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Versatile Technique to Produce a Hierarchical Design in Nanoporous Gold
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Disordered Au Nanoclusters for Efficient Ammonia Electrosynthesis.

Xianyun Peng1,2, Rui Zhang3, Yuying Mi4

  • 1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences, Fujian, Fuzhou, 350002, P. R. China.

Chemsuschem
|January 22, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel electrocatalyst using disordered gold nanoclusters on Ti3C2Tx MXene for ammonia synthesis. This catalyst efficiently converts nitrogen to ammonia under mild conditions, offering a greener alternative to traditional methods.

Keywords:
MXenesammoniaelectrocatalysisgoldnanoclusters

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • The Haber-Bosch process for ammonia synthesis is energy-intensive and has high greenhouse gas emissions.
  • Electrochemical nitrogen (N2) reduction reaction (N2RR) offers a sustainable alternative but faces challenges due to the strong N≡N bond.

Purpose of the Study:

  • To explore disordered Au nanoclusters on Ti3C2Tx MXene nanosheets as electrocatalysts for efficient N2RR.
  • To investigate the catalytic mechanism and active sites for N2 activation.

Main Methods:

  • Synthesis of Au nanoclusters anchored on ultrathin Ti3C2Tx MXene nanosheets.
  • Electrochemical measurements for N2RR.
  • In situ near-ambient pressure X-ray photoelectron spectroscopy (XPS).
  • Operando X-ray absorption fine structure (XAFS) spectroscopy.

Main Results:

  • Achieved high ammonia (NH3) yield rate of 88.3±1.7 μg h⁻¹ mg⁻¹.
  • Obtained a Faradaic efficiency of 9.3±0.4% for NH3 production.
  • Identified disordered structure as crucial for N2 chemisorption and activation.

Conclusions:

  • Disordered Au nanoclusters on Ti3C2Tx MXene exhibit exceptional activity and selectivity for N2RR.
  • The catalyst design facilitates N2 activation, paving the way for efficient electrochemical ammonia synthesis.