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Impact Factor:

4.1

DOI number:

10.1016/j.ces.2024.120590

Journal:

Chemical Engineering Science

Key Words:

Proton exchange membrane fuel cell; Catalyst durability; Nanoparticle kinetics; Particle size distribution; Population balance equation

Abstract:

Electrochemically active surface area (ECSA) loss is the main cause of proton exchange membrane fuel cell performance degradation. It involves interactions between kinetics of Pt particle size distribution (PSD) and several degradation mechanisms, including particle dissolution, redeposition, coagulation and detachment from carbon support. A population balance equation was established to relate the PSD evolutions with the loss of ECSA. Dimensionless Damkohler ¨ numbers (Dardp, Dacgl, Dadet) were defined to characterize the relative magnitudes between different degradation rates. Systematic studies revealed the dimensionless transition criterions form dissolution limit to other degradation modes. Sensitivity analysis indicated the redisposition rate and dissolution rate were the two most influential parameters. The initial parameters, rather than the initial function type of the unimodal distribution, is the dominating factors for PSD degradation process. This study provides theoretical foundation for optimization of catalyst layer design and durability.

Indexed by:

Journal paper

Correspondence Author:

Yujie Ding

Discipline:

Engineering

First-Level Discipline:

Chemical Engineering and Technology

Document Type:

J

Volume:

300

Page Number:

120590

Translation or Not:

no

Date of Publication:

2024-01-01

Included Journals:

SCI