Rare-Earth (R) In-Plane Ordering in Novel (Mo, R, Nb) 4 AlC 3 Quinary o-MAX Nanolaminates and their 2D Derivatives.

Autor: Guo H; Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110819, China., Fu X; International Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China., Peng L; Key Laboratory of Rare Earths, Chinese Academy of Sciences, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, China., Wang C; College of Sciences, Northeastern University, Shenyang, 110819, China., Zhuang Y; Key Laboratory of Rare Earths, Chinese Academy of Sciences, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, China., Chong H; Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110819, China., Chen Z; Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110819, China., Gong W; College of Sciences, Northeastern University, Shenyang, 110819, China., Yan M; School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Zhejiang University, Hangzhou, 310027, China., Wang Q; Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110819, China., Cui W; Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110819, China.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2024 Sep; Vol. 36 (36), pp. e2404466. Date of Electronic Publication: 2024 Jul 28.
DOI: 10.1002/adma.202404466
Abstrakt: Nanolamellar transition metal carbides are gaining increasing attentions because of the promising application in energy storage of their 2D derivatives. There are in-plane and out-of-plane atomic ordered occupations, which is thought to only be formed in separated systems due to totally different origins and crystallographic structure. In present work, starting from (Mo, Nb) 4 AlC 3 o-MAX phase where out-of-plane ordered occupation is experimentally and theoretically proved for Mo/Nb atoms, rare-earth elements (R = Y, Gd-Tm, Lu) are introduced, and the novel Mo 3.33- x R 0.67 Nb x AlC 3 (x = 1, 1.25, 1.5, 1.75, 2, 2.25, and 2.5) super-ordered (s-) MAX phase is synthesized, where R is ordered at the outer layer in the strict stoichiometry meanwhile Mo/Nb maintains the out-of-plane ordered occupation. By R introduction, s-MAX is easier to be delaminated to obtain the s-MXene with the topochemical ordered vacancies, leading into the enhanced supercapacitance of 114.9 F g -1 in Mo 1.33 Nb 2 C 3 s-MXene compared with 95.1 F g -1 in Mo 2 Nb 2 C 3 o-MXene. By Pt anchoring, very low overpotential of 22 mV at a current density of 10 mA cm -2 is achieved for HER applications. This study demonstrates a novel variety of s-MAX phase and seeks to inspire further exploration of the ordered MAX and MXene families.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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