Abstract: Fuel cells have attracted wide attention due to the high energy conversion efficiency, near-zero pollution and low noise. Polymer electrolyte membrane (PEM) is an important component of fuel cells, its performance determines the practical output of fuel cells. To address the shortcomings of PEMs in terms of stability and ionic conductivity, inorganic nanomaterial doping is applied to PEMs as a conventional modification method. In recent years, graphitic carbon nitride (g-C3N4) has been widely used in the preparation and modification of PEMs due to its unique structural characteristics and excellent physic-chemical properties. This review mainly describes the structural properties of g-C3N4, summarizes the typical preparation methods of g-C3N4-based composite PEMs, focuses on the current research and application of g-C3N4, demonstrates its important achievements in the modification aspect, and gives an outlook on its future development in PEMs.
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