Abstract
Metal nanocatalysts, as the anodic materials, have become increasingly important in fuel cells, due to their unique physical and chemical properties. Here, the porous silica was employed as a hard template to prepare the ordered mesoporous carbon (CMK-3). The as-prepared CMK-3 has a large surface area of 877 m 2 /g and the hierarchical porous structure with the pore size distribution centered at 3.7 nm. The CMK-3 supported silver nanocatalysts have been prepared through the wet chemical reduction by using the reduction of formaldehyde. The electrochemical properties of the Ag/CMK-3 nanocatalysts for formaldehyde oxidation are studied by cyclic voltammerry (CV) and chronoamperometric curves (i-t) in alkaline aqueous solutions. The results show that the peak current density (CV) of the Ag/CMK-3 electrode is 112 mA/cm 2 , above 2 times higher than that of Ag/XC-72 at the same Ag loading (14.15 μg/cm 2 ). Furthermore, i-t curves demonstrate that the Ag/CMK-3 nanocatalysts are efficient and stable electrocatalysts for anodic oxidation of formaldehyde in alkaline solutions. Therefore, Ag/CMK-3 nanocatalysts with the improved electrocatalytic activity suggest their application potential towards fuel cells and sensors.
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