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Issue 21, 2017
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Understanding nanoparticle porosity via nanoimpacts and XPS: electro-oxidation of platinum nanoparticle aggregates

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Abstract

The porosity of platinum nanoparticle aggregates (PtNPs) is investigated electrochemically via particle-electrode impacts and by XPS. The mean charge per oxidative transient is measured from nanoimpacts; XPS shows the formation of PtO and PtO2 in relative amounts defined by the electrode potential and an average oxidation state is deduced as a function of potential. The number of platinum atoms oxidised per PtNP is calculated and compared with two models: solid and porous spheres, within which there are two cases: full and surface oxidation. This allows insight into extent to which the internal surface of the aggregate is ‘seen’ by the solution and is electrochemically active.

Graphical abstract: Understanding nanoparticle porosity via nanoimpacts and XPS: electro-oxidation of platinum nanoparticle aggregates

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Publication details

The article was received on 18 Mar 2017, accepted on 09 May 2017 and first published on 10 May 2017


Article type: Paper
DOI: 10.1039/C7CP01737E
Citation: Phys. Chem. Chem. Phys., 2017,19, 13547-13552
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    Understanding nanoparticle porosity via nanoimpacts and XPS: electro-oxidation of platinum nanoparticle aggregates

    X. Jiao, E. E. L. Tanner, S. V. Sokolov, R. G. Palgrave, N. P. Young and R. G. Compton, Phys. Chem. Chem. Phys., 2017, 19, 13547
    DOI: 10.1039/C7CP01737E

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