Blocking the sulfonate group in Nafion to unlock platinum's activity in membrane electrode assemblies

被引：90

作者：

Chen, Fadong ^{[1
]}

Chen, Siguo ^{[1
]}

Wang, Aoxue ^{[2
]}

Wang, Meng ^{[1
]}

Guo, Lin ^{[2
]}

Wei, Zidong ^{[1
]}

机构：

[1] Chongqing Univ, Coll Chem & Chem Engn, State Key Lab Power Transmiss Equipment & Syst Sec, Chongqing, Peoples R China

[2] SINOPEC Res Inst Petr Proc Co, State Key Lab Catalyt Mat & React Engn, Beijing, Peoples R China

来源：

NATURE CATALYSIS | 2023年 / 6卷 / 05期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

OXYGEN REDUCTION REACTION; FUEL-CELLS; PERFORMANCE; CATALYSTS; CONDUCTIVITY; CONFINEMENT; LIMITATIONS; INSIGHTS;

D O I：

10.1038/s41929-023-00949-w

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The specific adsorption of ionomer sulfonate groups on Pt-based catalysts in membrane electrode assemblies (MEAs) has severely restricted Pt catalytic activity, Pt utilization, proton conductivity and mass transport. Here we report a blocking strategy using cyclohexanol to mitigate the detrimental impacts of the Nafion ionomer. Cyclohexanol with a chair or boat conformation blocked the adsorption path of the ionomer onto the Pt surface via coordination with the ionomer, which released the Pt activity sites and dramatically improved the mass transport path. This MEA with cyclohexanol exhibits striking performance improvement in the kinetic and mass transport regions, along with strong stability. The proposed strategy provides a direction to tune the Pt/ionomer interface and improve the catalytic activity of Pt in MEA.

引用

页码：392 / 401

页数：10

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