Sun Na, Liang Yan, Ma Xujun, Chen Feng
Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P. R. China.
Chemistry. 2017 Nov 2;23(61):15466-15473. doi: 10.1002/chem.201703168. Epub 2017 Oct 6.
A novel g-C N photocatalyst (RCNO) with abundant nitrogen vacancies and oxygen-containing electron-withdrawing groups was prepared. Oxygen was gradually introduced into the g-C N structure by a hydrothermal hydrolysis/condensation process, and nitrogen vacancies were produced with H reduction. The presence of nitrogen vacancies reduced the conduction band energy of g-C N from -0.75 to -0.5 eV and introduced plenty of defect levels in the band gap (just below the conductive band with a width of 0.45 eV). The oxygenation of g-C N induced the formation of oxygen-containing functional groups, such as C=O and C-O, as well as effectively enhancing the separation efficiency of photogenerated carriers and reducing the valence band energy from 2.05 to 2.30 eV. Therefore, the photocatalytic activity and photocurrent responses of RCNO were about nine and eight times higher than that of g-C N , respectively.
制备了一种具有丰富氮空位和含氧基吸电子基团的新型g-CN光催化剂（RCNO）。通过水热水解/缩合过程将氧逐渐引入g-CN结构中，并通过H还原产生氮空位。氮空位的存在将g-CN的导带能量从-0.75降低到-0.5 eV，并在带隙中引入了大量缺陷能级（位于导带下方，宽度为0.45 eV）。g-CN的氧化诱导了含氧基官能团（如C=O和C-O）的形成，并有效提高了光生载流子的分离效率，将价带能量从2.05降低到2.30 eV。因此，RCNO的光催化活性和光电流响应分别比g-CN高约9倍和8倍。
