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

Qingnuan Zhang; Shuda Dong; Pengpeng Shao; Yuhao Zhu; Zhenjie Mu; Dafei Sheng; Teng Zhang; Xin Jiang; Ruiwen Shao; Zhixin Ren; Jing Xie; Xiao Feng; Bo Wang

doi:10.1126/science.abm6304

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

Qingnuan Zhang, Shuda Dong, Pengpeng Shao, Yuhao Zhu, Zhenjie Mu, Dafei Sheng, Teng Zhang, Xin Jiang, Ruiwen Shao, Zhixin Ren, Jing Xie, Xiao Feng^*, Bo Wang^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

206 Citations (Scopus)

Abstract

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.

Original language	English
Article number	378
Journal	Science
Volume	378
Issue number	6616
DOIs	https://doi.org/10.1126/science.abm6304
Publication status	Published - 14 Oct 2022

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title = "Covalent organic framework–based porous ionomers for high-performance fuel cells",

abstract = "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.",

author = "Qingnuan Zhang and Shuda Dong and Pengpeng Shao and Yuhao Zhu and Zhenjie Mu and Dafei Sheng and Teng Zhang and Xin Jiang and Ruiwen Shao and Zhixin Ren and Jing Xie and Xiao Feng and Bo Wang",

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AU - Zhang, Qingnuan

AU - Dong, Shuda

AU - Shao, Pengpeng

AU - Zhu, Yuhao

AU - Mu, Zhenjie

AU - Sheng, Dafei

AU - Zhang, Teng

AU - Jiang, Xin

AU - Shao, Ruiwen

AU - Ren, Zhixin

AU - Xie, Jing

AU - Feng, Xiao

AU - Wang, Bo

PY - 2022/10/14

Y1 - 2022/10/14

N2 - 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.

AB - 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.

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DO - 10.1126/science.abm6304

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

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