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MoC/MAPbI3 hybrid composites for efficient photocatalytic hydrogen evolution.

Tiantian Zhang1, Jianfei Yu1, Jiyao Huang1

  • 1School of Chemistry and Chemical Engineering, Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and device, Southeast University, Nanjing 211189, PR China. chenjinxi@seu.edu.cn.

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|July 23, 2021
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A new molybdenum carbide (MoC)/methylamine lead iodide (MAPbI3) composite shows significantly enhanced photocatalytic hydrogen production. This MoC/MAPbI3 material achieved a 24-fold increase in hydrogen evolution compared to pure MAPbI3.

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Renewable Energy

Background:

  • Metal halide perovskites, like methylamine lead iodide (MAPbI3), are promising for photocatalysis due to their optoelectronic properties.
  • Efficient hydrogen evolution via photocatalytic decomposition of hydroiodic acid (HI) is crucial for sustainable hydrogen production.
  • Pure MAPbI3 exhibits limited efficiency in photocatalytic hydrogen evolution.

Purpose of the Study:

  • To synthesize and evaluate a novel MoC/MAPbI3 composite for enhanced photocatalytic hydrogen evolution.
  • To investigate the effect of molybdenum carbide (MoC) as a non-precious metal promoter on MAPbI3 performance.
  • To assess the stability and efficiency of the composite catalyst under visible light.

Main Methods:

  • Synthesis of a MoC/MAPbI3 composite material.
  • Evaluation of photocatalytic hydrogen production rates using the synthesized materials.
  • Testing of catalyst stability through multiple 4-hour cycle tests under visible light.

Main Results:

  • The 15 wt% MoC/MAPbI3 composite demonstrated superior hydrogen production, reaching 38.4 μmol h⁻¹, a 24-fold improvement over pure MAPbI3 (1.61 μmol h⁻¹).
  • Extended catalytic testing showed a sustained high hydrogen evolution rate of 165.3 μmol h⁻¹ for MoC/MAPbI3 after 16 hours.
  • The MoC/MAPbI3 composite exhibited excellent cycling stability without performance degradation over multiple 4-hour test cycles.

Conclusions:

  • The incorporation of MoC significantly enhances the photocatalytic activity of MAPbI3 for hydrogen evolution.
  • Effective charge carrier separation and transfer between MoC and MAPbI3 contribute to the improved performance.
  • This study presents a novel and efficient MAPbI3-based composite catalyst for hydrogen production, utilizing a non-precious metal promoter.