PDF Publication Title:
Text from PDF Page: 115
4.2.2 Ceria/Platinum Direct methanol fuel cells (DMFCs) are a type of fuel cell that allows for the direct oxidation of methanol to carbon dioxide and reduction of oxygen to water. Although methanol has a greater energy density than hydrogen, DMFCs are limited by current membrane technology in attaining their true power density. However, they have the ability to store tremendous amounts of energy, thus making them ideal as alternative energy storage devices. The oxidation of methanol to carbon dioxide occurs at the anode and is shown in Equation 4.1. The reduction of oxygen to water occurs at the cathode and is shown in Equation 4.2. The overall reaction is shown in equation 4.3.37-39 CH3OH + H2O → CO2 + 6H+ + 6e- 3/2 O2 + 6H+ + 6e- → 3H2O CH3OH + 3/2 O2 → CO2 + 2H2O Equation 4.1 Equation 4.2 Equation 4.3 CO is a known intermediate in these reactions and will adsorb to the catalyst, typically platinum, used for the fuel cell electrodes. The CO reduces the active surface area of the catalyst which slowly reduces the performance of the fuel cell.40 In an attempt to alleviate this problem, researchers are attempting to identify materials that can be dispersed in the catalyst that will oxidize the CO instead of allowing the CO to poison the catalyst. On such material identified is ceria, a metal oxide, which can quickly switch back and forth between the +3 and +4 oxidation state, and therefore acts as an oxygen buffer.41 This helps the CO oxidize to CO2 and reduces the catalyst poisoning. Due to this, the development of a platinum and ceria matrix for the electrode in DMFCs is gaining a lot of interest in research.42 Given the ability to individually deposit both 91PDF Image | Supercritical Fluid Deposition Of Thin Metal Films
PDF Search Title:
Supercritical Fluid Deposition Of Thin Metal FilmsOriginal File Name Searched:
Supercritical-Fluid-Deposition-Of-Thin-Metal-Films-Kinetics-Mec.pdfDIY PDF Search: Google It | Yahoo | Bing
Sulfur Deposition on Carbon Nanofibers using Supercritical CO2 Sulfur Deposition on Carbon Nanofibers using Supercritical CO2. Gamma sulfur also known as mother of pearl sulfur and nacreous sulfur... More Info
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)