Ultra-small Cu nanoparticles embedded in N-doped carbon arrays for electrocatalytic CO2 reduction reaction in dimethylformamide

Xiaolong Zhang, Ying Zhang, Fengwang Li, Christopher D. Easton, Alan M. Bond, Jie Zhang

Research output: Contribution to journalArticleResearchpeer-review

7 Citations (Scopus)

Abstract

The development of heterogeneous catalysts with a well-defined micro structure to promote their activity and stability for electrocatalytic CO2 reduction has been shown to be a promising strategy. In this work, Cu nanoparticles (~ 4 nm in diameter) embedded in N-doped carbon (Cu@NC) arrays were fabricated by thermal decomposition of copper tetracyanoquinodimethane (CuTCNQ) under N2. Compared to polycrystalline copper electrodes, the Cu@NC arrays provide a significantly improved number of catalytically active sites. This resulted in a 0.7 V positive shift in onset potential, producing a catalytic current density an order magnitude larger at a potential of–2.7 V vs. Fc/Fc+ (Fc = ferrocene) in dimethylformamide (DMF). By controlling the water content in the DMF solvent, the CO2 reduction product distribution can be tuned. Under optimal conditions (0.5 vol% water), 64% HCOO, 20% CO, and 13% H2 were obtained. The Cu@NC arrays exhibited excellent catalytic stability with only a 0.5% decrease in the steady-state catalytic current during 6 h of electrolysis. The three-dimensional (3D) array structure of the Cu@NC was demonstrated to be effective for improving the catalytic activity of copper based catalysts while maintaining long-term catalytic stability.

Original languageEnglish
Pages (from-to)3678-3690
Number of pages13
JournalNano Research
Volume11
Issue number7
DOIs
Publication statusPublished - Jul 2018

Keywords

  • carbon arrays
  • CO reduction
  • copper
  • copper tetracyanoquinodimethane (CuTCNQ)
  • electrocatalysis

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