Fabrication of piezotronic ZnO p-n homojunction via metal/oxygen defects modulation for efficient photoelectrocatalysis

被引:2
|
作者
Chen, Ying [1 ,2 ]
Lin, Minghua [1 ,4 ]
Peng, Zihang [1 ,4 ]
Shu, Yumei [1 ,3 ,4 ]
Ai, Minhua [1 ,3 ,4 ]
Wang, Li [1 ,3 ,4 ]
Zhang, Xiangwen [1 ,3 ,4 ]
Zou, Ji-Jun [1 ,3 ,4 ]
Pan, Lun [1 ,3 ,4 ]
机构
[1] Tianjin Univ, Sch Chem Engn & Technol, Key Lab Green Chem Technol, Minist Educ, Tianjin 300072, Peoples R China
[2] Yantai Univ, Coll Chem & Chem Engn, Shandong Prov Key Lab Chem Engn & Proc, Yantai 264005, Peoples R China
[3] Haihe Lab Sustainable Chem Transformat, Tianjin 300192, Peoples R China
[4] Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China
关键词
ZnO; N-p homojunction; Piezotronic effect; Photoelectrocatalysis; WATER; PROGRESS;
D O I
10.1016/j.ces.2024.120174
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Homojunction is a viable alternative strategy to realize excellent charge separation for enhancing photoelectrocatalytic performance. However, the feasible regulation of the homojunction interface remains challenging. Herein, a ZnO n -p homojunction with the piezotronic effect is constructed via an in -situ solvothermal method for enhancing photoelectrocatalytic activity. ZnO nanorods are transformed from n -type to p -type ZnO nanoparticles with zinc vacancies, leading to the n -p homojunction. The optimal NPZ-36 exhibits a superior photocurrent density of 1.56 mA/cm 2 at 1.23 V vs. RHE and a high incident photon to current conversion efficiency of 75 % at 360 nm. Impressively, with the merits of inherent piezoelectric and photocatalytic properties of wurtzite ZnO, the piezoelectric -enhanced photoelectrochemical activity originates from the simultaneous promotion of bulk charge transfer and interfacial charge separation in ZnO n -p homojunction. The photocurrent density of NPZ-36 -900 can reach to 2.02 mA/cm 2 under the stirring rate of 900 rpm, which is 2.1 times higher than that of pure ZnO photoanode.
引用
收藏
页数:9
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