File Download

There are no files associated with this item.

  • Find it @ UNIST can give you direct access to the published full text of this article. (UNISTARs only)
Related Researcher

정후영

Jeong, Hu Young
UCRF Electron Microscopy group
Read More

Views & Downloads

Detailed Information

Cited time in webofscience Cited time in scopus
Metadata Downloads

Synergistic Coupling Derived Cobalt Oxide with Nitrogenated Holey Two-Dimensional Matrix as an Efficient Bifunctional Catalyst for Metal-Air Batteries

Author(s)
Kim, JeongwonGwon, OhhunKwon, OhhunMahmood, JaveedKim, ChangminYang, YejinLee, HansolLee, Jong HoonJeong, Hu YoungBaek, Jong-BeomKim, Guntae
Issued Date
2019-05
DOI
10.1021/acsnano.9b00320
URI
https://scholarworks.unist.ac.kr/handle/201301/27037
Fulltext
https://pubs.acs.org/doi/10.1021/acsnano.9b00320
Citation
ACS NANO, v.13, no.5, pp.5502 - 5512
Abstract
Developing cost-effective, efficient bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is the heart of metal air batteries as a renewable-energy technology. Herein, well distributed nanopolyhedron (NP) Co3O4 grown on iron (Fe) encapsulated in graphitic layers on a nitrogenated, porous two-dimensional (2D) structure, namely, a C2N matrix, (NP Co3O4/Fe@C2N), presents an outstanding bifunctional catalytic activity with a comparable overpotential and Tafel slope to those of benchmark Pt/C and Ir02. The rationally designed atomic configuration of Co3O4 on the C2N matrix has a well-controlled NP morphology with a (111) plane, leading to bifunctional activities for the ORR and OER. Interestingly, the specific interaction between the NP Co3O4 nanoparticles and the C2N matrix introduces synergistic coupling and changes the electronic configuration of Co atoms and the C2N framework. Benefiting from the synergistic coupling of Co3O4 with C2N matrix, the NP Co3O4/Fe@C2N electrocatalyst exhibits exceptionally high stability and an even lower charge discharge overpotential gap of 0.85 V at 15 mA cm-2 than that of the Pt/C+IrO2 catalyst (1.01 V) in Zn air batteries. This work provides insights into the rational design of a metal oxide on a C2N matrix for bifunctional, low-cost electrochemical catalysts.
Publisher
AMER CHEMICAL SOC
ISSN
1936-0851
Keyword (Author)
synergistic couplingmetal air batteriescatalystoxygen reductionoxygen evolution
Keyword
OXYGENCARBONHYBRIDNANOCRYSTALSGRAPHENEELECTROCATALYSTPEROVSKITEAEROGEL

qrcode

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.