Facet-Engineered Tungsten Disulfide for Promoting Polysulfide Electrocatalysis in Lithium-Sulfur Batteries

被引：9

作者：

Abraham, Akhil Mammoottil ^{[1
]}

Ponnurangam, Sathish ^{[2
]}

Thangadurai, Venkataraman ^{[1
]}

机构：

[1] Univ Calgary, Dept Chem, Calgary, AB T2N 1N4, Canada

[2] Univ Calgary, Dept Chem & Petr Engn, Calgary, AB T2N 1N4, Canada

来源：

INORGANIC CHEMISTRY | 2021年 / 60卷 / 17期

基金：

加拿大自然科学与工程研究理事会;

关键词：

CATHODE; ELECTROLYTE; CONVERSION;

D O I：

10.1021/acs.inorgchem.1c01241

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Distinct facets of an electrocatalyst can promote polysulfide (Li2Sn (n = 4, 6, 8) and Li2Sm (m = 1, 2)) redox kinetics in lithiumsulfur (LiS) battery chemistry. Herein, we report that the (100) facet of tungsten disulfide (e-WS2) generated in situ by electrochemical pulverization exhibits onset potentials of 2.52 and 2.32 V vs Li/Li+, respectively, for the reduction of polysulfides Li2Sn and Li2Sm, which is unprecedented till date. In a comparable study, bulk WS2 was synthesized ex situ. The transmission electron microscopy (TEM) analysis reveals that the (100) facet was dominant in e-WS2, while the (002) facet was pronounced in bulk WS2. The density functional theory (DFT) analysis indicates that the (100) facet displays metallic-like behavior, which is highly desired for enhanced polysulfide redox kinetics. We believe that the e-WS2 produced can potentially be an excellent electrocatalyst for other applications such as hydrogen evolution reaction (HER), photocatalysis, and CO2 reduction.

引用

页码：12883 / 12892

页数：10

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