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TiO2-Mo2C Heterostructure for Enhanced Electrocatalytic Nitrogen Reduction to Ammonia.

Junmei Wang1, Qingkun Tian2, Li Chen1

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This study introduces a novel TiO2-Mo2C heterostructure catalyst for electrochemical nitrogen reduction reaction (NRR). The catalyst enhances nitrogen adsorption and activation, offering a promising pathway for efficient ammonia synthesis.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient electrocatalysts for the nitrogen reduction reaction (NRR) is critical for sustainable ammonia synthesis.
  • Molybdenum carbide (Mo2C) shows potential for NRR but suffers from poor N2 adsorption/activation and hydrogen evolution competition.
  • Heterostructure catalysts offer a strategy to overcome limitations of single-component materials.

Purpose of the Study:

  • To investigate the potential of TiO2-Mo2C heterostructures as electrocatalysts for the electrochemical nitrogen reduction reaction (NRR).
  • To elucidate the mechanism of enhanced N2 adsorption and activation in the TiO2-Mo2C system.
  • To provide theoretical guidance for designing advanced NRR electrocatalysts.

Main Methods:

  • First-principles theoretical calculations were employed to study the electronic and catalytic properties of the TiO2-Mo2C heterostructure.
  • Analysis of orbital interactions (Mo 4d and N2 2p*) and electronic structure (integrated crystal orbital Hamilton population) was performed.
  • Thermodynamic calculations of Gibbs free energy for N2 adsorption versus hydrogen evolution were conducted.
  • The catalytic mechanism for N2 reduction to NH3 was investigated, comparing associative distal and alternating pathways.

Main Results:

  • The TiO2-Mo2C heterostructure demonstrates significantly enhanced N2 adsorption and activation compared to Mo2C alone.
  • Increased interaction between Mo 4d and N2 2p* orbitals, facilitated by TiO2, is responsible for improved N2 activation.
  • Theoretical calculations show a preference for N2 adsorption over hydrogen evolution.
  • The associative distal pathway was identified as the dominant mechanism for N2 conversion to NH3 on the TiO2-Mo2C surface.

Conclusions:

  • The TiO2-Mo2C heterostructure exhibits unique advantages for the electrochemical nitrogen reduction reaction.
  • This heterostructure design effectively enhances N2 adsorption and activation, crucial for efficient NRR.
  • The findings provide valuable theoretical insights for the development of next-generation NRR electrocatalysts.