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Validation of enhanced OER performance of the amorphous Al2O3-added Co3O4/NiO two-dimensional ternary nanocomposite

P. Sagar, L. Shreenivasa, Asad Syed, Najat Marraiki, and S. Ashoka

Department of Chemistry, School of Engineering, Dayananda Sagar University, Bengaluru, India

 

E-mail: ashok-chem@dsu.edu.in

Received: 9 July 2021  Accepted: 21 September 2021

Abstract:

The exploration of non-noble metal-based electro-catalysts to catalyze oxygen evolution reaction (OER) is imperative in sustainable energy development technology. Herein, the validation of improved electro-catalytic performance of an amorphous Al2O3-added Co3O4/NiO nanocomposite toward OER has been reported. Co3O4/NiO nanocomposite, 10%, 20% and 40% of amorphous Al2O3-added Co3O4/NiO nanocomposites were synthesized via a simple nitrate–citrate decomposition method. The experimental results evidenced that the 20% amorphous Al2O3-added Co3O4/NiO nanocomposite exhibits enhanced OER performance where the current density of 50 mA cm−2 is achieved at 389 mV, demonstrating 448 mV improvement as compared to the amorphous Al2O3 free Co3O4/NiO nanocomposite. Double-layer capacitance results reveal that the enhanced OER performance, in case of 20% amorphous Al2O3-modified Co3O4/NiO nanocomposite, results ~ 3.5 times increased electrochemically active surface area. This work suggests that the addition of optimum amount of amorphous Al2O3 to the Co3O4/NiO nanocomposite offers an attractive cost-effective catalyst for water-splitting devices.

Keywords: Amorphous Al2O3; Co3O4/NiO nanocomposite; Oxygen evolution reaction; High current density

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01898-z

 

Chemical Papers 76 (3) 1433–1441 (2022)

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