ASSUMPCAO, MONICA H.M.T.SILVA, SIRLANE G. daSOUZA, RODRIGO F.B. deBUZZO, GUILHERME S.SPINACE, ESTEVAM V.OLIVEIRA NETO, ALMIRSILVA, JULIO C.M.2014-07-312014-07-312014-07-312014-07-312014ASSUMPCAO, MONICA H.M.T.; SILVA, SIRLANE G. da; SOUZA, RODRIGO F.B. de; BUZZO, GUILHERME S.; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR; SILVA, JULIO C.M. Direct ammonia fuel cell performance using PtIr/C as anode electrocatalysts. <b>International Journal of Hydrogen Energy</b>, v. 39, p. 5148-5152, 2014. DOI: <a href="https://dx.doi.org/10.1016/j.ijhydene.2014.01.053">10.1016/j.ijhydene.2014.01.053</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/8543.0360-3199http://repositorio.ipen.br/handle/123456789/8543Direct ammonia fuel cell (DAFC) performance was investigated using as anode PtIr/C electrocatalysts (Pt:Ir atomic ratios of 50:50, 70:30, 80:20 and 90:10) prepared by the borohydride reduction process and NH4OH 1.0, 3.0 and 5.0 mol L 1 in KOH 1.0 mol L 1 as fuel. Xray analyses of PtIr/C electrocatalysts suggested the formation of PtIr alloy and the transmission electron micrographs showed the average particle diameters between 4.5 and 6.0 nm. Using PtIr/C 50:50 electrocatalyst and NH4OH 5.0 mol L 1 in KOH 1.0 mol L 1 at 40 C a maximum power density was 48% and 70% higher than that obtained using Pt/C and Ir/C electrocatalysts, respectively. The increase of electroactivity using PtIr/C electrocatalysts might be related to a decrease of poisoning on catalyst surface by Nads species and to an improved kinetic for ammonia oxidation reaction.5148-5152openAccessammoniafuel cellselectrocatalystsanodesplatinumiridiumcarbonfuel cellsArtigo de periódico3910.1016/j.ijhydene.2014.01.053https://orcid.org/0000-0002-9287-6071https://orcid.org/0000-0002-7011-8261