A NEW GAS DIFFUSION ELECTRODE (GDE) WITH A BETTER O2 REDUCTION ELECTROCATALYSTS WITH VERY LOW PT CONTENTS VIA NANO-SIZED PT-COATED NAFION

In the present study, a new gas diffusion electrode (gde) (based on pt/nafion membrane) isfabricated. the electrochemical results show that the new gde has the highest electrochemicalactivity toward the oxygen reduction reaction (orr) among the three electrodes. the sem and xrd findings show that a platinum layer can be attached to nafion membrane closely and firmly with a strong peak corresponding to (111) crystalline face. the results illustrate that placing a ptmonolayer on a nafion membrane is an attractive way of designing better o2 reductionelectrocatalysts with very low pt contents. under optimum conditions, tafel slope, exchangecurrent density (i0), and charge transfer resistance (rct) are obtained to be respectively equal to 85mv dec^-1, 2×10^-3 a, and 8 ω. for this electrode, the platinum particle size is 4 nm.