期刊
APPLIED SURFACE SCIENCE
卷 540, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148387
关键词
Bismuth ferrite; Oxygen evolution reaction; Cr (VI) reduction; Oxygen vacancy
类别
资金
- Ministry of Science and Technology of Taiwan [MOST 108-2113-M-259-004]
This study focused on the synthesis of Ca-doped narrow bandgap BiFeO3 perovskite via a simple auto combustion method, demonstrating its excellent performance in oxygen evolution reactions (OER) and wastewater treatment. By doping Ca2+ into the structure, oxygen vacancies were created and the valence state of Fe3+ was modified. The material showed promising results in the photocatalytic reduction of Cr(VI) and exhibited enhanced electrochemical OER activities in both acidic and alkaline conditions.
The development of perovskite-based materials with a narrow bandgap for oxygen evolution reactions (OER) and wastewater treatment have much attention in recent years. Herein, a narrow bandgap of Ca-doped BiFeO3 (BCFO) is synthesized by a simple auto combustion method. To create oxygen vacancies by doping Ca2+ the place of Bi3+, the amount of Fe3+ valence state is changed as well. 0.15% of Ca doped BiFeO3 (BCFO-15) indicate a high content of Fe4+ state with a conduction band and valence band located at 0.615 V and 2.46 V vs. NHE, respectively. The electrochemical OER of BCFO-15 observed a lower onset potential of 2.13 V vs. RHE, in acidic with a current density of 25.64 mA cm(-2). In alkaline electrolyte, onset potential was observed at 2.10 V vs. RHE, with a current density of 65.87 mA cm(-2). Furthermore, the photocatalytic performance of the perovskites in aqueous solution was demonstrated through photocatalytic reduction of Cr(VI) as a model pollutant, resulting in an 89.92% reduction of 50 ppm of Cr(VI) in 210 min under the irradiation of a 35 W Xe arc lamp. These findings suggest that simple divalent doping of Ca into pure BiFeO3 results in excellent photocatalytic and electrocatalytic perovskites.
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