Abstract
The performance of electrochemical water splitting is very much affected by the sluggishness of oxygen evolution reaction (OER) process. Therefore, design and development of low cost, stable and active catalyst for OER process is a challenging issue. In this study we have used cone-shaped pencil graphite (PG), which is commonly used for writing purpose, as anode followed by modification by two-dimensional (2D) nickel sulphide flakes for electrochemical OER in alkaline medium. The dispersed flakes gradually attached to the cone-shaped graphite pencil surface via interaction with exposed graphite sheets along with formation of porous network around the electrode surface via assembly of the flakes. The modified electrocatalyst were well characterized using X-ray diffraction, Raman, field emission scanning electron microscopy, energy dispersive X-ray, inductively coupled plasma atomic emission spectroscopy and electrochemical techniques. We have observed that the electrocatalytic activity and stability of the newly designed anode is far greater than standard IrO2 catalyst-modified PG in alkaline medium and comparable with newly reported Ni-based catalysts modified electrode in literature. The unique shape and porous network facilitate mass diffusion process preventing larger bubble formation. Overall, the approach is very simple and cost effective.
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Acknowledgements
AM would like to thank the Presidency University and Indian Association for the Cultivation of Science (IACS) for providing research facilities. HA and SG acknowledge DST, India, for providing research fellowship.
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Ali, H., Ghosh, S. & Mondal, A. Nickel sulphide flakes improved cone-shaped graphite electrode for high-performance OER activity. Bull Mater Sci 44, 230 (2021). https://doi.org/10.1007/s12034-021-02519-x
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DOI: https://doi.org/10.1007/s12034-021-02519-x