Heterostructure engineering of molybdenum chalcogenides for stable sodium storage

ABSTRACT

The design and controllable synthesis of active sodium electrode materials is exceedingly desired but remains a grand challenge. In this work we designed weave-like heterostructure films of molybdenum chalcogenide as self-supported electrodes for efficient sodium storage. Electrochemical test results show that the molybdenum chalcogenide film enables a large reversible capacity (619 mAh g⁻¹) and an excellent rate capability (325 mAh g⁻¹ at 3000 mA g⁻¹) when used as sodium anode. The film also exhibits a remarkable cycling stability, sustaining 90% capacity over 150 continuous cycles at a high rate of 3000 mA g⁻¹. Considering its high initial current efficient, such engineered film electrodes may fulfill the stringent requirement for practical application.

KEYWORDS:

• Molybdenum chalcogenide
• heterostructure
• sodium-ion battery

Acknowledgments

The authors are grateful to the financial support of the National Natural Science Foundation of China (Grant Nos. 51672182 and 51772197), the Thousand Young Talents Plan, the Jiangsu Natural Science Foundation (Grant Nos. BK20151219), the Key University Science Research Project of Jiangsu Province (Grant No. 17KJA430013), the 333 High-Level Talents Project in Jiangsu Province, the Six Talent Peaks Project in Jiangsu Province, and of the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [51672182 and 51772197];Key University Science Research Project of Jiangsu Province [17KJA430013];Jiangsu Natural Science Foundation [BK20151219];