Large-scale synthesis of centrifugally spun tantalum oxynitride fiber electrocatalysts for hydrogen evolution reaction

Raghunath Sharma Mukkavilli, Abhinav Saxena, Seulgi Ji, Ganesh Babu Thiyagarajan, Heechae Choi, Sanjay Mathur, Ravi Kumar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Tantalum oxynitride (TaOxN1−x) fibers were synthesized and evaluated for their electrocatalytic hydrogen activity using an in-house developed centrifugal spinning setup. By tailoring the composition of the spinning solution and optimizing collector distance and rotation speed of the spinneret, bead-free TaOxN1−x fibers with a diameter of 800 nm were obtained. The fibers were structurally characterized through phase and elemental analysis, confirming the formation of monoclinic TaOxN1−x with clear splitting of the X-ray photoelectron spectroscopy peaks indicating Ta was in +5 oxidation state. The resulting oxynitride fibers exhibited superior electrocatalytic performance with low overpotentials (250 mV) to generate 10 mA/cm2 compared to Ta2O5 oxide fibers. Interestingly, the enhanced activity of oxynitride fibers was observed to be suppressed in basic medium due to the high oxophilicity of tantalum ions and a negative Gibbs adsorption-free energy, leading to poisoning of the active sites. This work demonstrates a facile pathway for the fabrication of high-performance electrocatalysts, based on TaOxN1−x fibers, from a cost-effective and energy-efficient centrifugal spinning technique.

Original languageEnglish
Pages (from-to)6398-6412
Number of pages15
JournalJournal of the American Ceramic Society
Volume106
Issue number11
DOIs
Publication statusPublished - Nov 2023

Keywords

  • electrolysis
  • fibers
  • oxynitride

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