期刊
RENEWABLE ENERGY
卷 189, 期 -, 页码 694-703出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2022.03.025
关键词
Hematite photoanode; Microwave irradiation; Ex-situ doping; Zirconium ion; Photoelectrochemical water splitting
资金
- Climate Change Response Project [NRF-2019M1A2A2065612, NRF-2018R1A2A1A05077909]
- Korea-China Key Joint Research Program [2017K2A9A2A11070341]
- Ministry of Sci-ence and ICT (MSIT) [1.190013.01]
- UNIST, South Korea
- MSIT, South Korea
Ex-situ doping of hematite films is achieved through microwave-assisted metal ions attachment and high temperature annealing, resulting in a Zr4-doped Fe2O3/FTO photoanode with enhanced photoelectrochemical activity.
Ex-situ doping into hematite films is carried out via a short-duration (-60 s) microwave-assisted metalions attachment (MWMA) of tetravalent Zr4 thorn ion on the surface of FeOOH/FTO, followed by high temperature annealing (HTA) to fabricate Zr4 thorn :Fe2O3/FTO photoanode for photoelectrochemical (PEC) water splitting. Compared to a simple dipping attachment without microwave irradiation, this MWMA allows a much larger amount of attached Zr4 thorn -ions on the FeOOH precursor, leading to a properly doped photoanode of much higher PEC activity. The primary effect of Zr4 thorn doping is to improve the charge transport characteristics in the bulk of hematite. In addition, it also boosts charge injection efficiency at the semiconductor and electrolyte interface by forming an inadvertent passivation layer and promoting hole transfer via surface states. As a result, the Zr4 thorn :Fe2O3/FTO photoanode shows a higher photocurrent density of 1.54 mA cm-2 at 1.23 VRHE under 1 Sun irradiation relative to undoped Fe2O3/FTO (1.02 mA cm-2) or Zr4 thorn :Fe2O3/FTO (1.19 mA cm-2) prepared without MWMA. (c) 2022 Elsevier Ltd. All rights reserved.
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