Directional Construction of a 1T0.63-MoSe2@MoP Multiphase-Interface Catalyst for Highly Efficient Alkaline Hydrogen
Chen Li1,2, Wenting Hong1, Qian Cai1
1CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
ACS Applied Materials & Interfaces
|June 28, 2022
Summary
Researchers developed a novel multiphase-interface catalyst (MPIC) for efficient alkaline hydrogen evolution. This advanced catalyst demonstrates excellent performance and stability, paving the way for large-scale hydrogen production from seawater.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Alkaline water electrolysis is crucial for industrial hydrogen production.
- Transition-metal dichalcogenides face limitations in alkaline hydrogen evolution due to poor water adsorption and dissociation kinetics.
- The intrinsic electronic structure of catalysts significantly impacts alkaline hydrogen evolution reaction (HER) efficiency.
Purpose of the Study:
- To design and synthesize a multiphase-interface catalyst (MPIC) to overcome the limitations of traditional electrocatalysts.
- To enhance the intrinsic electronic structure and interfacial properties for improved alkaline HER.
- To evaluate the catalyst's performance and stability in both freshwater and seawater electrolytes.
Main Methods:
- Synthesis of a novel multiphase-interface catalyst: 1T0.63-MoSe2@MoP.
- Electrochemical characterization of the catalyst's performance in alkaline electrolytes.
- Density functional theory (DFT) calculations to understand the electronic structure modifications and catalytic mechanisms.
Main Results:
- The 1T0.63-MoSe2@MoP MPIC achieved a low overpotential of 358 mV at a high current density of 1000 mA cm-2 in alkaline freshwater.
- Demonstrated impressive HER activity and stability in artificial alkaline seawater, indicating potential for practical applications.
- DFT studies confirmed that the synergistic combination of metallic phase and MoP tunes the electronic structure for enhanced HER activity.
Conclusions:
- The developed MPIC effectively tunes the interfacial electronic structure through multiphase synergy, significantly boosting alkaline HER.
- This Mo-based catalyst shows great promise for high-current-density hydrogen evolution, particularly in seawater electrolysis.
- The simple and mature synthesis process offers a viable route for large-scale commercial hydrogen generation.
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