Year: 2024
Type: article
Abstract: Elemental doping is an effective strategy for tuning the band structure of graphite carbon nitride (CN) to enhance its photocatalytic performance.In this study, sodium (Na) and oxygen (O) co-doped carbon nitride (Na/O-CN x , x=1.0, 2.0, 3.0, 4.0) was synthesized via solid-phase reaction of sodium citrate (NaCA) and pure CN powder in the Teflon-sealed autoclave under air conditions at 180 ℃.Surface area of Na/O-CN 3.0 is measured to be 18.8 m 2 /g, increasing by 60.7% compared to that of pure CN (11.7 m 2 /g).Bandgap energy of Na/O-CN 3.0 is determined to be 2.68 eV, marginally lower than that of pure CN (2.70 eV), thereby enhancing its capacity for sunlight absorption.Meanwhile, the incorporation of Na and O atoms into Na/O-CN x is found to effectively reduce recombination rates of photogenerated electron-hole pairs.As a result, Na/O-CN x samples exhibit markedly enhanced photocatalytic hydrogen evolution activity under visible light irradiation.Notably, the optimal Na/O-CN 3.0 sample achieves a photocatalytic hydrogen production rate of 103.2 μmol•g -1 •h -1 , which is 8.2 times greater than that of pure CN (11.2 μmol•g -1 •h -1 ).Furthermore, a series of Na/O-CN x -yO 2 (y=0, 20%, 40%, 60%, 80%, 100%) samples were prepared by modulating the oxygen content within reaction atmosphere.The catalytic performance evaluations reveal that the incorporation of both Na and O atoms in Na/O-CN 3.0 enhances photocatalytic activity.This study also introduces novel methodologies for synthesis of metal atom-doped CN materials at lower temperature, highlighting the synergistic effect of Na and O atoms in photocatalytic hydrogen production of Na/O-CN x samples.
Source: Journal of Inorganic Materials
DOI: 10.15541/jim20240345
Authors: Libo CHEN, Ying SHENG, Ming WU, Jiling SONG, Jian JIAN, Erhong SONG
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: diamond
Award: G3877465985
OpenAlex ID: W4403843291