loading page

In-situ facet transformation engineering over Co 3 O 4 for highly efficient electro-reduction of nitrate to ammonia
  • +4
  • Suwei Lu,
  • Yuhang Li,
  • Hongping Yan,
  • Guanting Lin,
  • Tingting Qi,
  • Shijing Liang,
  • Lilong Jiang
Suwei Lu
National Engineering Research Center of Chemical Fertilizer Catalyst
Author Profile
Yuhang Li
National Engineering Research Center of Chemical Fertilizer Catalyst
Author Profile
Hongping Yan
National Engineering Research Center of Chemical Fertilizer Catalyst
Author Profile
Guanting Lin
National Engineering Research Center of Chemical Fertilizer Catalyst
Author Profile
Tingting Qi
National Engineering Research Center of Chemical Fertilizer Catalyst
Author Profile
Shijing Liang
National Engineering Research Center of Chemical Fertilizer Catalyst

Corresponding Author:sjliang2012@fzu.edu.cn

Author Profile
Lilong Jiang
National Engineering Research Center of Chemical Fertilizer Catalyst
Author Profile

Abstract

The catalytic performance on the various exposed facets has a huge difference for electrochemical nitrate reduction reactions (NO 3RR). Herein, we fabricate Co 3O 4 hexagonal nanosheets with various exposed facets, including {112}, {112}&{111}, and {111} facet. The reaction pathways of NO 3RR on various facets are elucidated via in-situ electrochemical characterizations and density functional theory (DFT) investigations. Interestingly, as the dominated facet of Co 3O 4 transform from {112} to {111}, the rate-determining step (RDS) changes from *NO 2→*NO 2H to *NO 3H→*NO 2, and the energy barrier also decreases to 0.48 eV. And {111} facet promotes the hydrogenation of NO x and NH x intermediates. Notably, Co 3O 4-{111} catalyst shows an excellent NO 3RR performance with the NH 3 yield of 5.73 mg mg cat. -1 h -1, which outperforms most of the reported activities.