Metal-organic frameworks (MOFs), also called porous coordination networks (PCNs), are new types of porous crystalline materials, which have quite a few advantages, such as the structural design, functional modification of pore walls, high crystallinity, large specific surface area and excellent conductivity. It has attracted great attention in energy conversion and storage. This paper describes in detail the research of the new MOFs-based proton conductors and the electrocatalyst in the field of fuel-cell, and also concludes some important progress in MOFs-based proton exchange membrane and oxygen-reduction electrocatalyst. For example, the conductivity of one kind of MOFs proton exchange membrane can be as high as 1.82 S·cm^-1 (70℃, 90% RH). A membrane electrode assembly (MEA) using the electrocatalyst with MOFs at the cathode can produce a peak power density of 0.91 W·cm^-2. This paper also points out the deficiencies in this field, which provides new approaches for the development of high conductive proton exchange membrane and high catalytic activity electrocatalys in the future.
Contents
1 Introduction
2 Study of MOFs in proton exchange membranes
2.1 MOFs proton conductivity mechanism
2.2 Proton conductivity of MOFs in water system
2.3 Proton conductivity of MOFs in nonaqueous conditions
3 Study of MOFs on oxygen reduction (ORR) electrocatalysts
3.1 Non-precious metal ORR catalysts based on MOFs
3.2 Non-metallic ORR catalysts based on MOFs
4 Conclusion and outlook