Designing bifunctional catalysts for oxygen reduction/evolution reactions for high efficiency and long lifetime

Cited 0 time in webofscience Cited 0 time in scopus
53 Viewed 12 Downloaded
Title
Designing bifunctional catalysts for oxygen reduction/evolution reactions for high efficiency and long lifetime
Author(s)
NiranjanmurthiLingappan; Bing Li; Tae Hoon Lee; Young Hee Lee
Publication Date
2019-08
Journal
ELECTROCHIMICA ACTA, v.313, no., pp.41 - 47
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
© 2019 Elsevier Ltd Designing efficient and durable bifunctional oxygen catalyst to replace expensive Pt catalysts in oxygen reduction reaction and oxygen evolution reaction is crucial for various energy conversion devices, such as metal-air batteries and fuel cells. Although various nanocarbon/metal oxides have been developed, their catalytic efficiencies remain unsatisfactory; moreover, bi-functionality and the issue of long-term durability have remained elusive goals. Herein, we report the self-assembly of interconnected nickel-cobaltite nanocrystals on nitrogen-doped graphene via hydrothermal synthesis. The Co 3+ sites, the key radicals for bifunctional oxygen reduction and evolution reactions. Well-dispersed nitrogen-doped graphene serve as a platform for anchoring the interconnected nickel-cobaltite nanocrystals and improve the conductivity to maintain a high saturation current in oxygen reduction and low overpotential in evolution reaction, similar to Pt/C. Lifetimes as long as 200 h for oxygen reduction and 300 h for oxygen evolution are demonstrated with negligible degradations. The present approach paves the way for the rational design of various Gr-metal oxide hybrids for numerous applications
URI
https://pr.ibs.re.kr/handle/8788114/5963
ISSN
0013-4686
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
Designing bifunctional_Electrochimica Acta_Young Hee Lee.pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

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

Browse