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Triple Hierarchical Porous Carbon Spheres as Effective Cathodes for Li-O-2 Batteries

Title
Triple Hierarchical Porous Carbon Spheres as Effective Cathodes for Li-O-2 Batteries
Author
선양국
Keywords
ORDERED MESOPOROUS CARBON; OXYGEN REDUCTION REACTION; SURFACE-AREA; METAL; PERFORMANCE; GRAPHENE; RECHARGEABILITY; REVERSIBILITY; ELECTRODES; CATALYSTS
Issue Date
2019-02
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v. 166, NO 4, Page. 455-463
Abstract
This paper presents the synthesis and characterization of triple hierarchical porous carbon spheres as cathodes in lithium-oxygen batteries. The porous carbon cathode exhibits a higher discharge capacity and average discharge potential compared to a typical carbon black cathode. This superior electrochemical result can be attributed to the triple hierarchical pores of the cathode: micropores that act as channels for oxygen to flow without interruption by the accumulated discharge product, abundant mesopores that shape the size of the discharge product and transport the electrolyte, and macropores that easily accommodate the accumulation of discharge product. To further promote Li2O2 formation/decomposition, the cathode can be decorated with a Ru catalyst, which strongly influences the oxygen evolution reaction performance. Conspicuously, triple hierarchical porous carbon spheres exhibit a homogeneous distribution of the Ru catalyst and thus provide an appropriate architecture. The synergistic effect from the unique structure and catalytic competence of Ru increases the capacity and rate capability with lower over-potential, and facilitates the formation of Li2O2. This can be decomposed at a low potential during recharge and thus contributes to the very high energy efficiency. (C) 2019 The Electrochemical Society.
URI
https://iopscience.iop.org/article/10.1149/2.0021904jeshttps://repository.hanyang.ac.kr/handle/20.500.11754/136760
ISSN
0013-4651; 1945-7111
DOI
10.1149/2.0021904jes
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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