材料科学
电极
电解质
电化学
阴极
磷酸
化学工程
多孔性
聚合物
静电纺丝
功率密度
复合材料
纳米技术
化学
功率(物理)
物理
物理化学
量子力学
工程类
冶金
作者
Zinan Zhang,Zhangxun Xia,Jicai Huang,Fenning Jing,Xiaoming Zhang,Huanqiao Li,Suli Wang,Gongquan Sun
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2023-01-27
卷期号:9 (4)
被引量:2
标识
DOI:10.1126/sciadv.ade1194
摘要
Ultrahigh mass transport resistance and excessive coverage of the active sites introduced by phosphoric acid (PA) are among the major obstacles that limit the performance of high-temperature polymer fuel cells, especially compared to their low-temperature counterparts. Here, an alternative strategy of electrode design with fibrous networks is developed to optimize the redistribution of acid within the electrode. Via structural tailoring with varied electrospinning parameters, uneven migration of PA with dispersed droplets is observed, subverting the immersion model of conventional porous electrode. Combining with experimental and calculation results, the microscaled uneven PA interfaces could not only provide extra diffusion pathways for oxygen but also minimize the thickness of PA layers. This electrode architecture demonstrates enhanced electrochemical performance of oxygen reduction within the PA phase, resulting in a 28% enhancement of the maximum power density for the optimally designed electrode as cathode compared to that of a conventional one.
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