Li_2SO_4质子传导膜H_2S固体氧化物燃料电池研究(英文)

Investigation of H_2S Solid Oxide Fuel Cells with a Li_2SO_4-based Proton-conducting Membrane

制备和研究了具有H2S，（MoS2＋NiS＋Ag）／Lu2SO4＋Al2O3／（NiO＋Ag），air结构的H2S固体氧化物燃料电池用于产生电能和脱除燃料气体中的H2S。电池在600～650℃和大气压下运行。燃料电池的电化学性能受电解膜的组成，电极材料和操作温度影响。掺杂了Al2O3和少量H3BO4的Li2SO4质子传导膜可以提高膜的机械强度和性能，改善膜的致密性和电池的性能。适宜的Li2SO4和Al2O3比为3～4：1（质量比），适宜掺杂H3BO4的量为2％～5％（W）。掺杂了Ag粉和电解质的金属硫化物复合阳极在H2S气流下很稳定和性能很好，掺杂了Ag粉和电解质的的NiO复合阴极在去除H2S时性能优于Pt电极催化剂。在650℃电池的最大输出功率密度为70mW·cm^-2，最大电流密度为180mA·cm^-2。然而，电池长期运行的稳定性实验仍有待研究。

A H2S solid oxide fuel cell with a configuration of H2S, （MoS2 ＋ NiS＋ Ag） /Li2SO4 ＋ Al2O3/ （NiO ＋ Ag）, air was fabricated and studied for production of power and for desulfurization of a fuel gas process stream. The cell was run at typical temperatures （600 - 650 ℃ ） and ambient pressure. The electrochemical performance of a fuel cell can be limited by electrolyte membrane formula, electrode materials and operating temperatures. The Li2SO4-based proton-conducting membrane incorporating Al2O3 and little boric （ H3BO4 ） enhances mechanical and electrical properties, improves the membrane compactivity and cell performance. The suitable formula of Li2SO4 to Al2O3 is 3 - 4：1 by weight, and the suitable boric amount added is 2% - 5% （wt）, respectively. Composite anodes based on metal sulfides with Ag powder and electrolyte behaved well and stably in H2S stream, and composite cathodes based mainly on nickel oxide with Ag powder and electrolyte had superior performance to Pt catalyst for removal of H2S. The maximum power density of up to 70 mW·cm^- 2 and current density of as high as 180 mA·cm^-2 were obtained at 650 ℃. However, the long-term ceil stability remains to be investigated.