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Title: Ultrathin films on copper(i) oxide water splitting photocathodes : a study on performance and stability
Authors: Paracchino, Adriana
Mathews, Nripan
Hisatomi, Takashi
Stefik, Morgan
Tilley, S. David
Grätzel, Michael
Issue Date: 2012
Source: Paracchino, A., Mathews, N., Hisatomi, T., Stefik, M., Tilley, S. D., & Grätzel, M. (2012). Ultrathin films on copper(i) oxide water splitting photocathodes: a study on performance and stability. Energy & Environmental Science, 5(9), 8673-8681.
Series/Report no.: Energy & environmental science
Abstract: The utilisation of Cu2O photocathodes for photoelectrochemical water splitting requires their stabilisation due to photocorrosion in aqueous electrolytes. Ultrathin films of wide band gap semiconducting oxides deposited by atomic layer deposition (ALD) on top of cuprous oxide can perform the dual function of both facilitating charge extraction (through the creation of a p–n junction) and protecting the absorber material from the aqueous electrolyte, thereby suppressing corrosion in favor of hydrogen generation. The factors that determine the photocurrent performance as well as the stability of these photoelectrodes are examined. Specifically, the influence of ALD deposition temperature, electrolyte pH, electrolyte composition as well as post-deposition annealing treatments was studied. The successful development of protective overlayers must fulfil the dual requirements of favourable band alignments as well as chemical stability. At long time scales, the deactivation of the photocathodes proceeds through etching of the amorphous overlayer, accompanied by the loss of the platinum catalyst particles. Through the deposition of a semi-crystalline TiO2 overlayer, 62% stability over 10 hours of testing has been demonstrated without re-platinization.
DOI: 10.1039/c2ee22063f
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles


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