GB/T 20042.5-2024 Proton exchange membrane fuel cell - Part 5: Test method for membrane electrode assembly
1 Scope
This document describes the methods for thickness uniformity test, Pt group metal loading test, polarization curve test, hydrogen crossover current density test and insulation resistance test, electrochemical active surface area test, oxygen reduction reaction activity test, ohmic polarization test, MEA itemized aging test, anodic hydrogen oxidation reaction polarization test, anodic anti voltage reversal test for MEA, impurity tolerance test, and MEA durability test of membrane electrode assemblies (MEAs) in PEMFCs.
This document is applicable to the testing of MEAs in PEMFCs, and may serve as a reference for other polymer electrolyte fuel cells.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 3095-2012 Ambient air quality standards
GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods
GB/T 8979 Pure nitrogen and high purity nitrogen and ultra pure nitrogen
GB/T 14599 Pure oxygen and high purity oxygen and ultra pure oxygen
GB/T 28817-2022 Single cell test methods for polymer electrolyte fuel cell (PEFC)
GB/T 31886.1-2015 Test method about the influence of gaseous contaminants in reaction gas on the performance of proton exchange membrane fuel cells - Part 1: Gaseous contaminants in air
GB/T 31886.2-2015 Test method about the influence of gaseous contaminants in reaction gas on the performance of proton exchange membrane fuel cells - Part 2: Gaseous contaminants in hydrogen
GB/T 34872-2017 Technical requirements of hydrogen supply system for proton exchange membrane fuel cells
For the purposes of this document, the terms and definitions given in GB/T 20042.1-2017 and GB/T 28816-2020 as well as the following apply.
3.1
Pt group metal loading
mass of Pt group metals per unit active area of a fuel cell (electrode)
Note 1: This refers to the loading of Pt group metals on the anode or cathode alone, or the total loading on both the anode and cathode;
Note 2: Pt group metals include elements such as platinum (Pt), palladium (Pd), osmium (Os), iridium (Ir), ruthenium (Ru), and rhodium (Rh).
3.2
electrochemical active surface area; ECSA
surface area of the Pt group metal catalyst in a MEA that participates in electrochemical reactions per unit mass, measured using electrochemical methods
Note: The ECSA of a MEA is related to factors such as the electrocatalyst activity and electrode structure of PEMFCs.
[Source: GB/T 20042.1-2017, 3.1.6, modified]
3.3
gasket
component designed to create a seal by compressive deforming under applied pressing force
3.4
rated current density
Ie
quotient of the maximum current specified by the manufacturer for continuous operation of a MEA divided by the effective area
3.5
decay ratio
ratio of the change in a measurable characteristic parameter of a MEA after a certain period of operation to its initial value
3.6
voltage reversal
phenomenon in which the potential of the anode is higher than that of the cathode during fuel cell operation
Foreword II Introduction IV 1 Scope 2 Normative references 3 Terms and definitions 4 General rules 5 Thickness test 6 Pt group metal loading test 7 Polarization curve test 8 Hydrogen crossover current density test and insulation resistance test 9 Electrochemical active surface area test 10 Cathodic oxygen reduction reaction (ORR) activity test 11 Ohmic polarization test 12 MEA itemized aging test 13 Anode Hydrogen Oxidation Reaction (HOR) polarization test 14 Anodic anti voltage reversal test for MEA 15 Gas impurity tolerance test 16 MEA durability test Annex A (Informative) PEMFC test apparatus Annex B (Informative) Assembly relationship of single cell components Annex C (Informative) Flow field plate Annex D (Informative) Reference operating conditions for single cell polarization curve test of MEA Annex E (Informative) Dynamic operating conditions for MEA durability evaluation Bibliography
