Asymmetric charge distribution boosts hydrogen evolution performance in two-dimensional MoO2/MoS2 step heterostructure

被引:0
作者
Kang, Mengke [1 ]
Zhang, Xiang [1 ]
Wang, Jingyi [2 ,3 ]
Li, Wen [4 ]
Xue, Tianyu [1 ]
Zhai, Kun [1 ]
Xiang, Jianyong [1 ]
Nie, Anmin [1 ]
Cheng, Yingchun [1 ]
Liu, Zhongyuan [1 ]
机构
[1] Yanshan Univ, Ctr High Pressure Sci, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China
[2] Nanjing Tech Univ, Jiangsu Natl Synerget Innovat Ctr Adv Mat, Key Lab Flexible Elect, Nanjing, Peoples R China
[3] Nanjing Tech Univ, Inst Adv Mat, Jiangsu Natl Synerget Innovat Ctr Adv Mat, Nanjing, Peoples R China
[4] IIT, Dept Chem, Chicago, IL USA
基金
中国国家自然科学基金;
关键词
charge distribution; chemical vapor deposition; hydrogen evolution reaction; interface; step heterostructure; MOS2; NANOSHEETS; EFFICIENT; ELECTROCATALYSTS; CATALYST; NICKEL;
D O I
10.1002/cey2.663
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Step heterostructures are predicted to hold a profound catalytic performance because of the rearranged electronic structure at their interface. However, limitations in the morphology of heterostructures prepared by hydrothermal reactions or molten salt-assisted strategies make it challenging to directly assess charge distribution and evaluate a single interface's hydrogen evolution reaction (HER) performance. Here, we prepared two-dimensional MoO2/MoS2 step heterostructures with a large specific surface area by the chemical vapor deposition method. Surface Kelvin probe force microscopy and electrical transport measurement verified the asymmetric charge distribution at a single interface. By fabricating a series of micro on-chip electrocatalytic devices, we investigate the HER performance for a single interface and confirm that the interface is essential for superior catalytic performance. We experimentally confirmed that the enhancement of the HER performance of step heterostructure is attributed to the asymmetric charge distribution at the interface. This work lays a foundation for designing highly efficient catalytic systems based on step heterostructures.
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页数:11
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