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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Synergistic Doping and Intercalation: Realizing Deep Phase Modulation on MoS2 Arrays for High-Efficiency Hydrogen
Shengjue Deng1, Mi Luo2, Changzhi Ai3
1State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
Angewandte Chemie (International Ed. in English)
|September 6, 2019
Summary
A novel synergistic strategy using nitrogen doping and phosphate intercalation significantly enhances the conversion of 2H-MoS2 to 1T-MoS2, boosting hydrogen evolution reaction (HER) performance.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Molybdenum disulfide (MoS2) exists in multiple phases, with the 1T phase exhibiting superior catalytic properties compared to the 2H phase.
- Achieving high-phase conversion from 2H-MoS2 to 1T-MoS2 is crucial for developing efficient electrocatalysts.
- Existing doping or intercalation methods show limited success in promoting this phase transformation.
Purpose of the Study:
- To develop a synergistic strategy for high-yield phase conversion of MoS2.
- To investigate the mechanism behind the synergistic phase transformation.
- To fabricate and evaluate binder-free MoS2-based electrodes for enhanced hydrogen evolution reaction (HER) performance.
Main Methods:
- Synergistic nitrogen doping and phosphate (PO43-) intercalation into 2H-MoS2.
- Phase transformation analysis using synchrotron radiation and spherical aberration transmission electron microscopy (TEM).
- Fabrication of binder-free (N,PO43-)-MoS2 nanosheet arrays on a vertical graphene (VG) skeleton.
- Electrochemical evaluation of HER performance, including Tafel slope and overpotential measurements.
Main Results:
- The synergistic strategy achieved a high conversion rate of 2H-MoS2 to 1T-MoS2 (approx. 41%), significantly outperforming single N doping (approx. 28%) or PO43- intercalation (approx. 10%).
- A scattering mechanism was proposed and confirmed to explain the synergistic phase transformation.
- The resulting (N,PO43-)-MoS2/VG electrode exhibited excellent HER activity, characterized by a lower Tafel slope and overpotential compared to control samples and other Mo-based catalysts.
Conclusions:
- Synergistic N doping and PO43- intercalation is an effective strategy for inducing high-yield 1T-MoS2 phase conversion.
- The (N,PO43-)-MoS2/VG electrode demonstrates superior HER performance due to optimized electronic structure and reduced hydrogen adsorption/desorption energy.
- This approach offers a promising pathway for designing advanced electrocatalysts for clean energy applications like hydrogen production.
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