Covalent organic framework-based porous ionomers for high-performance fuel cells

被引：181
|
作者：
Zhang, Qingnuan [1 ]
Dong, Shuda [1 ]
Shao, Pengpeng [1 ]
Zhu, Yuhao [1 ]
Mu, Zhenjie [1 ]
Sheng, Dafei [1 ]
Zhang, Teng [1 ]
Jiang, Xin [2 ]
Shao, Ruiwen [3 ]
Ren, Zhixin [1 ]
Xie, Jing [1 ]
Feng, Xiao [1 ]
Wang, Bo [1 ]
机构：
[1] Beijing Inst Technol, Adv Technol Res Inst Jinan, Sch Chem & Chem Engn, Beijing Key Lab Photoelect Electrophoton Con, Beijing 100081, Peoples R China
[2] China Japan Friendship Hosp, Dept Orthopaed, Beijing 100081, Peoples R China
[3] Beijing Inst Technol, Sch Med Technol, Beijing Adv Innovat Ctr Intelligent Robots & Syst, Beijing 100081, Peoples R China
来源：
SCIENCE | 2022年 / 378卷 / 6616期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
OXYGEN REDUCTION REACTION; SULFONIC-ACID IONOMERS; LAYER; CATALYSTS;
D O I：
10.1126/science.abm6304
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Lowering platinum (Pt) loadings without sacrificing power density and durability in fuel cells is highly desired yet challenging because of the high mass transport resistance near the catalyst surfaces. We tailored the three-phase microenvironment by optimizing the ionomer by incorporating ionic covalent organic framework (COF) nanosheets into Nafion. The mesoporous apertures of 2.8 to 4.1 nanometers and appendant sulfonate groups enabled the proton transfer and promoted oxygen permeation. The mass activity of Pt and the peak power density of the fuel cell with Pt/Vulcan (0.07 mg of Pt per square centimeter in the cathode) both reached 1.6 times those values without the COF. This strategy was applied to catalyst layers with various Pt loadings and different commercial catalysts.
引用
收藏
页码：181 / +
页数：6
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