期刊
ACS APPLIED MATERIALS & INTERFACES
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c13897
关键词
bismuth vanadate; NiFe-LDH; Ni; surface charge separation; photoelectrocatalysis
资金
- Natural Science Basic Research Plan in Shaanxi Province of China [2021JM-190]
- State Key Laboratory of Catalysis in DICP [N17-06]
- Fundamental Research Funds for the Central Universities [GK202003039]
In this study, a hierarchical network structure of NF/N/BVO photoanode was successfully constructed, which improved the water oxidation kinetics and charge separation efficiency by introducing a nickel layer and NiFe-LDH nanosheets, resulting in a significantly higher photocurrent density.
BiVO4 with an appropriate band structure is considered to be an ideal candidate for photoanodes. However, slow water oxidation kinetics and low charge separation efficiency seriously restrict its application. To address these issues, an NF/N/BVO photoanode with a hierarchical network structure was successfully constructed by direct-current magnetron sputtering of Ni followed by electrochemical deposition of nickel-iron layered double hydroxide (NiFe-LDH) on BiVO4. A photocurrent density of 4.50 mA/cm2 was obtained for NF/ N/BVO, which was 2.4 times that for pristine BiVO4. The introduction of the Ni layer contributed to the following growth of NiFe-LDH nanosheets with larger size, which acted as active sites and speeded up water oxidation kinetics. Furthermore, surface photovoltage microscopy revealed that Ni and NiFe-LDH acted as the electron collector and hole reservoir, respectively. The co-existence of the two components constituted a highly efficient surface charge separation structure, which was one of the important issues for the excellent water oxidation activity.
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