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LiMn 2 O 4 and LiMn 2 x Co x O 4 thin fi lms using the MASA approach as e ffi cient water oxidation electrocatalysts †
| Content Provider | Semantic Scholar |
|---|---|
| Author | Balci, Fadime Mert Karakaya, Irmak Alsaç, Nar Yaman, Muammer Yusuf Saat, Gülbahar Karadas, Ferdi Ülgüt, Burak Dag, Ömer |
| Copyright Year | 2018 |
| 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 m 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 mesoLiMn1 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 , is obtained for meso-LiMnCoO4, which remains as a robust and efficient film even at a current density of 120 mA cm . |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://yoksis.bilkent.edu.tr/pdf/files/13513.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
