Oxygen reactions on Pt{hkl} in a non-aqueous Na+ electrolyte: site selective stabilisation of a sodium peroxy species



Galloway, Thomas A, Dong, Jin-Chao, Li, Jian-Feng, Attard, Gary and Hardwick, Laurence J ORCID: 0000-0001-8796-685X
(2019) Oxygen reactions on Pt{hkl} in a non-aqueous Na+ electrolyte: site selective stabilisation of a sodium peroxy species. Chemical Science, 10 (10). 2956 - 2964.

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Abstract

Sodium–oxygen battery cathodes utilise the reversible redox species of oxygen in the presence of sodium ions. However, the oxygen reduction and evolution reaction mechanism is yet to be conclusively determined. In order to examine the part played by surface structure in sodium–oxygen electrochemistry for the development of catalytic materials and structures, a method of preparing clean, well-defined Pt electrode surfaces for adsorption studies in aprotic solvents is described. Using cyclic voltammetry (CV) and in situ electrochemical shell-isolated nanoparticle enhanced Raman spectroscopy (SHINERS), the various stages of oxygen reduction as a function of potential have been determined. It is found that on Pt{111} and Pt{110}-(1 × 1) terraces, a long lived surface sodium peroxide species is formed reversibly, whereas on Pt{100} and polycrystalline electrodes, this species is not detected.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 28 Jan 2019 09:09
Last Modified: 24 Sep 2021 22:11
DOI: 10.1039/C8SC05489D
Open Access URL: http://10.0.4.15/C8SC05489D
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3031891