Journal article
Confined growth of pyridinic N-Mo2C sites on MXenes for hydrogen evolution
JOURNAL OF MATERIALS CHEMISTRY A, v 8(15), pp 7109-7116
21 Apr 2020
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Developing low-cost and high-performance hydrogen evolution reaction (HER) electrocatalysts is a key research area for scalable hydrogen production from water electrolysis. Here, a hybrid of nitrogen-doped carbon encapsulated Mo2C nanodots on Ti3C2Tx MXene (Mo2C/Ti3C2Tx@NC) is developed through in situ polymerization of dopamine and a Mo precursor on the Ti3C2Tx MXene surface. During the annealing treatment, the polydopamine plays multiple roles in forming N-doped carbon, confining MoO42- ions into ultrasmall Mo2C nanodots, and stabilizing the MXene flakes against spontaneous oxidation. The as-synthesized hybrid exhibits excellent HER activity in acidic electrolyte with an overpotential of 53 mV at 10 mA cm(-2) and excellent stability over 30 hours. The combination of experiments and simulations demonstrates that pyridinic N-doped carbon coated Mo2C nanodots serve as the active sites and Ti3C2Tx MXene facilitates the charge transfer, synergistically contributing to the superior HER performance.
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Details
- Title
- Confined growth of pyridinic N-Mo2C sites on MXenes for hydrogen evolution
- Publication Details
- JOURNAL OF MATERIALS CHEMISTRY A, v 8(15), pp 7109-7116
- Publisher
- ROYAL SOC CHEMISTRY; CAMBRIDGE
- Number of pages
- 0
- Grant note
- This work was financially supported by the AcRF Tier 1 grant (RG105/19) from the Ministry of Education in Singapore and the National Natural Science Foundation of China (U1401248, 11874044). The DFT calculations were supported by TianHe-1(A) at the NSCC in Tianjin. The authors also thank Prof. Yury Gogotsi from Drexel University for helpful comments on the manuscript.
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Drexel University
- Web of Science ID
- WOS:000526936600008
- Scopus ID
- 2-s2.0-85083358248
- Other Identifier
- 991021860680604721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Energy & Fuels
- Materials Science, Multidisciplinary