Manganese (II,III) Oxide‐Activated Carbon Black Supported PtRu Nanoparticles for Methanol Electrooxidation in Acid Medium

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.xMn3O4 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.10Mn3O4 followed by PtRu/70C.30Mn3O4. The bimetallic catalyst supported over 90C.10Mn3O4 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 Mn3O4 to provide a large extra amount of hydroxyl groups and promote the dehydrogenation of methanol.

Carbon-Supported Pt Nanoparticles Modified with CuO for the Electrooxidation of Glycerol in Alkaline Electrolyte

“…The carbon support material Vulcan XC-72R was oxidized by using 3.0 M HNO 3 aqueous solution at 60 °C for 180 min. The physicochemical characteristics of the functionalized carbon powder (O-Vulcan XC-72R) can be found in previous papers. − …”

“…The carbon-supported Pt–CuO( x ) electrocatalysts were synthesized by a pulsed microwave-assisted polyol method. , 100.0 mg of O-Vulcan XC-72R carbon and a certain amount of CuO powder (5, 15, and 30 wt % on carbon) were dispersed in 50 mL of ethylene glycol by sonication for 120 min. Then, the pH of the resulting dispersion was adjusted to 10 by adding 0.5 M KOH/EG solution under stirring.…”

Pt/Mn3O4 cubes with high anti-poisoning ability for C1 and C2 alcohol fuel oxidation

“…26 Moreover, the oxophilicity of Mn 3 O 4 could promote its binding of water molecules, leading to the formation of more oxygencontaining species, which can assist CO oxidation based on the bi-functional catalysis mechanism. 27,28 Therefore, the Pt-Mn 3 O 4 catalyst showed much a higher catalytic activity, stability and anti-CO poisoning ability for methanol oxidation than did the Pt/C catalyst. The electrochemical surface area (ECSA) can be calculated from the CO stripping peak, and values of 63.3 m 2 g À1 and 49 m 2 g À1 were calculated for Pt-Mn 3 O 4 and Pt/C, respectively (Table S5, ESI †).…”