插层(化学)
二硫化钼
过电位
电化学
剥脱关节
材料科学
范德瓦尔斯力
分解水
催化作用
无机化学
石墨烯
氢
钼
化学工程
电催化剂
锂(药物)
电极
纳米技术
化学
物理化学
分子
复合材料
有机化学
冶金
光催化
医学
内分泌学
工程类
作者
Victor Shokhen,David Zitoun
出处
期刊:FlatChem
[Elsevier]
日期:2019-03-01
卷期号:14: 100086-100086
被引量:5
标识
DOI:10.1016/j.flatc.2019.100086
摘要
The intercalation of alkaline cations such as lithium and sodium into two-dimensional (2D) van der Waals materials effectively modifies their electronic structure. Here, we show an electrochemical intercalation process of an alkaline ion (Li+ or Na+), into vertically aligned molybdenum disulfide (MoS2) thin films by using a three-electrode flooded vessel cell, and its application as electrocatalyst for hydrogen evolution reaction. The electrochemical intercalation method is controlled by the applied current density. After electrochemical insertion, the vertically alligned MoS2 layers display an extended Wan der Waals gap. The Li and Na intercalated vertically alligned MoS2 layers demonstrate an overpotential of 0.29 V at 10 mA cm−2 towards hydrogen evolution reaction (HER) in 0.5 M H2SO4. The intercalation of Li+ or Na+ leads to the partial exfoliation of the 2D layered material. Nevertheless, the Na intercalated catalyst can sustain the HER for 1000 cycles while Li intercalated catalyst show an activity fading, possibly due to restacking of the MoS2 layers.
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