The present invention provides, as an electrolyte which is useful as a material for a proton conductive membrane in a solid polymer fuel cell utilizing a gas fuel such as hydrogen gas or a liquid fuel such as methanol or dimethyl ether and which has higher proton conductivity than the conventional electrolytes do, an electrolyte characterized by containing an oxocarbon molecule, wherein the oxocarbon molecule has a difference in heat of formation ΔE defined as:
ΔE = E2-E1 (kcal/mol) satisfying the range of: ΔE<-70 (kcal/mol),
wherein E1 (kcal/mol) is a heat of formation in the state where a hydrogen ion is non-dissociated, and E2 (kcal/mol) is a heat of formation in the state where a hydrogen having the lowest dissociation energy in the molecule ion is dissociated, both being calculated in regard to the stabilized molecular structure in accordance with a molecular orbital method.
本发明提供了一种电解质,作为利用气体燃料(如
氢气)或液体燃料(如
甲醇或二
甲醚)的固体聚合物燃料电池中质子传导膜的材料,该电解质比传统电解质具有更高的质子传导性,其特征在于含有氧化碳分子,其中氧化碳分子的形成热差值ΔE定义为:ΔE=E2-E1(千卡/摩尔),ΔE<-70(千卡/摩尔),ΔE<-70(千卡/摩尔),ΔE<-70(千卡/摩尔),ΔE<-70(千卡/摩尔):
ΔE=E2-E1(千卡/摩尔),满足:ΔE<-70(千卡/摩尔)的范围、
其中,E1(千卡/摩尔)是氢离子未离解状态下的形成热,E2(千卡/摩尔)是分子离子中离解能最低的氢离解状态下的形成热,二者都是根据分子轨道法计算的稳定分子结构。