Molecularly rigid porous polyamine host enhances barium titanate catalysed H 2 O 2 generation †

Karunakaran, Akalya, Bowen, Chris R., Dunn, Steve, Pham, Thuy-Phuong T., Folli, Andrea ORCID: https://orcid.org/0000-0001-8913-6606, Fletcher, Philip J., Carta, Mariolino ORCID: https://orcid.org/0000-0003-0718-6971, McKeown, Neil B. and Marken, Frank 2024. Molecularly rigid porous polyamine host enhances barium titanate catalysed H 2 O 2 generation †. New Journal of Chemistry 10.1039/d4nj03460k

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Abstract

Barium titanate (BTO) is well-known (as a photo- or sono/piezo-catalyst) to produce hydrogen peroxide via 2-electron reduction of oxygen in the presence of a sacrificial quencher, such as isopropanol. While barium titanate nanoparticles with a tetragonal crystal structure (piezoelectric) are particularly reactive, the recovery and reuse of these nano-catalysts from reactions can be difficult. Here, barium titanate nanoparticles of typically 200 nm to 600 nm diameter are embedded into a host film of a polymer of intrinsic microporosity (PIM-EA-TB). Due to molecular rigidity of the polymer, there is no capping effect, and the surface catalytic reaction occurs effectively with a catalyst embedded in the polymer. In this exploratory work, the catalytic formation of H2O2 in the presence of isopropanol is investigated via kinetic studies and by electron paramagnetic resonance (EPR). Perhaps surprisingly, at a neutral pH the rate of the catalytic reaction is substantially increased when barium titanate is embedded into the polymer host and when the polymer is protonated. This is attributed here to a “kinetic cage effect” which exploits the tertiary amine in the polymer backbone with anodic and cathodic processes coupled into a pH neutral reaction.

Item Type:	Article
Date Type:	Published Online
Status:	In Press
Schools:	Chemistry
Additional Information:	License information from Publisher: LICENSE 1: URL: https://creativecommons.org/licenses/by/3.0/, Start Date: 2024-09-02
Publisher:	Royal Society of Chemistry
ISSN:	1144-0546
Date of First Compliant Deposit:	6 September 2024
Date of Acceptance:	2 September 2024
Last Modified:	06 Sep 2024 08:00
URI:	https://orca.cardiff.ac.uk/id/eprint/171852

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