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Diffusion controlled multilayer electrocatalysts via sized graphene oxide nanosheets

Abstract

Controlling the architecture of hybrid nanomaterial electrodes is critical for understanding their fundamental electrochemical mechanisms and applying these materials in future energy conversion and storage systems. Herein, we report highly tunable electrocatalytic multilayer electrodes, composed of palladium nanoparticles (Pd NPs) supported by graphene sheets of varying lateral size, employing a versatile layer-by-layer (LbL) assembly method. We demonstrate that the electrocatalytic activity is highly tunable through control of the diffusion and electron pathways within the 3-dimensional multilayer electrodes. A larger-sized-graphene-supported electrode exhibited its maximum performance with a thinner film, due to facile charge transfer by the mass transfer limited in early stage, while a smaller-sized-graphene-supported electrode exhibited its highest current density with higher mass loading in the thicker films by enabling facile mass transfer through increased diffusion pathways. These findings of tortuous-path effect on electrocatalytic electrode supported by varying sized graphene provides new insights and a novel design principle in electrode engineering that will be beneficial for the development of effective electrocatalysts.

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Publication details

The article was received on 10 Apr 2018, accepted on 27 Jul 2018 and first published on 30 Jul 2018


Article type: Paper
DOI: 10.1039/C8NR02883D
Citation: Nanoscale, 2018, Accepted Manuscript
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    Diffusion controlled multilayer electrocatalysts via sized graphene oxide nanosheets

    M. Gu, J. Choi, T. Lee, M. Park, I. Shin, J. Hong, H. Lee and B. Kim, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR02883D

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