同质结
材料科学
光电流
分解水
纳米棒
光电子学
纳米技术
化学工程
分析化学(期刊)
光催化
催化作用
兴奋剂
色谱法
生物化学
工程类
化学
作者
Kai Shen,Gang Li,Zhichao Yu,Xin Wang,Yan Li,Congwei Wang,Kaiying Wang
标识
DOI:10.1016/j.surfin.2023.102989
摘要
The photoelectrochemical (PEC) water splitting, which employs catalytic semiconductors to convert solar energy into hydrogen, is a promising approach for achieving securer and sustainable energy supply. Nanostructured ZnO have exhibited excellent PEC properties but the bottlenecks of limited visible-light response and poor electron-hole separation hindered their applications. In this work, nitrogen ions were injected into dense ZnO nanoarrays, which was hydrothermally grown on Au-NPs sputtered ITO substrate. The injected nitrogen preferably occupied oxygen vacancies in pristine ZnO, leading to the in-sit transition of p-ZnO and formation of p-n homojunctions. Benefiting from the surface plasmon resonance effect of Au and the internal electric field (IEF) of p-n homojunctions, full-spectrum light absorption and effective cross-interface carrier separation was achieved. The photocurrent density and hydrogen production rate of injected photoelectrode reaches 2.38 mA cm−2 and 4.56 mM cm−2 h−1, which is 21.64 and 7.35 times higher than that of pure-ZnO respectively. This PEC enhancement was attributed to the uniformly sputtered Au coupled with ZnO p-n homojunctions, which synergistically boosted light harvesting efficiency and suppress carrier recombination. This work contributes to the rational design of PEC photoelectrode via combining full-spectrum light absorption promoter with p-n homojunction induced IEF to harvest solar energy into chemical forms.
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