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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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Official URL: https://doi.org/10.1002/advs.202105380

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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
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
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:
DateEvent
21 January 2022Available
UNSPECIFIEDAccepted
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:
Project/Grant IDRIOXX Funder NameFunder ID
DLR 50WM1848 Bundesministerium für Wirtschaft und EnergieUNSPECIFIED
UNSPECIFIEDCroucher Foundationhttp://dx.doi.org/10.13039/501100001692
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