Journal
APPLIED PHYSICS LETTERS
Volume 117, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/5.0027906
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Funding
- National Natural Science Foundation of China [51872135, 51572121, 21603098, 21633004]
- Natural Science Foundation of Jiangsu Province [BK20151265, BK20151383, BK20150580]
- Fundamental Research Funds for the Central Universities [021314380133, 021314380084]
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It is highly challenging for coating protective layers on nanoarray photoelectrodes to achieve efficient charge extraction and suppressing corrosion of the electrolyte. Herein, atomic layer deposition was used to deposit a composite overlayer of Al-doped ZnO and TiO2 onto a Ta3N5-Cu2O heterojunction nanoarray photoanode, exhibiting a low onset potential of 0.40V vs reversible hydrogen electrode (RHE), a high photocurrent density of 4.61mAcm(-2) at 1.23V vs RHE, and improved photoelectrochemical (PEC) stability, with the help of CoOOH as a cocatalyst. The improved PEC performances would result from that both the oxide overlayer and the cocatalyst layer contribute to the efficient charge extraction and stopping the electrolyte permeation from/and into the semiconductor, passivating the surface states, and improving the energetics at electrode-electrolyte interface.
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