【摘 要】
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Proton conducting solid oxide fuel cell (H-SOFC) is an emerging energy conversion device,with lower activation energy and higher energy utilization efficiency.However,the deficiency of highly active cath-ode materials still remains a major challenge for t
【机 构】
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Beijing Key Laboratory for Chemical Power Source and Green Catalysis,School of Chemistry and Chemica
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Proton conducting solid oxide fuel cell (H-SOFC) is an emerging energy conversion device,with lower activation energy and higher energy utilization efficiency.However,the deficiency of highly active cath-ode materials still remains a major challenge for the development of H-SOFC.Therefore,in this work,K2NiF4-type cathode materials Pr2-xBaxNi0.6Cu0.4O4+δ (x =0,0.1,0.2,0.3),single-phase triple-conducting (e-/O2-/H+) oxides,are prepared for intermediate temperature H-SOFCs and exhibit good oxygen reduction reaction activity.The investigation demonstrates that doping Ba into Pr2-xBaxNi0.6Cu0.4O4+δ can increase its electrochemical performance through enhancing electrical conduc-tivity,oxygen vacancy concentration and proton conductivity.EIS tests are carried at 750 ℃ and the min-imum polarization impedances are obtained when x =0.2,which are 0.068 Ω·cm2 in air and 1.336 Ω·cm2 in wet argon,respectively.The peak power density of the cell with Pr1.8Ba0.2Ni0.6Cu0.4O4+δ cathode is 298 mW·cm-2 at 750 ℃ in air with humidified hydrogen as fuel.Based on the above results,Ba-doped Pr2-xBaxNi0.6Cu0.4O4+δ can be a good candidate material for SOFC cathode applications.
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