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Nickel Single Atom Density-Dependent CO2 Efficient Electroreduction.

Fengwei Zhang1, Han Zhang1, Zhenhe Jia2

  • 1Institute of Crystalline Materials, Institute of Molecular Science, Key Lab of Materials for Energy Conversion and Storage of Shanxi Province, School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|November 30, 2023
PubMed
Summary
This summary is machine-generated.

The density of nickel single atoms significantly impacts carbon dioxide electroreduction (CO2RR) performance in M-N-C catalysts. Optimizing this density is key to enhancing the efficiency of producing valuable C1 products from CO2.

Keywords:
CO2 electroreductionNiN4 active siteN‐doped graphene‐like carbonprecise regulationsingle atom density

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Transition metal-nitrogen-carbon (M-N-C) materials with M-N-x sites show promise for CO2 electroreduction (CO2RR).
  • A clear understanding of how metal single-atom density affects CO2RR performance is needed.

Purpose of the Study:

  • To investigate the relationship between nickel single-atom density and CO2RR performance.
  • To design and synthesize Ni single-atom catalysts (SACs) on N-doped carbon supports.

Main Methods:

  • Fabrication of Ni SACs on N-doped graphene-like carbon (Ni1@NG-900) with varying Ni loadings.
  • Tuning the density of Ni single atoms (DNi) from 0.01 to 1.19 atoms nm-2.
  • Electrochemical evaluation of CO2RR performance, including Faradaic efficiency for CO (FE_CO).

Main Results:

  • FE_CO increased from 13.4% to 96.2% as DNi rose from 0 to 0.068 atoms nm-2.
  • Further increases in DNi (up to 1.19 atoms nm-2) resulted in a marginal FE_CO improvement to 98.2%.
  • Theoretical calculations supported the experimental findings, revealing a trade-off relationship.

Conclusions:

  • The density of Ni single atoms is a critical factor influencing CO2RR performance in M-N-C catalysts.
  • Optimizing DNi is essential for maximizing the efficiency of CO2RR for C1 product synthesis.
  • This study provides insights into rational catalyst design for improved CO2 electroreduction.