Electrocatalytically switchable CO2 capture: first principle computational exploration of carbon nanotubes with pyridinic nitrogen.
Carbon nanotubes with specific nitrogen doping are proposed for controllable, highly selective, and reversible CO2 capture. Using density functional theory incorporating long-range dispersion corrections, we investigated the adsorption behavior of CO2 on (7,7) single-walled carbon nanotubes (CNTs) with several nitrogen doping configurations and varying charge states. Pyridinic-nitrogen incorporation in CNTs is found to induce an increasing CO2 adsorption strength with electron injecting, leading to a highly selective CO2 adsorption in comparison with N2 . This functionality could induce intrinsically reversible CO2 adsorption as capture/release can be controlled by switching the charge carrying state of the system on/off. This phenomenon is verified for a number of different models and theoretical methods, with clear ramifications for the possibility of implementation with a broader class of graphene-based materials. A scheme for the implementation of this remarkable reversible electrocatalytic CO2 -capture phenomenon is considered.
School of Chemical Engineering, the University of Queensland, QLD 4072, Brisbane (Australia); Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, QLD 4072, Brisbane (Australia); Current address: School of Chemical Engineering the University of Adelaide, SA 5005 (Australia).
Yan
Y
Jiao
Yao
Y
Zheng
Sean C
SC
Smith
Aijun
A
Du
Zhonghua
Z
Zhu
D000327:Adsorption; D002245:Carbon Dioxide / Q000737:chemistry*; D003198:Computer Simulation; D003246:Conservation of Energy Resources; D004563:Electrochemistry; D008958:Models, Molecular; D008968:Molecular Conformation; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*
D037742:Nanotubes, Carbon; D011725:Pyridines; D002245:Carbon Dioxide; D009584:Nitrogen; C023666:pyridine
co2 capture; density functional theory; nanocarbon functionalization; nanostructures; nanotubes