While the fuel cell is widely recognised as an eco-friendly electrochemical conversion system, its performance is strongly dependent upon the efficiency of the electrolyte, which is a highly porous material for regulating charge transport between the anode and the cathode. By far the PEM (proton exchange membrane) fuel cell has been regarded as the most promising technology for commercial implementation in the transportation sector. In order to boost the efficiency of PEM fuel cells, intense research therefore lies in the discovery and development of smart electrolyte membranes with high proton (Hz) conductivity. For a comprehensive list of proton conducting MOFs that have been reported up to ,2012, the reader may consult recent reviews given in Refs. 16 and 30. Below we highlight a number of notable examples that have emerged only recently