Journal
LANGMUIR
Volume 37, Issue 21, Pages 6490-6497Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.1c00638
Keywords
-
Funding
- Fundamental Research Funds for the Central Universities [2652019031]
Ask authors/readers for more resources
This study presents an effective strategy for improving PEC performance by fabricating a WO3 photoanode rich in oxygen vacancies modified by NiFe-based LDH. The synergistic effect of NiFe-LDH and Ov significantly enhances the photocurrent density, leading to improved charge separation and transport.
Photoelectrochemical (PEC) water splitting serves as one of the promising approaches for producing clean and renewable energy, and their solar-hydrogen energy conversion efficiency depends on the interfacial charge separation and carrier mobility. Herein, we report an effective strategy to promote the PEC performance by fabricating a WO3 photoanode rich in oxygen vacancies (Ov) modified by NiFe-based layered double hydroxide (LDH). When WO3-Ov/NiFe-LDH is used as a photoanode, the maximum photocurrent density at 1.8 V versus RHE has been significantly enhanced to 2.58 mA.cm(-2), which is 4.3 times higher than that of WO3. In addition, analogues were studied in controlled experiments without Ov, which further demonstrated that the synergistic effect of NiFe-LDH and Ov resulted in increased carrier concentration and driving force. According to electrical impedance spectroscopy, X-ray photoelectron spectroscopy, and Mott-Schottky analysis, the built-in electronic field in WO3 homojunction, along with the accelerated hole capture by the NiFeLDH cocatalyst contributes to the improved charge separation and transport in the WO3-Ov/NiFe-LDH electrode. This work proposes an efficient and valuable strategy for designing the structure of WO3-based photoelectrodes.
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