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In Situ Exsolved Ni Nanoparticles From Pr0.5Sr0.5Ti0.5Mn0.5O3 with Varying Ni Doping Levels for Direct Methane Solid
Fangjie Liu1, Shiji Xue1, Haizhao Li1
1College of Vehicle and Traffic Engineering, Henan University of Science and Technology, Luoyang, China.
None:
Methane (CH4), with abundant reserves and mature infrastructure, is an attractive fuel for solid oxide fuel cells (SOFCs). In this work, the effects of Ni doping on the electrochemical performance of Pr0.5Sr0.5Ti0.5Mn0.5O3 (PSTM)-based anodes were investigated using Pr0.5Sr0.5Ti0.5Mn0.4Ni0.1O3 (PSTMN41) and Pr0.5Sr0.5Ti0.5Mn0.5Ni0.1O3 (PSTMN51). Ni incorporation and subsequent H2 reduction generated highly dispersed Ni nanoparticles and abundant oxygen vacancies, enhancing electron transport and methane conversion. PSTMN41 exhibited superior catalytic activity and stability compared to PSTMN51 in humidified CH4. The PSTMN41-based cells achieved peak power densities of 119.6 and 60.7 mW·cm- 2 under H2 and humidified CH4 at 850°C, with polarization resistances of 1.7 and 2.44 Ω·cm2. Moreover, PSTMN41 maintained excellent stability over 120 h continuous operation in humidified CH4. These results demonstrate that PSTMN41, featuring Ni nanoparticles and high oxygen vacancy concentration, is a promising anode material for SOFCs.
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