Β-Mo2C/MoO2 heterostructures for hydrogen evolution reaction: Morphology and catalytic activity regulated by heteroatom doping. (6th January 2021)

• Record Type: Journal Article
• Authors: Ruan, Zhuhua; Ni, Jiaqi; Yan, Jing; Zhu, Shufang; Lu, Lilin; Liu, Yi
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 2(2021)
• Page Start: 1517
• Page End: 1525
• Publication Date: 2021-01-06
• Subjects: Molybdenum carbide -- Heteratom doping -- Morphology regulation -- Electrocatalyst -- Hydrogen evolution reaction; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.10.102
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Improving the activity of non-noble metallic electrocatalyst for hydrogen evolution reaction (HER) is an important issue for hydrogen energy utilization. In this work, we reported a new strategy for morphology regulation of β-Mo2 C/MoO2 heterostructure via heteroatom doping to enhance the electrocatalytic HER activity. Electron microscopy observations found that N and S doping resulted in nanosphere and nanorod morphology, respectively. Amongst the S doping catalyst (denoted as S@β-Mo2 C/MoO2 ) exhibited remarkably improved electrocatalytic HER activity and stability as compared to the pristine β-Mo2 C/MoO2 catalyst, whereas the N doping induced significant degradation of catalytic activity and stability. The mechanism investigations reveal that the nanorod morphology of S@β-Mo2 C/MoO2 endows it lower charge transfer resistance, higher electrochemical active surface area and lower valence state of Mo species, which contributes positively and importantly to its better electrocatalytic HER activity. Graphical abstract: Image 1 Highlights: β-Mo2 C/MoO2 heterostructure electrocatalysts for hydrogen evolution reaction (HER). Morphology regulated by heteroatom (N and S) doping. Nanorod and nanosphere morphology. Improved electrocatalytic HER activity of S doping β-Mo2 C/MoO2 catalyst.