journal article·2017-04-25Open access

Synthesis and Electrochemical Properties of Two-Dimensional Hafnium Carbide

Jie Zhou, Xianhu Zha, Xiaobing Zhou, Fanyan Chen, Guoliang Gao, Shuwei Wang, Cai Shen, Tao Chen, Chunyi Zhi, Per Eklund, Shiyu Du, Jianming Xue, Weiqun Shi, Zhifang Chai, Qing Huang

ACS Nano· Volume 11· Issue 4

Abstract

We demonstrate fabrication of a two-dimensional Hf-containing MXene, Hf 3 C 2 T z, by selective etching of a layered parent Hf 3 [Al(Si)] 4 C 6 compound. A substitutional solution of Si on Al sites effectively weakened the interfacial adhesion between Hf–C and Al(Si)–C sublayers within the unit cell of the parent compound, facilitating the subsequent selective etching. The underlying mechanism of the Si-alloying-facilitated etching process is thoroughly studied by first-principles density functional calculations. The result showed that more valence electrons of Si than Al weaken the adhesive energy of the etching interface. The MXenes were determined to be flexible and conductive. Moreover, this 2D Hf-containing MXene material showed reversible volumetric capacities of 1567 and 504 mAh cm –3 for lithium and sodium ions batteries, respectively, at a current density of 200 mAg –1 after 200 cycles. Thus, Hf 3 C 2 T z MXenes with a 2D structure are candidate anode materials for metal-ion intercalation, especially for applications where size matters.
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Research context

OpenAlex topics: MXene and MAX Phase Materials · 2D Materials and Applications · Ferroelectric and Negative Capacitance Devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Engineering Laboratory of Specialty Fibers and Nuclear Energy Materials, Ningbo Institute of Materials Engineering and Technology, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China

University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing 100049, China

Energy Storage Division, Ningbo Institute of Materials Engineering and Technology, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China

Department of Physics and Material Science, City University of Hong Kong, Kowloon, Hong Kong SAR China

Thin Film Physics Division, Linköping University, IFM, 581 83 Linköping, Sweden

State Key Laboratory of Nuclear Physics and Technology, CAPT and IFSA Collaborative Innovation Center of MoE, Peking University, Beijing 100871, China

Laboratory of Nuclear Energy Chemistry and Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Funding

Stiftelsen f?r?Strategisk Forskning · National Natural Science Foundation of China · Chinese Academy of Sciences

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