Preparation And Performance Research Of Two-dimensional Supported Palladium-based Anode Catalyst For Direct Ethanol Fuel Cell

Pd-based catalysts in direct ethanol fuel cells have the advantages of enhancing the catalytic activity of ethanol and reducing the adsorption of toxic substances from intermediates,and have attracted extensive attention from researchers.The key to the commercialization of direct ethanol fuel cells includes reducing the cost of catalyst,solving its long-term stability and intermediate poisoning problems during the catalytic reaction process,and exploring simple catalyst synthesis steps to meet the commercialization needs of social development.Due to its particularity,the commercial development of Pd-based catalysts has significantly different characteristics from ordinary Pt/C(JM)catalysts.In this paper,how to achieve the good stability and excellent anti-poisoning ability of direct ethanol fuel cell Pd-based catalyst is fully analyzed and studied.Therefore,this paper takes the existing problems of the Pd-based catalysts shown in the current research as the research direction,and conducts research on the Pd-based catalysts from the modification of the two-dimension cocatalyst and the introduction of two-dimensional structure carriers.The specific contents are as follows:(1)Co-catalyst.The addition of Sn,a non-noble metal catalyst,to direct ethanol fuel cells reduces the cost of Pd-based catalysts and modifies the electronic structure of the main catalyst element Pd.In the catalytic reaction of ethanol,the co-catalyst provides the hydroxyl groups(OHads)required for the catalytic reaction to help oxidize carbon monoxide(COads)to CO2 at a lower potential.Different systems use different reduction methods to reduce Pd-based metal nanoparticles,and adjust the ratio of supported metals to explore the effect of different ratios on catalyst performance.(2)Two-dimensional structure carrier.Two-dimensional carriers with a large specific surface area(titanium dioxide nanosheet TiO2 NSs,a two-dimensional composite carrier TiO2-GO combined with spindle titanium dioxide and graphene)were introduced to the direct ethanol fuel cell Pd-based catalyst to synthesize two systems of two-dimensional carriers.The effects of its two-dimensional carrier on the activity,stability and anti-poisoning ability of Pd-based catalysts were studied.The relationship between the loaded active ingredients and the carrier was studied through control experiments.Through the research of this subject,two problems can be solved.First,which aspects should be covered by the Pd-based catalyst to solve the commercialization of direct ethanol fuel cells.Second,how the performance of the Pd-based catalyst should be improved.