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

Studies on the effect of crystalline Fe₂O₃ on OER performance of amorphous NiOOH electrodeposited on stainless steel substrate

P. Sagar, K. Yogesh, Asad Syed, Najat Marraiki, Abdallah M. Elgorban, Nouf S. S. Zaghloul, and S. Ashoka

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

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

Received: 4 June 2022  Accepted: 17 July 2022

Abstract:

Oxygen evolution reaction (OER) is a prime reaction process involved in water splitting with productive usage of renewable energy sources has become a fascinating empirical trend for clean energy cropping and efficient energy storage. Herein, a facile two-step cathodic deposition followed by anodic activation protocol has been demonstrated, using a simple DC power supply, for the preparation of NiOOH\Fe₂O₃ composite made of amorphous NiOOH and crystalline Fe₂O₃ confirmed by powder X-ray diffraction (XRD), X-ray photoelectron (XPS), Raman spectroscopy and cyclic voltammogram (CV) results. The anodic activation increases the concentration of Ni³⁺ on the surface and thereby enhances the OER performance. The thin film of crystalline Fe₂O₃ enhances the OER performance, while thick film of crystalline Fe₂O₃ significantly decreases the OER performance of amorphous NiOOH. The NiOOH\Fe₂O₃ composite displays the low overpotential of 325 mV@10 mA cm⁻² (1.55 V vs. RHE) with excellent long-term stability over 50 h.

Keywords: Anodic activation; Amorphous NiOOH; Crystalline Fe2O3; OER performance

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02382-y

Chemical Papers 76 (11) 7195–7203 (2022)