分解水
异质结
析氧
光催化
氧化还原
催化作用
光催化分解水
吸附
范德瓦尔斯力
带隙
氧气
价(化学)
化学
导带
材料科学
化学物理
光化学
电子
分子
物理化学
光电子学
无机化学
电极
电化学
物理
有机化学
生物化学
量子力学
作者
Chi He,J. H. Zhang,W. X. Zhang,Tian-Tian Li
标识
DOI:10.1021/acs.jpclett.9b00909
摘要
We propose a conceptual design of InSe/g-C3N4 van der Waals heterostructure to achieve highly efficient and spontaneous water splitting. InSe/g-C3N4 possesses a direct band gap of 2.04 eV with type-II band alignment, which is beneficial to the separation of electrons and holes and exhibits proper valence and conduction-band positions for the redox reactions of H2O. In addition, the adsorption of multiple water molecules and the changes of free energy on InSe/g-C3N4 have been calculated to understand the oxygen evolution reaction (OER) process of water splitting. The free energies of reaction on three sides are all downhill, and the values of ΔG reduce to about −0.406 eV, indicating that the OER of water splitting is a thermodynamically permissible reaction without the aid of any other substance. Therefore, the water-splitting reaction could be thermodynamically continued using InSe/g-C3N4 as a photocatalyst, which indicates that InSe/g-C3N4 is an excellent candidate for photocatalyst or photoelectronic applications.
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