密度泛函理论
光化学
催化作用
光催化
活化能
材料科学
价(化学)
辐照
X射线光电子能谱
吸附
化学
Atom(片上系统)
物理化学
计算化学
核磁共振
生物化学
物理
有机化学
计算机科学
核物理学
嵌入式系统
作者
Fu-li Sun,Cun‐biao Lin,Wei Zhang,Qing Chen,Wenxian Chen,Xiaonian Li,Guilin Zhuang
标识
DOI:10.1038/s41524-023-01177-3
摘要
Abstract An excellent single-atomic photocatalyst, Ti@C 4 N 3 , is theoretically found to effectively convert CO 2 to C 2 H 6 by density functional theory (DFT) calculations and non-adiabatic molecular dynamics (NAMD) simulations. The Ti@C 4 N 3 photocatalyst has remarkable stability both thermally, chemically, and mechanically. Electronically, it has strong absorption properties ( λ = 327.77 and 529.61 nm), suitable band positions, and a long photogenerated electron lifetime ( τ e = 38.21 ps), allowing photogenerated electrons to migrate to the surface. Notably, the high-valence active site effectively activates two CO 2 through dual activation: Under light irradiation, the weakly adsorbed CO 2 undergoes photo-induced activation by the photoelectron of conduction band minimum (CBM); without light, the high Lewis acidity of the Ti site induces CO 2 activation through back-donating π-bond. Contrast simulation results uncovered that dual activation of CO 2 is attributed to the thermal and photonic synergy. Furthermore, two activated CO 2 species under light easily couple to form oxalate with the barrier of 0.19 eV, and further reduced to C 2 H 6 with a low activation energy of 1.09 eV.
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