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On the reactivity of aqueous radiolysis products towards carbon black used in in-situ radiation-synthesis of catalytic nanoparticles in graphite electrodes

Zhuofeng Li,M. Jonsson

Published 2021 in Carbon

ABSTRACT

Abstract Enhanced electrochemical performance of graphite electrodes can be achieved by incorporation of catalytic nanoparticles. One promising method for incorporation is in-situ radiation-synthesis where the radiolysis of water is used to drive the process of particle formation on carbon black. A potential problem is the direct reaction between radiolysis products and carbon black. In this work the reactivities of radiolytically produced HO•, (CH3)2C•OH, e-aq and H2O2 towards carbon black were investigated at room temperature with a dose rate 0.124 Gy s-1. HO• was found to react with carbon black with a rate constant of 20 ± 5 m s-1. For (CH3)2C•OH the corresponding value is 0.8 ± 0.1 m s-1. The reactivity of e-aq towards carbon black is negligible compared to that of (CH3)2C•OH. At concentrations

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