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在可见光谱下增强光催化水分裂的直接Z方案GaN/WSe₂异构结构

Xiaojun Ye¹, Fangfang Zhuang¹, Yuhan Si¹

¹School of Materials Science and Engineering, East China University of Science and Technology Shanghai 200237 China zhangrui118@ecust.edu.cn.

|July 6, 2023

概括

这项研究引入了一种新的GaN/WSe2异构,用于增强光催化. 这种材料具有出色的载体流动性和热力学优势,可在可见光下有效地分裂水.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
光催化作用的光催化

背景情况:

范德瓦尔斯的异构结构为光催化提供了可调节的特性.
控制光生成载体是提高催化效率的关键.

研究的目的:

为了制造和研究一种新的二维GaN/WSe2异构结构.
探索其接口稳定性,电子特性,载体流动性和水分裂的光催化性能.

主要方法:

在WSe2.2上制造单层GaN.
基于密度函数理论 (DFT) 的第一原则计算.
分析电子带结构,电荷转移,载体流动性,以及水分裂的吉布斯自由能量.

主要成果:

GaN/WSe2异构表现出一个直接的Z型带排列,带隙为1.66 eV.
内置的电场促进光生成的电子孔对隔离.
高载体流动性有助于高效的载荷运输.
热力学分析显示,水在没有超电位的情况下分裂成氧气时,有负的吉布斯自由能量变化.

结论:

在可见光下,GaN/WSe2异构结构显示了增强的光催化水分裂.
该材料满足水分的热力学要求.
这项工作为GaN/WSe2异构在光催化中的实际应用提供了理论基础.

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