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Layered and two dimensional metal oxides for electrochemical energy conversion

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Abstract

The oxygen evolution and reduction reactions are two extremely important reactions in terms of energy applications. Currently, the Oxygen Evolution Reaction (OER) hinders the efficient running of electrolyzer devices which convert water into molecular H2. This H2 can subsequently be used in a H2/O2 fuel cell for the renewable generation of electricity with only H2O as a by-product. However, this fuel cell process is not economy feasible due to the sluggish kinetics of the Oxygen Reduction Reaction (ORR) at the device cathode, even with expensive state-of-the-art electrocatalytic materials. As of late, the amount of interest in the OER and ORR, from research laboratories from all over the globe, has risen rapidly in order to find cheap and efficient catalysts to replace the expensive platinum based catalysts currently used in the two aforementioned energy conversion/generation technologies. Layered transition metal oxides, based on the cheap transition metal oxides Mn, Co, Ni and Fe have been reported as viable catalysts for the OER and ORR. Layered structures have an added advantage over non-layered materials as the surface area can be increase by means of exfoliation, with potential for tailoring electrocatalytic activity. It has been shown that the fabrication process and post-synthetic treatments, e.g. anion exchange or exfoliation, of these materials can alter the catalytic activity of these materials. Here we summarise various fabrication methods and modifications utilised in literature to tailor the performance of layered transition metal and hydroxide based catalysts for the ORR and OER toward that of the state-of-the-art materials for these technologies.

Graphical abstract: Layered and two dimensional metal oxides for electrochemical energy conversion

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Publication details

The article was received on 26 Aug 2018, accepted on 04 Oct 2018 and first published on 17 Oct 2018


Article type: Review Article
DOI: 10.1039/C8EE02495B
Citation: Energy Environ. Sci., 2018, Advance Article
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    Layered and two dimensional metal oxides for electrochemical energy conversion

    M. P. Browne, Z. Sofer and M. Pumera, Energy Environ. Sci., 2018, Advance Article , DOI: 10.1039/C8EE02495B

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