Enhancement of the Catalytic Activity and Load Cycle Durability of a PtCo Alloy Cathode Catalyst Supported on Ta-Doped SnO2 with a Unique Fused Aggregated Network Microstructure for Polymer Electrolyte Fuel Cells

2020 ◽  
Vol 3 (7) ◽  
pp. 6922-6928
Author(s):  
Katsuyoshi Kakinuma ◽  
Mizuki Hayashi ◽  
Takuma Hashimoto ◽  
Akihiro Iiyama ◽  
Makoto Uchida
Keyword(s):  
Catalytic Activity ◽  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Load Cycle ◽  
Polymer Electrolyte Fuel Cells ◽  
Cathode Catalyst ◽  
Ptco Alloy ◽  
Network Microstructure

Numerical Analysis of Silica Coating Effect on Pt Cathode Catalyst in Polymer Electrolyte Fuel Cells

2021 ◽  
Vol 54 (5) ◽  
pp. 226-231
Author(s):  
Kayoung Park ◽  
Magnus So ◽  
Masaki Goto ◽  
Sakae Takenaka ◽  
Yoshifumi Tsuge ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Numerical Analysis ◽  
Polymer Electrolyte ◽  
Silica Coating ◽  
Polymer Electrolyte Fuel Cells ◽  
Cathode Catalyst

Fabrication of Cathode Catalyst Layer By Use of Multi-Nozzle Electrospray Method on Polymer Electrolyte Fuel Cells

2021 ◽  
Vol MA2021-02 (37) ◽  
pp. 1087-1087
Author(s):  
Makoto Uchida ◽  
Kayoko Tamoto ◽  
Takumi Nagasaka ◽  
Chihiro Taguchi ◽  
Shimao Yoneyama
Keyword(s):  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Catalyst Layer ◽  
Polymer Electrolyte Fuel Cells ◽  
Cathode Catalyst ◽  
Cathode Catalyst Layer

Effectiveness factor of Pt utilization in cathode catalyst layer of polymer electrolyte fuel cells

2008 ◽  
Vol 86 (7) ◽  
pp. 657-667 ◽  
Author(s):  
Zetao Xia ◽  
Qianpu Wang ◽  
Michael Eikerling ◽  
Zhongsheng Liu
Keyword(s):  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Catalyst Layer ◽  
Polymer Electrolyte Fuel Cells ◽  
Effectiveness Factor ◽  
Cathode Catalyst ◽  
Catalyst Layers ◽  
Effectiveness Factors ◽  
Cathode Catalyst Layer ◽  
Pt Utilization

In this work, we analyze effectiveness factors of Pt utilization in perfluorosulfonate ionomer (PFSI) bonded thin film cathode catalyst layers of polymer electrolyte fuel cells. We define the effectiveness factor of Pt utilization as the apparent rate of current conversion exhibited by a specific catalyst layer design divided by the ideal rate obtained if all Pt atoms were used equally in electrochemical reactions at the specified electrode overpotential and externally provided reactant concentrations. This definition includes statistical factors at all relevant scales as well as non-uniformities of reaction rate distributions under operation. Our model is based on the random composite agglomerated morphology of the catalyst layer. It accounts for the interplay of transport phenomena and electrochemical kinetics. At the mesoscopic scale, limited effectiveness of Pt utilization in agglomerates is mainly an electrostatic effect. We determined spatial distributions of effectiveness factors of agglomerates in the through-plane direction, and thereafter calculated overall effectiveness factors of the cathode catalyst layer. Our results show that small agglomerate radius, low operating current density, high operating temperature, and high oxygen partial pressure result in high effectiveness factors of Pt utilization. Finally, we compared PFSI-bonded thin film cathode catalyst layers with ultrathin two-phase cathode catalyst layers in terms of effectiveness factors. Including the surface to volume atom ratio of Pt nanoparticles, the two different types of structures exhibit similar effectiveness factors of Pt utilization, which are found to be distinctly below 10%.Key words: polymer electrolyte fuel cells, fuel cell modeling, cathode catalyst layer, Pt utilization, effectiveness factor.

Sign in / Sign up

Export Citation Format

Share Document