynthesis process in PS II, synthetic manganese-containing compounds are thought to be very promising candidates as functional water oxidation catalysts to mimic the role of Mn4CaO5 cluster in water oxidation [4]. Various nanostructured solid manganese oxides (MnOx) including MnO2, Mn2O3, Mn3O4, MnOx, MnO, Mn3(PO4)2·3H2O, CaMn2O4·xH2O and amorphous CaxMnOy have been synthesized and tested as OECs in either electrochemical or photochemical systems [5–12]. Recently, oxygen deficient CaMnO3 − δ compounds have been reported as electrocatalysts for oxygen evolution/reduction reactions [13,14]. The results suggest that the oxygen-deficient CaMnO3 − δ compounds are promising and inexpensive bifunctional catalytic materials for reversible oxygen reduction and evolution reactions. Therefore, it is highly desirable to further investigate the oxygen-deficient CaMnO3−δ as the OECs in a photochemical system for potential application in solar water splitting. In this work, we have synthesized CaMnO3 and Ca2Mn2O5 perovskite nanoparticles and evaluated their photocatalytic performance in water oxidation with α-MnO2 nanorods as a reference sample.
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کلمات کلیدی:
Photochemical Water Oxidation by Crystalline Polymorphs of ... pubs.acs.org/doi/abs/10.1021/ja310286h by DM Robinson - 2013 - Cited by 232 - Related articles Feb 7, 2013 - Manganese oxides occur naturally as minerals in at least 30 different crystal structures, providing a rigorous test system to explore the ... δ-MnO2 - Mn3O4 Nanocomposite for Photochemical Water Oxidation ... pubs.acs.org/doi/pdf/10.1021/acsami.6b09984 by Z Geng - 2016 - Related articles Pure phase manganese oxides have been widely studied as water oxidation catalysts, ... We consider that the enhanced water oxidation activity ...... Energetic Basis of Catalytic Activity of Layered Nanophase Calcium Manganese Oxides for. δ-MnO2–Mn3O4 Nanocomposite for Photochemical Water Oxidation ... pubs.acs.org/doi/full/10.1021/acsami.6b09984 by Z Geng - 2016 - Related articles Sep 29, 2016 - δ-MnO2–Mn3O4 Nanocomposite for Photochemical Water Oxidation: Active ... We consider that the enhanced water oxidation activity could be ... Oxygen vacancy induced enhancement of photochemical water ... https://www.infona.pl/.../bwmeta1.element.elsevier-9af2b069-393b-38a0-9080-c2a6b22... by G Zhang - 2017 - Related articles The oxygen-deficient Ca 2 Mn 2 O 5 perovskite nanoparticles exhibit ... enhancement of photochemical water oxidation on calcium manganese oxide catalyst. Water-oxidation catalysis by manganese in a geochemical-like cycle ... www.nature.com › Home › archive › issue › Article The development of an effective, cheap and robust water oxidation catalyst is ... Visible-light-enhanced catalytic oxidation reactions on plasmonic silver ... solid is responsible for the observed photochemical water-oxidation catalysis. .... Najoafpour, M. M., Ehrenberg, T., Wiechen, M. & Kurz, P. Calcium manganese(III) oxides ...
