| IMPROVEMENT OF FUEL CELL DURABILITY PERFORMANCE
BY AVOIDING HIGH VOLTAGE |
| Seungki Yang, Sungbum Choi, Youngmin Kim, Jongjin Yoon, SeJoon Im, Hyunsuk Choo |
| Hyundai Motor Company |
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| ABSTRACT |
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In order to increase the durability of fuel cell stack, various operating technologies such as voltage cut-off and
lean air operation was verified. With an application of upper voltage cut-off, cell performance loss was effectively diminished,
which suggests that a formation of surface oxide layer on Pt was suppressed resulting in less irreversible catalyst deterioration
such as Pt dissolution. In addition, it was found that voltage sweeping to lower reductive potential with a lean air supply was
beneficial in preventing a power loss. With a simulated vehicle driving mode, it was confirmed that performance durability
was 3 times improved with an application of both voltage cut-off and lean air supply which might be ascribed to the
maintaining the electrochemical acive area of Pt catalyst. The suggested operating conditions based on Pt degradation
mechanism will contribute the durability enhancement of fuel cell stack for FCEVs. |
| Key Words:
Fuel cell, Voltage cut-off, Lean air operation, Durability, Performance |
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Corresponding Author.
Seungki Yang , Email. 
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