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Keynote Lecture

WEB Construction of three-dimensional core-shelled NiCo2O4@CoS structure on Ni-Foam for electrocatalytic oxygen evolution activity and urea splitting

Friday (25.09.2020)
09:00 - 09:30 Z: Special Symposia I
Part of:

Electrochemical energy-based models are quite successful in terms of workability and ease of functionality. In the hunt of sustainable energy storage systems with depleting fossil fuels, these models have attracted attention of researchers. The motivation of the present work was to construct a simple, versatile, and multi-functional electrocatalyst that contributes in both energy generation and environmental remediation simultaneously. As a proof of the concept, an electrocatalytically active core-shelled NiCo2O4@CoS material was grown over Ni-foam through combining hydrothermal and electrodeposition method. The hydrothermally grown three-dimensional chrysanthemum-like structure of NiCo2O4 becomes the core-host for CoS nanosheets which was confirmed for structural and morphological uniformity through physicochemical characterizations. The core-shell NiCo2O4@CoS/Ni-Foam electrocatalyst was investigated for its oxygen evolution activity and urea splitting ability. The synergistic activity with NiCo2O4@CoS/Ni-Foam electrocatalyst was observed in comparison to their individual counterparts. Electrodeposition of CoS on NiCo2O4 ensures an intact interface between the structures, which facilitated more electrochemically active sites and reduced charge transfer resistance as confirmed from double layer capacitance and impedance studies. The electrocatalytic activity in the presence of urea boosts the oxygen evolution reaction which aids in reducing the onset potential. The superior electrochemical properties of the fabricated NiCo2O4@CoS/Ni-foam electrocatalyst makes it a suitable candidate for urea electro-oxidation, while serving the purpose of sustainable energy generation, enhancing the OER reactivity through the boosted systems, and remediating urea-composed waste-water systems. Such non-noble metal-composed systems will lead to further insight into the development of new-generation energy material.

Prof. Do-Heyoung Kim
Chonnam National University
Additional Authors:
  • Dr. Sangeeta Adhikari
    Chonnam National University