Self-Supported Pd_xBi Catalysts for the Electrooxidation of Glycerol in Alkaline Media

Abstract

Highly active self-supported PdxBi catalysts are synthesized by the sacrificial support method. Self-supported PdxBi catalysts have a porous nanostructured morphology with high surface areas (in the range from 75 to 100 m(2) g(-1)), making PdxBi a state-of-the-art catalyst. Pd4Bi displays the highest activity toward glycerol oxidation. In situ Fourier transform infrared spectroscopy highlights the unique catalytic behavior of self-supported PdxBi materials due to their particular structure and morphology. The confinement of reactants and intermediates in pores acting as nanoreactors is responsible for the high selectivity as a function of the electrode potential: aldehyde and ketone at low potentials, hydroxypyruvate at moderate potentials, and CO2 at high potentials. Moreover, the selectivity depends on the electrode history: it is different for the positive potential scan direction than for the reverse direction, where the catalyst becomes selective toward the production of carboxylates.

Highly-active Pd–Cu electrocatalysts for oxidation of ubiquitous oxygenated fuels

“…According to Simoes [64] and Zalineeva [15], the band at 1070-1100 cm −1 indicates the presence of glyceraldehyde, the formation of which is required to produce the glycerate ion [10]. The appearance of oxalate, an intermediate species involved in the EGOR [65,66], was observed at 0.57 V vs. RHE.…”

“…The activity of unsupported palladium was compared to that of family of nanostructured Pd-Cu electrocatalysts (with the ratio between Pd and Cu: 1:3, 1:1 and 3:1) synthesized by the same method. The materials were prepared using the Sacrificial Support Method (SSM) [13][14][15][16][17][18][19][20][21][22][23][24][25][26], previously developed at UNM with a modification for the preparation of unsupported platinum group metals electrocatalysts. The SSM is a powerful and flexible method, which can be adopted for the synthesis of tailored high-surface area self-supported electrocatalysts and other classes of nanostructured materials.…”

Activity Enhancement of Tetrahexahedral Pd Nanocrystals by Bi Decoration towards Ethanol Electrooxidation in Alkaline Media

“…4a) as well as an enhanced peak current. Furthermore, Bi modified Pd surface may inhibit the formation of excessive surface oxides such to prevent the deactivation of the catalyst to some extent [41].…”

Ordered Intermetallic Nanostructured PtSb/C for Production of Energy and Chemicals

“…Pt 84 Sn 16 performed the best among the assessed materials. More recently, Zalinneva et al evaluated glycerol oxidation on the surface of PdBi alloys [14]. Pd 4 Bi was the best anode as a consequence of its electronic effect.…”