Herein we electrochemically and selectively extract Ti from the MAX phase Ti2SC to form carbon/sulfur (C/S) nanolaminates at room temperature. The products are composed of multi-layers of C/S flakes, with predominantly amorphous and some graphene-like structures. Covalent bonding between C and S is observed in the nanolaminates, which render the latter promising candidates as electrode materials for Li-S batteries. We also show that it is possible to extract Ti from other MAX phases, such as Ti3AlC2, Ti3SnC2, and Ti2GeC, suggesting that electrochemical etching can be a powerful method to selectively extract the "M" elements from the MAX phases, to produce "AX" layered structures, that cannot be made otherwise. The latter hold promise for a variety of applications, such as energy storage, catalysis, etc.

Herein we electrochemically and selectively extract Ti from the MAX phase Ti 2 SC to form carbon/sulfur (C/S) nanolaminates at room temperature. The products are composed of multi-layers of C/S flakes, with predominantly amorphous and some graphene-like structures. Covalent bonding between C and S is observed in the nanolaminates, which render the latter promising candidates as electrode materials for Li-S batteries. We also show that it is possible to extract Ti from other MAX phases, such as Ti 3 AlC 2 , Ti 3 SnC 2 , and Ti 2 GeC, suggesting that electrochemical etching can be a powerful method to selectively extract the "M" elements from the MAX phases, to produce "AX" layered structures, that cannot be made otherwise. The latter hold promise for a variety of applications, such as energy storage, catalysis, etc.

An electrochemical method … …has been developed to selectively extract Ti from the MAX phase Ti2SC to give C/S nanolaminates composed predominantly of amorphous and some graphene-like nanoflakes.Int heir Communication on page 4810 ff., Y. Gogotsi et al. demonstrate the C/S nanolaminates to be promising cathode candidates for Li/S batteries.T hey also show that it is possible to electrochemically selectively extract Ti from an umber of other MAX phases to create anew class of "A X" phases,most of which should be nanolayered.

…w urde entwickelt, mit der Ti selektiv aus der MAX-Phase Ti 2 SC extrahiert werden kann, um C/S-Nanolaminate zu gewinnen, die vornehmlich aus amorphen sowie einigen graphenartigen Nanoflocken bestehen. In der Zuschrift auf S. 4892 ff.u ntersuchen Y. Gogotsi et al. die C/S-Nanolaminate als vielversprechende Kathodenmaterialien für Li/S-Batterien. Sie zeigen außerdem, dass Ti aus einer Reihe anderer MAX-Phasen elektrochemisch extrahiert werden kann, um eine neue Klasse von "AX"-Phasen zu erhalten, von denen die meisten als Nanoschichtstrukturen vorliegen sollten.