Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



Nitrogen doping and titanium vacancies synergistically promote CO2 fixation in seawater

Author affiliations

Abstract

The electrocatalytic generation of useful chemicals from CO2, H2O, and sustainable energy resources offers a promising strategy for the carbon cycle. However, the current CO2 electrolysis system is mainly operated in artificial electrolytes (e.g. ionic liquids and inorganic salt solutions), of which the high cost and impractical working conditions hinder its large-scale development. In this case, seawater represents an attractive alternative due to its abundance and good conductivity. Herein, we show that N-doping and titanium vacancies (VTi) can be introduced in Ti3C2 MXene nanosheets via a facile NH3-etching pyrolysis approach. These nanosheets demonstrate impressive CO2 reduction reaction (CO2RR) performances in seawater with a remarkable 92% faradaic efficiency and a partial current density of −16.2 mA cm−2 for CO production, being close to those of noble metal electrodes. Mechanistic studies reveal that the existence of N dopants and VTi synergistically modulates the electronic structure of the active Ti site, on which the free energy barriers for the key *COOH formation and desorption of *CO are greatly reduced, thereby leading to a notable CO2RR improvement. This study provides an opportunity for developing an active and cost-effective CO2 electrolysis system by using seawater as the electrolyte.

Graphical abstract: Nitrogen doping and titanium vacancies synergistically promote CO2 fixation in seawater

Back to tab navigation

Supplementary files

Article information


Submitted
15 May 2020
Accepted
10 Jun 2020
First published
11 Jun 2020

Nanoscale, 2020, Advance Article
Article type
Communication

Nitrogen doping and titanium vacancies synergistically promote CO2 fixation in seawater

D. Qu, X. Peng, Y. Mi, H. Bao, S. Zhao, X. Liu and J. Luo, Nanoscale, 2020, Advance Article , DOI: 10.1039/D0NR03775C

Social activity

Search articles by author

Spotlight

Advertisements