Highly active titanium oxide photocathode for photoelectrochemical water reduction in alkaline solution

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2022-03-15
Major/Subject
Mcode
Degree programme
Language
en
Pages
8
Series
Journal of Power Sources, Volume 524
Abstract
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 VRHE in 1 M NaOH aqueous solution (pH = 13.6). The photocathode also withstands a voltage @ −1.0 VRHE 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.
Description
Funding Information: Academy of Finland Flagship Programme, Photonics Research and Innovation (PREIN) , No. 320167 ; China Scholarship Council , No. 201706250038 , and No. 201806250102 ; Start-up Package of T10108 Professorship offered by Aalto University to Y.D. Li. Publisher Copyright: © 2022 The Authors
Keywords
Anodic oxidation, Flexible substrate, Hydrogen evolution reaction, Photocathode, Photoelectrochemical water splitting, TiO nanotube
Other note
Citation
Hou , X , Fan , L , Zhao , Y , Lund , P D & Li , Y 2022 , ' Highly active titanium oxide photocathode for photoelectrochemical water reduction in alkaline solution ' , Journal of Power Sources , vol. 524 , 231095 . https://doi.org/10.1016/j.jpowsour.2022.231095