New two-dimensional transition metal borides for Li ion batteries and electrocatalysis

Exploring new two-dimensional (2D) crystals attracts great interest in the materials community due to their potential intriguing properties. Here, we report a new family of 2D transition metal borides (labeled as MBenes) that can be produced by selectively etching the A layer from a family of layere...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2017, Vol.5 (45), p.23530-23535
Main Authors: Guo, Zhonglu, Zhou, Jian, Sun, Zhimei
Format: Article
Language:English
Subjects:
Batteries
Borides
Catalysis
Catalytic activity
Crystals
Diffusion barriers
Electrocatalysis
Electrode materials
Energy storage
Etching
Free energy
Gibbs free energy
Hydrogen
Hydrogen evolution reactions
Hydrogen storage
Hydrogen-based energy
Lithium-ion batteries
Mechanical properties
Metals
Modulus of elasticity
Rechargeable batteries
Storage capacity
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Summary:Exploring new two-dimensional (2D) crystals attracts great interest in the materials community due to their potential intriguing properties. Here, we report a new family of 2D transition metal borides (labeled as MBenes) that can be produced by selectively etching the A layer from a family of layered transition metal borides (MAB phases). The emerged MBenes are demonstrated to possess great stability with isotropic and ultrahigh Young's modulus. Meanwhile, our results show that 2D Mo 2 B 2 and Fe 2 B 2 MBenes are metallic with excellent electronic conductivity, which are highly desirable for applications in Li-ion batteries (LIB) and electrocatalysis. Furthermore, 2D Mo 2 B 2 and Fe 2 B 2 are confirmed to have an omnidirectional small diffusion energy barrier and high storage capacity for Li atoms, which highlight MBenes as appealing electrode materials for LIBs. Moreover, 2D Fe 2 B 2 MBene also exhibits superior catalytic activity for the hydrogen evolution reaction (HER) with hydrogen adsorption Gibbs free energy close to the optimal value (0 eV), indicating its promising application as an electrocatalyst for hydrogen evolution. Considering the large number of possible MAB phases, more MBenes with attractive applications are anticipated theoretically and/or experimentally in the near future.
ISSN:2050-7488
2050-7496
DOI:10.1039/C7TA08665B