Manganese (II, III) Oxide‐Activated Carbon Black Supported PtRu Nanoparticles for Methanol Electrooxidation in Acid Medium. Issue 15 (16th May 2018)

• Record Type: Journal Article
• Authors: Comignani, Vanina; Sieben, Juan M.; Brigante, Maximiliano E.; Duarte, Marta M. E.
• Is Part Of: ChemElectroChem. Volume 5:Issue 15(2018)
• Page Start: 2118
• Page End: 2125
• Publication Date: 2018-05-16
• Subjects: Electrochemistry -- materials science -- methanol electrooxidation -- nanoparticles -- supported catalysts; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201800413
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: In this work, PtRu nanoparticles supported on hybrid manganese (II, III)‐carbon composites were prepared by a microwave‐assisted polyol process in ethylene glycol. The obtained PtRu/(100‐x) C.xMn3 O4 catalysts were characterized by XRD diffraction, TEM, SEM‐EDX analysis, ICP‐AES and electrochemical techniques. Small and well‐distributed nanoparticles of about 2.6 nm were obtained over the hybrid support. The as‐prepared catalysts presented similar Pt : Ru atomic ratio (ca. 3.4 : 1), indicating that the composition of the bimetallic system is unaffected by the oxide content in the hybrid support. However, the noble metal loading increased with the increase in the oxide content due to the formation of more nucleation sites during microwave heating. The electrochemical experiments showed that the best performance and the lowest poisoning rate are obtained with PtRu/90C.10Mn3 O4 followed by PtRu/70C.30Mn3 O4 . The bimetallic catalyst supported over 90C.10Mn3 O4 exhibited a steady current density of 215 mA mgPtRu −1 at 0.5 V, which is 40 % higher than that of PtRu/C. This behavior is mainly associated with the ability of Mn3 O4 to provide a large extra amount of hydroxyl groups and promote the dehydrogenation of methanol. Abstract : Activated support : PtRu nanoparticles on hybrid manganese (II, III) oxide‐carbon supports are prepared as methanol oxidation catalysts by a microwave‐assisted process in ethylene glycol. Characterization of the materials shows an increase in noble metal loading with the increase in oxide content due to the formation of more nucleation sites. In electrochemical experiments, a steady current density 40 % higher than that of PtRu/C is found.