Enhanced Electrochemical CO2 Reduction of Cu@CuxO Nanoparticles Decorated on 3D Vertical Graphene with Intrinsic sp3-type Defect

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Zhipeng Ma
  • Constantine Tsounis
  • Priyank V. Kumar
  • Zhaojun Han
  • Roong Jien Wong
  • Cui Ying Toe
  • Shujie Zhou
  • Nicholas M. Bedford
  • Lars Thomsen
  • Rose Amal

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number1910118
Number of pages12
Journal / PublicationAdvanced Functional Materials
Volume30
Issue number24
Online published4 May 2020
Publication statusPublished - 10 Jun 2020

Abstract

Defective 3D vertical graphene (VG) with a relatively large surface area, high defect density, and increased surface electrons is synthesized via a scalable plasma enhanced chemical vapor deposition method, together with a postsynthesis Ar-plasma treatment (VG-Ar). Subsequently, Cu@CuxO nanoparticles are deposited onto VG-Ar (Cu/VG-Ar) through a galvanostatic pulsed electrodeposition method. These Cu@CuxO nanocatalyst systems exhibit a superior electrochemical CO2 reduction performance when compared to Cu-based catalysts supported on commercial graphene paper or pristine VG without postsynthesis Ar-plasma treatment. The Cu/VG-Ar achieves the highest CO2 reduction Faradaic efficiency of 60.6% (83.5% of which are attributed to liquid products, i.e., formate, ethanol, and n-propanol) with a 5.6 mA cm-2 partial current density at -1.2 V versus reversible hydrogen electrode (RHE). The improved CO2 reduction performance of Cu/VG-Ar originates from the well-dispersed Cu@CuxO nanoparticles deposited on the defective VG-Ar. The intrinsic carbon defects on VG-Ar can suppress the hydrogen evolution reaction as well as tune the interaction between VG and Cu@CuxO, thus impeding the excessive oxidation of Cu2O species deposited on VG-Ar. The defective VG-Ar and stabilized Cu@CuxO enhances CO2 adsorption and promotes electron transfer to the adsorbed CO2 and intermediates on the catalyst surface, thus improving the overall CO2 reduction performance.

Research Area(s)

  • Ar plasma treatment, copper nanoparticles, electrochemical CO2 reduction, intrinsic carbon defects, vertical graphene

Citation Format(s)

Enhanced Electrochemical CO2 Reduction of Cu@CuxO Nanoparticles Decorated on 3D Vertical Graphene with Intrinsic sp3-type Defect. / Ma, Zhipeng; Tsounis, Constantine; Kumar, Priyank V.; Han, Zhaojun; Wong, Roong Jien; Toe, Cui Ying; Zhou, Shujie; Bedford, Nicholas M.; Thomsen, Lars; Ng, Yun Hau; Amal, Rose.

In: Advanced Functional Materials, Vol. 30, No. 24, 1910118, 10.06.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review