Facile one-step synthesis of g-C3N4-supported WS2 with enhanced lithium storage properties
- 주제(키워드) WS2 , G-C3N4 , WS2/g-C3N4 composite , Anode materials , Lithium-ion battery
- 주제(기타) Electrochemistry
- 설명문(일반) [Ha Tran Huu; Van Phuc Nguyen; Thi Thanh Huong Nguyen; Van Thang Nguyen; Vien Vo] Quy Nhon Univ, Dept Chem, 170 An Duong Vuong, Quy Nhon, Binh Dinh, Vietnam; [Le, Hang T. T.] Hanoi Univ Sci & Technol, Sch Chem Engn, Dept Electrochem & Corros Protect, 1 Dai Co Viet, Hanoi, Vietnam; [Thi Xuan Dieu Nguyen; Kim, Sung-Jin] Ewha Womans Univ, Dept Chem & Nano Sci, Seoul 120750, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 PERGAMON-ELSEVIER SCIENCE LTD
- 발행년도 2020
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000169478
- 본문언어 영어
- Published As https://dx.doi.org/10.1016/j.electacta.2020.136010
초록/요약
Composites of WS2 nanosheets integrated with g-C3N4 were synthesized using a facile solid-state reaction method from a precursor mixture of tungstic acid and thiourea under an inert gas, and denoted as WS/CN-x where x is the weight ratio of thiourea/tungstic acid. In the composites, highly exfoliated-WS2 sheets were dispersed evenly onto the g-C3N4 matrix. The intimate contact between the WS2 nanosheets and g-C3N4 flakes was confirmed using TEM, FTIR, and XPS analyses. Among the composites, WS/CN-5 exhibited excellent lithium storage performance. Even at a high current density of 1000 mA g(-1), the composite electrode delivered a reversible capacity of 622.7 mAh g(-1) after 400 charge-discharge cycles. The enhanced lithium storage capacity of the composite stems from the even distribution of WS2 nanosheets as active electrode material on the g-C3N4 matrix. The presence of g-C3N4 as a supporting framework for the WS2 nanosheets significantly improved the kinetics of the charge transport process and alleviated the strains caused by the volume change in the nanostructured WS2 during the chargedischarge process. In addition, the enhanced lithium storage performance of the WS2/g-C3N4 composites was also attributed to the high contribution of the pseudocapacitive effect. (C) 2020 Elsevier Ltd. All rights reserved.
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