Application of Binder free Anode Electrode in Direct Ethanol Fuel Cell

Herein, we present a structural involving a novel anode with a large surface area was produced by embedding ۳D CoCu-MOF on the conventional carbon felt via a simple solvothermal route. Comparative of the cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and chronoamperometry (CA) techniques in ۱ M alkaline solution containing ۰.۵ M ethanol established that the CoCu-MOF catalyst simplified the electron transfer and increased anodic reaction rates. A direct ethanol fuel cell (DEFC) equipped with this binder-free CoCu-MOF/CF anode was found to be executable and reached the maximum power density of ۲۲.۵ mW cm−۲.DEFCs are promising as the subsequent generation of clean energy for their advantages such as high energy efficiency, easy storage, low toxicity, and mass production of ethanol from biomass۱,۲. The complete oxidization of ethanol and producing electrons, protons, and CO۲ is strict, and the dominant product in the imperfect oxidation reaction of ethanol, is acetic acid and the number of electron transfers is ۴ electrons in lieu of ۱۲ electrons per one ethanol molecule۲. Therefore, one of the keys to propelling fuel cell technology is to extend efficient and stable electrocatalysts for the anodic EOR. Although noble metals as a highly efficient catalyst for the EOR, their rarity and poor long-term stability attend intensive interest in exploring other noble metal-free catalysts۳. As an interesting modern category of porous materials, metal−organic frameworks (MOFs) due to their high surface areas and coordination varieties, enticed significant consideration in the field of catalysis۴. Their unique significant features i.e. high surface area and favor pore size to be a promising non-noble catalysts option for various energy-related fields such as electrode materials for fuel cells۵.Schematic ۱ demonstrated of the synthesis procedure By comparison of CVs of electrocatalysts it can be seen that the current density of EOR ondifferent catalysts is increasing in the order of CoCu-MOF/GCE > Co-MOF/GCE > Cu-MOF/GCE (Fig. ۱a). The performance of direct ethanol fuel cell with this binder-free CoCu-MOF/CF as an anode electrode and Pt/C loaded onto of Nafion membrane using catalyst coatedmembrane (CCM) technique were investigated. As shown in Figure (۱b), in optimumconcentration, ۳.۰ M Ethanol/۲.۰ M NaOH for the anolyte and ۰.۵ M H۲SO۴/۲.۰ M H۲O۲ for thecatholyte, DEFC delivered a high open-circuit potential of ۰.۸۵ V and a maximum power density of ۲۲.۵ mW cm−۲ at ۶۰ ̊C.

کلیدواژه ها:

Metal-Organic Frameworks ، Carbon felt ، EOR ، Fuel cell