Heterogeneous Cell Performance of Polymer Electrolyte Fuel Cell at High Current Operation: Respiratiomode as Non-Equilibrium Phenomenon

Satoshi, Koizumi and Satoru, Ueda and Putra, Ananda and Yasuyuki, Tsursumi (2019) Heterogeneous Cell Performance of Polymer Electrolyte Fuel Cell at High Current Operation: Respiratiomode as Non-Equilibrium Phenomenon. AIP Advances, 9 (6).

[img]
Preview
Text
6_TURNITIN Heterogeneous cell performance of polymer electrolyte fuel cell at high current operation_ Respiration mode as non-equilibrium phenomenon.pdf

Download (3MB) | Preview

Abstract

The heterogeneous performance of polymer electrolyte fuel cell in space and time was discussed for operation at high current density. The cell voltage, detected by a segmented electrode, varies along a gas flow channel from upper to bottom stream and oscillates in time, which is referred as a respiration mode. At the higher current, the cell voltage at different positions started to be synchronized, as the current density increases. In order to investigate a role of water on the respiration, we employed a new method of contrast variation for small-angle neutron scattering (SANS) using deuterium (D2) gas as a fuel. By using D2, we introduce special scattering contrast in a polymer electrolyte film (Nafion®), when the film is originally swollen by H2O. After switching from H2 to D2 gas (humidified with H2O), we found that SANS intensity significantly decreases about 40% at the q-position of scattering maximum (qm) originating from the water-microdomains in the polymer electrolyte. After quantitative analyses of the scattering intensity, it was elucidated that 20 wt% of the total water is occupied by D2O as a steady state. At around the average intensity, SANS intensity oscillates with a time interval ∼100sec, which corresponds to the respiration mode found for voltage. The respiration behavior is considered as a non-linear & non-equilibrium phenomenon in an open system, where water flooding plays a role of feedback to decelerate fuel transportation and chemical reaction of water generation.

Item Type: Article
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions: Fakultas Matematika dan Ilmu Pengetahuan Alam > Kimia - S1
Depositing User: Mrs. Wiwi Sartika
Date Deposited: 25 May 2023 12:18
Last Modified: 25 May 2023 12:18
URI: http://repository.unp.ac.id/id/eprint/43979

Actions (login required)

View Item View Item