铜
光电阴极
氧化物
空位缺陷
半导体
材料科学
电子结构
带隙
无机化学
光电化学
晶体结构
光电子学
化学
电化学
结晶学
电极
物理化学
冶金
计算化学
电子
物理
量子力学
作者
Ingrid N. Sequeda,Ángel M. Meléndez
标识
DOI:10.1021/acs.jpclett.2c00751
摘要
Controlling the electronic and photoexcited properties of cuprous oxide (Cu2O) through slight modifications of the synthesis method can impact a wide range of emerging technologies. Herein, we consider copper vacancies in Cu2O as a prototype of a p-type oxide semiconductor for studying the impact of crystal and electronic structure on carbon dioxide photoreduction. Oriented films of copper vacancy modulated Cu2O consisting of nano twin structures are electrodeposited by changing the potential in an aqueous alkaline copper(II)-lactate solution. The copper vacancies introduce tail states inside the band gap, improving the hole concentration and facilitating the charge separation and transfer in the Cu2O photocathode. This study gives an in-depth view of how a cation-deficient structure regulates and promotes photoelectrochemical activity toward CO2 reduction.
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