Electrodeposition of nickel hexacyanoferrate/layered double hydroxide hybrid film on the gold electrode and its application in the electroanalysis of ascorbic acid

• Nickel hexacyanoferrate and Ni-Al LDH film was synthesized by an electrodeposition method.
• The composition and morphology of the hybrid film can be adjusted by different strategies.
• This modified electrode was used for the electroanalysis of AA.
• The proposed sensor was found to be linear, sensitive, selective, precise and accurate.

Nickel hexacyanoferrate (NiHCF) and Ni-Al layered double hydroxide (LDH) hybrid film was fabricated on the gold electrode by a two-step electrodeposition method. Varying the strategies of electrodeposition of NiHCF, the hybrid films showed different morphology, composition and electrochemical behavior. As a demonstration, the hybrid film fabricated by using the absorbed Ni2+ on Ni-Al LDH modified gold electrode for the next electrodeposition of NiHCF was used for the electroanalysis of ascorbic acid (AA). The analytical performance of the proposed electrode was investigated by cyclic voltammetry and chronamperometry. The linearity range of AA was from 0.1 to 3.5 mM with a detection limit (S/N = 3) of 21 μM. The developed method was found to be linear, sensitive, selective, precise and accurate. The applicability of the method was confirmed by the satisfactory results in real sample analysis.