期刊
APPLIED SURFACE SCIENCE
卷 585, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2022.152650
关键词
Solar hydrogen production; Photocatalytic hydrogen evolution; Upconversion luminescent materials; S-scheme heterojunction; Internal electric field
类别
资金
- National Natural Science Foundation of China [11504242, 51602353]
- Project of Guangdong Provincial Education [2020KTSCX131]
- Guangdong Basic and Applied Basic Research Foundation [2020B1515120006]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Gaoyuan Discipline of Shanghai-Environmental Science and Engineering (Resource Recycling Science and Engineering)
In this study, photocathodes were fabricated by embedding beta-NaGdF4: Yb3+, Er3+ nanocrystals and BiVO4 microcrystals into Cu2O matrix. The NaGdF4:Yb3+, Er3+/BiVO4 embedded Cu2O photocathodes showed good response to near infrared light and significantly enhanced photocurrent compared to the pristine Cu2O thin film.
Upconverting near infrared light to photoelectrode absorbable visible light is desirable for enhancing photo electrochemical hydrogen production. In this work, photocathodes were fabricated by embedding beta-NaGdF4: Yb3+,Er3+ nanocrystals and BiVO4 microcrystals into Cu2O matrix, where beta-NaGdF4:Yb3+, Er3+ nanocrystals were used for upconversion luminescence and the BiVO4 microcrystals were employed to form abundant heterojunctions inside the Cu2O matrix. In comparison with the pristine Cu2O thin film, the NaGdF4:Yb3+,Er3+/BiVO4 embedded Cu2O photocathodes illustrated good response to near infrared light. Photocurrent produced by 980 nm light was enhanced by a factor of 40 to about 1 mA cm(-2). The high photocurrent can be attributed to the widely distributed internal electric fields introduced by the BiVO4 in the bulk of the Cu2O, which inhibits the recombination of the electrons and holes excited by the NaGdF4:Yb3+,Er3+ emitted visible light in the vicinity. Furthermore, the 980 nm light induced temperature increment exhibits significant synergistic effect on the enhanced photocurrent.
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