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Silicon protected with atomic layer deposited TiO2: durability studies of photocathodic H2 evolution


Seger, B; Tilley, David S; Pedersen, Thomas; Vesborg, P C K; Hansen, Ole; Grätzel, Michael; Chorkendorff, Ib (2013). Silicon protected with atomic layer deposited TiO2: durability studies of photocathodic H2 evolution. RSC Advances, 3(48):25902-25907.

Abstract

The semiconducting materials used for photoelectrochemical (PEC) water splitting must withstand the corrosive nature of the aqueous electrolyte over long time scales in order to be a viable option for large scale solar energy conversion. Here we demonstrate that atomic layer deposited titanium dioxide (TiO2) overlayers on silicon-based photocathodes generate extremely stable electrodes. These electrodes can produce an onset potential of +0.510 V vs. RHE and a hydrogen evolution saturation current of 22 mA cm−2 using the red part of the AM1.5 solar spectrum (λ > 635 nm, 38.6 mW cm−2). A PEC chronoamperometry experiment was carried out for 2 weeks under constant illumination at +0.300 V vs. RHE with negligible degradation (<5%). Further testing showed slight degradation, but the re-addition of catalyst recovered the activity. These results show that properly processed TiO2 overlayers may have the potential to be stable for the long time frames that will be necessary for commercial devices.

Abstract

The semiconducting materials used for photoelectrochemical (PEC) water splitting must withstand the corrosive nature of the aqueous electrolyte over long time scales in order to be a viable option for large scale solar energy conversion. Here we demonstrate that atomic layer deposited titanium dioxide (TiO2) overlayers on silicon-based photocathodes generate extremely stable electrodes. These electrodes can produce an onset potential of +0.510 V vs. RHE and a hydrogen evolution saturation current of 22 mA cm−2 using the red part of the AM1.5 solar spectrum (λ > 635 nm, 38.6 mW cm−2). A PEC chronoamperometry experiment was carried out for 2 weeks under constant illumination at +0.300 V vs. RHE with negligible degradation (<5%). Further testing showed slight degradation, but the re-addition of catalyst recovered the activity. These results show that properly processed TiO2 overlayers may have the potential to be stable for the long time frames that will be necessary for commercial devices.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > General Chemistry
Physical Sciences > General Chemical Engineering
Language:English
Date:2013
Deposited On:28 May 2015 07:00
Last Modified:02 Sep 2021 14:55
Publisher:RSC Publishing
ISSN:2046-2069
OA Status:Closed
Publisher DOI:https://doi.org/10.1039/c3ra45966g

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