Chitosan-based solid polyelectrolyte membranes for cell application

Chitosan (N-acetylated chitin) is an alkaline polymer membrane material which is biocompatible, nontoxic, natural, environmentally friendly, and low cost. It has been widely studied for use as a polyelectrolyte material. This paper reviews the applications of chitosan-based solid polyelectrolyte membranes in fuel cells. Methods for preparing chitosan membranes are discussed which include blending, chemical derivatization, and doping with proton acids or inorganic salts. The effects of these modifications on the performance of various chitosan-based membranes are described. Some unsolved problems in proton conductivity mechanism studies are mentioned. Some directions for future research on chitosan-based membranes as a polyelectrolyte material are also suggested.