Synthesis and characterization of Pt-HxMoO3 catalysts for CO-tolerant PEMFCs

Catalysis Today. 2022. Vol. 388-389. P. 147–157.

Kurdin K., Kuznetsov V., Vitaly V. Sinitsyn, Galitskaya E., Filatova E.

Two relatively simple synthetic procedures were developed for the synthesis of Pt–HxMoO3 composites. The
obtained materials may be of interest as CO-tolerant catalysts for hydrogen-air fuel cells with proton-exchange
membranes (PEMFCs). The first step of both syntheses was to prepare hydrogen molybdenum bronzes (HxMoO3)
through the addition of Zn powder to acidic solutions containing Mo(VI) species. Two types of hydrogencontaining
molybdenum bronzes were synthesized, namely, red bronze (x≈1.55) and green bronze (x≈2.0).
The next step was the Pt deposition in a redox reaction between HxMoO3 and potassium tetrachloroplatinate
(K2PtCl4) under open-circuit conditions that resulted in composite materials defined by aPt⋅b(HxMoO3).
Numerous physical methods, including XRD, STEM, SEM, and XPS, were used to determine both the
composition and structure of the catalysts. Platinum clusters were distributed over the surface of catalytically
active support (HxMoO3) in both cases; however, the type of molybdenum bronze used for synthesis affects the
size of Pt particles.

Keywords: катализаторы, водородная энергетика, hydrogen energy, Catalyst