Electrocatalytic oxidation of dimethyl ether
- 化学化工－已发表论文 
As potential fuel for solid oxide fuel cells, electrocatalytic oxidation of dimethyl ether (DME) was studied on nickel and nickel-samarium-doped CeO2 composite anodes supported on series lanthanum gallate electrolytes. The reaction was characterized in a single solid oxide fuel cell, and the electrolytes were La0.8Sr0.2Ga0.8Mg0.11Co0.09O3(LSGMC9), Lao(0.8)Sr(0.2)Ga(0.8)Mg(0.13)Co(0.07)O(3)(LSGMC7), La0.8Sr0.2Ga0.8Mg0.15Co0.05O3(LSGMC5), and La0.9Sr0.1Ga0.8Mg0.2O3(LSGM). The composition of composite anode was 75% Ni-25% SDC (SDC - 15% Sm3+-doped CeO2). The main products were CO, H-2 and CH4 with small amounts of CO2 and H2O. DME was decomposed into CO, H-2, and CH4 under open circuit voltage. The product distribution depended strongly on the composition of anode and electrolyte. The major reaction on Ni/LSGM was partial oxidation of DME, and significant coke deposition was observed during the reaction. With the addition of SDC into Ni anode, complete oxidation was preferred on the catalyst. The formation rate of H-2 decreased with the increase of current on Ni-SDC/LSGM, and large amount of H2O was formed in the reaction. While using Co-doped LSGM electrolytes, the major reaction changed to partial oxidation of DME, and the coke deposition was significantly decreased. The main products on Ni-SDC/LSGMC9 were CO and H-2. The special property of Co-doped LSGM electrolyte could be due to the high p-type conductivity. Ni-SDC/LSGMC is a kind of ideal anode for electrocatalytic partial oxidation of DME.