RT Conference Proceedings
T1 Electrochemical behavior of pt- a d pd-supported activated carbons with different functionalities
A1 Gallardo-Fuentes, Aurora
A1 Berenguer-Betrián, Raúl
A1 Nishihara, Hirotomo
A1 Kyotani, Takashi
A1 Rodríguez-Mirasol, José
A1 Cordero-Alcántara, Tomás
K1 Carbón activado
K1 Catálisis
K1 Oxidación electroquímica
AB Due to their relatively low price, high surface area and versatile physic-chemical properties,conductive carbon materials are considered among the most promising supports of electroactivespecies and/or catalysts for different electrochemical devices, like supercapacitors, fuel cells,batteries, sensors, etc. [1]. However, in these applications, carbon supports are usually subjected tooxidation and/or corrosion processes, which can be promoted by the supported electroactive speciesand/or catalysts [2]. In this sense, although the surface functionalities of carbons seem to play a keyrole on their electrochemical response and stability, their influence in the presence of electroactivecatalysts is still controversial. Particularly, the effect of phosphorous groups has been neverreported. In this work, the influence of different oxygen and phosphorous functionalities on theelectrochemical behavior of Pt- and Pd-supported activated carbons (ACs) has been studied.Various ACs showing similar surface areas (ca. 1400-1500 m2/g) and a rich variety of surfacechemistry, with oxygen and phosphorous-like surface groups, were obtained by physical (CO2)(HAG800 support) or chemical(H3PO4) (HA3500 support)activation of olive stone. TheACs were used as support ofPd, Pt and Pd/Pt catalysts (Fig1a), with nominal loadings of0.5-1.0 wt%, by using theincipient-wetting impregnationmethod. The samples werecharacterized by N2 and CO2adsorption, TEM, XRD, XPS,TPD experiments and differentelectrochemical techniques.Although the supported metalspromote carbon electroxidation and/or corrosion (see the higher oxidation currents for the metalloadedsample – Fig 1b), the presence of surface phosphorous groups (HA3500-M samples) resultsin lower oxidation currents than in the case of P-free samples (HAG800-M samples) (Fig. 1.b).These results are in agreement with the oxidation resistance induced by phosphorous groups inoxidizing gas phase at high temperatures [3], and may support the statement that these phosphorousgroups could enhance the durability of carbon-supported metal electrocatalysts for differentelectrochemical applications.
YR 2014
FD 2014-07-28
LK http://hdl.handle.net/10630/7940
UL http://hdl.handle.net/10630/7940
LA eng
NO Universidad de Málaga. Campus de Excelencia Andalucía Tech.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026