A synthetic strategy for graphitized carbon hollow nanospheres with nano-punched holes decorated with bimetallic selenide as efficient bifunctional electrocatalysts for rechargeable Li-O2 batteries

Jeong Hoo Hong, Jin Koo Kim, Dae Soo Jung, Yun Chan Kang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The development of efficient bifunctional electrocatalysts is important for improving the electrochemical performance of Li-O2 batteries (LOBs). Herein, porous graphitized carbon hollow nanospheres (denoted as PGHs) with nano-punched holes containing suitable defects and minimal amorphous carbon content are developed as highly efficient substrates for loading metal-compound electrocatalysts. For preparing PGH, Fe metal is employed as a nanocatalyst to convert amorphous carbon to graphitic carbon with high electrical conductivity, and nano-punched holes are formed via the selective combustion of amorphous carbon and elimination of Fe metal. PGH possessing nano-punched holes and meso-/macropores facilitates the diffusion of dissolved oxygen and provides sufficient space to store the Li2O2 generated during the discharge process. Compared to hollow porous amorphous carbon nanospheres (denoted as PAHs), PGH exhibits a lower overpotential and higher specific capacity. To hybridize with metal selenide, NiFe selenide nanoparticles are uniformly loaded onto PGH (PGH/NiFeSe) via simple impregnation and subsequent selenization. By introducing NiFe selenide, the LOB performances of the hybrid electrode are enhanced compared to those of an electrode comprising PGHs and PAHs. Due to the metal selenide nanoparticles and suitable porous structure of the carbon substrate, PGH/NiFeSe exhibits improved electrochemical performance in LOBs, including reduced polarization, high specific discharge/charge capacity, and stable cycle performance.

Original languageEnglish
Pages (from-to)14997-15005
Number of pages9
JournalJournal of Materials Chemistry A
Volume11
Issue number27
DOIs
Publication statusPublished - 2023 Jun 13

Bibliographical note

Funding Information:
This research was supported by the Bio & Medical Technology Development Program of the National Research Foundation (NRF) & funded by the Korean government (NRF-2022M3A9I3082366).

Publisher Copyright:
© 2023 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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