钝化
光电流
量子点
材料科学
异质结
兴奋剂
光电子学
带隙
载流子
分解水
光电化学
制氢
光电化学电池
量子效率
纳米技术
半导体
光电导性
氢
电极
化学
物理化学
光催化
催化作用
有机化学
生物化学
电化学
图层(电子)
作者
Heng Guo,Peng Yang,Jie Hu,Anqiang Jiang,Haiyuan Chen,Xiaobin Niu,Ying Zhou
出处
期刊:ACS omega
[American Chemical Society]
日期:2022-03-09
卷期号:7 (11): 9642-9651
被引量:1
标识
DOI:10.1021/acsomega.1c07045
摘要
The AgInS2 colloidal quantum dot (CQD) is a promising photoanode material with a relatively wide band gap for photoelectrochemical (PEC) solar-driven hydrogen (H2) evolution. However, the unsuitable energy band structure still forms undesired energy barriers and leads to serious charge carrier recombination with low solar to hydrogen conversion efficiency. Here, we propose to use the ZnS shell for defect passivation and Cu ion doping for band structure engineering to design and synthesize a series of Cu x Ag1-x InS2/ZnS CQDs. ZnS shell-assisted defect passivation suppresses charge carrier recombination because of the formation of the core/shell heterojunction interface, enhancing the performance of PEC devices with better charge separation and stability. More importantly, the tunable Cu doping concentration in AgInS2 CQDs leads to the shift of the quantum dot band alignment, which greatly promotes the interfacial charge separation and transfer. As a result, Cu x Ag1-x InS2/ZnS CQD photoanodes for PEC cells exhibit an enhanced photocurrent of 5.8 mA cm-2 at 0.8 V versus the RHE, showing excellent photoelectrocatalytic activity for H2 production with greater chemical-/photostability.
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