异质结
光催化
光催化分解水
分解水
材料科学
密度泛函理论
带隙
有效质量(弹簧-质量系统)
单层
范德瓦尔斯力
电子能带结构
吸收(声学)
光电子学
化学物理
化学
纳米技术
凝聚态物理
计算化学
催化作用
分子
物理
生物化学
有机化学
量子力学
复合材料
作者
Lin Li,Yang Hua,Ping Yang
标识
DOI:10.1016/j.jcis.2023.07.091
摘要
Addressing the energy crisis and environmental pollution necessitates efficient photocatalysts for hydrogen production via water hydrolysis. This study uncovers the potential of a novel photocatalyst - two-dimensional transition metal dichalcogenides (TMDs) heterojunction. Using density functional theory (DFT), we examined the photocatalytic performance of the two-dimensional WS2/MoSe2 heterojunctions for water splitting. Our findings reveal a direct band gap of 1.65 eV and a type II band structure in the heterojunction. This structure facilitates the separation of electrons and holes in the WS2 and MoSe2 monolayers, thereby significantly inhibiting electron-hole recombination. Furthermore, high optical absorption coefficient (105 cm − 1), small effective mass of electron(hole), low interlayer barrier, and adjustable band-edge stress in the heterostructure collectively enhance photocatalytic efficiency.
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