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Defect-Induced Ce-Doped Bi2WO6 for Efficient Electrocatalytic N2 Reduction.

Xuetao Yang1, Yanfang Ma1, Yang Liu1

  • 1School of Chemistry and Chemical Engineering, Central South University, Changsha 410083 China.

ACS Applied Materials & Interfaces
|April 21, 2021
PubMed
Summary

This study introduces cerium-doped Bi2WO6 nanoflowers for electrochemical ammonia synthesis. The optimized catalyst enhances nitrogen reduction reaction (NRR) performance by introducing crystal defects, overcoming challenges in ammonia production.

Keywords:
Bi2WO6Ce dopingN2 reduction reactioncrystal defectselectrocatalysis

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrochemical nitrogen reduction reaction (NRR) offers a sustainable route to ammonia (NH3) synthesis.
  • Challenges include the strong N≡N bond and competing hydrogen evolution reaction (HER), limiting NH3 yielding rate and Faradaic efficiency (FE).
  • Bi-based and W-based catalysts show promise due to reduced HER activity.

Purpose of the Study:

  • To develop a novel electrocatalyst for enhanced NRR.
  • To investigate the effect of cerium (Ce) doping on Bi2WO6 nanoflowers for NRR.
  • To improve N2 activation and ammonia synthesis efficiency.

Main Methods:

  • Synthesized Ce-doped Bi2WO6 nanoflowers (xCe-Bi2WO6) with varying Ce content.
  • Evaluated electrocatalytic performance for NRR in aqueous solutions.
  • Utilized density functional theory (DFT) calculations to understand N2 activation mechanisms.

Main Results:

  • 10%Ce-Bi2WO6 demonstrated a high NH3 yielding rate (22.5 μg h−1 mg−1cat.) and FE (15.9%) at -0.20 V vs RHE.
  • The doped catalyst exhibited excellent electrochemical and structural durability.
  • DFT calculations confirmed that crystal defects enhance N2 adsorption and activation.

Conclusions:

  • Ce-doped Bi2WO6 is a highly effective electrocatalyst for NRR.
  • Introducing crystal defects via Ce doping significantly boosts NRR activity.
  • This approach offers a promising strategy for efficient electrochemical ammonia production.