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Electronically Coupled SnO2 Quantum Dots and Graphene for Efficient Nitrogen Reduction Reaction.

Ke Chu1, Ya-Ping Liu1, Yu-Biao Li1

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|August 20, 2019
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Summary

Tin oxide quantum dots on reduced graphene oxide efficiently catalyze nitrogen reduction reaction (NRR) for ammonia production. This electrocatalyst offers high yield and selectivity under ambient conditions.

Keywords:
N activationSnO quantum dotsdensity functional theoryelectrocatalytic N reduction reactiongraphene hybrid

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrocatalytic nitrogen reduction reaction (NRR) is crucial for sustainable ammonia synthesis.
  • Current NRR methods face challenges with low ammonia yield and Faradaic efficiency (FE).

Purpose of the Study:

  • To develop an efficient and stable electrocatalyst for NRR at ambient conditions.
  • To investigate the catalytic mechanism of SnO2 quantum dots on RGO for NRR.

Main Methods:

  • Synthesis of SnO2 quantum dots (QDs) supported on reduced graphene oxide (RGO).
  • Electrocatalytic performance evaluation using techniques like cyclic voltammetry and chronoamperometry.
  • Density functional theory (DFT) calculations to elucidate the reaction mechanism.

Main Results:

  • SnO2/RGO demonstrated high NH3 yield (25.6 μg h⁻¹ mg⁻¹) and FE (7.1%) at -0.5 V vs RHE.
  • Ultrasmall SnO2 QDs (2 nm) on RGO facilitated N2 adsorption and lowered the rate-determining step's energy barrier.
  • The catalyst exhibited excellent selectivity and stability, with suppressed hydrogen evolution reaction activity.

Conclusions:

  • SnO2/RGO is a promising electrocatalyst for efficient and stable NRR.
  • The electronic coupling between SnO2 QDs and RGO enhances conductivity and catalytic activity.
  • This work provides insights into designing advanced electrocatalysts for artificial nitrogen fixation.