Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 41, Issue 4, Pages 2466-2476Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.11.003
Keywords
Artificial photosynthesis; Carbon aerogel; Manganese oxide; Nanotechnology; Oxygen; Self-healing; Water oxidation
Categories
Funding
- Ministry of Education of Japan [26220801]
- JSPS, MEXT, Japan [24000018]
- Russian Science Foundation [14-14-00039]
- Azarbaijan Shahid Madani University
- Grants-in-Aid for Scientific Research [24000018, 26220801] Funding Source: KAKEN
- Russian Science Foundation [14-14-00039] Funding Source: Russian Science Foundation
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The water-oxidizing complex or oxygen-evolving complex in plants, algae and cyanobacteria is an Mn4CaO5 cluster catalysing light-induced water oxidation. Herein we report that nano-sized Mn oxide/carbon aerogel is an active and low-density catalyst toward water oxidation. The composite was synthesized by a simple, low-cost procedure with different ratio of carbon aerogel to Mn oxide and characterized by scanning electron microscopy, energy-dispersive spectroscopy, high resolution transmission electron microscopy, X-ray diffraction, electronic spectroscopy, Fourier transform infrared spectroscopy, and atomic absorption spectroscopy. Then, the water-oxidizing activity of this composite was considered in the presence of cerium(IV) ammonium nitrate. The composites with a high ratio of Mn oxide to carbon aerogel are good Mn-based catalysts with turnover frequencies of similar to 0.33 (mmol O-2/(mol Mn.s)). In addition to the water-oxidizing activities of these composites under different conditions, their self-healing reaction in the presence of cerium(IV) ammonium nitrate was studied. We also compare the composite with graphene quantum dots/Mn oxide, which is not stable under these conditions. Using hydrogen to store sustainable energies is a promising strategy in the near future and our results show that nanosized Mn oxide/carbon aerogel is a promising catalyst for water-splitting systems toward hydrogen evolution. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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