Volume 62, Issue 36 e202308436
Research Article

Discovery of Two-dimensional Hexagonal MBene HfBO and Exploration on its Potential for Lithium-Ion Storage

Nanxi Miao

Nanxi Miao

State Key Laboratory of Solidification Processing, School of Materials Science and Engineering Department, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072 P. R. China

These authors contributed equally to this work.

Contribution: Data curation (lead), Formal analysis (equal), Funding acquisition (equal), Software (lead), Writing - original draft (lead)

Search for more papers by this author
Prof. Yutong Gong

Prof. Yutong Gong

State Key Laboratory of Solidification Processing, School of Materials Science and Engineering Department, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072 P. R. China

These authors contributed equally to this work.

Contribution: Data curation (equal), Formal analysis (equal), Funding acquisition (equal), Validation (equal), Writing - original draft (equal), Writing - review & editing (equal)

Search for more papers by this author
Huaiyu Zhang

Huaiyu Zhang

State Key Laboratory of Solidification Processing, School of Materials Science and Engineering Department, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072 P. R. China

Contribution: Formal analysis (equal), Software (equal)

Search for more papers by this author
Qing Shen

Qing Shen

State Key Laboratory of Solidification Processing, School of Materials Science and Engineering Department, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072 P. R. China

Contribution: Formal analysis (equal), ​Investigation (equal), Software (equal)

Search for more papers by this author
Rui Yang

Rui Yang

State Key Laboratory of Solidification Processing, School of Materials Science and Engineering Department, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072 P. R. China

Contribution: ​Investigation (equal)

Search for more papers by this author
Prof. Jianping Zhou

Prof. Jianping Zhou

School of Physics & Information Technology, Shaanxi Normal University, Xi'an, 710119 P. R. China

Contribution: Formal analysis (equal), ​Investigation (equal)

Search for more papers by this author
Prof. Hideo Hosono

Prof. Hideo Hosono

MDX Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa, 226-8503 Japan

Contribution: Funding acquisition (equal), ​Investigation (equal), Writing - review & editing (equal)

Search for more papers by this author
Prof. Junjie Wang

Corresponding Author

Prof. Junjie Wang

State Key Laboratory of Solidification Processing, School of Materials Science and Engineering Department, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072 P. R. China

Contribution: Conceptualization (lead), Data curation (equal), Formal analysis (equal), Funding acquisition (equal), Supervision (lead), Writing - original draft (lead), Writing - review & editing (lead)

Search for more papers by this author
First published: 14 July 2023
Citations: 13

Graphical Abstract

A combination of DFT calculations and experiments were used to discover a large class of exfoliable h-MAB phases and their derivative h-MBenes. A representative 2D h-MBene, HfBO, was successfully synthesized by selectively etching the In layers from Hf2InB2. The synthesized 2D HfBO was demonstrated to show lithium-ion storage performance for the first time.

Abstract

The practical applications of two-dimensional (2D) transition-metal borides (MBenes) have been severely hindered by the lack of accessible MBenes because of the difficulties in the selective etching of traditional ternary MAB phases with orthorhombic symmetry (ort-MAB). Here, we discover a family of ternary hexagonal MAB (h-MAB) phases and 2D hexagonal MBenes (h-MBenes) by ab initio predictions and experiments. Calculations suggest that the ternary h-MAB phases are more suitable precursors for MBenes than the ort-MAB phases. Based on the prediction, we report the experimental synthesis of h-MBene HfBO by selective removal of In from h-MAB Hf2InB2. The synthesized 2D HfBO delivered a specific capacity of 420 mAh g−1 as an anode material in lithium-ion batteries, demonstrating the potential for energy-storage applications. The discovery of this h-MBene HfBO added a new member to the growing family of 2D materials and provided opportunities for a wide range of novel applications.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.