Publication date: 7th February 2022
Nickel cobaltite based nanostructured electrocatalysts for the alkaline water oxygen evolution reaction (OER)
Prerna Upale, Richa Bobade, Satishchandra B. Ogale* and Seema Verma*
The field of electrocatalysis has seen much progress in recent years as this has become the core of the energy conversion technologies involving oxygen (OER, ORR) and hydrogen (HER, HOR). Classically, IrO2 and RuO2 are the benchmark OER catalysts, the prohibitive cost and scarcity of the noble metals greatly hinder their wide applications on a large scale. It is thus attractive to design efficient water-splitting catalysts comprising earth-abundant elements, especially bifunctional catalysts that could greatly simplify the water-splitting system design and thus lowering its cost. Focus of the present work is to achieve highly efficient NiCo based electrocatalysts of varying compositions (NixCo3-xO4; x= 0.1, 0.25, 0.75, 1, 1.25). Synthesis of spinel nickel cobaltite nanostructures of varying compositions (S1, S2, S3, S4 and S5) was done by a modified hydrothermal method followed by annealing at 350oC. The effect of Ni to Co molar ratio on phase purity, crystallinity, surface structural features, morphology, sizes, electrochemical properties were investigated through powder X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS). In order to obtain efficient binderless working electrodes, hierarchal NiCo nanostructures were grown directly on conducting Ni foam (NF) and carbon paper (CP) using an in-situ hydrothermal route. The results clearly indicated that the samples obtained are highly porous which are self assembled to form hierarchical nanochannel like structures. When assessed as an electrode for OER, all NiCo@NF electrodes show superior OER activity as compared to NiCo@CP electrodes. Among these, S5@NF shows excellent performance with low overpotential of 320 mV at 50 mA/cm2 and small tafel slope of 67 mV/dec. Much work in this direction is in progress.
Acknowledgements: SV has been supported by Woman Scientist research grant from Department of Science & Technology, Government of India (SR/WOS-A/CS-12/2019).
SV has been supported by Woman Scientist research grant from Department of Science & Technology, Government of India (SR/WOS-A/CS-12/2019).
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