NixRh1-xOy composite nanofibres as highly efficient and robust oxygen evolution electrocatalysts

Dasol Jin, Areum Yu, Youngmi Lee, Myung Hwa Kim, Chongmok Lee

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Metal oxide composite nanofibres consisting of Ni and Rh (denoted as NixRh1−xOy, 0 < x < 1) were synthesised using a simple electrospinning and post-calcination process. The electrospun NixRh1−xOy composite nanofibres showed various morphologies and crystallinities depending on the relative molar ratio of Ni to Rh. While NixRh1−xOy with a high Ni content (0.67 ≤ x ≤ 0.83) showed the typical structure of nanotube-like main backbones decorated with flake-sprouts and consisted of amorphous Rh oxide and crystalline NiO, Ni0.57Rh0.43Oy, with its more moderate Ni content, had a smooth nanofibre structure, which was also composed of amorphous Rh oxide and crystalline NiO. On the other hand, NixRh1−xOy (0.27 ≤ x ≤ 0.39) possessed a rugged nanofibre structure consisting of crystalline RhOy and NiO. Electrocatalytic activity measurements of the electrospun composite nanofibres, when used for an oxygen evolution reaction (OER), demonstrated that the Ni0.77Rh0.23Oy nanofibres were the most effective in a 1 M NaOH aqueous solution. Ni0.77Rh0.23Oy, with a high content of relatively inexpensive Ni, presented OER activity and stability that were superior even to those of commercial iridium, and can be considered as a promising cost-effective catalyst. In our study, the high OER activity of Ni0.77Rh0.23Oy could be reasonably ascribed to the unique morphological and crystalline characteristics as well as the synergistic effect of mixed Ni and Rh oxides.

Original languageEnglish
Article number155309
JournalJournal of Alloys and Compounds
StatePublished - 25 Sep 2020

Bibliographical note

Funding Information:
This work was financially supported by the National Research Foundation of Korea (NRF) and funded by the Ministry of Science and ICT ( NRF-2019R1F1A1059969 for CL) and Basic Science Research Program through the NRF funded by the Ministry of Education ( NRF-2020R1A2B5B01001984 for YL, 2019R1F1A1062799 for KMH, and 2018R1A6A1A03025340 for YL and KMH).

Publisher Copyright:
© 2020 Elsevier B.V.


  • Amorphous materials
  • Electrospinning
  • Mixed metal oxide composite nanofibres
  • Nickel
  • Oxygen evolution catalysis
  • Rhodium


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