Theoretical investigation of CO2 and NO2 adsorption onto Co-, Rh- and Ir-doped (5,5) single-walled carbon nanotubes

► Binding of Co, Rh and Ir atoms on single-walled carbon nanotubes (SWCNTs). ► Adsorption of CO2 and NO2 on pristine, Co-, Rh-and Ir-doped SWCNTs. ► Ir-doped SWCNT is the best NO2 storage. ► Co-doped SWCNT and Rh-doped SWCNT can be used as NO2 storage.