Comprehensive understanding of oxygen transport at Gas/ionomer/electrocatalyst triple phase boundary in PEMFCs

Li, Huiyuan; You, Jiabin; Feng, Yong; Yan, Xiaohui; Yin, Jiewei; Luo, Liuxuan; He, Miaomiao; Cheng, Xiaojing; Shen, Shuiyun; Zhang, Junliang

doi:10.1016/j.cej.2023.147454

Cited by 9 publications

(1 citation statement)

References 48 publications

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“…The use of a highly active cathodic catalyst has been well demonstrated as an effective way to boost the reaction rate, thus improving fuel cell power performance. ORR in fuel cells occurs at the three-phase boundary [5] (TPB) (electrocatalyst/electrolyte/oxygen), whereas electron transfer occurs mainly through the conductive path provided by the linked catalyst nanoparticles (e.g., carbpm-supported platinum, Pt/C). Proton transfers along with the ionic conducting network built by the 2 of 11 ionomer, and gas is transported through exposed pores within the catalyst layer.…”

Section: Introductionmentioning

confidence: 99%

Ionic Liquid Modification of High-Pt-Loading Pt/C Electrocatalysts for Proton Exchange Membrane Fuel Cell Application

Cheng,

Guo,

Liang

et al. 2024

Catalysts

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Ionic liquid modification for carbon-supported platinum (Pt/C) electrocatalysts to enhance their oxygen reduction reaction (ORR) activity has been well recognized. However, the research has only been reported on the low-Pt-loading Pt/C electrocatalysts, e.g., 20 wt%, while in practical applications, usually high-Pt-loading Pt/C electrocatalysts of 45–60 wt% are used. In this work, ionic liquid modification is systematically investigated for a Pt/C electrocatalyst with 60 wt% Pt loading for its ORR activity in the cathode in proton exchange membrane fuel cells (PEMFCs). Various adsorption amounts are studied on the catalyst surface. Different modification behavior is found. Mechanism exploration shows that the adsorption of ionic liquid mainly happens on the Pt electrocatalyst surface and in the micropores of the carbon support. The highest fuel cell power performance is achieved at an ionic liquid loading of 7 wt%, which is much higher than the 3 wt% reported for the low-Pt-loading Pt/C.

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Section: Introductionmentioning

confidence: 99%