Journal
JOURNAL OF APPLIED ELECTROCHEMISTRY
Volume 51, Issue 6, Pages 871-878Publisher
SPRINGER
DOI: 10.1007/s10800-021-01542-4
Keywords
Hydrogen evolution; Heterostructures; CoNx-Graphene/MXenes; Density functional theory; Codoped graphene
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Funding
- Project of Integration Platform of Industry & Education of Higher Vocational Education in Jiangsu Province-Artificial Intelligence & Internet of Things (AIoT) (Higher Vocational Education in Jiangsu Province [2019]) [26]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [18KJD140005]
- National Natural Science Foundation of China [11404322]
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The hybrid structures of MXenes and two-dimensional materials exhibit outstanding electrocatalytic performance for hydrogen evolution reaction, showing promise for renewable energy conversion.
Hydrogen evolution reaction (HER) plays a vital role in renewable energy conversion for the development of hydrogen-based energy sources. Lately, heterostructures through hybridizing MXenes with two-dimensional materials have been successfully fabricated and attract much attention due to the exceptional performance as electrodes for Li ion storage and electrocatalysts for HER. Herein, we constructed heterostructures of CoN-graphene (CoN-G, x = 2 and 4) supported by MXenes (Ti) monolayer as highly active electrocatalysts for HER. The theoretical results show that the CoN heterostructure exhibits a high performance for HER with an over-potential (x220;) of only 0.33 V, and the rate-limiting step is determined to be the initial water dissociation process in alkaline media. The outstanding performance of CoN 2is strongly attributed to the interfacial coupling between CoN-G and the MXene substrate. Our finding demonstrates that the sluggish hydrogen evolution process in alkaline media can be facilitated by taking advantage of the fast charge transfer kinetics and interfacial coupling of MXenes.
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