CAJ | 학술논문

研制兼具较高化学耐久性和质子电导率的电解质是提高燃料电池效率的关键. 本研究在利用溶胶凝胶法制备磷硅酸盐干凝胶的基础上, 发现添加Ce(SO_4)_2能明显提高凝胶的质子电导率, 并且Ce(SO_4)_2含量为0.81wt%时达到最大值(σ_(100)=1.25S/m, σ_(130)=2.11S/m). 与未添加任何Ce(SO_4)_2的干凝胶相比, 质子电导率提高了70%以上. 干燥的氩气环境使凝胶的电导率下降约20%(σ_(100)=1.06S/m, σ_(130)=1.68S/m). 热分析以及NMR谱测试结果表明:添加Ce(SO_4)_2后材料的水分子保持能力增强, 形成了较多有利于质子传输的PO_4~(3-)孤立磷酸单元以及含有一个桥氧的Si-O-P和P-O-P结构单元.
연제겸구교고화학내구성화질자전도솔적전해질시제고연료전지효솔적관건. 본연구재이용용효응효법제비린규산염간응효적기출상, 발현첨가Ce(SO_4)_2능명현제고응효적질자전도솔, 병차Ce(SO_4)_2함량위0.81wt%시체도최대치(σ_(100)=1.25S/m, σ_(130)=2.11S/m). 여미첨가임하Ce(SO_4)_2적간응효상비, 질자전도솔제고료70%이상. 간조적아기배경사응효적전도솔하강약20%(σ_(100)=1.06S/m, σ_(130)=1.68S/m). 열분석이급NMR보측시결과표명:첨가Ce(SO_4)_2후재료적수분자보지능력증강, 형성료교다유리우질자전수적PO_4~(3-)고립린산단원이급함유일개교양적Si-O-P화P-O-P결구단원.
Preparation of proton conductors with good chemical durability and high proton conductivity is prerequisite for increasing efficiency of medium temperature fuel cells. In this research, new type of proton conductors were synthesized by adding Ce(SO_4)_2 to the phosphosilicate gels through sol-gel process. The results prove that adding Ce(SO_4)_2 can apparently increase proton conductivity of the gels, which reaches the maximum conductivity with the Ce(SO_4)_2 content of 0.81%, i.e. σ_(100)=1.25S/m, σ_(130)=2.11S/m. These values are 70% higher than those without adding Ce(SO_4)_2. The proton conductivity of the gels will decrease by 20% in dry argon atmosphere, that is, σ_(100)=1.06S/m, σ_(130)=1.68S/m. Thermal analysis reveals that introduction of Ce(SO_4)_2 results in an increase in water-retention ability of the gels. Furthermore, NMR spectra indicate that there forms more PO_4~(3-) isolated phosphate structure units containing no bridge-oxygen (Q~0) and Q~1 structure units containing one bridge-oxygen like SiOP and POP in the Ce(SO_4)_2-containing gels. These structure units are favorable to proton transportation, which increase the proton conductivity of the gels.