Electrochemical Performance of Pt-Based Catalysts Supported on Different Ordered Mesoporous Carbons (Pt/OMCs) for Oxygen Reduction Reaction

Abstract

The present work aims to compare and evaluate the behavior of platinum catalysts supported on different ordered mesoporous carbons (Pt/OMCs). OMCs were templated from two kinds of ordered mesoporous silicas (2-D SBA-15 and 3-D SBA-16), with sucrose as carbon precursor and boric acid as a pore expanding agent. Structural characterizations revealed that all OMCs inherited the structure from silica templates. OMC synthesized from a mixture of sucrose and boric acid exhibited a larger pore size. According to XRD, TEM, and XPS analysis, particle size and distribution of Pt were influenced by the porosity of OMC supports. In single PEMFC tests, catalysts supported on OMC with a 3-D pore structure (Pt/C16sucr: 0.57 W cm–2 at 0.45 V) or with 2-D larger pores (Pt/C15sucr+B: 0.44 W cm–2 at 0.45 V) significantly enhanced the FC performance compared to Pt/C15sucr (0.29 W cm–2 at 0.45 V), which may be attributed to a better mass transfer and a higher catalytic activity. In particular, it was found that Pt/C16sucr had a catalytic behavior superior to that of the Pt/Vulcan commercial catalyst in the high potential region, suggesting that C16sucr is a promising catalyst support for PEMFC application.

Influence of thermal treatments on the stability of Pd nanoparticles supported on graphitised ordered mesoporous carbons

“…Ordered mesoporous carbons (OMCs) have received great attention due to their unique properties, they can find potential applications in several fields [33][34][35]. They present a regular structure, high surface area, large pore volume and a narrow pore size distribution [33,36].…”

Tailoring Synthesis Conditions of Carbon Xerogels towards Their Utilization as Pt-Catalyst Supports for Oxygen Reduction Reaction (ORR)

“…These results highlight the importance of support morphology and porosity on the electrochemical activity, which may result a key parameter for the operation in a fuel cell cathode [5,6]. The selected Pt-catalysts were subjected to an accelerated test procedure to evaluate catalyst stability under potential cycling conditions.…”

“…These properties are fundamental requires in the application of carbon materials as supports in the preparation of catalytic systems, especially within the field of fuel cell technologies [5,6]. In fact, depending on the application, pore size distribution can play a definitive role in catalytic activity and stability.…”

Recent Progress on the Key Materials and Components for Proton Exchange Membrane Fuel Cells in Vehicle Applications

“…To overcome the above problems, new generation electrodes, namely ordered CLs have been proposed [107], developed, widely studied in the laboratory [108][109][110][111][112][113][114][115][116][117][118][119][120][121][122][123], and even commercialized [124,125]. In this section, the recent progress in the fabrication of CLs, the efforts to resolve and optimize the microstructure, and new trends in CL designs are reviewed.…”