Journal
NATURE ENERGY
Volume 2, Issue 6, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nenergy.2017.45
Keywords
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Funding
- US Department of Energy (DOE), Office in Science, Basic Energy Sciences (BES) [DE-SC0008711]
- National Major Research Program of China [2013CB932602]
- Program of Introducing Talents of Discipline to Universities [B14003]
- National Natural Science Foundation of China [51527802, 51232001, 51602020, 51672026]
- Beijing Municipal Science & Technology Commission
- U.S. Department of Energy (DOE) [DE-SC0008711] Funding Source: U.S. Department of Energy (DOE)
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Black silicon (b-Si) is a surface-nanostructured Si with extremely efficient light absorption capability and is therefore of interest for solar energy conversion. However, intense charge recombination and low electrochemical stability limit the use of b-Si in photoelectrochemical solar-fuel production. Here we report that a conformal, ultrathin, amorphous TiO2 film deposited by low-temperature atomic layer deposition (ALD) on top of b-Si can simultaneously address both of these issues. Combined with a Co(OH)(2) thin film as the oxygen evolution catalyst, this b-Si/TiO2/Co(OH)(2) heterostructured photoanode was able to produce a saturated photocurrent density of 32.3mAcm(2) at an external potential of 1.48V versus reversible reference electrode (RHE) in 1M NaOH electrolyte. The enhanced photocurrent relative to planar Si and unprotected b-Si photoelectrodes was attributed to the enhanced charge separation effciency as a result of the effiective passivation of defective sites on the b-Si surface. The 8-nm ALD TiO2 layer extends the operational lifetime of b-Si from less than half an hour to four hours.
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