Synthesis of mesoporous Zn-MOFs based on pyrazole flexible ligands: application to electrocatalytical oxidation of methanol

Developing a low cost, highly active material is a high-priority research direction toward the commercialization of low-temperature fuel cells. However, the high cost and low stability of useable materials remain a considerable challenge for the widespread adoption of fuel cell energy conversion devices[۱]. Thus, the use alternative energy source especially direct methanol (CH۳OH) fuel cells (DMFCs) that offer maximum efficiency with highly efficient electrocatalyst and minimal pollution and carbon emissions has become a major goal[۲]. Therefore, The present work, we have designed mesoporous Zinc metal-organic frameworks (Zn-MMOFs) with pyrazole ligans, through simple chemical method at mild conditions[۲]. The mesoporous Zn-MMOFs nanocatalysts that was characterized by means of various instrumental techniques. In electrochemical studies, Zn-MMOFs were employed as excellent modifiers on the surface glassy carbon electrode (GCE) with Nafion (NF) as (Zn-MMOFs/Nf/GCE) modified electrode to investigate the analytical performance of CH۳OH with different electrochemical methods. Then, the Zn-MMOFs/Nf/GCE was used for the electrocatalytic oxidation of CH۳OH in alkaline media[۳]. In the next step, the kinetic parameters of the electron transfer coefficient (α) and number of electrons involved in the rate determining step (nα) for the oxidation of methanol were determined using cyclic voltametry. The anodic currents showed a linear dependence on the concentration of CH۳OH. These results showed syntesis of Zn-MOFs with pyrazol linkers and pretreatment MOFs material with cationic surfactants remarkably improved electrocatalytical performance synthesized nanocatalysts and consequently opens a way to design a high performance capable electrocatalyst for direct methanol fuel cell systems

کلیدواژه ها:

Mesoporous ، fuel cell ، Metal-organic frameworks