磷钨酸
共价有机骨架
Nafion公司
膜
共价键
质子交换膜燃料电池
化学工程
纳米复合材料
电导率
质子
质子输运
材料科学
膜电极组件
高分子化学
化学
电极
纳米技术
有机化学
电化学
电解质
催化作用
物理化学
生物化学
工程类
物理
量子力学
作者
Shaoxiong Zhai,Zhongrui Lu,Yuna Ai,Xiaoyang Jia,Yongrong Yang,Xin Liu,Miao Tian,Xingming Bian,Jun Lin,Shaojian He
标识
DOI:10.1016/j.jpowsour.2022.232332
摘要
The performance deterioration of the proton exchange membranes (PEMs) under low humidity is one of the key issues hindering the further development of PEM fuel cells (PEMFCs). Covalent organic frameworks (COFs) offer the possibility of facilitating proton transport due to their structural advantages such as ordered pore networks and tunable functionalities. In this work, we have applied a hydrothermal method to synthesize the phosphotungstic acid (HPW) functionalized covalent organic framework (COF) nanohybrids (P–COF), in which the HPW is immobilized within the cavities of COF through the chemical bonds. The strong acidity of HPW and the ordered structure of P–COF facilitates the fast and efficient proton conduction in the Nafion/P–COF nanocomposite membranes, resulting in superior proton conductivity along with outstanding performance in H2/O2 PEMFCs under low humidity. At 25 °C under 55% RH, the proton conductivity of Nafion nanocomposite membrane with 4 wt% P–COF (Nafion/P–COF-4) reaches a proton conductivity of 0.061 S cm−1, which is 307% higher than that of the recast Nafion. The membrane electrode assembly (MEA) based on Nafion/P–COF-4 membrane exhibits excellent performance in a H2/O2 fuel cell, achieving the peak power density of 724 mW cm−2 at 80 °C and 50% RH, 138% higher than the MEA based on the recast Nafion.
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