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Lee, Hyun-Wook
Energy Storage and Electron Microscopy Laboratory
Research Interests
  • Energy storage, secondary batteries, transmission electron microscopy, real time analysis

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Diffusion controlled multilayer electrocatalysts via sized graphene oxide nanosheets

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Title
Diffusion controlled multilayer electrocatalysts via sized graphene oxide nanosheets
Author
Gu, MinsuChoi, JaewonLee, TaeminPark, MinjuShin, Ik-SooHong, JinkeeLee, Hyun-WookKim, Byeong-Su
Issue Date
201809
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.10, no.34, pp.16159 - 16168
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 sizes, employing a versatile layer-by-layer (LbL) assembly method. We demonstrate that the electrocatalytic activity is highly tunable through the 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 the 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 the tortuous-path effect on the electrocatalytic electrode supported by varying sized graphene provide new insights and a novel design principle into electrode engineering that will be beneficial for the development of effective electrocatalysts.
URI
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DOI
http://dx.doi.org/10.1039/C8NR02883D
ISSN
2040-3364
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