Affiliation:
1. Department of Chemistry Utkal University Bhubaneswar Odisha 751004 India
2. Light Stock Processing Division CSIR‐Indian Institute of Petroleum Mohkampur Dehradun 248005 India
3. Radiochemistry Division Bhabha Atomic Research Centre Trombay Mumbai 400085 India
Abstract
Electrocatalyst plays an important role in enhancing the activity of water‐splitting reaction. Researchers are adopting various techniques like composite formation, doping, and creating vacancy, to improve the catalytic activity of the electrocatalyst. Herein, nickel selenide/iron selenide (NiSe2/FeSe2) electrocatalyst is synthesized for electrocatalytic water splitting application, i.e., for oxygen evolution reaction (OER) in 1.0 M KOH electrolytic solution. Further, the activity of the electrocatalyst is enhanced by creating selenium vacancies following a facile reduction method using hydrazine hydrate and simultaneously using ultrasonic power to form the catalyst, namely, Vse‐NiSe2/FeSe2. Vacancy engineering enhances the electrocatalytic activity of NiSe2/FeSe2 by increasing the electrochemical surface area and number of active sites. Pseudospherical Vse‐NiSe2/FeSe2 vacant sites offer insight into the efficient charge transfer and surface kinetics for the OER.