DOI: https://doi.org/10.55373/mjchem.v26i5.56

Keywords: ZIF-8; fuel cell; transition metal dopant; cyclic voltammetry

Abstract

This study investigates the impact of various metallic dopants on the structure of zeolitic imidazolate framework (ZIF-8) when used as the anodic electrode in a fuel cell. The wet impregnation method is employed to incorporate different transition metals, including Titanium (Ti), Manganese (Mn), Cobalt (Co), Copper (Cu), Silver (Ag), and Gold (Au), into the ZIF-8 lattice structure. The electrochemical properties of these ZIFs are evaluated using Cyclic Voltammetry (CV) measurements. The CV plots for all electrodes exhibit regular capacitive characteristics, an asymmetric cyclic shape, and oxidation/reduction peaks. The Specific Capacitances (CP) for period 4 elements follow this increasing order: Cu/ZIF-8 (0.014013568 F/g) < Mn/ZIF-8 (0.017259853 F/g) < Ti/ZIF-8 (0.023771477 F/g) < Co/ZIF-8 (0.097503785 F/g). In the case of group 11 (1B) elements, the CP increases in the following order: Cu/ZIF-8 (0.014013568 F/g) < Ag/ZIF-8 (0.019497694 F/g) < Au/ZIF-8 (0.092614304 F/g). Based on these findings, it is evident that Co/ZIF-8 exhibits superior electrochemical properties for proton conduction and holds promise as a candidate for developing a fuel cell anode.