Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Comparison of Measurement Method of Hydrogen Permeability in Proton Exchange Membrane Fuel Cell

고분자전해질연료전지에서 수소투과도 측정법의 비교

  • Oh, So-Hydong (Department of Chemical Engineering, Sunchon National University) ;
  • Yun, Jeawon (Department of Chemical Engineering, Sunchon National University) ;
  • Lee, Daewoong (Department of Chemical Engineering, Sunchon National University) ;
  • Park, Kwonpil (Department of Chemical Engineering, Sunchon National University)
  • Received : 2019.02.27
  • Accepted : 2019.04.16
  • Published : 2019.08.01
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Abstract

Hydrogen permeability is widely used to evaluate the polymer membrane durability of polymer electrolyte fuel cells (PEMFC). Linear sweep voltammetry (LSV) is mainly used to measure hydrogen permeability easily. There are many differences in LSV measurement method among researchers, and it is often difficult to compare the results. Therefore, in this study, we tried to confirm the accuracy by comparing the hydrogen permeability of LSV method and gas chromatograph which is difficult to measure but accurate value. The LSV method used the DOE and NEDO methods. When the hydrogen permeability was measured by varying the temperature and the relative humidity, the DOE LSV method showed an accuracy of less than 5% in the error range compared with the GC method. In the NEDO LSV method, the error was reduced when the hydrogen permeation current density was determined at the current value of 0.3 V as the DOE method.

고분자전해질 연료전지(PEMFC)의 고분자막 내구성을 평가하는데 수소투과도가 많이 사용되고 있다. 수소투과도를 쉽게 측정하는 방법으로 선형 주사 전압 측정법(Linear Sweep Voltammetry, LSV)이 주로 사용된다. 연구자마다 LSV 측정 방법에 차이가 있어 연구 결과를 비교하기가 어려울 때가 많다. 그래서 본 연구에서는 측정하기 어렵지만 정확한 값이라고 할 수 있는 기체 크로마토그래프에 의한 수소투과도와 DOE와 NEDO의 LSV 방법을 비교하여 정확성을 확인하고자 하였다. 온도와 상대습도를 변화시키며 수소투과도를 측정해 비교했을 때, DOE LSV 방법이 GC 방법과 비교해 오차 범위 5%이하의 정확성을 보였다. NEDO LSV 방법은 DOE방법과 같이 0.3V의 전류 값으로 수소투과전류밀도를 결정했을 때 오차는 감소하였다.

Keywords

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Fig. 1. Gas chromatograph (a) and calibration curve of hydrogen (b).

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Fig. 2. Hydrogen permeability data by (a) GC (b) LSV by DOE method (c) LSV by NEDO method.

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Fig. 3. Comparison of hydrogen fluxes measured by GC and LSVs (HCCD).

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Fig. 4. Correctness increase of NEDO LSV method by determining HCCD at 0.3 V.

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Fig. 5. Change of hydrogen permeability according to temperature measured by (a) GC (b) DOE LSV.

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Fig. 6. Change of hydrogen permeability coefficient according to temperature variation.

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Fig. 7. Comparison of Arrhenius plots from data measured by GC and LSVs (DOE).

Table 1. Comparison of DOE LSV method and the NEDO LSV method

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Table 2. Comparison of hydrogen flux(mL/min*cm2) measured by GC and LSVs

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