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Issue 28, 2018
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Synthesis of mesoporous LiMn2O4 and LiMn2−xCoxO4 thin films using the MASA approach as efficient water oxidation electrocatalysts

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Abstract

Mesoporous, highly active, robust, and cost-effective thin films are in big demand for water splitting by electrocatalysis. Molten-salt assisted self-assembly (MASA) is an effective method to synthesize mesoporous thin films. Transparent clear solutions of salts (LiNO3 and [Mn(H2O)6](NO3)2), acid (HNO3), and surfactants (CTAB and P123) can be spin-coated over substrates as liquid crystalline (LC) films and calcined to obtain mesoporous high quality transparent thin films. A mixture of three salts (LiNO3, [Mn(H2O)6](NO3)2, and [Co(H2O)6](NO3)2) also forms LC mesophases that can be calcined to produce mesoporous nanocrystalline mixed metal lithiates (meso-LiMn2−xCoxO4) with surface areas as large as 144 m2 g−1 (for LiMn1.5Co0.5O4). The synergic effects of these salts improve the pore-size of the final products; the pore size drops from around 11 nm (in the meso-LiMn2O4) to 6–7 nm in the meso-LiMn1−xCoxO4. The meso-LiMn2−xCoxO4 films were tested at pH 13.6 as water oxidation electrocatalysts over a broad range of x. While meso-LiMn2O4 shows a low activity towards water oxidation, the catalytic activity increases with the increasing Co(III) content of the films. The highest mass activity per cobalt, 1744 A g−1, is obtained for meso-LiMnCoO4, which remains as a robust and efficient film even at a current density of 120 mA cm−2.

Graphical abstract: Synthesis of mesoporous LiMn2O4 and LiMn2−xCoxO4 thin films using the MASA approach as efficient water oxidation electrocatalysts

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Publication details

The article was received on 04 May 2018, accepted on 24 Jun 2018 and first published on 25 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA04138E
Citation: J. Mater. Chem. A, 2018,6, 13925-13933
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    Synthesis of mesoporous LiMn2O4 and LiMn2−xCoxO4 thin films using the MASA approach as efficient water oxidation electrocatalysts

    F. M. Balci, I. Karakaya, E. P. Alsaç, M. Y. Yaman, G. Saat, F. Karadas, B. Ülgüt and Ö. Dag, J. Mater. Chem. A, 2018, 6, 13925
    DOI: 10.1039/C8TA04138E

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