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A powerful role of exfoliated metal oxide 2D nanosheets as additives for improving electrocatalyst functionality of graphene

Title
A powerful role of exfoliated metal oxide 2D nanosheets as additives for improving electrocatalyst functionality of graphene
Authors
Jin X.Lim J.Lee N.-S.Hwang S.-J.
Ewha Authors
황성주
SCOPUS Author ID
황성주scopus
Issue Date
2017
Journal Title
Electrochimica Acta
ISSN
0013-4686JCR Link
Citation
vol. 235, pp. 720 - 729
Keywords
ElectrocatalystGrapheneMetal oxide nanosheetNanocompositeOxygen reduction reaction
Publisher
Elsevier Ltd
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
High performance Pt-free electrocatalyst can be synthesized by adding small amount of exfoliated layered metal oxide (CoO2/Ti1−xO2/RuO2) nanosheets into N-doped reduced graphene oxide (rG-O) matrix. The incorporation of 2D metal oxide nanosheet is highly effective not only in increasing the surface area and pyridinic N content of N-doped rG-O but also in promoting its ion transport. Of prime importance is that, even at low content of metal oxide nanosheet (<4 wt%), the metal oxide nanosheet–N-doped rG-O nanocomposites exhibit much higher electrocatalyst activity for oxygen reduction reaction with better selectivity and long-term stability than does N-doped rG-O. Such a beneficial effect of metal oxide nanosheet is much more prominent than that of metal oxide nanoparticle, underscoring unique merit of 2D nanosheet morphology. The superior role of metal oxide nanosheet is attributable to the surface expansion, the increase of pyridinic N content, the provision of catalytically active sites, and the enhanced transport of ion and hydrated O2 upon the addition of metal oxide nanosheet. The present study clearly demonstrates that the incorporation of exfoliated metal oxide 2D nanosheets into the graphene matrix can provide an efficient and scalable method to explore high performance Pt-free electrocatalysts via the optimization of the functionalities of graphene. © 2017 Elsevier Ltd
DOI
10.1016/j.electacta.2017.03.134
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자연과학대학 > 화학·나노과학전공 > Journal papers
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