Abstract
Due to the energy crisis, the development of high-performance photoelectrocatalysts is becoming a hot research area in recent years. Among the materials studied, BiFeO3 (BFO) exhibits excellent photoelectrocatalytic performance due to its moderate bandgap and unique band structure. In this paper, both pure BFO and La-doped BFO were synthesized by solgel method. The average size of the BFO nanoparticles was tuned from 65 to 440 nm. For the La-doped BFO, the average size of the nanoparticles was reduced from 95 to 40 nm with the increase in doping level from 0 to 30%. Next, the photoelectrocatalytic performance of the pure BFO nanoparticles were enhanced with the reduction in nanoparticle size, which was possibly caused by increased surface-to-volume ratio. For the increase in doping of La, the corresponding photoelectrocatalytic performance was first enhanced and then degraded. To understand the obtained results, a mechanism was proposed, which can be attributed to the competition between geometric size effects and surface effects. Our findings provided a controlled way to tune the photoelectrocatalytic performance of BFO system, which is crucial for practical applications.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China under Grant No. 11847012 and by the Innovative and Entrepreneurial Doctor Funding of Jiangsu, China. This work was also supported by the National Natural Science Foundation of China (Grant Nos. 11774417 and 11604381).
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Huang, C., Zhang, X., Zhang, H. et al. Enhanced photoelectrocatalytic performance from size effects in pure and La-doped BiFeO3 nanoparticles. Appl. Phys. A 126, 273 (2020). https://doi.org/10.1007/s00339-020-3459-y
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DOI: https://doi.org/10.1007/s00339-020-3459-y