Journal Article

PUBDB-2024-07194

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png MXenes with ordered triatomic-layer borate polyanion terminations

Li, D. ; Zheng, W. ; Gali, S. M. ; Sobczak, K. ; Horák, M. ; Polčák, J. ; Lopatik, N. ; Li, Z. ; Zhang, J.Extern* ; Sabaghi, D. ; Zhou, S.Extern* ; Michałowski, P. P. ; Zschech, E. ; Brunner, E. ; Donten, M. ; Šikola, T. ; Bonn, M. ; Wang, H. I. (Corresponding author)Extern* ; Beljonne, D. (Corresponding author) ; Yu, M. (Corresponding author)Extern* ; Feng, X. (Corresponding author)Extern*

2024
Nature Publishing Group Basingstoke

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Please use a persistent id in citations: doi:10.1038/s41563-024-01911-2

Abstract: Surface terminations profoundly influence the intrinsic properties of MXenes, but existing terminations are limited to monoatomic layers or simple groups, showing disordered arrangements and inferior stability. Here we present the synthesis of MXenes with triatomic-layer borate polyanion terminations (OBO terminations) through a flux-assisted eutectic molten etching approach. During the synthesis, Lewis acidic salts act as the etching agent to obtain the MXene backbone, while borax generates BO2− species, which cap the MXene surface with an O–B–O configuration. In contrast to conventional chlorine/oxygen-terminated Nb2C with localized charge transport, OBO-terminated Nb2C features band transport described by the Drude model, exhibiting a 15-fold increase in electrical conductivity and a 10-fold improvement in charge mobility at the d.c. limit. This transition is attributed to surface ordering that effectively mitigates charge carrier backscattering and trapping. Additionally, OBO terminations provide Ti3C2 MXene with substantially enriched Li+-hosting sites and thereby a large charge-storage capacity of 420 mAh g−1. Our findings illustrate the potential of intricate termination configurations in MXenes and their applications for (opto)electronics and energy storage.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. GrapheneCore3 - Graphene Flagship Core Project 3 (881603) (881603)
3. LIGHT-CAP - MULTI-ELECTRON PROCESSES FOR LIGHT DRIVEN ELECTRODES AND ELECTROLYTES IN CONVERSION AND STORAGE OF SOLAR ENERGY (101017821) (101017821)
4. GREENCAP - Graphene, MXene and ionic liquid-based sustainable supercapacitor (101091572) (101091572)
5. SFB 1415 A10 - Synthese von Definierten, Chiralen 2D Kovalenten Organischen 2D Gerüstverbindungen (A10*) (544187141) (544187141)

Experiment(s):

1. PETRA Beamline P65 (PETRA III)

Appears in the scientific report 2024

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Database coverage:
; BIOSIS Previews ; Biological Abstracts ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Nature ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 40 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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