Graphene-like sheets supported Fe–Co layered double hydroxides nanoflakes as an efficient electrocatalyst for both hydrogen and oxygen evolution reaction, A green investigation
2022
Ensafi, Ali A. | Mandian-Talkhoonche, B. | Heydari-Soureshjani, E. | Rezaei, B.
Herein, a nanohybrid material containing graphene-like sheets (GS) and Fe–Co layered double hydroxides nanoflakes (LDHs) was synthesized via simple two-step processes and named Fe–Co LDHs/GS. The Fe–Co LDHs/GS nanohybrid was characterized by various techniques. Fe–Co LDHs nanoflakes were grown on GS in Fe–Co LDHs/GS nanohybrid. The electrochemical surface area of Fe–Co LDHs/GS nanohybrid was obtained 0.05 cm² based on the Randles-Sevcik equation. The Fe–Co LDHs/GS nanohybrid was applied as an electrocatalyst of HER and OER in a 1.0 M KOH. The electrochemical performance of Fe–Co LDHs/GS nanohybrid was surveyed by several electrochemical methods, and long-term electrochemical stability. The onset potential, overpotential at 10 mA cm⁻¹ current density, and Tafel slope for the Fe–Co LDHs/GS nanohybrid were obtained −0.33 V, −0.43 V (ᵥₛ. RHE), and 122 mV dec⁻¹, respectively. The Fe–Co LDHs/GS nanohybrid has long-term stability over 35 h in alkaline media toward HER. Furthermore, the onset potential, overpotential at 10 mA/cm, and Tafel slope for the Fe–Co LDHs/GS nanohybrid were obtained as 1.52 V, 1.60 V (vs. RHE), and 44 mV dec⁻¹, respectively. The Fe–Co LDHs/GS nanohybrid has long-term durability over 10 h in alkaline media toward OER.
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