%0 Journal Article
%T Lewis Basicity of Nitrogen-Doped Graphite Observed by CO2 Chemisorption
%A Hideharu Niwa
%A Hisao Kiuchi
%A Jun Miyawaki
%A Junji Nakamura
%A Maki Kawai
%A Masaharu Oshima
%A Riku Shibuya
%A Takahiro Kondo
%A Yoshihisa Harada
%J Archive of "Nanoscale Research Letters".
%D 2016
%R 10.1186/s11671-016-1344-6
%X The characteristics of CO2 adsorption sites on a nitrogen-doped graphite model system (N-HOPG) were investigated by X-ray photoelectron and absorption spectroscopy and infrared reflection absorption spectroscopy. Adsorbed CO2 was observed lying flat on N-HOPG, stabilized by a charge transfer from the substrate. This demonstrated that Lewis base sites were formed by the incorporation of nitrogen via low-energy nitrogen-ion sputtering. The possible roles of twofold coordinated pyridinic N and threefold coordinated valley N (graphitic N) sites in Lewis base site formation on N-HOPG are discussed. The presence of these nitrogen species focused on the appropriate interaction strength of CO2 indicates the potential to fine-tune the Lewis basicity of carbon-based catalysts
%K CO2 adsorption
%K Nitrogen-doped carbon
%K Lewis basicity
%K X-ray photoelectron spectroscopy
%K X-ray absorption spectroscopy
%K Infrared reflection absorption spectroscopy
%U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4781789/