直接碳燃料电池阳极反应特性研究

Study on anode reaction characteristics of direct carbon fuel cell

直接碳燃料电池(DCFC)具有能量转化效率高、污染低、燃料来源广等突出优点,被认为是缓解能源危机和环境污染的有效途径,而固体氧化物直接碳燃料电池(SO-DCFC)因其腐蚀性小、寿命长等优点是一种具有发展潜力的燃料电池。以氧化钇稳定的氧化锆(YSZ)为电解质组装对称电池,研究操作温度、阳极燃料特性、阳极气氛等对电池性能的影响。结果表明,随着操作温度的降低,电池欧姆电阻变大,电池性能下降。阳极燃料特性是影响电池性能的关键因素,以活性炭、半焦、石墨为燃料的DCFC性能顺序为活性炭>半焦>石墨;燃料中混合碳酸盐能明显改善DCFC性能,当碳酸盐混合半焦作为燃料时,电池功率密度达到25 m W/cm2。阳极载气为CO2能促进阳极CO生成,提高电池性能,而N2载气稀释阳极反应气浓度,降低电池性能。

Due to the advantages of high energy conversion efficiency, low pollution, abundant source, the direct carbon fuel cell （DCFC） has been considered to be an efficient way to mitigate the energy crisis and environmental pollution issues, and the solid oxide DCFC （SO-DCFC） is a kind of potential fuel cells due to no corrosion and long life. DCFC was prepared with YSZ electrolyte coated silver paste as current collector on each side. The influence factors for the performance of SO-DCFC, such as operating temperature, property of fuels and atmosphere in anode, were analyzed. The results show that as the operating temperature decreases, the ohmic resistance increases, and the maximum power density reduces. With active carbon （AC）, semi-coke （SC） and graphite （G） as the fuel, DCFC performance in order is AC〉SC〉G. With the mixture of carbonate and semi-coke as the fuel, the peak power density of SO-DCFC reaches 25 mW/cm2. The carrier gas of CO2 can make CO generate in anode, improving DCFC performance. The carrier gas of N2dilutes reaction gas concentration, reducing DCFC performance.