Journal
JOURNAL OF POWER SOURCES
Volume 524, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231095
Keywords
TiO2 nanotube; Anodic oxidation; Photocathode; Photoelectrochemical water splitting; Hydrogen evolution reaction; Flexible substrate
Funding
- Academy of Finland Flagship Programme, Photonics Research and Innovation (PREIN) [320167]
- China Scholarship Council [201706250038, 201806250102]
- Aalto University
- [T10108]
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This study successfully achieved a highly active and stable photo cathode for hydrogen evolution reaction (HER) through stepwise cathodic reduction of anodic titanium dioxide nanotube without loading any cocatalyst, demonstrating good electrochemical performance in aqueous solution.
Developing low-cost, efficient and stable metal oxide cathode catalyst for hydrogen evolution reaction (HER) is of great importance to overcome the major challenge in photoelectrochemical water splitting (PECWS) cell. Anodic titanium dioxide nanotube (TNT) as the electrode has shown promising for its flexibility, economy and efficiency. Herein, a highly active and stable photocathode for HER was achieved with a technique of stepwise cathodic reduction of anodic TNT without loading any cocatalyst. It exhibits a self-improving PECWS performance after the five-step cathodic reduction process. The onset voltage displays an anodic shift from-0.79 to 0.19 V versus the reversible hydrogen electrode (RHE) and the overall current shows an enhancement from-110.06 to-210.66 mA at-1.0 V-RHE in 1 M NaOH aqueous solution (pH = 13.6). The photocathode also withstands a voltage @-1.0 V-RHE and a current @-100 mA in the WS cell for more than 12,000 s sequentially. This work demonstrates a feasible strategy for forming a multijunction composite for efficient HER with the anodic TNT as the precursor.
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