电解
气泡
气体扩散
质子交换膜燃料电池
化学
扩散
电解水
膜电极组件
水运
化学工程
聚合物电解质膜电解
电极
膜
分析化学(期刊)
材料科学
机械
水流
色谱法
热力学
环境工程
环境科学
电解质
物理化学
物理
工程类
生物化学
作者
Birou Huang,Xiaochen Wang,Wenzheng Li,Wenwen Tian,Liang Luo,Xiaoming Sun,Gongwei Wang,Lin Zhuang,Li Xiao
标识
DOI:10.1002/anie.202304230
摘要
At high current densities, gas bubble escape is the critical factor affecting the mass transport and performance of the electrolyzer. For tight assembly water electrolysis technologies, the gas diffusion layer (GDL) between the catalyst layer (CL) and the flow field plate plays a critical role in gas bubble removal. Herein, we demonstrate that the electrolyzer's mass transport and performance can be significantly improved by simply manipulating the structure of the GDL. Combined with 3D printing technology, ordered nickel GDLs with straight-through pores and adjustable grid sizes are systematically studied. Using an in situ high-speed camera, the gas bubble releasing size and resident time have been observed and analyzed upon the change of the GDL architecture. The results show that a suitable grid size of the GDL can significantly accelerate mass transport by reducing the gas bubble size and the bubble resident time. An adhesive force measurement has further revealed the underlying mechanism. We then proposed and fabricated a novel hierarchical GDL, reaching a current density of 2 A/cm2 at a cell voltage of 1.95 V and 80 °C, one of the highest single-cell performances in pure-water-fed anion exchange membrane water electrolysis (AEMWE).
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