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Cobalt sulfide thin films for electrocatalytic oxygen evolution reaction and supercapacitor applications
- Kale, Shital B., Lokhande, Abhishek C., Pujari, Rahul B., Lokhande, Chandrakant D.
- Journal of colloid and interface science 2018 v.532 pp. 491-499
- capacitance, catalytic activity, cobalt sulfide, electrochemistry, electrodes, electrolytes, nanocrystals, oxygen production, potassium hydroxide, stainless steel
- Nanocrystalline cobalt sulfide thin film electrodes have been deposited on stainless steel substrate using binder-free chemical bath deposition (CBD) method and electrochemical study is performed in 1 M KOH electrolyte. Linear sweep voltammetry (LSV) curve shows that cobalt sulfide thin film electrode requires 300 mV overpotential (ƞ) to reach the current density of 10 mA cm⁻². Also, it exhibits Tafel slope of 57 mV decade⁻¹ with stable catalytic activity over 14 h. Along with good electrocatalytic oxygen evolution performance, in supercapacitive study it shows specific capacitance of 252.39 F g⁻¹ at a scan rate of 5 mV s⁻¹. The stability test indicates that cobalt sulfide electrode is stable for 1000 cyclic voltammetry (CV) cycles.