journal article·2019-10-22Open access

Anion Vacancies Regulating Endows MoSSe with Fast and Stable Potassium Ion Storage

Hanna He, Dan Huang, Qingmeng Gan, Junnan Hao, Sailin Liu, Zhibin Wu, Wei Kong Pang, Bernt Johannessen, Yougen Tang, Jing-Li Luo, Haiyan Wang, Zaiping Guo

ACS Nano· Volume 13· Issue 10

Abstract

Vacancy engineering is a promising approach for optimizing the energy storage performance of transition metal dichalcogenides (TMDs) due to the unique properties of vacancies in manipulating the electronic structure and active sites. Nevertheless, achieving effective introduction of anion vacancies with adjustable vacancy concentration on a large scale is still a big challenge. Herein, MoS2(1–x)Se2x alloys with anion vacancies introduced in situ have been achieved by a simple alloying reaction, and the vacancy concentration has been optimized through adjusting the chemical composition. Experimental and density functional theory calculation results suggest that the anion vacancies in MoS2(1–x)Se2x alloys could enhance the electronic conductivity, induce more active sites, and alleviate structural variation in the alloys during the potassium storage process. When applied as potassium ion battery anodes, the most optimized vacancy-rich MoSSe alloy delivered high reversible capacities of 517.4 and 362.4 mAh g–1 at 100 and 1000 mA g–1, respectively. Moreover, a reversible capacity of 220.5 mAh g–1 could be maintained at 2000 mA g–1 after 1000 cycles. This work demonstrates a practical approach to modifying the electronic and defect properties of TMDs, providing an effective strategy for constructing advanced electrode materials for battery systems.
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Research context

OpenAlex topics: 2D Materials and Applications · MXene and MAX Phase Materials · Inorganic Chemistry and Materials

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

Affiliations

Institute for Superconducting & Electronic Materials, School of Mechanical, Materials, Mechatronic, and Biomedical Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia

Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China

Guangxi Key Laboratory for Relativistic Astrophysics, Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Key Laboratory of Processing for Non-Ferrous Metallic and Featured Materials, School of Physical Science and Technology, Guangxi University, Nanning, 530004, People’s Republic of China

Australian Synchrotron, Clayton, VIC 3168, Australia

College of Materials Science and Engineering, Shenzhen University, 1066 Xueyuan Avenue, Shenzhen 518055, Guangdong Province, People’s Republic of China

Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada

Funding

Central South University · Australian Research Council · China Scholarship Council · Hunan Province

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