Ordered intermediate compound PtBi-modified Pt/C catalyst for 2-propanol electrooxidation in alkaline medium

Abstract

The PtBi-modified Pt/C catalyst was prepared by liquid chemical reduction method. X-ray diffraction and X-ray photoelectron spectroscopy (XPS) were used to characterize PtBi-modified Pt/C catalyst. The electrochemical behaviors for the 2-propanol electrooxidation reaction in alkaline medium were measured by cyclic voltammetry, line sweep voltammetry, and electrochemical impedance spectra (EIS). The results showed that the prepared PtBi is ordered intermediate compound. Compared with the spectrum obtained from Pt/C catalyst, the XPS peak of PtBi-modified Pt/C catalyst is obviously moving toward the low Pt 4f biding energy. The Bi 0 and Bi 2 O 3 coexist on the surface of PtBi/C catalyst. In alkaline medium, the electrochemical activity of 2-propanol electrooxidation of PtBi/C catalyst is higher than that of commercial Pt/C catalyst. EIS result shows that the reaction mechanism of 2-propanol electrooxidation for both catalysts is similar.

Electrochemical Energy Conversion on Intermetallic Compounds: A Review

“…It is believed that this modification is responsible for a stronger interaction between carbon and Pt, allowing for an acceleration of C–C cleavage at lower potentials, which is rate determining in the oxidation of 2-propanol. A similar explanation was brought forward for the higher activity of PtBi (NiAs type of crystal structure) compared to Pt/C in the oxidation of 2-propanol …”

“…A similar explanation was brought forward for the higher activity of PtBi (NiAs type of crystal structure) compared to Pt/C in the oxidation of 2-propanol. 327…”

Intermetallic Nanocrystals for Fuel-Cells-Based Electrocatalysis

“…406 As such, more rational designs about the special intermetallics@oxides interfaces have become high-profile. 126,795 Sn, Pb, Co) and Pd x M (M = Te, 641 Ge, 796 Sn, 797 Pb, Cu, 73 Ti, Zr, 676 Zn, Sb; x equal to 1, 2, 3), all combined with various oxyphilic elements.…”

“…Increasing involved species further bring about more irregularity as well as broader room for improvement with the original d -band structure of Pt- and Pd-based intermetallics. Many intermetallics materials have been reported in this area, representative as PtM (M = Bi, , Sn, Pb, Co) and Pd x M (M = Te, Ge, Sn, Pb, Cu, Ti, Zr, Zn, Sb; x equal to 1, 2, 3), all combined with various oxyphilic elements. Considering the potential multiple RDS, more flexible modulation of the d -band center is needed and brief discussion about the as-mentioned strategies for C2/multicarbon molecule oxidation catalysis is carried out from structural and compositional aspects, as followed.…”

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

“…In addition, the synthesis of these phases as nanoparticles enables their application in real systems. Few studies have used ordered intermetallic phases as active material in electrochemical reactions, even though this type of nanoparticles presents promising performance [15][16][17][18][19][20][21]. In particular, ordered intermetallic PtSb constitutes a potential electrocatalyst for alcohol electrooxidation [17].…”