Boosting the electrochemical characteristics of nickel-iron cyano-bridging metal organic framework via thermal curing for developing supercapacitor and electrocatalyst platforms

Document Type : Regular Articles

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Chemistry Department, Faculty of Science, Sohag University 82524, Egypt

Abstract

Abstract: Cyano-bridging metal organic frameworks or Prussian blue analogues (PBA) have attracted much attention for developing electrochemical-based devices because of large surface area, stability, conductivity and interesting redox features. Herein, nickel-iron cyano-bridging metal framework (NICF) was prepared by a simple co-precipitation method, calcined at high temperatures and the utilized for electrochemical applications. Nano-sized nickel-iron cyano-bridging metal framework with a large surface-area and pure cubic crystal was obtained. The NICF was calcined at different temperatures (100, 200, 300, 400 and 500 oC) then the electrochemical properties were studied by simple drop cast on a glassy carbon electrode (GCE). Interestingly, the S100/GCE platform (for NICF sample calcined at 100 oC) showed a superior specific capacitance (Cs) of 571 F/g compared to 428 F/g for NICF/GCE in 0.1M KOH. While, the S200/GCE (for NICF calcined at 200 oC) exhibited a low overpotential (η) of 450 mV toward oxygen evolution reaction (OER) compared to 1.0 V and 1.3 V for as-prepared NICF modified GCE and unmodified GCE, respectively to deliver a current density of 10 mA/cm2 in 1.0 M KOH. Based on these results, it was found the thermal curing of NICF at relatively high temperature could be used as a simple approach for boosting the electrochemical features of PBA leading to design efficient and low-cost electrochemical-based devices.

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Sohag Journal of Sciences
Volume 7, Issue 3
September 2022
Pages 103-110

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