期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 42, 页码 15906-15914出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c04819
关键词
black phosphorus qttanturti dots; TiO2 nanotube arrays; oxygen vacancies; reactive sites; water splitting
资金
- National Natural Science Foundation of China [51702287]
- Natural Science Foundation of Zhejiang Province [LY15B030007]
Photon absorption, charge separation and transportation, and charge-induced reactions at the active sites are the main crucial factors involved in the photoelectrochemical (PEC) water splitting. Herein, a combination of black phosphorus quantum dot (BPQD) sensitization and defect engineering strategies is employed to optimize the PEC performance of one-dimensional TiO2 nanotube array (NTA) photoanodes. The as-prepared TiO2x/BP electrode exhibits a strong photocurrent density under simulated solar light irradiation, which is almost similar to 3 times higher than that of bare TiO2. Specifically, the photocurrent increment of TiO2x/BP is even larger than the sum of TiO2x and TiO2/BP, verifying the synergistic effect of oxygen vacancies and BPQD sensitization. The maximum photoconversion efficiency of TiO2x/BP is as high as 0.35%, while the value of TiO2 NTAs is calculated to be 0.13%. The results reveal that oxygen vacancies and BPQDs in the TiO2x/BP composite not only facilitate the charge separation and transportation but also enhance the activity and quantity of reactive sites for water oxidation. The present strategy might open new routes to develop high-performance photoelectrodes for water splitting.
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