Preparation Of PD-NI/C Anode Catalyst By Reduction Method And Its Properties

Direct ethanol fuel cell?DEFC?uses ethanol as fuel,and ethanol is widely used as renewable energy,Meanwhile DEFC in size,energy density and working environment than other fuel cells have a distinct advantage,has attracted much attention.Electrocatalyst is one of the key materials for fuel cells,the most widely used is carbon based platinum?Pt/C?catalyst,however,due to the high price of the catalyst and the shortage of resources seriously restricted the promotion of fuel cell.Therefore,the development of new low-cost,high catalytic performance and high stability of the catalyst become the focus of research.Palladium?Pd?was more abundant in nature than in Pt,and it showed higher electrocatalytic activity for ethanol oxidation in alkaline medium.This paper was prepared by dipping a total reduction of the Pd-based anode catalyst,mainly on activated carbon pretreatment,metal precursor Influence order of Pd-Ni/C alloy catalyst performance.The results show that,by using a solution of HNO₃ pretreatment XC-72 active carbon,activated carbon can be increased pore structure of the layer,the specific surface area of activated carbon is increased,increase catalyst loading,in the electrochemical test load on the pretreated activated carbon the catalyst can exhibit higher catalytic performance,and cyclic voltammetry?CV?of ethanol oxidation peak is untreated activated carbon as the catalyst carrier of 2.04 times.By using isopropyl alcohol as a solvent,sodium citrate as the stabilizer and NaBH₄ as reducing agent to prepare a catalyst PdNi,through physical and electrochemical characterization revealed that the experimental scheme can be a good synthesis of the catalyst particle size up to about 3nm,and in the electro-catalytic performance test alkaline environment exhibit high catalytic activity and stability of ethanol oxidation.Also use a stepwise reduction method Pd_ceoeNi_shell/C and Ni_corePd_shell/C catalyst,can achieve high loadings on activated carbon catalyst and a smaller particle size,and with a more high poisoning resistance.