Confinement of Ionic Liquids at Single-Ni-Sites Boost Electroreduction of CO2 in Aqueous Electrolytes 

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

1 Scopus Citations
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Author(s)

  • Wenhao Ren
  • Xin Tan
  • Xianjue Chen
  • Guobin Zhang
  • Kangning Zhao
  • And 5 others
  • Wanfeng Yang
  • Chen Jia
  • Yong Zhao
  • Sean C. Smith
  • Chuan Zhao

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)13171-13178
Journal / PublicationACS Catalysis
Volume10
Issue number22
Online published29 Oct 2020
Publication statusPublished - 20 Nov 2020

Abstract

The development of strategies to enhance the electrocatalytic properties of single-atom catalysts is highly desirable, yet challenging. Here we show a versatile nanoconfined ionic liquids (ILs) design to tune the interactions between CO2 and single-Ni-site, meanwhile create a solid/liquid interface with high CO2 concentration for efficient CO2 electrocatalysis. The Ni-N catalyst confined with ILs can be directly used with aqueous electrolytes to mitigate the mass transport and conductivity issues typically associated with viscous bulk ILs electrolytes. Density functional theory studies reveal that the d-band center of Ni atoms is positively shifted to the Fermi level in the presence of IL, and consequently the energy barrier of the rate-limiting step of CO2 reduction, CO2(g) → COOH, drops significantly from 1.49 to 0.80 eV. The nanoconfined ILs intensify CO2 conversion by showing a high CO Faradaic efficiency of above 98%, enhanced current densities up to 66.1 mA cm-2, and robust stability over 50 h.

Research Area(s)

  • CO2 reduction, Confinement, Electrocatalysis, Ionic liquids, Ni-N-C

Citation Format(s)

Confinement of Ionic Liquids at Single-Ni-Sites Boost Electroreduction of CO2 in Aqueous Electrolytes . / Ren, Wenhao; Tan, Xin; Chen, Xianjue; Zhang, Guobin; Zhao, Kangning; Yang, Wanfeng; Jia, Chen; Zhao, Yong; Smith, Sean C.; Zhao, Chuan.

In: ACS Catalysis, Vol. 10, No. 22, 20.11.2020, p. 13171-13178.

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