Hierarchical Porous Carbonized Co3O4 Inverse Opals via Combined Block Copolymer and Colloid Templating as Bifunctional Electrocatalysts in Li–O2 Battery

Seol A. Cho, Yu Jin Jang, Hee Dae Lim, Ji Eun Lee, Yoon Hee Jang, Trang Thi Hong Nguyen, Filipe Marques Mota, David P. Fenning, Kisuk Kang, Yang Shao-Horn, Dong Ha Kim

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Abstract

Hierarchically organized porous carbonized-Co3O4 inverse opal nanostructures (C-Co3O4 IO) are synthesized via complementary colloid and block copolymer self-assembly, where the triblock copolymer Pluronic P123 acts as the template and the carbon source. These highly ordered porous inverse opal nanostructures with high surface area display synergistic properties of high energy density and promising bifunctional electrocatalytic activity toward both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). It is found that the as-made C-Co3O4 IO/Ketjen Black (KB) composite exhibits remarkably enhanced electrochemical performance, such as increased specific capacity (increase from 3591 to 6959 mA h g−1), lower charge overpotential (by 284.4 mV), lower discharge overpotential (by 19.0 mV), and enhanced cyclability (about nine times higher than KB in charge cyclability) in Li–O2 battery. An overall agreement is found with both C-Co3O4 IO/KB and Co3O4 IO/KB in ORR and OER half-cell tests using a rotating disk electrode. This enhanced catalytic performance is attributed to the porous structure with highly dispersed carbon moiety intact with the host Co3O4 catalyst.

Original languageEnglish
Article number1700391
JournalAdvanced Energy Materials
Volume7
Issue number21
DOIs
StatePublished - 8 Nov 2017

Keywords

  • bifunctional electrocatalysts
  • hierarchical carbon-cobalt oxide inverse opal
  • lithium–oxygen batteries
  • oxygen evolution reaction
  • oxygen reduction reaction

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