Composites Part B: Engineering ( IF 13.1 ) Pub Date : 2020-09-04 , DOI: 10.1016/j.compositesb.2020.108405 Lakshya Mathur , In-Ho Kim , Aman Bhardwaj , Bhupendra Singh , Jun-Young Park , Sun-Ju Song
Lowering the operating temperature of solid-electrolyte based fuel cells is an attractive approach to achieve highly efficient energy conversion devices for the next-generation demands. The present work aims to develop proton-conducting electrolyte materials for low-temperature fuel cells. In this regard, a host matrix of gadolinium-doped cerium pyrophosphate (CGP) has been reinforced by cesium pentahydrogen diphosphate (CPP) to deliver dense electrolyte material. The composite electrolyte materials were formulated with different compositions and examined for the phase purity, sinterability, functional group, and electrical conductivities. It was found that the reinforcement by CPP assisted formation of a core-shell structure, which accelerated the proton migration by the acidic dissolution of proton into the shell. This acidic dissolution fastens the kinetics of hydrolysis of the electrolyte resulting in a maximum ionic conductivity of about 9 mS cm−1 at 110 °C under humidified air (pH2O = 0.12 atm) atmosphere. Besides, a maximum ionic conductivity of 0.8 mS cm−1 was also achieved at 230 °C under dry air atmosphere. Moreover, the entire composite electrolytes realized a remarkable densification (>95%) which substantiate the practical suitability of the presented materials to be used for the low-temperature fuel cells.
中文翻译:
用于低温燃料电池的新型磷酸盐基复合电解质的结构和电性能
降低基于固体电解质的燃料电池的工作温度是获得满足下一代需求的高效能量转换装置的一种有吸引力的方法。本工作旨在开发用于低温燃料电池的质子传导电解质材料。在这方面,g掺杂的焦磷酸铈(CGP)的基质已被二磷酸五氢铯(CPP)增强,以输送致密的电解质材料。用不同的组成配制复合电解质材料,并检查相纯度,可烧结性,官能团和电导率。已经发现,通过CPP进行的增强辅助了核-壳结构的形成,该核-壳结构通过质子向壳中的酸性溶解而加速了质子迁移。-1在110°C的湿空气(pH 2 O = 0.12 atm)气氛下。此外,在230℃下在干燥空气气氛下也实现了0.8mScm -1的最大离子电导率。而且,整个复合电解质实现了显着的致密化(> 95%),这证实了所提出的用于低温燃料电池的材料的实际适用性。