Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 13, Issue 10, Pages 2356-2364Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c00140
Keywords
-
Categories
Funding
- National Natural Science Foundation of China [51906197]
- Natural Science Foundation of Shaanxi Province [2020JQ040]
- Natural Science Foundation of Jiangsu Province [BK20190220]
- China Postdoctoral Science Foundation [2020M673386, 2020T130503]
- Fundamental Research Funds for the Central Universities
Ask authors/readers for more resources
This study investigates the charge dynamics at the semiconductor-liquid junction in copper bismuth oxide (CBO) photocathodes using various spectroelectrochemical experiments. The results show that the presence of surface states above the valence band of CBO leads to low charge transfer efficiency. This research provides new insights for the optimization of CBO-based photoelectrochemical systems.
Copper bismuth oxide (CBO) is an emerging photocathode in photoelectrochemical (PEC) water splitting but exhibits limited performance due to the severe recombination of photogenerated charges at the semiconductor-liquid junction (SCLJ). For the first time, a set of operational spectroelectrochemical experiments including electrochemical impedance spectroscopy (EIS), transient photocurrent spectroscopy (TPS), and intensity-modulated photocurrent/voltage spectroscopy (IMVS, IMPS) are designed to investigate the charge dynamics at the SCLJ. It is indicated that there are dense surface states above the valence band of CBO, inducing the Fermi level pinning (FLP) effect at the SCLJ. The kinetic parameters speculated by IMVS and IMPS indicate the charge transfer efficiency of below 10% with even a bias of similar to 0.7 V applied. TPS confirms the sluggish dynamics because of the charging behavior of the surface states. It is expected that this work would provide new connotations of charge dynamics at the SCLJ for the further optimization of CBO-based PEC systems.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available