Journal
NANO CONVERGENCE
Volume 9, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1186/s40580-022-00323-9
Keywords
Photoelectrochemical; Water splitting; Nanostructures; Titanium dioxide; Hydrogen annealing
Funding
- Creative, Material Discovery Program National Research Foundation of Korea - Ministry of Science and ICT [2016M3D1A1027666, 2017M3D1A1040834, 2018M3D1A1058793]
- Basic Research Laboratory Program through an NRF - Korean Ministry of Science, ICT and Future Planning [2021R1A4A302787811]
- KRISS (Korea Research Institute of Standards and Science) MPI Lab. Program
- National Research Foundation of Korea (NRF) - Korea Government MSIT [2021R1C1C2006142]
- Nuclear Energy RD Program [2020M2D8A206983012]
- National Research Foundation of Korea [2021R1C1C2006142] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study reports notable progress in nanostructured TiO2 photoanodes using a facile sequential one-pot hydrothermal synthesis and annealing in hydrogen. The optimized hydrogen annealing significantly improves the performance of TiO2 photoanodes, providing promising methods for eco-friendly mass production of water splitting photoelectrodes.
Dedications to achieve the highly efficient metal oxide semiconductor for the photoelectrochemical water splitting system have been persisted to utilize the TiO2 as the promising photoanode material. Herein, we report notable progress for nanostructured TiO2 photoanodes using facile sequential one-pot hydrothermal synthesis and annealing in hydrogen. A photocurrent density of 3.04 mA center dot cm(-2) at 1.23 V vs. reversible hydrogen electrode was achieved in TiO2 nanorod arrays annealed in hydrogen ambient, which is approximately 4.25 times higher than that of pristine TiO2 annealed in ambient air. 79.2% of incident photon-to-current efficiency at 380 nm wavelength demonstrates the prominence of the material at the near-UV spectral range region and 100 h chronoamperometric test exhibits the stability of the photoanode. Detailed studies regarding crystallinity, bandgap, and elemental analysis provide the importance of the optimized annealing condition for the TiO2-based photoanodes. Water contact angle measurement displays the effect of hydrogen annealing on the hydrophilicity of the material. This study clearly demonstrates the marked improvement using the optimized hydrogen annealing, providing the promising methodologies for eco-friendly mass production of water splitting photoelectrodes.
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