CRISAFULLI, R.ANTONIASSI, R.M.OLIVEIRA NETO, A.SPINACE, E.V.2014-12-302014-12-302014CRISAFULLI, R.; ANTONIASSI, R.M.; OLIVEIRA NETO, A.; SPINACE, E.V. Acid-treated PtSn/C and PtSnCu/C electrocatalysts for ethanol electro-oxidation. <b>International Journal of Hydrogen Energy</b>, v. 39, n. 11, p. 5671-5677, 2014. DOI: <a href="https://dx.doi.org/10.1016/j.ijhydene.2014.01.111">10.1016/j.ijhydene.2014.01.111</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/23210.0360-3199http://repositorio.ipen.br/handle/123456789/23210PtSn/C with Pt:Sn atomic ratio of 50:50 and PtSnCu/C electrocatalysts with different Pt:Sn:Cu atomic ratios were prepared using NaBH4 as reducing agent and carbon black Vulcan XC72 as support. In a second step, the electrocatalysts were treated with nitric acid to remove the less noble metals (chemical dealloying). The obtained materials were characterized by X-ray diffraction, EDX analysis, TEM images with EDX scan-line and cyclic voltammetry. The electro-oxidation of ethanol was studied by chronoamperometry and on single direct ethanol fuel cell (DEFC). The X-ray diffractograms of the as-synthesized electrocatalysts showed the typical face-centered cubic (FCC) structure of Pt alloys. After acid treatment the FCC structure was maintained and Sn and Cu atoms were removed from the nanoparticles surface. Chronoamperometry measurements showed a strong increase of performance of PtSn/C and PtSnCu/C electrocatalysts after acid treatment; however, under DEFC conditions at 100 C, only acid-treated PtSn/C electrocatalyst showed superior performance compared to commercial PtSn/C from BASF.5671-5677openAccessborohydridescarboncopperdissolutionelectrocatalystsethanolfuel cellsoxidationplatinumreductiontintransmission electron microscopyx-ray diffractionnitric acidvoltametrychemical analysisArtigo de periódico113910.1016/j.ijhydene.2014.01.111https://orcid.org/0000-0002-7011-8261https://orcid.org/0000-0002-9287-6071