Question

1)compare SOFE and PEM fuel cell operation?
2)What are Metal Organic Frameworks? Name one MOF for hydrogen storage?

Answer 1

A solid oxide fuel cell produces electricity directly from fuel. In an SOFC, the electrolyte is a ceramic material. System design ensures that the user sees only cool surfaces.

A solid oxide fuel cell is made up of four layers, three of which are ceramics. Reduction of oxygen into oxygen ions occurs at the cathode. These ions then diffuse through the solid oxide electrolyte to the anode where they electrochemically oxidize the fuel.

The fuel which can be used are   In this reaction, a water byproduct is given off as well as two electrons. These electrons then flow through an external circuit where they can do work. The cycle then repeats as those electrons enter the cathode material again.

PEMFCs consist membrane electrode assemblies (MEA) which include the electrodes, electrolyte, catalyst, and gas diffusion layers. An ink of catalyst, carbon, and electrode are sprayed onto the solid electrolyte and carbon paper is hot pressed on either side to protect the inside of the cell and also act as electrodes. The pivotal part of the cell is the triple phase boundary (TPB) where the electrolyte, catalyst, and reactants mix and thus where the cell reactions actually occur.

A proton exchange membrane fuel cell convert the chemical energy liberated of electrochemical reaction of hydrogen and oxygen to electrical energy, as opposed to the direct combustion of hydrogen and oxygen gases to produce thermal energy.

Metal-organic frameworks (MOFs) are compounds consisting of metal ions or clusters coordinated to organic ligands to form 1, 2 or 3-dimensional structures. They are a subclass of coordination polymer.

MOF-210 was predicted to have hydrogen storage capacity of 2.90 by weight %.

there are many such for hydrogen storage eg

M2(dobpdc)