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Releasing the bubbles : nanotopographical electrocatalyst design for efficient photoelectrochemical hydrogen production in microgravity environment
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Akay, Ömer, Poon, Jeffrey, Robertson, Craig, Abdi, Fatwa Firdaus, Cuenya, Beatriz Roldan, Giersig, Michael and Brinkert, Katharina (2022) Releasing the bubbles : nanotopographical electrocatalyst design for efficient photoelectrochemical hydrogen production in microgravity environment. Advanced Science . 2105380. doi:10.1002/advs.202105380
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WRAP-Releasing-bubbles-nanotopographical-electrocatalyst-design-efficient-2022.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (1867Kb) | Preview |
Official URL: https://doi.org/10.1002/advs.202105380
Abstract
Photoelectrochemical devices integrate the processes of light absorption, charge separation, and catalysis for chemical synthesis. The monolithic design is interesting for space applications, where weight and volume constraints predominate. Hindered gas bubble desorption and the lack of macroconvection processes in reduced gravitation, however, limit its application in space. Physico‐chemical modifications of the electrode surface are required to induce gas bubble desorption and ensure continuous device operation. A detailed investigation of the electrocatalyst nanostructure design for light‐assisted hydrogen production in microgravity environment is described. p‐InP coated with a rhodium (Rh) electrocatalyst layer fabricated by shadow nanosphere lithography is used as a model device. Rh is deposited via physical vapor deposition (PVD) or photoelectrodeposition through a mask of polystyrene (PS) particles. It is observed that the PS sphere size and electrocatalyst deposition technique alter the electrode surface wettability significantly, controlling hydrogen gas bubble detachment and photocurrent–voltage characteristics. The highest, most stable current density of 37.8 mA cm−2 is achieved by depositing Rh via PVD through 784 nm sized PS particles. The increased hydrophilicity of the photoelectrode results in small gas bubble contact angles and weak frictional forces at the solid–gas interface which cause enhanced gas bubble detachment and enhanced device efficiency.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | |||||||||
| SWORD Depositor: | Library Publications Router | |||||||||
| Library of Congress Subject Headings (LCSH): | Photoelectrochemistry, Hydrogen evolution reaction , Reduced gravity environments , Photocatalysis | |||||||||
| Journal or Publication Title: | Advanced Science | |||||||||
| Publisher: | Wiley - V C H Verlag GmbH & Co. KGaA | |||||||||
| ISSN: | 2198-3844 | |||||||||
| Official Date: | 21 January 2022 | |||||||||
| Dates: |
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| Article Number: | 2105380 | |||||||||
| DOI: | 10.1002/advs.202105380 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Reuse Statement (publisher, data, author rights): | ** Article version: VoR ** From Wiley via Jisc Publications Router ** History: received 23-11-2021; pub-electronic 21-01-2022. ** Licence for VoR version of this article: http://creativecommons.org/licenses/by/4.0/ | |||||||||
| Access rights to Published version: | Open Access | |||||||||
| RIOXX Funder/Project Grant: |
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