Single phase of spinel Co2RhO4 nanotubes with remarkably enhanced catalytic performance for the oxygen evolution reaction

So Yeon Kim, Areum Yu, Yejung Lee, Ha Yeon Kim, Yeon Jae Kim, Nam Suk Lee, Chongmok Lee, Youngmi Lee, Myung Hwa Kim

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

We report the effective crystal growth for a unique single phase of spinel cobalt rhodium oxide (Co2RhO4) nanotubes via the electrospinning process combined with the thermal annealing process. In the spinel structure of the electrospun Co2RhO4 nanotubes, Co3+ cations and Rh3+ cations randomly occupy the octahedral sites, while the remaining half of the Co2+ cations occupy the centres of the tetrahedral sites as proved by microscopic and spectroscopic observations. Furthermore, electrospun spinel Co2RhO4 nanotubes exhibit excellent catalytic performances with the least positive onset potential, greatest current density, and low Tafel slope which are even better than those of the commercial Ir/C electrocatalyst for the oxygen evolution reaction (OER) in alkaline solution. Our demonstration of significantly enhanced OER activity with a single phase of electrospun spinel Co2RhO4 nanotubes thus opens up the broad applicability of our synthetic methodology for accessing new OER catalysis.

Original languageEnglish
Pages (from-to)9287-9295
Number of pages9
JournalNanoscale
Volume11
Issue number19
DOIs
StatePublished - 21 May 2019

Bibliographical note

Funding Information:
This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT and Future Planning (NRF-2017R1A2A2A14001137 for YL and NRF-2016R1D1A1B03934962 for MHK) and by Basic Science Research Program through the NRF funded by the Ministry of Education (NRF-2018R1A6A1A03025340).

Publisher Copyright:
© 2019 The Royal Society of Chemistry.

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