In contrast, the cathode catalyst layers were pre- pared from the CB-supported Pt catalyst (c-Pt/CB), GCB-supported Pt catalyst (c-Pt/GCB), AB800-supported Pt catalyst (n-Pt/AB800) and AB250-supported Pt catalyst (n-Pt/AB250) with a short-side- chain (SSC) ionomer (Aquivion™ D70-20BS, equivalent weight (EW) ¼ 700 ± 20 g eq 1, ion exchange capacity (IEC) ¼ 1.43 ± 0.04 meq g 1, Solvay-Solexis).