Journal
ADVANCED MATERIALS
Volume 34, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202105541
Keywords
electrocatalysts; lithium-sulfur batteries; polysulfides; quasi-metal-organic-frameworks; sulfur reduction reaction
Categories
Funding
- Department of Science and Technology of Guangdong province [2019JC01L203, 2020B0909030004]
- Science and Technology Program of Guangzhou [2019050001]
- China Postdoctoral Science Foundation [2021M691087]
- Science and Technology Program of Zhaoqing [2019K038]
- Program for the Outstanding Young Talents of Hebei Province, China
- Chunhui Project of Ministry of Education of the People's Republic of China [Z2017010]
- Natural Sciences and Engineering Research Council of Canada
- University of Waterloo
- Waterloo Institute for Nanotechnology
Ask authors/readers for more resources
This study presents a strategy to design quasi-MOF nanospheres as sulfur electrocatalysts by incorporating a transition-state structure between MOF and metal oxides via controlled ligand exchange strategy. The quasi-MOF inherits the porous structure of MOF and exposes abundant metal nodes to act as active sites for strong LiPs absorbability, resulting in remarkable catalytic activity and long-term cycling stability in Li-S batteries.
Lithium-sulfur (Li-S) batteries are considered as one of the most promising next-generation rechargeable batteries owing to their high energy density and cost-effectiveness. However, the sluggish kinetics of the sulfur reduction reaction process, which is so far insufficiently explored, still impedes its practical application. Metal-organic frameworks (MOFs) are widely investigated as a sulfur immobilizer, but the interactions and catalytic activity of lithium polysulfides (LiPs) on metal nodes are weak due to the presence of organic ligands. Herein, a strategy to design quasi-MOF nanospheres, which contain a transition-state structure between the MOF and the metal oxide via controlled ligand exchange strategy, to serve as sulfur electrocatalyst, is presented. The quasi-MOF not only inherits the porous structure of the MOF, but also exposes abundant metal nodes to act as active sites, rendering strong LiPs absorbability. The reversible deligandation/ligandation of the quasi-MOF and its impact on the durability of the catalyst over the course of the electrochemical process is acknowledged, which confers a remarkable catalytic activity. Attributed to these structural advantages, the quasi-MOF delivers a decent discharge capacity and low capacity-fading rate over long-term cycling. This work not only offers insight into the rational design of quasi-MOF-based composites but also provides guidance for application in Li-S batteries.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available