Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 257, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.117900
Keywords
Hematite; Nanotube arrays; High-temperature; High aspect ratio; Water oxidation
Funding
- National Natural Science Foundation of China [21832005, 21573264, 21622310, 21603247and21703266]
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Hematite (alpha-Fe2O3) nanotube arrays with high aspect ratio and well-defined crystalline structures are highly attractive for photoelectrochemical water splitting. However, their design and fabrication remain a great challenge resulted from the poor thermal stability. Herein, we demonstrate that the high-crystalline Fe2O3 nanotube arrays with average length of 2 mu m and high density of 2.5 x 10(7) tubes/cm(2) could survive extended calcination temperatures up to similar to 800 degrees C without any sintering. Owing to the well-oriented tubular structure, high light absorption and rich surface defects, this Fe2O3 nanotube photoanode exhibits a significantly improved PEC activity for water oxidation, and the photocurrent could be achieved up to 1.2 mA cm(-2) at 1.23 V (vs. reversible hydrogen electrode, RHE). The decoration of FeOOH/NiOOH dual-cocatalysts not only caused a negative shift on onset-potential (170 mV), but also increased the photocurrent density up to 2.0 mA cm(-2) (1.23 V-RHE), which is the highest value among the reported hematite nanotube photoanodes.
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