Shared posts

13 Sep 09:17

2D Metallic Transition‐Metal Dichalcogenides: Structures, Synthesis, Properties, and Applications

by Bei Zhao, Dingyi Shen, Zucheng Zhang, Ping Lu, Mongur Hossain, Jia Li, Bo Li, Xidong Duan
Metallic/semimetallic transition metal dichalcogenides (m‐TMDs) have grabbed widespread attention in recent years due to their exotic physical properties and potential applications in various fields. The state‐of‐the‐art progress in m‐TMDs is reviewed, including: electronic and crystal structures, synthetic methods, physical properties, and practical applications. Moreover, views on development, challenges, and future prospects of m‐TMDs are put forward. Abstract 2D materials and the associated heterostructures define an ideal material platform for investigating physical and chemical properties, and exhibiting new functional applications in (opto)electronic devices, electrocatalysis, and energy storage. 2D transition metal dichalcogenides (2D TMDs), as a member of the 2D materials family including 2D semiconducting TMDs (s‐TMDs) and 2D metallic/semimetallic TMDs (m‐TMDs) have attracted considerable attention in the scientific community. Over the past decade, the 2D s‐TMDs have been extensively researched and reviewed elsewhere. Because of their distinctive physical properties including intrinsic magnetism, charge‐density‐wave order and superconductivity, and potential applications, such as high‐performance electronic devices, catalysis, and as metal electrode contacts, 2D m‐TMDs have grabbed widespread attention in recent years. However, reviews demonstrating the m‐TMDs systematically and comprehensively have been rarely reported. Here, the recent advances in 2D m‐TMDs in the aspects of their unique structures, synthetic approaches, distinctive physical properties, and functional applications are highlighted. Finally, the current challenges and perspectives are discussed.
12 Aug 01:51

Hierarchical Assembly of CNTs-VSe(2)-VO(x)/S for Flexible Lithium-Sulfur Batteries

by Jing Qi

ACS Appl Mater Interfaces. 2021 Aug 25;13(33):39186-39194. doi: 10.1021/acsami.1c07204. Epub 2021 Aug 10.

ABSTRACT

Constructing highly conductive compact sulfur cathode composites with shorter ion diffusivity lengths is vital for achieving comprehensively superior electrochemical performance under a high mass loading condition. Guided by computerization modeling, we, herein, report self-supporting CNTs-VSe2-VOx/S assembly with balanced tortuosity and porosity for flexible Li-S batteries. The resultant hybrid sulfur cathode with a tortuosity of 2.42 and a porosity of 0.44 delivers prominent rate performance and cycling stability with a medium sulfur loading. More importantly, we demonstrate that the pouch cells with a high sulfur loading of 6.0 mg cm-2 and a low electrolyte to sulfur ratio of 4.2 μL mg-1 could synchronously deliver high gravimetric/volumetric energy densities of 424.1 Wh kg-1 and 469.2 Wh L-1, as well as decent cycling behavior under arbitrary bending conditions, which provides a ponderable reference for future flexible and wearable electronic devices.

PMID:34376048 | DOI:10.1021/acsami.1c07204

14 Jul 00:53

A passive perspiration biofuel cell: High energy return on investment

by Lu Yin, Jong-Min Moon, Juliane R. Sempionatto, Muyang Lin, Mengzhu Cao, Alexander Trifonov, Fangyu Zhang, Zhiyuan Lou, Jae-Min Jeong, Sang-Jin Lee, Sheng Xu, Joseph Wang
A touch-based biofuel cell that harvests bioenergy from natural perspiration and features a high energy return on investment is described. Such biofuel cells can operate continuously on a finger even without any active movement during overnight sleep and can be readily integrated with piezoelectric generators to synergistically harvest energy from fingertip pressing. The practical use of the scavenged energy is demonstrated in the powering of an integrated sensor with a dedicated display panel.
15 Feb 17:39

Highly Selective and Efficient Removal of Heavy Metals by Layered Double Hydroxide Intercalated with the MoS42– Ion

by Lijiao Ma, Qing Wang, Saiful M. Islam, Yingchun Liu, Shulan Ma and Mercouri G. Kanatzidis

TOC Graphic

Journal of the American Chemical Society
DOI: 10.1021/jacs.6b00110