ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Studies on oxygen evolution reaction performance of porous Co₃O₄–NiO–B₂O₃ composites

K. S. Govardhan Rathla, A. S. Jagadisha, E. Nagaraja, B. N. Prashanth Kumar, D. G. Prasanna, and S. D. Umesha

Department of Physics, Government First Grade College, kadur, India

E-mail: jagadisha.as@gmail.com

Received: 22 April 2022  Accepted: 30 September 2022

Abstract:

In this article, Co₃O₄–NiO–B₂O₃ composites were synthesized via a simple solution combustion method where B₂O₃ composition is varied from 0 to 50%. The oxygen evolution performance of the Co₃O₄–NiO–B₂O₃ composites was investigated. The 40% of B₂O₃ added Co₃O₄–NiO composite exhibits an enhanced OER performance where it requires low overpotential of 322 mV (1.54 V vs. RHE) to reach the current density of 50 mA cm⁻², which is much lower than that of the 738 mV (1.96 V vs. RHE) and 492 mV (1.72 V vs. RHE) exhibited by bare screen printed electrode (SPE) and pristine Co₃O₄–NiO composite, respectively. The enhanced OER performance is attributed to significant enhancement in the accessible surface active sites and decrease in charge transfer resistance. Further, the NCB₄₀ shows excellent OER stability and durability over 25 h of continuous electrolysis.

Keywords: B2O3 addition; Co3O4–NiO composite; Oxygen evolution reaction; High performance

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02526-0

Chemical Papers 77 (2) 867–875 (2023)